Add every computation files and data

.gitattributes

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 *.svg binary
 *.html binary
+*.mat binary

2017-11-17 - Marc/index.org

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+#+TITLE: Measurements
+:drawer:
+#+STARTUP: overview
+
+#+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: <script src="../js/jquery.min.js"></script>
+#+HTML_HEAD: <script src="../js/bootstrap.min.js"></script>
+#+HTML_HEAD: <script src="../js/jquery.stickytableheaders.min.js"></script>
+#+HTML_HEAD: <script src="../js/readtheorg.js"></script>
+
+#+LATEX_CLASS: cleanreport
+#+LaTeX_CLASS_OPTIONS: [tocnp, secbreak, minted]
+
+#+PROPERTY: header-args:matlab  :session *MATLAB*
+#+PROPERTY: header-args:matlab+ :comments org
+#+PROPERTY: header-args:matlab+ :exports both
+#+PROPERTY: header-args:matlab+ :eval no-export
+#+PROPERTY: header-args:matlab+ :noweb yes
+#+PROPERTY: header-args:matlab+ :mkdirp yes
+#+PROPERTY: header-args:matlab+ :output-dir figs
+:end:
+
+* Experimental conditions
+- Measurement made in a metrology lab
+- The granite is not glued to the floor
+- The Y-Translation stage is powered and in closed-loop
+- The spindle is not powered
+- Mass is placed on top of the Hexapod (*how much?*) (figure [[fig:accelerometers]]).
+- Made by Marc Lesourd on the 17th of November 2017
+
+#+name: fig:accelerometers
+#+caption: Accelerometers position
+#+attr_latex: :width 0.5\linewidth
+file:./figs/accelerometers.png
+
+#+name: fig:instrumented_hammer
+#+caption: Instrumented Hammer used
+#+attr_latex: :width 0.5\linewidth
+file:./figs/instrumented_hammer.png
+
+* Measurements procedure
+*3-axis Accelerometers* (specifications table [[tab:accelerometer]]) are glued on (see figure [[fig:accelerometers]]):
+- Marble
+- Y-Translation stage
+- Tilt stage
+- top of Hexapod
+
+#+NAME: tab:accelerometer
+#+CAPTION: Pieozoelectric acc. 356b18 - 3 axis
+| Sensitivity          | 0.102 V/(m/s2)  |
+| Measurement Range    | 4.9 m/s2 pk     |
+| Frequency Range      | 0.5 to 3000 Hz  |
+| resonant frequency   | >20000 Hz       |
+| broadband resolution | 0.0005 m/s2 rms |
+
+The structure is excited using an *instrumented hammer* with impacts on (see figure [[fig:instrumented_hammer]]):
+- Marble
+- Hexapod
+
+* Measurement Files
+Two measurements files are:
+- =id31_microstation_2017_11_17_frf.mat= that contains:
+  - =freq_frf= the frequency vector in Hz
+  - Computed frequency response functions (see table [[tab:data_name]])
+- =id31_microstation_2017_11_17_coh.mat=
+  - Computed coherence
+
+For each of the measurement, the measured channels are shown on table [[tab:meas_channels]].
+
+#+NAME: tab:data_name
+#+CAPTION: Description of the location of direction of the excitation for each measurement
+| Object name  | Location | Direction |
+|--------------+----------+-----------|
+| frf_hexa_x   | Hexapod  | X         |
+| frf_hexa_y   | Hexapod  | Y         |
+| frf_hexa_z   | Hexapod  | Z         |
+| frf_marble_x | Marble   | X         |
+| frf_marble_y | Marble   | Y         |
+| frf_marble_z | Marble   | Z         |
+
+#+NAME: tab:meas_channels
+#+CAPTION: Description of each measurement channel
+| Ch. nb | Element       | Location | Direction |
+|--------+---------------+----------+-----------|
+|      1 | Not wired     | na       | na        |
+|      2 | Accelerometer | Marble   | X         |
+|      3 | Accelerometer | Marble   | Y         |
+|      4 | Accelerometer | Marble   | Z         |
+|      5 | Accelerometer | Ty       | X         |
+|      6 | Accelerometer | Ty       | Y         |
+|      7 | Accelerometer | Ty       | Z         |
+|      8 | Accelerometer | Tilt     | X         |
+|      9 | Accelerometer | Tilt     | Y         |
+|     10 | Accelerometer | Tilt     | Z         |
+|     11 | Accelerometer | Hexapod  | X         |
+|     12 | Accelerometer | Hexapod  | Y         |
+|     13 | Accelerometer | Hexapod  | Z         |
+
+* Data Analysis
+** Loading of the data
+#+begin_src matlab :exports none :results silent
+  <<matlab-init>>
+#+end_src
+
+#+begin_src matlab :exports code :results none
+  load('./raw_data/id31_microstation_2017_11_17_coh.mat',...
+       'coh_hexa_x',...
+       'coh_hexa_y',...
+       'coh_hexa_z',...
+       'coh_marble_x',...
+       'coh_marble_y',...
+       'coh_marble_z');
+
+  load('./raw_data/id31_microstation_2017_11_17_frf.mat',...
+       'freq_frf',...
+       'frf_hexa_x',...
+       'frf_hexa_y',...
+       'frf_hexa_z',...
+       'frf_marble_x',...
+       'frf_marble_y',...
+       'frf_marble_z');
+#+end_src
+
+** Pre-processing of the data
+The FRF data are scaled with the sensitivity of the accelerometer and integrated two times to have the displacement instead of the acceleration.
+
+#+begin_src matlab :results none
+  accel_sensitivity = 0.102; % [V/(m/s2)]
+  w = j*2*pi*freq_frf; % j.omega in [rad/s]
+
+  frf_hexa_x =  1/accel_sensitivity*frf_hexa_x./(w.^2);
+  frf_hexa_y = -1/accel_sensitivity*frf_hexa_y./(w.^2);
+  frf_hexa_z = -1/accel_sensitivity*frf_hexa_z./(w.^2);
+
+  frf_marble_x =  1/accel_sensitivity*frf_marble_x./(w.^2);
+  frf_marble_y =  1/accel_sensitivity*frf_marble_y./(w.^2);
+  frf_marble_z = -1/accel_sensitivity*frf_marble_z./(w.^2);
+#+end_src
+
+** X-direction FRF
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_marble_x(:,  2)), 'DisplayName', 'Marble - X');
+  plot(freq_frf, abs(frf_marble_x(:,  5)), 'DisplayName', 'Ty - X');
+  plot(freq_frf, abs(frf_marble_x(:,  8)), 'DisplayName', 'Ry - X');
+  plot(freq_frf, abs(frf_marble_x(:, 11)), 'DisplayName', 'Hexa - X');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('Displacement/Force [m/N]');
+  xlim([20, 200]); xticks([20, 50, 100, 200]);
+  legend('Location', 'southwest');
+#+end_src
+
+#+NAME: fig:marble_x_frf
+#+HEADER: :tangle no :exports results :results raw :noweb yes
+#+begin_src matlab :var filepath="figs/marble_x_frf.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:marble_x_frf
+#+CAPTION: Response to a force applied on the marble in the X direction
+#+RESULTS: fig:marble_x_frf
+[[file:figs/marble_x_frf.png]]
+
+
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_hexa_x(:,  2)), 'DisplayName', 'Marble - X');
+  plot(freq_frf, abs(frf_hexa_x(:,  5)), 'DisplayName', 'Ty - X');
+  plot(freq_frf, abs(frf_hexa_x(:,  8)), 'DisplayName', 'Ry - X');
+  plot(freq_frf, abs(frf_hexa_x(:, 11)), 'DisplayName', 'Hexa - X');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('Displacement/Force [m/N]');
+  xlim([20, 200]); xticks([20, 50, 100, 200]);
+  legend('Location', 'southwest');
+#+end_src
+
+#+NAME: fig:hexa_x_frf
+#+HEADER: :tangle no :exports results :results raw :noweb yes
+#+begin_src matlab :var filepath="figs/hexa_x_frf.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:hexa_x_frf
+#+CAPTION: Response to a force applied on the hexa in the X direction
+#+RESULTS: fig:hexa_x_frf
+[[file:figs/hexa_x_frf.png]]
+
+** Y-direction FRF
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_marble_y(:,  3)), 'DisplayName', 'Marble - Y');
+  plot(freq_frf, abs(frf_marble_y(:,  6)), 'DisplayName', 'Ty - Y');
+  plot(freq_frf, abs(frf_marble_y(:,  9)), 'DisplayName', 'Ry - Y');
+  plot(freq_frf, abs(frf_marble_y(:, 12)), 'DisplayName', 'Hexa - Y');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('Displacement/Force [m/N]');
+  xlim([20, 200]); xticks([20, 50, 100, 200]);
+  legend('Location', 'southwest');
+#+end_src
+
+#+NAME: fig:marble_y_frf
+#+HEADER: :tangle no :exports results :results raw :noweb yes
+#+begin_src matlab :var filepath="figs/marble_y_frf.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:marble_y_frf
+#+CAPTION: Response to a force applied on the marble in the Y direction
+#+RESULTS: fig:marble_y_frf
+[[file:figs/marble_y_frf.png]]
+
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_hexa_y(:,  3)), 'DisplayName', 'Marble - Y');
+  plot(freq_frf, abs(frf_hexa_y(:,  6)), 'DisplayName', 'Ty - Y');
+  plot(freq_frf, abs(frf_hexa_y(:,  9)), 'DisplayName', 'Ry - Y');
+  plot(freq_frf, abs(frf_hexa_y(:, 12)), 'DisplayName', 'Hexa - Y');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('Displacement/Force [m/N]');
+  xlim([20, 200]); xticks([20, 50, 100, 200]);
+  legend('Location', 'southwest');
+#+end_src
+
+#+NAME: fig:hexa_y_frf
+#+HEADER: :tangle no :exports results :results raw :noweb yes
+#+begin_src matlab :var filepath="figs/hexa_y_frf.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:hexa_y_frf
+#+CAPTION: Response to a force applied on the hexa in the Y direction
+#+RESULTS: fig:hexa_y_frf
+[[file:figs/hexa_y_frf.png]]
+
+** Z-direction FRF
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_marble_z(:,  4)), 'DisplayName', 'Marble - Z');
+  plot(freq_frf, abs(frf_marble_z(:,  7)), 'DisplayName', 'Ty - Z');
+  plot(freq_frf, abs(frf_marble_z(:, 10)), 'DisplayName', 'Ry - Z');
+  plot(freq_frf, abs(frf_marble_z(:, 13)), 'DisplayName', 'Hexa - Z');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('Displacement/Force [m/N]');
+  xlim([20, 200]); xticks([20, 50, 100, 200]);
+  legend('Location', 'southwest');
+#+end_src
+
+#+NAME: fig:marble_z_frf
+#+HEADER: :tangle no :exports results :results raw :noweb yes
+#+begin_src matlab :var filepath="figs/marble_z_frf.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:marble_z_frf
+#+CAPTION: Response to a force applied on the marble in the Z direction
+#+RESULTS: fig:marble_z_frf
+[[file:figs/marble_z_frf.png]]
+
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_hexa_z(:,  4)), 'DisplayName', 'Marble - Z');
+  plot(freq_frf, abs(frf_hexa_z(:,  7)), 'DisplayName', 'Ty - Z');
+  plot(freq_frf, abs(frf_hexa_z(:, 10)), 'DisplayName', 'Ry - Z');
+  plot(freq_frf, abs(frf_hexa_z(:, 13)), 'DisplayName', 'Hexa - Z');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('Displacement/Force [m/N]');
+  xlim([20, 200]); xticks([20, 50, 100, 200]);
+  legend('Location', 'southwest');
+#+end_src
+
+#+NAME: fig:hexa_z_frf
+#+HEADER: :tangle no :exports results :results raw :noweb yes
+#+begin_src matlab :var filepath="figs/hexa_z_frf.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:hexa_z_frf
+#+CAPTION: Response to a force applied on the hexa in the Z direction
+#+RESULTS: fig:hexa_z_frf
+[[file:figs/hexa_z_frf.png]]

2017-11-17 - Marc/scripts/data.org

@@ -0,0 +1,112 @@
+#+TITLE: Measurements made by Marc Lessourd on the 17th of November 2017 - Matlab
+:drawer:
+#+LATEX_CLASS: cleanreport
+#+LaTeX_CLASS_OPTIONS: [tocnp, secbreak, minted]
+#+STARTUP: overview
+#+PROPERTY: header-args:matlab  :session *MATLAB*
+#+PROPERTY: header-args:matlab+ :comments org
+#+PROPERTY: header-args:matlab+ :exports both
+#+PROPERTY: header-args:matlab+ :eval no-export
+#+PROPERTY: header-args:matlab+ :noweb yes
+#+PROPERTY: header-args:matlab+ :mkdirp yes
+#+PROPERTY: header-args:matlab+ :output-dir figs
+:end:
+
+* Load the data
+#+begin_src matlab :exports code :results none
+  load('./raw_data/id31_microstation_2017_11_17_coh.mat',...
+       'coh_hexa_x',...
+       'coh_hexa_y',...
+       'coh_hexa_z',...
+       'coh_marble_x',...
+       'coh_marble_y',...
+       'coh_marble_z');
+  load('./raw_data/id31_microstation_2017_11_17_frf.mat',...
+       'freq_frf',...
+       'frf_hexa_x',...
+       'frf_hexa_y',...
+       'frf_hexa_z',...
+       'frf_marble_x',...
+       'frf_marble_y',...
+       'frf_marble_z');
+#+end_src
+
+Measurement is in V?
+#+begin_src matlab :results none
+  accel_sensitivity = 0.102; % [V/(m/s2)]
+  w = j*2*pi*freq_frf;
+
+  frf_hexa_x =  1/accel_sensitivity*frf_hexa_x./(w.^2);
+  frf_hexa_y = -1/accel_sensitivity*frf_hexa_y./(w.^2);
+  frf_hexa_z = -1/accel_sensitivity*frf_hexa_z./(w.^2);
+
+  frf_marble_x =  1/accel_sensitivity*frf_marble_x./(w.^2);
+  frf_marble_y =  1/accel_sensitivity*frf_marble_y./(w.^2);
+  frf_marble_z = -1/accel_sensitivity*frf_marble_z./(w.^2);
+#+end_src
+
+* Plots
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_hexa_x(:,  2)), 'DisplayName', 'Marble - X');
+  plot(freq_frf, abs(frf_hexa_x(:,  5)), 'DisplayName', 'Ty - X');
+  plot(freq_frf, abs(frf_hexa_x(:,  8)), 'DisplayName', 'Ry - X');
+  plot(freq_frf, abs(frf_hexa_x(:, 11)), 'DisplayName', 'Hexa - X');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlim([20, 200]);
+  legend('Location', 'northeast');
+#+end_src
+
+
+#+begin_src matlab :exports none :results none
+  figure;
+  hold on;
+  plot(freq_frf, abs(frf_hexa_x(:,  2)), 'DisplayName', 'Marble - X');
+  plot(freq_frf, abs(frf_hexa_x(:,  5)), 'DisplayName', 'Ty - X');
+  plot(freq_frf, abs(frf_hexa_x(:,  8)), 'DisplayName', 'Ry - X');
+  plot(freq_frf, abs(frf_hexa_x(:, 11)), 'DisplayName', 'Hexa - X');
+  hold off;
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+  xlim([20, 200]);
+  legend('Location', 'northeast');
+#+end_src
+
+
+#+begin_src matlab :exports none :results none
+  channel = 12;
+
+  figure;
+  ax1 = subaxis(3,1,1);
+  plot(freq_frf, abs(frf_hexa_y(:, channel)))
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log');
+
+  ax2 = subaxis(3,1,2);
+  plot(freq_frf, mod(180/pi*phase(frf_hexa_y(:, channel))+180, 360)-180)
+  set(gca, 'Xscale', 'log');
+  ylim([-180 180]);
+  yticks([-180:90:180]);
+
+  ax3 = subaxis(3,1,3);
+  plot(freq_frf, coh_hexa_y(:, channel))
+  set(gca, 'Xscale', 'log');
+
+  linkaxes([ax1,ax2,ax3],'x');
+  xlim([20, 200]);
+#+end_src
+
+
+#+begin_src matlab :exports none :results none
+  figure;
+  ax1 = subaxis(2,1,1);
+  plot(freq_frf, abs(frf_marble_z(:, 4)))
+  set(gca, 'Xscale', 'log'); set(gca, 'Yscale', 'log')
+  ax2 = subaxis(2,1,2);
+  plot(freq_frf, mod(180/pi*phase(frf_marble_z(:, 4))+180, 360)-180)
+  linkaxes([ax1,ax2],'x');
+  ylim([-180 180]);
+  yticks([-180:90:180]);
+  set(gca, 'Xscale', 'log')
+  xlim([20, 200])
+#+end_src

2017-11-17 - Marc/scripts/export_measure_data.m

@@ -0,0 +1,53 @@
+%%
+clear;
+close all;
+clc
+
+%% Coherence
+load('../raw_data/id31_microstation_2017_11_17_coh.mat', 'coh_hexa_x',...
+                                                        'coh_hexa_y',...
+                                                        'coh_hexa_z',...
+                                                        'coh_marble_x',...
+                                                        'coh_marble_y',...
+                                                        'coh_marble_z');
+
+%% Save Coherence data
+save('../data/id31_microstation_2017_11_17_coh.mat', ...
+     'coh_marble_x', ...
+     'coh_hexa_x', ...
+     'coh_marble_y', ...
+     'coh_hexa_y', ...
+     'coh_marble_z', ...
+     'coh_hexa_z');
+
+
+%% Frequency Response
+load('../raw_data/id31_microstation_2017_11_17_frf.mat', 'freq_frf', ...
+                                                        'frf_hexa_x',...
+                                                        'frf_hexa_y',...
+                                                        'frf_hexa_z',...
+                                                        'frf_marble_x',...
+                                                        'frf_marble_y',...
+                                                        'frf_marble_z');
+
+force_factor = 1;
+accel_factor = 1000;
+scale_factor = accel_factor/force_factor;
+
+frf_hexa_x =  scale_factor*frf_hexa_x;
+frf_hexa_y = -scale_factor*frf_hexa_y;
+frf_hexa_z = -scale_factor*frf_hexa_z;
+
+frf_marble_x =  scale_factor*frf_marble_x;
+frf_marble_y =  scale_factor*frf_marble_y;
+frf_marble_z = -scale_factor*frf_marble_z;
+
+%% Save Frequency Response Data
+save('../data/id31_microstation_2017_11_17_frf.mat', ...
+     'freq_frf', ...
+     'frf_marble_x', ...
+     'frf_hexa_x', ...
+     'frf_marble_y', ...
+     'frf_hexa_y', ...
+     'frf_marble_z', ...
+     'frf_hexa_z');

2017-11-17 - Marc/scripts/export_measure_object.m

@@ -0,0 +1,182 @@
+ground = struct(...
+    'full_name', 'Ground',...
+    'short_name', 'ground',...
+    'letter', 'g',...
+    'above_of', '',...
+    'bellow_of', 'marble',...
+    'tx', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    )...
+);
+marble = struct(...
+    'full_name', 'Marble',...
+    'short_name', 'marble',...
+    'letter', 'm',...
+    'above_of', 'ground',...
+    'bellow_of', 'trans_stage',...
+    'tx', struct(...
+        'isMeasured', true, ...
+        'isExcited', true, ...
+        'id', 2 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', true, ...
+        'isExcited', true, ...
+        'id', 3 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', true, ...
+        'isExcited', true, ...
+        'id', 4 ...
+    )...
+);
+trans_stage = struct(...
+    'full_name', 'Translation Stage',...
+    'short_name', 'trans_stage',...
+    'letter', 't',...
+    'above_of', 'marble',...
+    'bellow_of', 'tilt_stage',...
+    'tx', struct(...
+        'isMeasured', true, ...
+        'isExcited', false, ...
+        'id', 5 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', true, ...
+        'isExcited', false, ...
+        'id', 6 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', true, ...
+        'isExcited', false, ...
+        'id', 7 ...
+    )...
+);
+tilt_stage = struct(...
+    'full_name', 'Tilt Stage',...
+    'short_name', 'tilt_stage',...
+    'letter', 'o',...
+    'above_of', 'trans_stage',...
+    'bellow_of', 'hexa',...
+    'tx', struct(...
+        'isMeasured', true, ...
+        'isExcited', false, ...
+        'id', 8 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', true, ...
+        'isExcited', false, ...
+        'id', 9 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', true, ...
+        'isExcited', false, ...
+        'id', 10 ...
+    )...
+);
+hexa = struct(...
+    'full_name', 'Hexapod',...
+    'short_name', 'hexa',...
+    'letter', 'h',...
+    'above_of', 'tilt_stage',...
+    'bellow_of', 'nano_stage',...
+    'tx', struct(...
+        'isMeasured', true, ...
+        'isExcited', true, ...
+        'id', 11 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', true, ...
+        'isExcited', true, ...
+        'id', 12 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', true, ...
+        'isExcited', true, ...
+        'id', 13 ...
+    )...
+);
+nano_stage = struct(...
+    'full_name', 'Nano Stage',...
+    'short_name', 'nano_stage',...
+    'letter', 'n',...
+    'above_of', 'hexa',...
+    'bellow_of', 'sample',...
+    'tx', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    )...
+);
+sample = struct(...
+    'full_name', 'Sample',...
+    'short_name', 'sample',...
+    'letter', 's',...
+    'above_of', 'nano_stage',...
+    'bellow_of', '',...
+    'tx', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    ),...
+    'ty', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    ),...
+    'tz', struct(...
+        'isMeasured', false, ...
+        'isExcited', false, ...
+        'id', 0 ...
+    )...
+);
+%%
+elements = struct(...
+    'ground', ground,...
+    'marble', marble,...
+    'trans_stage', trans_stage,...
+    'tilt_stage', tilt_stage,...
+    'hexa', hexa,...
+    'nano_stage', nano_stage,...
+    'sample', sample ...
+);
+
+%% Where is located the data files generated by export_measure_data script
+files = struct(...
+    'frf', 'id31_microstation_2017_11_17_frf.mat',...
+    'coh', 'id31_microstation_2017_11_17_coh.mat' ...
+);
+
+%%
+m_object = struct(...
+    'files',    files,...
+    'elements', elements,...
+    'quantity', 'acceleration', ...
+    'notes',    'Mesures du 17/11/2017 par Marc Lessourd - Accelerometers' ...
+);
+
+
+%% Save m_object
+save('../data/2017_11_17.mat', 'm_object')