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<title>Measurements</title>
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<h1 class="title">Measurements</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org4a44203">1. Experimental conditions</a></li>
<li><a href="#org91fa62d">2. Measurements procedure</a></li>
<li><a href="#org015e1bd">3. Measurement Channels</a></li>
<li><a href="#org807ceb5">4. Experiments</a></li>
<li><a href="#org3f0d1ab">5. Data Analysis</a>
<ul>
<li><a href="#org589082c">5.1. Loading of the data</a></li>
<li><a href="#org48f106f">5.2. test</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-org4a44203" class="outline-2">
<h2 id="org4a44203"><span class="section-number-2">1</span> Experimental conditions</h2>
<div class="outline-text-2" id="text-1">
<ul class="org-ul">
<li>Measurement made in the experiment hutch</li>
<li>FS=256Hz</li>
<li>Made by Marc Lesourd on the 12 of October 2018</li>
</ul>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<colgroup>
<col class="org-left" />
<col class="org-left" />
</colgroup>
<tbody>
<tr>
<td class="org-left"><b>Date</b></td>
<td class="org-left">2018-10-12</td>
</tr>
<tr>
<td class="org-left"><b>Sensors</b></td>
<td class="org-left">Geophones</td>
</tr>
<tr>
<td class="org-left"><b>Excitation</b></td>
<td class="org-left">Instrumented Hammer</td>
</tr>
<tr>
<td class="org-left"><b>Location</b></td>
<td class="org-left">Experimental Hutch</td>
</tr>
</tbody>
</table>
<p>
<b>Goal</b>:
</p>
<ul class="org-ul">
<li>The station is now installed on the experimental hutch with a glued granite (final location).</li>
<li>The station is identified again.</li>
</ul>
</div>
</div>
<div id="outline-container-org91fa62d" class="outline-2">
<h2 id="org91fa62d"><span class="section-number-2">2</span> Measurements procedure</h2>
<div class="outline-text-2" id="text-2">
<p>
8 <b>Geophone</b> are used (see table <a href="#org0f49883">3</a>):
</p>
<ul class="org-ul">
<li>7 L-28LB geophones (table <a href="#org42d983e">1</a>)</li>
<li>1 L-4C geophone (table <a href="#orge7d5d0f">2</a>)</li>
</ul>
<table id="org42d983e" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 1:</span> L-28LB Geophone characteristics</caption>
<colgroup>
<col class="org-left" />
<col class="org-right" />
</colgroup>
<tbody>
<tr>
<td class="org-left">Natural Frequency [Hz]</td>
<td class="org-right">4.5</td>
</tr>
<tr>
<td class="org-left">Weight [g]</td>
<td class="org-right">140</td>
</tr>
<tr>
<td class="org-left">Sensitivity [V/(m/s)]</td>
<td class="org-right">31.3</td>
</tr>
</tbody>
</table>
<table id="orge7d5d0f" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 2:</span> L-4C Geophone characteristics</caption>
<colgroup>
<col class="org-left" />
<col class="org-right" />
</colgroup>
<tbody>
<tr>
<td class="org-left">Natural Frequency [Hz]</td>
<td class="org-right">1</td>
</tr>
<tr>
<td class="org-left">Weight [g]</td>
<td class="org-right">2150</td>
</tr>
<tr>
<td class="org-left">Sensitivity [V/(m/s)]</td>
<td class="org-right">276.8</td>
</tr>
</tbody>
</table>
<p>
The structure is excited using an <b>instrumented hammer</b> with impacts on (see table <a href="#orgb99d784">4</a>):
</p>
<ul class="org-ul">
<li>Marble</li>
<li>Ty</li>
<li>Hexapod</li>
</ul>
</div>
</div>
<div id="outline-container-org015e1bd" class="outline-2">
<h2 id="org015e1bd"><span class="section-number-2">3</span> Measurement Channels</h2>
<div class="outline-text-2" id="text-3">
<p>
Les fichiers xxx_raw sont sans traitement dans le domaine temporel (environ 10 impacts par fichier)
</p>
<table id="org0f49883" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 3:</span> Description of each measurement channel</caption>
<colgroup>
<col class="org-right" />
<col class="org-left" />
<col class="org-left" />
<col class="org-left" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-right">Ch. nb</th>
<th scope="col" class="org-left">Element</th>
<th scope="col" class="org-left">Location</th>
<th scope="col" class="org-left">Direction</th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-right">1</td>
<td class="org-left">Geophone L-4C</td>
<td class="org-left">Marble</td>
<td class="org-left">Z</td>
</tr>
<tr>
<td class="org-right">2</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">Ty</td>
<td class="org-left">Z</td>
</tr>
<tr>
<td class="org-right">3</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">Tilt</td>
<td class="org-left">Z</td>
</tr>
<tr>
<td class="org-right">4</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">Hexa</td>
<td class="org-left">Z</td>
</tr>
<tr>
<td class="org-right">5</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">Marble</td>
<td class="org-left">H</td>
</tr>
<tr>
<td class="org-right">6</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">TY</td>
<td class="org-left">H</td>
</tr>
<tr>
<td class="org-right">7</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">Tilt</td>
<td class="org-left">H</td>
</tr>
<tr>
<td class="org-right">8</td>
<td class="org-left">Geophone L-28LB</td>
<td class="org-left">Hexa</td>
<td class="org-left">H</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-right">9</td>
<td class="org-left">Hammer</td>
<td class="org-left">Variable</td>
<td class="org-left">Variable</td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="outline-container-org807ceb5" class="outline-2">
<h2 id="org807ceb5"><span class="section-number-2">4</span> Experiments</h2>
<div class="outline-text-2" id="text-4">
<table id="orgb99d784" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 4:</span> Description of the location of direction of the excitation for each measurement</caption>
<colgroup>
<col class="org-right" />
<col class="org-left" />
<col class="org-left" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-right">Meas. nb</th>
<th scope="col" class="org-left">Location</th>
<th scope="col" class="org-left">Direction</th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-right">1</td>
<td class="org-left">Marble</td>
<td class="org-left">Y</td>
</tr>
<tr>
<td class="org-right">2</td>
<td class="org-left">Ty</td>
<td class="org-left">Y</td>
</tr>
<tr>
<td class="org-right">3</td>
<td class="org-left">Hexa</td>
<td class="org-left">Y</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-right">4</td>
<td class="org-left">Marble</td>
<td class="org-left">Z</td>
</tr>
<tr>
<td class="org-right">5</td>
<td class="org-left">Ty</td>
<td class="org-left">Z</td>
</tr>
<tr>
<td class="org-right">6</td>
<td class="org-left">Hexa</td>
<td class="org-left">Z</td>
</tr>
</tbody>
<tbody>
<tr>
<td class="org-right">7</td>
<td class="org-left">Marble</td>
<td class="org-left">X</td>
</tr>
<tr>
<td class="org-right">8</td>
<td class="org-left">Ty</td>
<td class="org-left">X</td>
</tr>
<tr>
<td class="org-right">9</td>
<td class="org-left">Hexa</td>
<td class="org-left">X</td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="outline-container-org3f0d1ab" class="outline-2">
<h2 id="org3f0d1ab"><span class="section-number-2">5</span> Data Analysis</h2>
<div class="outline-text-2" id="text-5">
</div>
<div id="outline-container-org589082c" class="outline-3">
<h3 id="org589082c"><span class="section-number-3">5.1</span> Loading of the data</h3>
<div class="outline-text-3" id="text-5-1">
<div class="org-src-container">
<pre class="src src-matlab">load(<span class="org-string">'./data/freq_frf.mat'</span>);
load(<span class="org-string">'./data/frf_hexa_x.mat'</span>);
load(<span class="org-string">'./data/frf_hexa_y.mat'</span>);
load(<span class="org-string">'./data/frf_hexa_z.mat'</span>);
load(<span class="org-string">'./data/frf_marble_x.mat'</span>);
load(<span class="org-string">'./data/frf_marble_y.mat'</span>);
load(<span class="org-string">'./data/frf_marble_z.mat'</span>);
load(<span class="org-string">'./data/frf_ty_x.mat'</span>);
load(<span class="org-string">'./data/frf_ty_y.mat'</span>);
load(<span class="org-string">'./data/frf_ty_z.mat'</span>);
load(<span class="org-string">'./data/phs_hexa_x.mat'</span>);
load(<span class="org-string">'./data/phs_hexa_y.mat'</span>);
load(<span class="org-string">'./data/phs_hexa_z.mat'</span>);
load(<span class="org-string">'./data/phs_marble_x.mat'</span>);
load(<span class="org-string">'./data/phs_marble_y.mat'</span>);
load(<span class="org-string">'./data/phs_marble_z.mat'</span>);
load(<span class="org-string">'./data/phs_ty_x.mat'</span>);
load(<span class="org-string">'./data/phs_ty_y.mat'</span>);
load(<span class="org-string">'./data/phs_ty_z.mat'</span>);
</pre>
</div>
</div>
</div>
<div id="outline-container-org48f106f" class="outline-3">
<h3 id="org48f106f"><span class="section-number-3">5.2</span> test</h3>
<div class="outline-text-3" id="text-5-2">
<div class="org-src-container">
<pre class="src src-matlab"><span class="org-type">figure</span>;
hold on;
plot(freq_frf, abs(ReIm7(<span class="org-type">:</span>, 5))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Marble'</span>)
plot(freq_frf, abs(ReIm8(<span class="org-type">:</span>, 6))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Ty'</span>)
<span class="org-comment">% plot(freq_frf, abs(ReIm5(:, 3))./(2*pi*freq_frf), 'DisplayName', 'Tilt')</span>
plot(freq_frf, abs(ReIm9(<span class="org-type">:</span>, 8))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Hexapod'</span>)
hold off;
xlim([1, 100]);
<span class="org-type">set</span>(<span class="org-variable-name">gca</span>, <span class="org-string">'xscale'</span>, <span class="org-string">'log'</span>); <span class="org-type">set</span>(<span class="org-variable-name">gca</span>, <span class="org-string">'yscale'</span>, <span class="org-string">'log'</span>);
legend(<span class="org-string">'location'</span>, <span class="org-string">'northwest'</span>);
</pre>
</div>
<div class="org-src-container">
<pre class="src src-matlab"><span class="org-type">figure</span>;
hold on;
plot(freq_frf, abs(ReIm5(<span class="org-type">:</span>, 1))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Marble'</span>)
plot(freq_frf, abs(ReIm5(<span class="org-type">:</span>, 2))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Ty'</span>)
plot(freq_frf, abs(ReIm5(<span class="org-type">:</span>, 3))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Tilt'</span>)
plot(freq_frf, abs(ReIm5(<span class="org-type">:</span>, 4))<span class="org-type">./</span>(2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">*</span>freq_frf), <span class="org-string">'DisplayName'</span>, <span class="org-string">'Hexapod'</span>)
hold off;
xlim([1, 100]);
<span class="org-type">set</span>(<span class="org-variable-name">gca</span>, <span class="org-string">'xscale'</span>, <span class="org-string">'log'</span>); <span class="org-type">set</span>(<span class="org-variable-name">gca</span>, <span class="org-string">'yscale'</span>, <span class="org-string">'log'</span>);
legend(<span class="org-string">'location'</span>, <span class="org-string">'northwest'</span>);
</pre>
</div>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Dehaeze Thomas</p>
<p class="date">Created: 2020-11-12 jeu. 10:27</p>
</div>
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