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#+TITLE: Determination of the optimal nano-hexapod's stiffness
:DRAWER:
#+STARTUP: overview
#+LANGUAGE: en
#+EMAIL: dehaeze.thomas@gmail.com
#+AUTHOR: Dehaeze Thomas
#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="./css/htmlize.css"/>
#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="./css/readtheorg.css"/>
#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="./css/zenburn.css"/>
#+HTML_HEAD: <script type="text/javascript" src="./js/jquery.min.js"></script>
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#+HTML_HEAD: <script type="text/javascript" src="./js/readtheorg.js"></script>
#+HTML_MATHJAX: align: center tagside: right font: TeX
#+PROPERTY: header-args:matlab :session *MATLAB*
#+PROPERTY: header-args:matlab+ :comments org
#+PROPERTY: header-args:matlab+ :results none
#+PROPERTY: header-args:matlab+ :exports both
#+PROPERTY: header-args:matlab+ :eval no-export
#+PROPERTY: header-args:matlab+ :output-dir figs
#+PROPERTY: header-args:matlab+ :tangle ../matlab/optimal_stiffness.m
#+PROPERTY: header-args:matlab+ :mkdirp yes
#+PROPERTY: header-args:shell :eval no-export
#+PROPERTY: header-args:latex :headers '("\\usepackage{tikz}" "\\usepackage{import}" "\\import{$HOME/Cloud/thesis/latex/org/}{config.tex}")
#+PROPERTY: header-args:latex+ :imagemagick t :fit yes
#+PROPERTY: header-args:latex+ :iminoptions -scale 100% -density 150
#+PROPERTY: header-args:latex+ :imoutoptions -quality 100
#+PROPERTY: header-args:latex+ :results raw replace :buffer no
#+PROPERTY: header-args:latex+ :eval no-export
#+PROPERTY: header-args:latex+ :exports both
#+PROPERTY: header-args:latex+ :mkdirp yes
#+PROPERTY: header-args:latex+ :output-dir figs
:END:
* Introduction :ignore:
As shown before, many parameters other than the nano-hexapod itself do influence the plant dynamics:
- The micro-station compliance (studied [[file:uncertainty_support.org][here]])
- The payload mass and dynamical properties (studied [[file:uncertainty_payload.org][here]] and [[file:uncertainty_experiment.org][here]])
- The experimental conditions, mainly the spindle rotation speed (studied [[file:uncertainty_experiment.org][here]])
As seen before, the stiffness of the nano-hexapod greatly influence the effect of such parameters.
We wish here to see if we can determine an optimal stiffness of the nano-hexapod such that:
- Section [[sec:spindle_rotation_speed]]: the change of its dynamics due to the spindle rotation speed is acceptable
- Section [[sec:micro_station_compliance]]: the support compliance dynamics is not much present in the nano-hexapod dynamics
- Section [[sec:payload_impedance]]: the change of payload impedance has acceptable effect on the plant dynamics
The overall goal is to design a nano-hexapod that will allow the highest possible control bandwidth.
* Spindle Rotation Speed
<<sec:spindle_rotation_speed>>
** Introduction :ignore:
In this section, we look at the effect of the spindle rotation speed on the plant dynamics.
The rotation speed will have an effect due to the Coriolis effect.
** Matlab Init :noexport:ignore:
#+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)
<<matlab-dir>>
#+end_src
#+begin_src matlab :exports none :results silent :noweb yes
<<matlab-init>>
#+end_src
#+begin_src matlab :tangle no
simulinkproject('../');
#+end_src
#+begin_src matlab
load('mat/conf_simulink.mat');
open('nass_model.slx')
#+end_src
** Initialization
We initialize all the stages with the default parameters.
#+begin_src matlab
initializeGround();
initializeGranite();
initializeTy();
initializeRy();
initializeRz();
initializeMicroHexapod();
initializeAxisc();
initializeMirror();
#+end_src
We use a sample mass of 10kg.
#+begin_src matlab
initializeSample('mass', 10);
#+end_src
We don't include disturbances in this model as it adds complexity to the simulations and does not alter the obtained dynamics.
We however include gravity.
#+begin_src matlab
initializeSimscapeConfiguration('gravity', true);
initializeDisturbances('enable', false);
initializeLoggingConfiguration('log', 'none');
initializeController();
#+end_src
#+begin_src matlab :exports none
%% Name of the Simulink File
mdl = 'nass_model';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/Controller'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Micro-Station'], 3, 'openoutput', [], 'Dnlm'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Micro-Station'], 3, 'openoutput', [], 'Fnlm'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Tracking Error'], 1, 'openoutput', [], 'En'); io_i = io_i + 1;
#+end_src
** Identification when rotating at maximum speed
We identify the dynamics for the following spindle rotation speeds =Rz_rpm=:
#+begin_src matlab
Rz_rpm = linspace(0, 60, 6);
#+end_src
And for the following nano-hexapod actuator stiffness =Ks=:
#+begin_src matlab
Ks = logspace(3,9,7); % [N/m]
#+end_src
#+begin_src matlab :exports none
Gk_wz_iff = {zeros(length(Ks), length(Rz_rpm))};
Gk_wz_dvf = {zeros(length(Ks), length(Rz_rpm))};
Gk_wz_err = {zeros(length(Ks), length(Rz_rpm))};
#+end_src
#+begin_src matlab :exports none
for i = 1:length(Ks)
for j = 1:length(Rz_rpm)
initializeReferences('Rz_type', 'rotating-not-filtered', ...
'Rz_period', 60/Rz_rpm(j));
initializeNanoHexapod('k', Ks(i));
%% Run the linearization
G = linearize(mdl, io);
G.InputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
G.OutputName = {'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6', ...
'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6', ...
'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'};
Gk_wz_iff(i,j) = {minreal(G({'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Gk_wz_dvf(i,j) = {minreal(G({'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Jinvt = tf(inv(nano_hexapod.J)');
Jinvt.InputName = {'Fx', 'Fy', 'Fz', 'Mx', 'My', 'Mz'};
Jinvt.OutputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
Gk_wz_err(i,j) = {-minreal(G({'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))*Jinvt};
end
end
#+end_src
#+begin_src matlab :exports none
save('mat/optimal_stiffness_Gk_wz.mat', 'Ks', 'Rz_rpm', ...
'Gk_wz_iff', 'Gk_wz_dvf', 'Gk_wz_err');
#+end_src
** Change of dynamics
#+begin_src matlab :exports none
load('mat/optimal_stiffness_Gk_wz.mat');
#+end_src
We plot the change of dynamics due to the change of the spindle rotation speed (from 0rpm to 60rpm):
- Figure [[fig:opt_stiffness_wz_iff]]: from actuator force $\tau$ to force sensor $\tau_m$ (IFF plant)
- Figure [[fig:opt_stiffness_wz_dvf]]: from actuator force $\tau$ to actuator relative displacement $d\mathcal{L}$ (Decentralized positioning plant)
- Figure [[fig:opt_stiffness_wz_fx_dx]]: from force in the task space $\mathcal{F}_x$ to sample displacement $\mathcal{X}_x$ (Centralized positioning plant)
- Figure [[fig:opt_stiffness_wz_coupling]]: from force in the task space $\mathcal{F}_x$ to sample displacement $\mathcal{X}_y$ (coupling of the centralized positioning plant)
#+begin_src matlab :exports none
freqs = logspace(-2, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gk_wz_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [N/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_iff{i,1}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'northeast');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_wz_iff.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_wz_iff
#+caption: Change of dynamics from actuator $\tau$ to actuator force sensor $\tau_m$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_wz_iff.png][png]], [[./figs/opt_stiffness_wz_iff.pdf][pdf]])
[[file:figs/opt_stiffness_wz_iff.png]]
#+begin_src matlab :exports none
freqs = logspace(-2, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gk_wz_dvf{i,j}('Dnlm1', 'Fnl1'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_dvf{i,1}('Dnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_dvf{i,j}('Dnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'northeast');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_wz_dvf.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_wz_dvf
#+caption: Change of dynamics from actuator force $\tau$ to actuator displacement $d\mathcal{L}$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_wz_dvf.png][png]], [[./figs/opt_stiffness_wz_dvf.pdf][pdf]])
[[file:figs/opt_stiffness_wz_dvf.png]]
#+begin_src matlab :exports none
freqs = logspace(-2, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,1}('Ex', 'Fx'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'northeast');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_wz_fx_dx.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_wz_fx_dx
#+caption: Change of dynamics from force $\mathcal{F}_x$ to displacement $\mathcal{X}_x$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_wz_fx_dx.png][png]], [[./figs/opt_stiffness_wz_fx_dx.pdf][pdf]])
[[file:figs/opt_stiffness_wz_fx_dx.png]]
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ey', 'Fx'), freqs, 'Hz'))), '--', ...
'HandleVisibility', 'off');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); xlabel('Frequency [Hz]');
xlim([freqs(1), freqs(end)]);
legend('location', 'southeast');
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_wz_coupling.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_wz_coupling
#+caption: Change of Coupling from force $\mathcal{F}_x$ to displacement $\mathcal{X}_y$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_wz_coupling.png][png]], [[./figs/opt_stiffness_wz_coupling.pdf][pdf]])
[[file:figs/opt_stiffness_wz_coupling.png]]
** Conclusion :ignore:
#+begin_important
The leg stiffness should be at higher than $k_i = 10^4\ [N/m]$ such that the main resonance frequency does not shift too much when rotating.
For the coupling, it is more difficult to conclude about the minimum required leg stiffness.
#+end_important
#+begin_notes
Note that we can use very soft nano-hexapod if we limit the spindle rotating speed.
#+end_notes
* Micro-Station Compliance Effect
<<sec:micro_station_compliance>>
** Introduction :ignore:
- take the 6dof compliance of the micro-station
- simple model + uncertainty
** Matlab Init :noexport:ignore:
#+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)
<<matlab-dir>>
#+end_src
#+begin_src matlab :exports none :results silent :noweb yes
<<matlab-init>>
#+end_src
#+begin_src matlab :tangle no
simulinkproject('../');
#+end_src
#+begin_src matlab
load('mat/conf_simulink.mat');
open('nass_model.slx')
#+end_src
** Identification of the micro-station compliance
We initialize all the stages with the default parameters.
#+begin_src matlab
initializeGround();
initializeGranite();
initializeTy();
initializeRy();
initializeRz();
initializeMicroHexapod('type', 'compliance');
#+end_src
We put nothing on top of the micro-hexapod.
#+begin_src matlab
initializeAxisc('type', 'none');
initializeMirror('type', 'none');
initializeNanoHexapod('type', 'none');
initializeSample('type', 'none');
#+end_src
#+begin_src matlab :exports none
initializeReferences();
initializeDisturbances();
initializeController();
initializeSimscapeConfiguration();
initializeLoggingConfiguration();
#+end_src
And we identify the dynamics from forces/torques applied on the micro-hexapod top platform to the motion of the micro-hexapod top platform at the same point.
#+begin_src matlab :exports none
%% Name of the Simulink File
mdl = 'nass_model';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/Micro-Station/Micro Hexapod/Compliance/Fm'], 1, 'openinput'); io_i = io_i + 1; % Direct Forces/Torques applied on the micro-hexapod top platform
io(io_i) = linio([mdl, '/Micro-Station/Micro Hexapod/Compliance/Dm'], 1, 'output'); io_i = io_i + 1; % Absolute displacement of the top platform
%% Run the linearization
Gm = linearize(mdl, io);
Gm.InputName = {'Fmx', 'Fmy', 'Fmz', 'Mmx', 'Mmy', 'Mmz'};
Gm.OutputName = {'Dx', 'Dy', 'Dz', 'Drx', 'Dry', 'Drz'};
#+end_src
The diagonal element of the identified Micro-Station compliance matrix are shown in Figure [[fig:opt_stiff_micro_station_compliance]].
#+begin_src matlab :exports none
labels = {'$D_x/F_{x}$', '$D_y/F_{y}$', '$D_z/F_{z}$', '$R_{x}/M_{x}$', '$R_{y}/M_{y}$', '$R_{R}/M_{z}$'};
freqs = logspace(1, 3, 1000);
figure;
hold on;
for i = 1:6
plot(freqs, abs(squeeze(freqresp(Gm(i, i), freqs, 'Hz'))), 'DisplayName', labels{i});
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
xlabel('Frequency [Hz]');
ylabel('Compliance');
legend('location', 'northwest');
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiff_micro_station_compliance.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiff_micro_station_compliance
#+caption: Identified Compliance of the Micro-Station ([[./figs/opt_stiff_micro_station_compliance.png][png]], [[./figs/opt_stiff_micro_station_compliance.pdf][pdf]])
[[file:figs/opt_stiff_micro_station_compliance.png]]
** Identification of the dynamics with a rigid micro-station
We now identify the dynamics when the micro-station is rigid.
This is equivalent of identifying the dynamics of the nano-hexapod when fixed to a rigid ground.
#+begin_src matlab :exports none
initializeGround('type', 'rigid');
initializeGranite('type', 'rigid');
initializeTy('type', 'rigid');
initializeRy('type', 'rigid');
initializeRz('type', 'rigid');
initializeMicroHexapod('type', 'rigid');
initializeAxisc('type', 'rigid');
initializeMirror('type', 'rigid');
#+end_src
We also choose the sample to be rigid and to have a mass of 10kg.
#+begin_src matlab
initializeSample('type', 'rigid', 'mass', 10);
#+end_src
#+begin_src matlab :exports none
initializeReferences();
initializeDisturbances();
initializeController();
initializeSimscapeConfiguration();
initializeLoggingConfiguration();
initializeSimscapeConfiguration('gravity', false);
#+end_src
#+begin_src matlab :exports none
%% Name of the Simulink File
mdl = 'nass_model';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/Controller'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Micro-Station'], 3, 'openoutput', [], 'Dnlm'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Micro-Station'], 3, 'openoutput', [], 'Fnlm'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Tracking Error'], 1, 'openoutput', [], 'En'); io_i = io_i + 1;
#+end_src
As before, we identify the dynamics for the following actuator stiffnesses:
#+begin_src matlab
Ks = logspace(3,9,7); % [N/m]
#+end_src
#+begin_src matlab :exports none
Gmr_iff = {zeros(length(Ks))};
Gmr_dvf = {zeros(length(Ks))};
Gmr_err = {zeros(length(Ks))};
#+end_src
#+begin_src matlab :exports none
for i = 1:length(Ks)
initializeNanoHexapod('k', Ks(i));
G = linearize(mdl, io);
G.InputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
G.OutputName = {'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6', ...
'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6', ...
'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'};
Gmr_iff(i) = {minreal(G({'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Gmr_dvf(i) = {minreal(G({'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Jinvt = tf(inv(nano_hexapod.J)');
Jinvt.InputName = {'Fx', 'Fy', 'Fz', 'Mx', 'My', 'Mz'};
Jinvt.OutputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
Gmr_err(i) = {-minreal(G({'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))*Jinvt};
end
#+end_src
** Identification of the dynamics with a flexible micro-station
We now initialize all the micro-station stages to be flexible.
And we identify the dynamics of the nano-hexapod.
#+begin_src matlab :exports none
initializeGround();
initializeGranite();
initializeTy();
initializeRy();
initializeRz();
initializeMicroHexapod();
initializeAxisc();
initializeMirror();
#+end_src
#+begin_src matlab :exports none
Gmf_iff = {zeros(length(Ks))};
Gmf_dvf = {zeros(length(Ks))};
Gmf_err = {zeros(length(Ks))};
#+end_src
#+begin_src matlab :exports none
for i = 1:length(Ks)
initializeNanoHexapod('k', Ks(i));
G = linearize(mdl, io);
G.InputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
G.OutputName = {'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6', ...
'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6', ...
'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'};
Gmf_iff(i) = {minreal(G({'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Gmf_dvf(i) = {minreal(G({'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Jinvt = tf(inv(nano_hexapod.J)');
Jinvt.InputName = {'Fx', 'Fy', 'Fz', 'Mx', 'My', 'Mz'};
Jinvt.OutputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
Gmf_err(i) = {-minreal(G({'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))*Jinvt};
end
#+end_src
#+begin_src matlab :exports none
save('mat/optimal_stiffness_micro_station_compliance.mat', 'Ks', ...
'Gmr_iff', 'Gmr_dvf', 'Gmr_err', ...
'Gmf_iff', 'Gmf_dvf', 'Gmf_err');
#+end_src
** Obtained Dynamics
#+begin_src matlab :exports none
load('mat/optimal_stiffness_micro_station_compliance.mat');
#+end_src
We plot the change of dynamics due to the compliance of the Micro-Station.
The solid curves are corresponding to the nano-hexapod without the micro-station, and the dashed curves with the micro-station:
- Figure [[fig:opt_stiffness_micro_station_iff]]: from actuator force $\tau$ to force sensor $\tau_m$ (IFF plant)
- Figure [[fig:opt_stiffness_micro_station_dvf]]: from actuator force $\tau$ to actuator relative displacement $d\mathcal{L}$ (Decentralized positioning plant)
- Figure [[fig:opt_stiffness_micro_station_fx_dx]]: from force in the task space $\mathcal{F}_x$ to sample displacement $\mathcal{X}_x$ (Centralized positioning plant)
- Figure [[fig:opt_stiffness_micro_station_fz_dz]]: from force in the task space $\mathcal{F}_z$ to sample displacement $\mathcal{X}_z$ (Centralized positioning plant)
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmr_iff{i}('Fnlm1', 'Fnl1'), freqs, 'Hz'))), '-');
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmf_iff{i}('Fnlm1', 'Fnl1'), freqs, 'Hz'))), '--');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [N/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_iff{i}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_iff{i}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '--', ...
'HandleVisibility', 'off');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_micro_station_iff.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_micro_station_iff
#+caption: Change of dynamics from actuator $\tau$ to actuator force sensor $\tau_m$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_iff.png][png]], [[./figs/opt_stiffness_micro_station_iff.pdf][pdf]])
[[file:figs/opt_stiffness_micro_station_iff.png]]
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmr_dvf{i}('Dnlm1', 'Fnl1'), freqs, 'Hz'))), '-');
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmf_dvf{i}('Dnlm1', 'Fnl1'), freqs, 'Hz'))), '--');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [N/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_dvf{i}('Dnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_dvf{i}('Dnlm1', 'Fnl1'), freqs, 'Hz')))), '--', ...
'HandleVisibility', 'off');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_micro_station_dvf.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_micro_station_dvf
#+caption: Change of dynamics from actuator force $\tau$ to actuator displacement $d\mathcal{L}$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_dvf.png][png]], [[./figs/opt_stiffness_micro_station_dvf.pdf][pdf]])
[[file:figs/opt_stiffness_micro_station_dvf.png]]
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-');
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '--');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '--', ...
'HandleVisibility', 'off');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_micro_station_fx_dx.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_micro_station_fx_dx
#+caption: Change of dynamics from force $\mathcal{F}_x$ to displacement $\mathcal{X}_x$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_fx_dx.png][png]], [[./figs/opt_stiffness_micro_station_fx_dx.pdf][pdf]])
[[file:figs/opt_stiffness_micro_station_fx_dx.png]]
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ez', 'Fz'), freqs, 'Hz'))), '-');
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ez', 'Fz'), freqs, 'Hz'))), '--');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$k = %.0g$ [N/m]', Ks(i)));
set(gca,'ColorOrderIndex',i);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ez', 'Fz'), freqs, 'Hz')))), '--', ...
'HandleVisibility', 'off');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_micro_station_fz_dz.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_micro_station_fz_dz
#+caption: Change of dynamics from force $\mathcal{F}_z$ to displacement $\mathcal{X}_z$ for a spindle rotation speed from 0rpm to 60rpm ([[./figs/opt_stiffness_micro_station_fz_dz.png][png]], [[./figs/opt_stiffness_micro_station_fz_dz.pdf][pdf]])
[[file:figs/opt_stiffness_micro_station_fz_dz.png]]
** Conclusion :ignore:
#+begin_important
The dynamics of the nano-hexapod is not affected by the micro-station dynamics (compliance) when the stiffness of the legs is less than $10^6\ [N/m]$.
When the nano-hexapod is stiff ($k>10^7\ [N/m]$), the compliance of the micro-station appears in the primary plant.
#+end_important
* Payload "Impedance" Effect
<<sec:payload_impedance>>
** Introduction :ignore:
** Matlab Init :noexport:ignore:
#+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)
<<matlab-dir>>
#+end_src
#+begin_src matlab :exports none :results silent :noweb yes
<<matlab-init>>
#+end_src
#+begin_src matlab :tangle no
simulinkproject('../');
#+end_src
#+begin_src matlab
load('mat/conf_simulink.mat');
open('nass_model.slx')
#+end_src
** Initialization
We initialize all the stages with the default parameters.
#+begin_src matlab :exports none
initializeGround();
initializeGranite();
initializeTy();
initializeRy();
initializeRz();
initializeMicroHexapod();
initializeAxisc();
initializeMirror();
#+end_src
We don't include disturbances in this model as it adds complexity to the simulations and does not alter the obtained dynamics. :exports none
#+begin_src matlab
initializeDisturbances('enable', false);
#+end_src
We set the controller type to Open-Loop, and we do not need to log any signal.
#+begin_src matlab
initializeSimscapeConfiguration('gravity', true);
initializeController();
initializeLoggingConfiguration('log', 'none');
initializeReferences();
#+end_src
#+begin_src matlab :exports none
%% Name of the Simulink File
mdl = 'nass_model';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/Controller'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Micro-Station'], 3, 'openoutput', [], 'Dnlm'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Micro-Station'], 3, 'openoutput', [], 'Fnlm'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Tracking Error'], 1, 'openoutput', [], 'En'); io_i = io_i + 1;
#+end_src
** Identification of the dynamics while change the payload dynamics
We make the following change of payload dynamics:
- Change of mass: from 1kg to 50kg
- Change of resonance frequency: from 50Hz to 500Hz
- The damping ratio of the payload is fixed to $\xi = 0.2$
We identify the dynamics for the following payload masses =Ms= and nano-hexapod leg's stiffnesses =Ks=:
#+begin_src matlab
Ms = [1, 20, 50]; % [Kg]
Ks = logspace(3,9,7); % [N/m]
#+end_src
#+begin_src matlab :exports none
Gm_iff = {zeros(length(Ks), length(Ms))};
Gm_dvf = {zeros(length(Ks), length(Ms))};
Gm_err = {zeros(length(Ks), length(Ms))};
#+end_src
#+begin_src matlab :exports none
for i = 1:length(Ks)
for j = 1:length(Ms)
initializeNanoHexapod('k', Ks(i));
initializeSample('mass', Ms(j), 'freq', 100*ones(6,1));
G = linearize(mdl, io);
G.InputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
G.OutputName = {'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6', ...
'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6', ...
'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'};
Gm_iff(i,j) = {minreal(G({'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Gm_dvf(i,j) = {minreal(G({'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Jinvt = tf(inv(nano_hexapod.J)');
Jinvt.InputName = {'Fx', 'Fy', 'Fz', 'Mx', 'My', 'Mz'};
Jinvt.OutputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
Gm_err(i,j) = {-minreal(G({'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))*Jinvt};
end
end
#+end_src
We then identify the dynamics for the following payload resonance frequencies =Fs=:
#+begin_src matlab
Fs = [50, 200, 500]; % [Hz]
#+end_src
#+begin_src matlab :exports none
Gf_iff = {zeros(length(Ks), length(Fs))};
Gf_dvf = {zeros(length(Ks), length(Fs))};
Gf_err = {zeros(length(Ks), length(Fs))};
#+end_src
#+begin_src matlab :exports none
for i = 1:length(Ks)
for j = 1:length(Fs)
initializeNanoHexapod('k', Ks(i));
initializeSample('mass', 10, 'freq', Fs(j)*ones(6,1));
G = linearize(mdl, io);
G.InputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
G.OutputName = {'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6', ...
'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6', ...
'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'};
Gf_iff(i,j) = {minreal(G({'Fnlm1', 'Fnlm2', 'Fnlm3', 'Fnlm4', 'Fnlm5', 'Fnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Gf_dvf(i,j) = {minreal(G({'Dnlm1', 'Dnlm2', 'Dnlm3', 'Dnlm4', 'Dnlm5', 'Dnlm6'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))};
Jinvt = tf(inv(nano_hexapod.J)');
Jinvt.InputName = {'Fx', 'Fy', 'Fz', 'Mx', 'My', 'Mz'};
Jinvt.OutputName = {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'};
Gf_err(i,j) = {-minreal(G({'Ex', 'Ey', 'Ez', 'Erx', 'Ery', 'Erz'}, {'Fnl1', 'Fnl2', 'Fnl3', 'Fnl4', 'Fnl5', 'Fnl6'}))*Jinvt};
end
end
#+end_src
#+begin_src matlab :exports none
save('mat/optimal_stiffness_Gm_Gf.mat', 'Ks', 'Ms', 'Fs', ...
'Gm_iff', 'Gm_dvf', 'Gm_err', ...
'Gf_iff', 'Gf_dvf', 'Gf_err');
#+end_src
** TODO Change of optimal gain for decentralized control :noexport:
For each payload, compute the optimal gain for the IFF control.
The optimal value corresponds to critical damping to *all* the 6 modes of the nano-hexapod.
#+begin_src matlab :exports none
load('mat/optimal_stiffness_Gm_Gf.mat');
#+end_src
Change of Mass
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gm_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',i);
if j == 1
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$K = %.0e$ [N/m]', Ks(i)));
else
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'northeast');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
Optimal gains:
#+begin_src matlab
opt_gains = [20 60 200 600 2000 6000 20000];
#+end_src
Change of poles with mass
#+begin_src matlab :exports none
i = 7;
figure;
hold on;
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',j);
cl_poles = pole(feedback(Gm_iff{i,j}, (-gains(k)/s)*eye(6)));
plot(real(cl_poles), imag(cl_poles), '.');
end
#+end_src
#+begin_src matlab :exports none
i = 4;
gains = logspace(1, 3, 500);
figure;
hold on;
for j = 1:length(Ms)
for k = 1:length(gains)
set(gca,'ColorOrderIndex',j);
cl_poles = pole(feedback(Gm_iff{i,j}, (-gains(k)/s)*eye(6)));
poles_damp = phase(cl_poles(imag(cl_poles)>0)) - pi/2;
plot(gains(k)*ones(size(poles_damp)), poles_damp, '.');
end
end
xlabel('Control Gain');
ylabel('Damping of the Poles');
set(gca, 'XScale', 'log');
ylim([0,pi/2]);
#+end_src
#+begin_src matlab :exports none
i = 7;
gains = logspace(3, 5, 500);
figure;
hold on;
for j = 1:length(Ms)
for k = 1:length(gains)
set(gca,'ColorOrderIndex',j);
cl_poles = pole(feedback(Gm_iff{i,j}, (-gains(k)/s)*eye(6)));
poles_damp = phase(cl_poles(imag(cl_poles)>0)) - pi/2;
plot(gains(k)*ones(size(poles_damp)), poles_damp, '.');
end
end
xlabel('Control Gain');
ylabel('Damping of the Poles');
set(gca, 'XScale', 'log');
ylim([0,pi/2]);
#+end_src
Change of payload resonance frequency
#+begin_src matlab :exports none
i = 1;
gains = logspace(0, 2, 100);
figure;
hold on;
for j = 1:length(Fs)
for k = 1:length(gains)
set(gca,'ColorOrderIndex',j);
cl_poles = pole(feedback(Gf_iff{i,j}, (-gains(k)/s)*eye(6)));
poles_damp = phase(cl_poles(imag(cl_poles)>0)) - pi/2;
plot(gains(k)*ones(size(poles_damp)), poles_damp, '.');
end
end
xlabel('Control Gain');
ylabel('Damping of the Poles');
set(gca, 'XScale', 'log');
ylim([0,pi/2]);
#+end_src
#+begin_src matlab :exports none
i = 7;
gains = logspace(3, 5, 100);
figure;
hold on;
for j = 1:length(Fs)
for k = 1:length(gains)
set(gca,'ColorOrderIndex',j);
cl_poles = pole(feedback(Gf_iff{i,j}, (-gains(k)/s)*eye(6)));
poles_damp = phase(cl_poles(imag(cl_poles)>0)) - pi/2;
plot(gains(k)*ones(size(poles_damp)), poles_damp, '.');
end
end
xlabel('Control Gain');
ylabel('Damping of the Poles');
set(gca, 'XScale', 'log');
ylim([0,pi/2]);
#+end_src
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gf_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',i);
if j == 1
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$K = %.0e$ [N/m]', Ks(i)));
else
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_iff{i,j}('Fnlm1', 'Fnl1'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
** Change of dynamics for the primary controller
#+begin_src matlab :exports none
load('mat/optimal_stiffness_Gm_Gf.mat');
#+end_src
*** Frequency variation
We here compare the dynamics for the same payload mass, but different stiffness resulting in different resonance frequency of the payload:
- Figure [[fig:opt_stiffness_payload_freq_fz_dz]]: dynamics from a force $\mathcal{F}_z$ applied in the task space in the vertical direction to the vertical displacement of the sample $\mathcal{X}_z$ for both a very soft and a very stiff nano-hexapod.
- Figure [[fig:opt_stiffness_payload_freq_all]]: same, but for all tested nano-hexapod stiffnesses
We can see two mass lines for the soft nano-hexapod (Figure [[fig:opt_stiffness_payload_freq_fz_dz]]):
- The first mass line corresponds to $\frac{1}{(m_n + m_p)s^2}$ where $m_p = 10\ [kg]$ is the mass of the payload and $m_n = 15\ [Kg]$ is the mass of the nano-hexapod top platform and attached mirror
- The second mass line corresponds to $\frac{1}{m_n s^2}$
- The zero corresponds to the resonance of the payload alone (fixed nano-hexapod's top platform)
#+begin_src matlab :exports none
i = 1;
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 2, 1);
hold on;
for j = 1:length(Fs)
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz'))), '-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 2, 3);
hold on;
for j = 1:length(Fs)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$\\omega_0 = %.0f$ [Hz]', Fs(j)));
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
i = 7;
ax1 = subplot(2, 2, 2);
hold on;
for j = 1:length(Fs)
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz'))), '-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 2, 4);
hold on;
for j = 1:length(Fs)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$\\omega_0 = %.0f$ [Hz]', Fs(j)));
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_payload_freq_fz_dz.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_payload_freq_fz_dz
#+caption: Dynamics from $\mathcal{F}_z$ to $\mathcal{X}_z$ for varying payload resonance frequency, both for a soft nano-hexapod and a stiff nano-hexapod ([[./figs/opt_stiffness_payload_freq_fz_dz.png][png]], [[./figs/opt_stiffness_payload_freq_fz_dz.pdf][pdf]])
[[file:figs/opt_stiffness_payload_freq_fz_dz.png]]
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',i);
if j == 1
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$K = %.0e$ [N/m]', Ks(i)));
else
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_payload_freq_all.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_payload_freq_all
#+caption: Dynamics from $\mathcal{F}_z$ to $\mathcal{X}_z$ for varying payload resonance frequency ([[./figs/opt_stiffness_payload_freq_all.png][png]], [[./figs/opt_stiffness_payload_freq_all.pdf][pdf]])
[[file:figs/opt_stiffness_payload_freq_all.png]]
*** Mass variation
We here compare the dynamics for different payload mass with the same resonance frequency (100Hz):
- Figure [[fig:opt_stiffness_payload_mass_fz_dz]]: dynamics from a force $\mathcal{F}_z$ applied in the task space in the vertical direction to the vertical displacement of the sample $\mathcal{X}_z$ for both a very soft and a very stiff nano-hexapod.
- Figure [[fig:opt_stiffness_payload_mass_all]]: same, but for all tested nano-hexapod stiffnesses
We can see here that for the soft nano-hexapod:
- the first resonance $\omega_n$ is changing with the mass of the payload as $\omega_n = \sqrt{\frac{k_n}{m_p + m_n}}$ with $k_p$ the stiffness of the nano-hexapod, $m_p$ the payload's mass and $m_n$ the mass of the nano-hexapod top platform
- the first mass line corresponding to $\frac{1}{(m_p + m_n)s^2}$ is changing with the payload mass
- the zero at 100Hz is not changing as it corresponds to the resonance of the payload itself
- the second mass line does not change
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
i = 1;
ax1 = subplot(2, 2, 1);
hold on;
for j = 1:length(Ms)
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz'))), '-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 2, 3);
hold on;
for j = 1:length(Ms)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
i = 7;
ax1 = subplot(2, 2, 2);
hold on;
for j = 1:length(Ms)
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz'))), '-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 2, 4);
hold on;
for j = 1:length(Ms)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$m_p = %.0f$ [kg]', Ms(j)));
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_payload_mass_fz_dz.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_payload_mass_fz_dz
#+caption: Dynamics from $\mathcal{F}_z$ to $\mathcal{X}_z$ for varying payload mass, both for a soft nano-hexapod and a stiff nano-hexapod ([[./figs/opt_stiffness_payload_mass_fz_dz.png][png]], [[./figs/opt_stiffness_payload_mass_fz_dz.pdf][pdf]])
[[file:figs/opt_stiffness_payload_mass_fz_dz.png]]
#+begin_src matlab :exports none
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
for i = 1:length(Ks)
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',i);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz'))), '-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ax2 = subplot(2, 1, 2);
hold on;
for i = 1:length(Ks)
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',i);
if j == 1
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'DisplayName', sprintf('$K = %.0e$ [N/m]', Ks(i)));
else
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ez', 'Fz'), freqs, 'Hz')))), '-', ...
'HandleVisibility', 'off');
end
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
legend('location', 'southwest');
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_payload_mass_all.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_payload_mass_all
#+caption: Dynamics from $\mathcal{F}_z$ to $\mathcal{X}_z$ for varying payload mass ([[./figs/opt_stiffness_payload_mass_all.png][png]], [[./figs/opt_stiffness_payload_mass_all.pdf][pdf]])
[[file:figs/opt_stiffness_payload_mass_all.png]]
*** Total variation
We now plot the total change of dynamics due to change of the payload (Figure [[fig:opt_stiffness_payload_impedance_fz_dz]]):
- mass from 1kg to 50kg
- main resonance from 50Hz to 500Hz
#+begin_src matlab :exports none
i = 1;
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 2, 1);
hold on;
for j = 1:length(Fs)
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
for j = 1:length(Ms)
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 2, 3);
hold on;
for j = 1:length(Fs)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
for j = 1:length(Ms)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
i = 7;
ax1 = subplot(2, 2, 2);
hold on;
for j = 1:length(Fs)
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
for j = 1:length(Ms)
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 2, 4);
hold on;
for j = 1:length(Fs)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
for j = 1:length(Ms)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
end
end
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_payload_impedance_fz_dz.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_payload_impedance_fz_dz
#+caption: Dynamics from $\mathcal{F}_z$ to $\mathcal{X}_z$ for varying payload dynamics, both for a soft nano-hexapod and a stiff nano-hexapod ([[./figs/opt_stiffness_payload_impedance_fz_dz.png][png]], [[./figs/opt_stiffness_payload_impedance_fz_dz.pdf][pdf]])
[[file:figs/opt_stiffness_payload_impedance_fz_dz.png]]
** Conclusion :ignore:
#+begin_important
#+end_important
* Total Change of dynamics
#+begin_src matlab :exports none
load('mat/optimal_stiffness_Gm_Gf.mat');
load('mat/optimal_stiffness_micro_station_compliance.mat');
load('mat/optimal_stiffness_Gk_wz.mat');
#+end_src
We now consider the total change of nano-hexapod dynamics due to:
- =Gk_wz_err= - Change of spindle rotation speed
- =Gf_err= and =Gm_err= - Change of payload resonance
- =Gmf_err= and =Gmr_err= - Micro-Station compliance
The obtained dynamics are shown:
- Figure [[fig:opt_stiffness_plant_dynamics_fx_dx_k_1e3]] for a stiffness $k = 10^3\ [N/m]$
- Figure [[fig:opt_stiffness_plant_dynamics_fx_dx_k_1e5]] for a stiffness $k = 10^5\ [N/m]$
- Figure [[fig:opt_stiffness_plant_dynamics_fx_dx_k_1e7]] for a stiffness $k = 10^7\ [N/m]$
- Figure [[fig:opt_stiffness_plant_dynamics_fx_dx_k_1e9]] for a stiffness $k = 10^9\ [N/m]$
And finally, in Figures [[fig:opt_stiffness_plant_dynamics_task_space]] and [[fig:opt_stiffness_plant_dynamics_task_space_colors]] are shown an animation of the change of dynamics with the nano-hexapod's stiffness.
#+begin_src matlab :exports none
i = 1;
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
% =Gf_err= - Change of payload resonance
plot(freqs, abs(squeeze(freqresp(Gf_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Freq');
for j = 2:length(Fs)
set(gca,'ColorOrderIndex',1);
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Mass');
for j = 2:length(Ms)
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rotationg Speed');
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rigid $\mu$-station');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Flexible $\mu$-station');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
legend('location', 'southwest');
ax2 = subplot(2, 1, 2);
hold on;
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',1);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',2);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
% =Gm_err= - Change of payload mass
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',3);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_plant_dynamics_fx_dx_k_1e3.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_plant_dynamics_fx_dx_k_1e3
#+caption: Total variation of the dynamics from $\mathcal{F}_x$ to $\mathcal{X}_x$. Nano-hexapod leg's stiffness is equal to $k = 10^3\ [N/m]$ ([[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e3.png][png]], [[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e3.pdf][pdf]])
[[file:figs/opt_stiffness_plant_dynamics_fx_dx_k_1e3.png]]
#+begin_src matlab :exports none
i = 3;
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
% =Gf_err= - Change of payload resonance
plot(freqs, abs(squeeze(freqresp(Gf_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Freq');
for j = 2:length(Fs)
set(gca,'ColorOrderIndex',1);
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Mass');
for j = 2:length(Ms)
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rotationg Speed');
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rigid $\mu$-station');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Flexible $\mu$-station');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
legend('location', 'southwest');
ax2 = subplot(2, 1, 2);
hold on;
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',1);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',2);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
% =Gm_err= - Change of payload mass
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',3);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_plant_dynamics_fx_dx_k_1e5.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_plant_dynamics_fx_dx_k_1e5
#+caption: Total variation of the dynamics from $\mathcal{F}_x$ to $\mathcal{X}_x$. Nano-hexapod leg's stiffness is equal to $k = 10^5\ [N/m]$ ([[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e5.png][png]], [[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e5.pdf][pdf]])
[[file:figs/opt_stiffness_plant_dynamics_fx_dx_k_1e5.png]]
#+begin_src matlab :exports none
i = 5;
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
% =Gf_err= - Change of payload resonance
plot(freqs, abs(squeeze(freqresp(Gf_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Freq');
for j = 2:length(Fs)
set(gca,'ColorOrderIndex',1);
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Mass');
for j = 2:length(Ms)
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rotationg Speed');
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rigid $\mu$-station');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Flexible $\mu$-station');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
legend('location', 'southwest');
ax2 = subplot(2, 1, 2);
hold on;
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',1);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',2);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
% =Gm_err= - Change of payload mass
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',3);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_plant_dynamics_fx_dx_k_1e7.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_plant_dynamics_fx_dx_k_1e7
#+caption: Total variation of the dynamics from $\mathcal{F}_x$ to $\mathcal{X}_x$. Nano-hexapod leg's stiffness is equal to $k = 10^7\ [N/m]$ ([[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e7.png][png]], [[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e7.pdf][pdf]])
[[file:figs/opt_stiffness_plant_dynamics_fx_dx_k_1e7.png]]
#+begin_src matlab :exports none
i = 7;
freqs = logspace(-1, 3, 1000);
figure;
ax1 = subplot(2, 1, 1);
hold on;
% =Gf_err= - Change of payload resonance
plot(freqs, abs(squeeze(freqresp(Gf_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Freq');
for j = 2:length(Fs)
set(gca,'ColorOrderIndex',1);
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Payload Mass');
for j = 2:length(Ms)
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
% =Gm_err= - Change of payload mass
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,1}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rotationg Speed');
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'HandleVisibility', 'off');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Rigid $\mu$-station');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-', ...
'DisplayName', 'Flexible $\mu$-station');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
legend('location', 'southwest');
ax2 = subplot(2, 1, 2);
hold on;
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',1);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',2);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
% =Gm_err= - Change of payload mass
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',3);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
set(gca,'ColorOrderIndex',4);
% =Gmr_err= - Rigid Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
% =Gmf_err= - Flexible Micro-Station
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
#+end_src
#+header: :tangle no :exports results :results none :noweb yes
#+begin_src matlab :var filepath="figs/opt_stiffness_plant_dynamics_fx_dx_k_1e9.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
<<plt-matlab>>
#+end_src
#+name: fig:opt_stiffness_plant_dynamics_fx_dx_k_1e9
#+caption: Total variation of the dynamics from $\mathcal{F}_x$ to $\mathcal{X}_x$. Nano-hexapod leg's stiffness is equal to $k = 10^9\ [N/m]$ ([[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e9.png][png]], [[./figs/opt_stiffness_plant_dynamics_fx_dx_k_1e9.pdf][pdf]])
[[file:figs/opt_stiffness_plant_dynamics_fx_dx_k_1e9.png]]
#+NAME: fig:opt_stiffness_plant_dynamics_task_space
#+HEADER: :tangle no :exports results :results value file raw replace :noweb yes
#+begin_src matlab
h = figure;
filename = 'figs/opt_stiffness_plant_dynamics_task_space.gif';
for i = 1:length(Ks)
clf(h)
ax1 = subplot(2, 1, 1);
hold on;
for j = 1:length(Fs)
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
for j = 1:length(Ms)
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
for j = 1:length(Rz_rpm)
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
end
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), 'k-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ylim([1e-10, 1e-1]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 1, 2);
hold on;
for j = 1:length(Rz_rpm)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
end
for j = 1:length(Fs)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
end
for j = 1:length(Ms)
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
end
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), 'k-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
set(h, 'visible', 'off');
set(h, 'pos', [0, 0, 1200, 800]);
drawnow;
% Capture the plot as an image
frame = getframe(h);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
% Write to the GIF File
if i == 1
imwrite(imind,cm,filename,'gif','DelayTime',1.0,'Loopcount',inf);
else
imwrite(imind,cm,filename,'gif','DelayTime',1.0,'WriteMode','append');
end
end
set(h, 'visible', 'on');
ans = filename;
#+end_src
#+NAME: fig:opt_stiffness_plant_dynamics_task_space
#+CAPTION: Variability of the dynamics from $\mathcal{F}_x$ to $\mathcal{X}_x$ with varying nano-hexapod stiffness
#+RESULTS: fig:opt_stiffness_plant_dynamics_task_space
[[file:figs/opt_stiffness_plant_dynamics_task_space.gif]]
#+NAME: fig:opt_stiffness_plant_dynamics_task_space_colors
#+HEADER: :tangle no :exports results :results value file raw replace :noweb yes
#+begin_src matlab
h = figure;
filename = 'figs/opt_stiffness_plant_dynamics_task_space_colors.gif';
for i = 1:length(Ks)
clf(h)
ax1 = subplot(2, 1, 1);
hold on;
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',1);
plot(freqs, abs(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-');
end
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',2);
plot(freqs, abs(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-');
end
for j = 2:length(Rz_rpm)
set(gca,'ColorOrderIndex',3);
plot(freqs, abs(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz'))), '-');
end
set(gca,'ColorOrderIndex',4);
plot(freqs, abs(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-');
plot(freqs, abs(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz'))), '-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
ylabel('Amplitude [m/N]'); set(gca, 'XTickLabel',[]);
ylim([1e-10, 1e-1]);
title(sprintf('$k = %.0e$ [N/m]', Ks(i)))
ax2 = subplot(2, 1, 2);
hold on;
for j = 1:length(Rz_rpm)
set(gca,'ColorOrderIndex',1);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gk_wz_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
for j = 1:length(Fs)
set(gca,'ColorOrderIndex',2);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gf_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
for j = 1:length(Ms)
set(gca,'ColorOrderIndex',3);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gm_err{i,j}('Ex', 'Fx'), freqs, 'Hz')))), '-');
end
set(gca,'ColorOrderIndex',4);
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmr_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
plot(freqs, 180/pi*unwrap(angle(squeeze(freqresp(Gmf_err{i}('Ex', 'Fx'), freqs, 'Hz')))), '-');
hold off;
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'lin');
ylabel('Phase [deg]'); xlabel('Frequency [Hz]');
ylim([-270, 90]);
yticks([-360:90:360]);
linkaxes([ax1,ax2],'x');
xlim([freqs(1), freqs(end)]);
set(h, 'visible', 'off');
set(h, 'pos', [0, 0, 1200, 800]);
drawnow;
% Capture the plot as an image
frame = getframe(h);
im = frame2im(frame);
[imind,cm] = rgb2ind(im,256);
% Write to the GIF File
if i == 1
imwrite(imind,cm,filename,'gif','DelayTime',1.0,'Loopcount',inf);
else
imwrite(imind,cm,filename,'gif','DelayTime',1.0,'WriteMode','append');
end
end
set(h, 'visible', 'on');
ans = filename;
#+end_src
#+NAME: fig:opt_stiffness_plant_dynamics_task_space_colors
#+CAPTION: Variability of the dynamics from $\mathcal{F}_x$ to $\mathcal{X}_x$ with varying nano-hexapod stiffness
#+RESULTS: fig:opt_stiffness_plant_dynamics_task_space_colors
[[file:figs/opt_stiffness_plant_dynamics_task_space_colors.gif]]
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