Rename all files, tangle Matlab code

This commit is contained in:
Thomas Dehaeze 2024-03-25 10:01:56 +01:00
parent b6ee956cea
commit 27d859df04
105 changed files with 1026 additions and 903 deletions

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@ -0,0 +1,75 @@
%% Clear Workspace and Close figures
clear; close all; clc;
%% Intialize Laplace variable
s = zpk('s');
%% Path for functions, data and scripts
addpath('./mat/'); % Path for data
%% Colors for the figures
colors = colororder;
% Measurement Results
% # - Strange shape: 5
% The expected flexible beam thickness is $250\,\mu m$.
% However, it is more important that the thickness of all beams are close to each other.
% The dimension of the beams are been measured at each end to be able to estimate the mean of the beam thickness.
% All the measured dimensions are summarized in Table ref:tab:test_joints_flex_dim.
meas_flex = [[223, 226, 224, 214];
[229, 231, 237, 224];
[234, 230, 239, 231];
[233, 227, 229, 232];
[225, 212, 228, 228];
[220, 221, 224, 220];
[206, 207, 228, 226];
[230, 224, 224, 223];
[223, 231, 228, 233];
[228, 230, 235, 231];
[197, 207, 211, 204];
[227, 226, 225, 226];
[215, 228, 231, 220];
[216, 224, 224, 221];
[209, 214, 220, 221];
[213, 210, 230, 229]];
% #+name: tab:test_joints_flex_dim
% #+caption: Measured Dimensions of the flexible beams in $\mu m$
% #+attr_latex: :environment tabularx :width 0.4\linewidth :align Xcccc
% #+attr_latex: :center t :booktabs t :float t
% #+RESULTS:
% | | Y1 | Y2 | X1 | X2 |
% |----+-----+-----+-----+-----|
% | 1 | 223 | 226 | 224 | 214 |
% | 2 | 229 | 231 | 237 | 224 |
% | 3 | 234 | 230 | 239 | 231 |
% | 4 | 233 | 227 | 229 | 232 |
% | 5 | 225 | 212 | 228 | 228 |
% | 6 | 220 | 221 | 224 | 220 |
% | 7 | 206 | 207 | 228 | 226 |
% | 8 | 230 | 224 | 224 | 223 |
% | 9 | 223 | 231 | 228 | 233 |
% | 10 | 228 | 230 | 235 | 231 |
% | 11 | 197 | 207 | 211 | 204 |
% | 12 | 227 | 226 | 225 | 226 |
% | 13 | 215 | 228 | 231 | 220 |
% | 14 | 216 | 224 | 224 | 221 |
% | 15 | 209 | 214 | 220 | 221 |
% | 16 | 213 | 210 | 230 | 229 |
% An histogram of these measured dimensions is shown in Figure ref:fig:test_joints_size_hist.
figure;
histogram([(meas_flex(:,1)+meas_flex(:,2))/2,(meas_flex(:,3)+meas_flex(:,4))/2], 7)
xlabel("Beam's Thickness [$\mu m$]");
%% Save beam sizes
save('./mat/flex_meas_dim.mat', 'meas_flex');

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%% Clear Workspace and Close figures
clear; close all; clc;
%% Intialize Laplace variable
s = zpk('s');
%% Path for functions, data and scripts
addpath('./mat/'); % Path for data
%% Colors for the figures
colors = colororder;
% Flexible joint Geometry
% The flexible joint used for the Nano-Hexapod is shown in Figure ref:fig:test_joints_bend_geometry.
% Its bending stiffness is foreseen to be $k_{R_y}\approx 5\,\frac{Nm}{rad}$ and its stroke $\theta_{y,\text{max}}\approx 25\,mrad$.
% #+name: fig:test_joints_bend_geometry
% #+caption: Geometry of the flexible joint
% [[file:figs/test_joints_bend_geometry.png]]
% The height between the flexible point (center of the joint) and the point where external forces are applied is $h = 20\,mm$.
% Let's define the parameters on Matlab.
kRx = 5; % Bending Stiffness [Nm/rad]
Rxmax = 25e-3; % Bending Stroke [rad]
h = 20e-3; % Height [m]
% Required external applied force
% The bending $\theta_y$ of the flexible joint due to the force $F_x$ is:
% \begin{equation}
% \theta_y = \frac{M_y}{k_{R_y}} = \frac{F_x h}{k_{R_y}}
% \end{equation}
% Therefore, the applied force to test the full range of the flexible joint is:
% \begin{equation}
% F_{x,\text{max}} = \frac{k_{R_y} \theta_{y,\text{max}}}{h}
% \end{equation}
Fxmax = kRx*Rxmax/h; % Force to induce maximum stroke [N]
% And we obtain:
sprintf('\\begin{equation} F_{x,max} = %.1f\\, [N] \\end{equation}', Fxmax)
% Required actuator stroke and sensors range
% The flexible joint is designed to allow a bending motion of $\pm 25\,mrad$.
% The corresponding stroke at the location of the force sensor is:
% \[ d_{x,\text{max}} = h \tan(R_{x,\text{max}}) \]
dxmax = h*tan(Rxmax);
sprintf('\\begin{equation} d_{max} = %.1f\\, [mm] \\end{equation}', 1e3*dxmax)

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%% Clear Workspace and Close figures
clear; close all; clc;
%% Intialize Laplace variable
s = zpk('s');
%% Path for functions, data and scripts
addpath('./mat/'); % Path for data
%% Colors for the figures
colors = colororder;
% Finite Element Model
% From the Finite Element Model, the stiffness and stroke of the flexible joint have been computed and summarized in Tables ref:tab:test_joints_axial_shear_prop and ref:tab:test_joints_bending_torsion_prop.
%% Stiffness
ka = 94e6; % Axial Stiffness [N/m]
ks = 13e6; % Shear Stiffness [N/m]
kb = 5; % Bending Stiffness [Nm/rad]
kt = 260; % Torsional Stiffness [Nm/rad]
%% Maximum force
Fa = 469; % Axial Force before yield [N]
Fs = 242; % Shear Force before yield [N]
Fb = 0.118; % Bending Force before yield [Nm]
Ft = 1.508; % Torsional Force before yield [Nm]
%% Compute the corresponding stroke
Xa = Fa/ka; % Axial Stroke before yield [m]
Xs = Fs/ks; % Shear Stroke before yield [m]
Xb = Fb/kb; % Bending Stroke before yield [rad]
Xt = Ft/kt; % Torsional Stroke before yield [rad]
% Setup
% The setup is schematically represented in Figure ref:fig:test_joints_bench_side_bis.
% The force is applied on top of the flexible joint with a distance $h$ with the joint's center.
% The displacement of the flexible joint is also measured at the same height.
% The height between the joint's center and the force application point is:
h = 25e-3; % Height [m]
% Estimation error due to force sensor compression
% The measured displacement is not done directly at the joint's location.
% The force sensor compression will then induce an error on the joint's stiffness.
% The force sensor stiffness $k_F$ is estimated to be around:
kF = 50/0.05e-3; % [N/m]
sprintf('k_F = %.1e [N/m]', kF)
% Estimation error due to height estimation error
% Let's consider an error in the estimation of the height from the application of the force to the joint's center:
% \begin{equation}
% h_{\text{est}} = h (1 + \epsilon)
% \end{equation}
% The computed bending stiffness will be:
% \begin{equation}
% k_\text{est} \approx h_{\text{est}}^2 \frac{F_x}{d_x}
% \end{equation}
% And the stiffness estimation error is:
% \begin{equation}
% \frac{k_{\text{est}}}{k_{R_y}} = (1 + \epsilon)^2
% \end{equation}
h_err = 0.2e-3; % Height estimation error [m]

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