168 lines
5.5 KiB
Org Mode
168 lines
5.5 KiB
Org Mode
#+TITLE: Measurements
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:DRAWER:
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#+STARTUP: overview
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#+LANGUAGE: en
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#+EMAIL: dehaeze.thomas@gmail.com
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#+AUTHOR: Dehaeze Thomas
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#+HTML_LINK_HOME: ../index.html
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#+HTML_LINK_UP: ../index.html
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../css/htmlize.css"/>
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../css/readtheorg.css"/>
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#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../css/zenburn.css"/>
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#+HTML_HEAD: <script type="text/javascript" src="../js/jquery.min.js"></script>
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#+HTML_HEAD: <script type="text/javascript" src="../js/bootstrap.min.js"></script>
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#+HTML_HEAD: <script type="text/javascript" src="../js/jquery.stickytableheaders.min.js"></script>
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#+HTML_HEAD: <script type="text/javascript" src="../js/readtheorg.js"></script>
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#+HTML_MATHJAX: align: center tagside: right font: TeX
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#+PROPERTY: header-args:matlab :session *MATLAB*
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#+PROPERTY: header-args:matlab+ :comments org
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#+PROPERTY: header-args:matlab+ :results none
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#+PROPERTY: header-args:matlab+ :exports both
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#+PROPERTY: header-args:matlab+ :eval no-export
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#+PROPERTY: header-args:matlab+ :output-dir figs
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#+PROPERTY: header-args:shell :eval no-export
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:END:
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* Experimental conditions
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- Measurement made in the experiment hutch
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- FS=256Hz
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- Made by Marc Lesourd on the 12 of October 2018
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| *Date* | 2018-10-12 |
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| *Sensors* | Geophones |
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| *Excitation* | Instrumented Hammer |
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| *Location* | Experimental Hutch |
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*Goal*:
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- The station is now installed on the experimental hutch with a glued granite (final location).
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- The station is identified again.
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* Measurements procedure
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8 *Geophone* are used (see table [[tab:meas_channels]]):
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- 7 L-28LB geophones (table [[tab:L-28LB]])
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- 1 L-4C geophone (table [[tab:L-4C]])
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#+NAME: tab:L-28LB
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#+CAPTION: L-28LB Geophone characteristics
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| Natural Frequency [Hz] | 4.5 |
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| Weight [g] | 140 |
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| Sensitivity [V/(m/s)] | 31.3 |
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#+NAME: tab:L-4C
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#+CAPTION: L-4C Geophone characteristics
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| Natural Frequency [Hz] | 1 |
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| Weight [g] | 2150 |
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| Sensitivity [V/(m/s)] | 276.8 |
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The structure is excited using an *instrumented hammer* with impacts on (see table [[tab:measurements]]):
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- Marble
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- Ty
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- Hexapod
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* Measurement Channels
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Les fichiers xxx_raw sont sans traitement dans le domaine temporel (environ 10 impacts par fichier)
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#+NAME: tab:meas_channels
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#+CAPTION: Description of each measurement channel
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| Ch. nb | Element | Location | Direction |
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|--------+-----------------+----------+-----------|
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| 1 | Geophone L-4C | Marble | Z |
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| 2 | Geophone L-28LB | Ty | Z |
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| 3 | Geophone L-28LB | Tilt | Z |
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| 4 | Geophone L-28LB | Hexa | Z |
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| 5 | Geophone L-28LB | Marble | H |
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| 6 | Geophone L-28LB | TY | H |
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| 7 | Geophone L-28LB | Tilt | H |
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| 8 | Geophone L-28LB | Hexa | H |
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|--------+-----------------+----------+-----------|
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| 9 | Hammer | Variable | Variable |
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* Experiments
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#+NAME: tab:measurements
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#+CAPTION: Description of the location of direction of the excitation for each measurement
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| Meas. nb | Location | Direction |
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|----------+----------+-----------|
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| 1 | Marble | Y |
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| 2 | Ty | Y |
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| 3 | Hexa | Y |
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|----------+----------+-----------|
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| 4 | Marble | Z |
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| 5 | Ty | Z |
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| 6 | Hexa | Z |
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|----------+----------+-----------|
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| 7 | Marble | X |
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| 8 | Ty | X |
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| 9 | Hexa | X |
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* Data Analysis
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** Matlab Init :noexport:ignore:
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#+begin_src matlab :tangle no :exports none :results silent :noweb yes :var current_dir=(file-name-directory buffer-file-name)
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<<matlab-dir>>
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#+end_src
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#+begin_src matlab :exports none :results silent :noweb yes
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<<matlab-init>>
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#+end_src
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** Loading of the data
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#+begin_src matlab :exports code :results none
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load('./data/freq_frf.mat');
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load('./data/frf_hexa_x.mat');
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load('./data/frf_hexa_y.mat');
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load('./data/frf_hexa_z.mat');
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load('./data/frf_marble_x.mat');
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load('./data/frf_marble_y.mat');
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load('./data/frf_marble_z.mat');
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load('./data/frf_ty_x.mat');
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load('./data/frf_ty_y.mat');
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load('./data/frf_ty_z.mat');
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load('./data/phs_hexa_x.mat');
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load('./data/phs_hexa_y.mat');
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load('./data/phs_hexa_z.mat');
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load('./data/phs_marble_x.mat');
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load('./data/phs_marble_y.mat');
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load('./data/phs_marble_z.mat');
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load('./data/phs_ty_x.mat');
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load('./data/phs_ty_y.mat');
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load('./data/phs_ty_z.mat');
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#+end_src
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** test
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#+begin_src matlab
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figure;
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hold on;
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plot(freq_frf, abs(ReIm7(:, 5))./(2*pi*freq_frf), 'DisplayName', 'Marble')
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plot(freq_frf, abs(ReIm8(:, 6))./(2*pi*freq_frf), 'DisplayName', 'Ty')
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% plot(freq_frf, abs(ReIm5(:, 3))./(2*pi*freq_frf), 'DisplayName', 'Tilt')
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plot(freq_frf, abs(ReIm9(:, 8))./(2*pi*freq_frf), 'DisplayName', 'Hexapod')
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hold off;
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xlim([1, 100]);
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set(gca, 'xscale', 'log'); set(gca, 'yscale', 'log');
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legend('location', 'northwest');
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#+end_src
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#+begin_src matlab
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figure;
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hold on;
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plot(freq_frf, abs(ReIm5(:, 1))./(2*pi*freq_frf), 'DisplayName', 'Marble')
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plot(freq_frf, abs(ReIm5(:, 2))./(2*pi*freq_frf), 'DisplayName', 'Ty')
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plot(freq_frf, abs(ReIm5(:, 3))./(2*pi*freq_frf), 'DisplayName', 'Tilt')
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plot(freq_frf, abs(ReIm5(:, 4))./(2*pi*freq_frf), 'DisplayName', 'Hexapod')
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hold off;
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xlim([1, 100]);
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set(gca, 'xscale', 'log'); set(gca, 'yscale', 'log');
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legend('location', 'northwest');
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#+end_src
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