Removed section about identification with DAC

index.org

@@ -55,6 +55,7 @@
 :header-args:matlab+: :tangle matlab/huddle_test.m
 :header-args:matlab+: :comments org :mkdirp yes
 :END:
+<<sec:huddle_test>>
 
 ** Matlab Init                                             :noexport:ignore:
 #+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)
@@ -127,202 +128,6 @@
 #+RESULTS:
 [[file:figs/huddle_test_pdf.png]]
 
-* Transfer Function Estimation using the DAC as the driver          :noexport:
-:PROPERTIES:
-:header-args:matlab+: :tangle matlab/tf_estimation.m
-:header-args:matlab+: :comments org :mkdirp yes
-:END:
-
-** Introduction                                                      :ignore:
-#+begin_important
-Results presented in this sections are wrong as the ADC cannot deliver enought current to the piezoelectric actuator.
-#+end_important
-
-** 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
-  addpath('./matlab/mat/');
-#+end_src
-
-#+begin_src matlab :eval no
-  addpath('./mat/');
-#+end_src
-
-** Load Data                                                       :noexport:
-#+begin_src matlab
-  ht = load('huddle_test.mat', 't', 'u', 'y');
-  load('apa95ml_5kg_10V.mat', 't', 'u', 'y');
-#+end_src
-
-** Time Domain Data
-#+begin_src matlab :exports none
-  figure;
-
-  subplot(1,2,1);
-  plot(t, u)
-  ylabel('Input Voltage [V]'); xlabel('Time [s]');
-
-
-  subplot(1,2,2);
-  plot(t, y)
-  ylabel('Output Displacement [m]'); xlabel('Time [s]');
-#+end_src
-
-#+begin_src matlab :tangle no :exports results :results file replace
-  exportFig('figs/apa95ml_5kg_10V_time_domain.pdf', 'width', 'full', 'height', 'tall');
-#+end_src
-
-#+name: fig:apa95ml_5kg_10V_time_domain
-#+caption: Time domain signals during the test
-#+RESULTS:
-[[file:figs/apa95ml_5kg_10V_time_domain.png]]
-
-** Comparison of the PSD with Huddle Test
-#+begin_src matlab
-  Ts = t(end)/(length(t)-1);
-  Fs = 1/Ts;
-
-  win = hanning(ceil(1*Fs));
-#+end_src
-
-#+begin_src matlab
-  [pxx, f] = pwelch(y, win, [], [], Fs);
-  [pht, ~] = pwelch(ht.y, win, [], [], Fs);
-#+end_src
-
-#+begin_src matlab :exports none
-  figure;
-  hold on;
-  plot(f, sqrt(pxx), 'DisplayName', '5kg');
-  plot(f, sqrt(pht), 'DisplayName', 'Huddle Test');
-  hold off;
-  set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
-  xlabel('Frequency [Hz]'); ylabel('ASD [$m/\sqrt{Hz}$]');
-  legend('location', 'northeast');
-  xlim([1, Fs/2]);
-#+end_src
-
-#+begin_src matlab :tangle no :exports results :results file replace
-  exportFig('figs/apa95ml_5kg_10V_pdf_comp_huddle.pdf', 'width', 'wide', 'height', 'tall');
-#+end_src
-
-#+name: fig:apa95ml_5kg_10V_pdf_comp_huddle
-#+caption: Comparison of the ASD for the identification test and the huddle test
-#+RESULTS:
-[[file:figs/apa95ml_5kg_10V_pdf_comp_huddle.png]]
-
-** Compute TF estimate and Coherence
-#+begin_src matlab
-  Ts = t(end)/(length(t)-1);
-  Fs = 1/Ts;
-#+end_src
-
-#+begin_src matlab
-  win = hann(ceil(1/Ts));
-
-  [tf_est, f] = tfestimate(u, -y, win, [], [], 1/Ts);
-  [co_est, ~] = mscohere(  u, -y, win, [], [], 1/Ts);
-#+end_src
-
-#+begin_src matlab :exports none
-  figure;
-
-  hold on;
-  plot(f, co_est, 'k-')
-  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
-  ylabel('Coherence'); xlabel('Frequency [Hz]');
-  hold off;
-  xlim([10, 5e3]);
-#+end_src
-
-#+begin_src matlab :tangle no :exports results :results file replace
-  exportFig('figs/apa95ml_5kg_10V_coh.pdf', 'width', 'wide', 'height', 'normal');
-#+end_src
-
-#+name: fig:apa95ml_5kg_10V_coh
-#+caption: Coherence
-#+RESULTS:
-[[file:figs/apa95ml_5kg_10V_coh.png]]
-
-#+begin_src matlab :exports none
-  figure;
-  ax1 = subplot(2, 1, 1);
-  hold on;
-  plot(f, abs(tf_est), 'k-')
-  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
-  ylabel('Amplitude'); xlabel('Frequency [Hz]');
-  hold off;
-
-  ax2 = subplot(2, 1, 2);
-  hold on;
-  plot(f, 180/pi*angle(tf_est), 'k-')
-  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
-  ylabel('Phase'); xlabel('Frequency [Hz]');
-  hold off;
-
-  linkaxes([ax1,ax2], 'x');
-  xlim([10, 5e3]);
-#+end_src
-
-#+begin_src matlab :tangle no :exports results :results file replace
-  exportFig('figs/apa95ml_5kg_10V_tf.pdf', 'width', 'full', 'height', 'full');
-#+end_src
-
-#+name: fig:apa95ml_5kg_10V_tf
-#+caption: Estimation of the transfer function from input voltage to displacement
-#+RESULTS:
-[[file:figs/apa95ml_5kg_10V_tf.png]]
-
-** Comparison with the FEM model
-#+begin_src matlab
-  load('fem_model_5kg.mat', 'Ghm');
-#+end_src
-
-#+begin_src matlab :exports none
-  figure;
-  ax1 = subplot(2, 1, 1);
-  hold on;
-  plot(f, abs(tf_est), 'DisplayName', 'Identification')
-  plot(f, abs(squeeze(freqresp(Ghm, f, 'Hz'))), 'DisplayName', 'FEM')
-  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
-  ylabel('Amplitude'); xlabel('Frequency [Hz]');
-  legend('location', 'northeast')
-  hold off;
-
-  ax2 = subplot(2, 1, 2);
-  hold on;
-  plot(f, 180/pi*angle(tf_est))
-  plot(f, 180/pi*angle(squeeze(freqresp(Ghm, f, 'Hz'))))
-  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'lin');
-  ylabel('Phase'); xlabel('Frequency [Hz]');
-  hold off;
-
-  linkaxes([ax1,ax2], 'x');
-  xlim([10, 5e3]);
-#+end_src
-
-#+begin_src matlab :tangle no :exports results :results file replace
-  exportFig('figs/apa95ml_5kg_comp_fem.pdf', 'width', 'full', 'height', 'full');
-#+end_src
-
-#+name: fig:apa95ml_5kg_comp_fem
-#+caption: Comparison of the identified transfer function and the one estimated from the FE model
-#+RESULTS:
-[[file:figs/apa95ml_5kg_comp_fem.png]]
-
-** Conclusion                                                        :ignore:
-#+begin_important
-The problem comes from the fact that the piezo is driven directly by the DAC that cannot deliver enought current.
-In the next section, a current amplifier is used.
-#+end_important
-
 * Transfer Function Estimation using the PI Amplifier
 ** Matlab Init                                             :noexport:ignore:
 #+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)