Add first analysis

slip-ring-test/figs/.gitignore

@@ -0,0 +1,3 @@
+*.svg
+*.pdf
+*.tex

slip-ring-test/index.org

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+#+TITLE:SpeedGoat
+: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 type="text/javascript" src="js/jquery.stickytableheaders.min.js"></script>
+#+HTML_HEAD: <script type="text/javascript" src="js/readtheorg.js"></script>
+
+#+LATEX_CLASS: cleanreport
+#+LaTeX_CLASS_OPTIONS: [tocnp, secbreak, minted]
+#+LaTeX_HEADER: \usepackage{svg}
+#+LaTeX_HEADER: \newcommand{\authorFirstName}{Thomas}
+#+LaTeX_HEADER: \newcommand{\authorLastName}{Dehaeze}
+#+LaTeX_HEADER: \newcommand{\authorEmail}{dehaeze.thomas@gmail.com}
+
+#+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+ :output-dir figs
+#+PROPERTY: header-args:matlab+ :mkdirp yes
+:END:
+
+* Matlab Init                                               :noexport:ignore:
+#+begin_src matlab :exports none :results silent :noweb yes
+  <<matlab-init>>
+#+end_src
+
+* Load data
+#+begin_src matlab :results none
+  load('mat/data_001.mat', 't', 'x1', 'x2');
+  dt = t(2) - t(1);
+#+end_src
+
+* Time Domain Data
+#+begin_src matlab :results none
+  figure;
+  hold on;
+  plot(t, x1);
+  plot(t, x2);
+  hold off;
+  xlabel('Time [s]');
+  ylabel('Voltage [V]');
+  xlim([t(1), t(end)]);
+#+end_src
+
+#+NAME: fig:data_time_domain
+#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
+#+begin_src matlab :var filepath="figs/data_time_domain.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:data_time_domain
+#+CAPTION: Time domain Data
+#+RESULTS: fig:data_time_domain
+[[file:figs/data_time_domain.png]]
+
+
+#+begin_src matlab :results none
+  figure;
+  hold on;
+  plot(t, x1);
+  plot(t, x2);
+  hold off;
+  xlabel('Time [s]');
+  ylabel('Voltage [V]');
+  xlim([0 1]);
+#+end_src
+
+#+NAME: fig:data_time_domain_zoom
+#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
+#+begin_src matlab :var filepath="figs/data_time_domain_zoom.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:data_time_domain_zoom
+#+CAPTION: Time domain Data - Zoom
+#+RESULTS: fig:data_time_domain_zoom
+[[file:figs/data_time_domain_zoom.png]]
+
+* Compute PSD
+#+begin_src matlab :results none
+  [pxx1, f1] = pwelch(x1, hanning(ceil(length(t)/100)), 0, [], 1/dt);
+  [pxx2, f2] = pwelch(x2, hanning(ceil(length(t)/100)), 0, [], 1/dt);
+#+end_src
+
+* Take into account sensibility of Geophone
+The Geophone used are L22.
+#+begin_src matlab :results none
+  S0 = 88; % Sensitivity [V/(m/s)]
+  f0 = 2; % Cut-off frequnecy [Hz]
+  S = (s/2/pi/f0)/(1+s/2/pi/f0);
+#+end_src
+
+#+begin_src matlab :results none
+  figure;
+  bodeFig({S});
+  ylabel('Amplitude [V/(m/s)]')
+#+end_src
+
+#+NAME: fig:geophone_sensibility
+#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
+#+begin_src matlab :var filepath="figs/geophone_sensibility.pdf" :var figsize="wide-normal" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:geophone_sensibility
+#+CAPTION: Sensibility of the Geophone
+#+RESULTS: fig:geophone_sensibility
+[[file:figs/geophone_sensibility.png]]
+
+
+We take into account the gain of the electronics.
+The cut-off frequency is set at 1kHz.
+
+- [ ] Check what is the order of the filter
+- [ ] Maybe I should not use this filter as there is no high frequencies anyway?
+
+#+begin_src matlab :results none
+  G0 = 60; % [dB]
+
+  G = G0/(1+s/2/pi/1000);
+#+end_src
+
+#+begin_src matlab :results none
+  figure;
+  hold on;
+  plot(f1, sqrt(pxx1)./squeeze(abs(freqresp(G, f1, 'Hz')))./squeeze(abs(freqresp(S, f1, 'Hz'))));
+  plot(f2, sqrt(pxx2)./squeeze(abs(freqresp(G, f2, 'Hz')))./squeeze(abs(freqresp(S, f2, 'Hz'))));
+  hold off;
+  set(gca, 'xscale', 'log');
+  set(gca, 'yscale', 'log');
+  xlabel('Frequency [Hz]'); ylabel('PSD [m/s/sqrt(Hz)]')
+#+end_src
+
+#+NAME: fig:psd_velocity
+#+HEADER: :tangle no :exports results :results value raw replace :noweb yes
+#+begin_src matlab :var filepath="figs/psd_velocity.pdf" :var figsize="full-tall" :post pdf2svg(file=*this*, ext="png")
+  <<plt-matlab>>
+#+end_src
+
+#+NAME: fig:psd_velocity
+#+CAPTION: Spectral density of the velocity
+#+RESULTS: fig:psd_velocity
+[[file:figs/psd_velocity.png]]

slip-ring-test/readme.org

@@ -1 +1,2 @@
-* TODO Register data on the computer
+* DONE Register data on the computer
+  CLOSED: [2019-04-17 mer. 17:26]

slip-ring-test/run_test.m

@@ -45,4 +45,3 @@ window_L = ceil(length(x1)/10);
 window_han = .5*(1 - cos(2*pi*(1:window_L)'/(window_L+1)));
 
 [pxx, f] = pwelch(x1, window_han, 0, [], 1/dt);
-