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Thomas Dehaeze
2019-05-14 23:06:50 +02:00
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@@ -3,12 +3,12 @@
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
<!-- 2019-04-15 lun. 13:12 -->
<!-- 2019-05-14 mar. 23:06 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Measurements</title>
<meta name="generator" content="Org mode" />
<meta name="author" content="Thomas Dehaeze" />
<meta name="author" content="Dehaeze Thomas" />
<style type="text/css">
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.title { text-align: center;
@@ -195,10 +195,11 @@
</style>
<link rel="stylesheet" type="text/css" href="../css/htmlize.css"/>
<link rel="stylesheet" type="text/css" href="../css/readtheorg.css"/>
<script src="../js/jquery.min.js"></script>
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@@ -247,49 +248,92 @@ for the JavaScript code in this tag.
</script>
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<body>
<div id="content">
<div id="org-div-home-and-up">
<a accesskey="h" href="../index.html"> UP </a>
|
<a accesskey="H" href="../index.html"> HOME </a>
</div><div id="content">
<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="#orga614698">1. Experimental conditions</a></li>
<li><a href="#org5acf69f">2. Measurements procedure</a></li>
<li><a href="#orge8576dc">3. Measurement Channels</a></li>
<li><a href="#org2abc3a7">4. Experiments</a></li>
<li><a href="#org4e35b4e">5. Data Analysis</a>
<li><a href="#org27cbd90">1. Experimental conditions</a></li>
<li><a href="#orgf2bb684">2. Measurements procedure</a></li>
<li><a href="#org604de72">3. Measurement Channels</a></li>
<li><a href="#orgee6f009">4. Experiments</a></li>
<li><a href="#orgc91528e">5. Data Analysis</a>
<ul>
<li><a href="#orgaf82586">5.1. Loading and pre-processing of the data</a></li>
<li><a href="#orgc8844c5">5.2. X-direction FRF</a></li>
<li><a href="#orgcf9ba27">5.3. Y-direction FRF</a></li>
<li><a href="#org482e0e7">5.4. Z-direction FRF</a></li>
<li><a href="#org64c9d55">5.1. Loading and pre-processing of the data</a></li>
<li><a href="#org528d8bd">5.2. X-direction FRF</a></li>
<li><a href="#orgb043f14">5.3. Y-direction FRF</a></li>
<li><a href="#org63f36f4">5.4. Z-direction FRF</a></li>
<li><a href="#org9fd4cff">5.5. Save the processed data</a></li>
</ul>
</li>
<li><a href="#orge5ef1a0">6. Results</a></li>
</ul>
</div>
</div>
<p>
<a href="../index.html">Back to main page</a>.
</p>
<div id="outline-container-orga614698" class="outline-2">
<h2 id="orga614698"><span class="section-number-2">1</span> Experimental conditions</h2>
<div id="outline-container-org27cbd90" class="outline-2">
<h2 id="org27cbd90"><span class="section-number-2">1</span> Experimental conditions</h2>
<div class="outline-text-2" id="text-1">
<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">2018-01-12</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">Laboratory</td>
</tr>
<tr>
<td class="org-left"><b>Notes</b></td>
<td class="org-left">Unglued Granite</td>
</tr>
</tbody>
</table>
<ul class="org-ul">
<li>The granite is not glued to the floor</li>
<li>FS = 512Hz</li>
<li>Made by Marc Lesourd on the 12 of January 2018</li>
</ul>
<p>
<b>Goal</b>:
Obtain better coherence at low frequency.
</p>
</div>
</div>
<div id="outline-container-org5acf69f" class="outline-2">
<h2 id="org5acf69f"><span class="section-number-2">2</span> Measurements procedure</h2>
<div id="outline-container-orgf2bb684" class="outline-2">
<h2 id="orgf2bb684"><span class="section-number-2">2</span> Measurements procedure</h2>
<div class="outline-text-2" id="text-2">
<p>
<b>Geophones</b>
L-28LB geophones (table <a href="#org3345ea9">1</a>) are placed on
L-28LB geophones (table <a href="#org27c9f01">1</a>) are placed on
</p>
<ul class="org-ul">
<li>Marle</li>
@@ -297,7 +341,7 @@ L-28LB geophones (table <a href="#org3345ea9">1</a>) are placed on
<li>Top of Hexapod</li>
</ul>
<table id="org3345ea9" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<table id="org27c9f01" 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>
@@ -333,10 +377,10 @@ The structure is excited using an <b>instrumented hammer</b> with impacts on
</div>
</div>
<div id="outline-container-orge8576dc" class="outline-2">
<h2 id="orge8576dc"><span class="section-number-2">3</span> Measurement Channels</h2>
<div id="outline-container-org604de72" class="outline-2">
<h2 id="org604de72"><span class="section-number-2">3</span> Measurement Channels</h2>
<div class="outline-text-2" id="text-3">
<table id="org462ede7" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<table id="org98c14df" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 2:</span> Description of each measurement channel</caption>
<colgroup>
@@ -390,10 +434,10 @@ The structure is excited using an <b>instrumented hammer</b> with impacts on
</div>
</div>
<div id="outline-container-org2abc3a7" class="outline-2">
<h2 id="org2abc3a7"><span class="section-number-2">4</span> Experiments</h2>
<div id="outline-container-orgee6f009" class="outline-2">
<h2 id="orgee6f009"><span class="section-number-2">4</span> Experiments</h2>
<div class="outline-text-2" id="text-4">
<table id="orgf9904be" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<table id="orgd57c63a" border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 3:</span> Description of the location of direction of the excitation for each measurement</caption>
<colgroup>
@@ -453,12 +497,12 @@ The structure is excited using an <b>instrumented hammer</b> with impacts on
</div>
</div>
<div id="outline-container-org4e35b4e" class="outline-2">
<h2 id="org4e35b4e"><span class="section-number-2">5</span> Data Analysis</h2>
<div id="outline-container-orgc91528e" class="outline-2">
<h2 id="orgc91528e"><span class="section-number-2">5</span> Data Analysis</h2>
<div class="outline-text-2" id="text-5">
</div>
<div id="outline-container-orgaf82586" class="outline-3">
<h3 id="orgaf82586"><span class="section-number-3">5.1</span> Loading and pre-processing of the data</h3>
<div id="outline-container-org64c9d55" class="outline-3">
<h3 id="org64c9d55"><span class="section-number-3">5.1</span> Loading and pre-processing of the data</h3>
<div class="outline-text-3" id="text-5-1">
<p>
The Geophone sensitivity is defined below:
@@ -467,7 +511,7 @@ The Geophone sensitivity is defined below:
<pre class="src src-matlab">w0 = <span class="org-highlight-numbers-number">4</span>.<span class="org-highlight-numbers-number">5</span><span class="org-type">*</span><span class="org-highlight-numbers-number">2</span><span class="org-type">*</span><span class="org-constant">pi</span>; <span class="org-comment">% [rad/s]</span>
ksi = <span class="org-highlight-numbers-number">0</span>.<span class="org-highlight-numbers-number">38</span>;
G0 = <span class="org-highlight-numbers-number">31</span>.<span class="org-highlight-numbers-number">3</span>; <span class="org-comment">% [V/(m/s)]</span>
[Omitted long matching line]
G = G0<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">(</span>s<span class="org-type">/</span>w0<span class="org-rainbow-delimiters-depth-1">)</span><span class="org-type">^</span><span class="org-highlight-numbers-number">2</span><span class="org-type">/</span><span class="org-rainbow-delimiters-depth-1">(</span><span class="org-rainbow-delimiters-depth-2">(</span>s<span class="org-type">/</span>w0<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-type">^</span><span class="org-highlight-numbers-number">2</span> <span class="org-type">+</span> <span class="org-highlight-numbers-number">2</span><span class="org-type">*</span>ksi<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-2">(</span>s<span class="org-type">/</span>w0<span class="org-rainbow-delimiters-depth-2">)</span> <span class="org-type">+</span> <span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-1">)</span>; <span class="org-comment">% [V/(m/s)]</span>
</pre>
</div>
@@ -563,19 +607,83 @@ coh_hexa_z<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-
coh_hexa_z<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-type">:</span>, <span class="org-highlight-numbers-number">3</span><span class="org-rainbow-delimiters-depth-1">)</span> = coh6<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-type">:</span>, <span class="org-highlight-numbers-number">4</span><span class="org-rainbow-delimiters-depth-1">)</span>; <span class="org-comment">% hexa_z</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org528d8bd" class="outline-3">
<h3 id="org528d8bd"><span class="section-number-3">5.2</span> X-direction FRF</h3>
<div class="outline-text-3" id="text-5-2">
<div id="orgbe46711" class="figure">
<p><img src="figs/marble_x_frf.png" alt="marble_x_frf.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Response to a force applied on the marble in the X direction</p>
</div>
<div id="org4005c39" class="figure">
<p><img src="figs/hexa_x_frf.png" alt="hexa_x_frf.png" />
</p>
<p><span class="figure-number">Figure 2: </span>Response to a force applied on the hexa in the X direction</p>
</div>
</div>
</div>
<div id="outline-container-orgb043f14" class="outline-3">
<h3 id="orgb043f14"><span class="section-number-3">5.3</span> Y-direction FRF</h3>
<div class="outline-text-3" id="text-5-3">
<div id="org959d073" class="figure">
<p><img src="figs/marble_y_frf.png" alt="marble_y_frf.png" />
</p>
<p><span class="figure-number">Figure 3: </span>Response to a force applied on the marble in the Y direction</p>
</div>
<div id="orge15a0ff" class="figure">
<p><img src="figs/hexa_y_frf.png" alt="hexa_y_frf.png" />
</p>
<p><span class="figure-number">Figure 4: </span>Response to a force applied on the hexa in the Y direction</p>
</div>
</div>
</div>
<div id="outline-container-org63f36f4" class="outline-3">
<h3 id="org63f36f4"><span class="section-number-3">5.4</span> Z-direction FRF</h3>
<div class="outline-text-3" id="text-5-4">
<div id="orgf2ca329" class="figure">
<p><img src="figs/marble_z_frf.png" alt="marble_z_frf.png" />
</p>
<p><span class="figure-number">Figure 5: </span>Response to a force applied on the marble in the Z direction</p>
</div>
<div id="orgbb33b62" class="figure">
<p><img src="figs/hexa_z_frf.png" alt="hexa_z_frf.png" />
</p>
<p><span class="figure-number">Figure 6: </span>Response to a force applied on the hexa in the Z direction</p>
</div>
</div>
</div>
<div id="outline-container-org9fd4cff" class="outline-3">
<h3 id="org9fd4cff"><span class="section-number-3">5.5</span> Save the processed data</h3>
<div class="outline-text-3" id="text-5-5">
<p>
Finally, we save the processed data.
</p>
<div class="org-src-container">
<pre class="src src-matlab">save<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-string">'./data/id31_microstation_2018_01_12_frf.mat'</span>, <span class="org-underline">...</span>
<span class="org-string">'freq_frf'</span>, <span class="org-underline">...</span>
<span class="org-string">'frf_marble_x'</span>, <span class="org-underline">...</span>
<span class="org-string">'frf_marble_y'</span>, <span class="org-underline">...</span>
<span class="org-string">'frf_marble_z'</span>, <span class="org-underline">...</span>
<span class="org-string">'frf_hexa_x'</span>, <span class="org-underline">...</span>
<span class="org-string">'frf_hexa_y'</span>, <span class="org-underline">...</span>
<span class="org-string">'frf_hexa_z'</span><span class="org-rainbow-delimiters-depth-1">)</span>;
save<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-string">'./data/id31_microstation_2018_01_12_frf.mat'</span>, <span class="org-underline">...</span>
save<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-string">'./data/id31_microstation_2018_01_12_coh.mat'</span>, <span class="org-underline">...</span>
<span class="org-string">'freq_frf'</span>, <span class="org-underline">...</span>
<span class="org-string">'coh_marble_x'</span>, <span class="org-underline">...</span>
<span class="org-string">'coh_marble_y'</span>, <span class="org-underline">...</span>
<span class="org-string">'coh_marble_z'</span>, <span class="org-underline">...</span>
@@ -586,69 +694,23 @@ save<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-string
</div>
</div>
</div>
<div id="outline-container-orgc8844c5" class="outline-3">
<h3 id="orgc8844c5"><span class="section-number-3">5.2</span> X-direction FRF</h3>
<div class="outline-text-3" id="text-5-2">
<div id="org46ec177" class="figure">
<p><img src="figs/marble_x_frf.png" alt="marble_x_frf.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Response to a force applied on the marble in the X direction</p>
</div>
<div id="outline-container-orge5ef1a0" class="outline-2">
<h2 id="orge5ef1a0"><span class="section-number-2">6</span> Results</h2>
<div class="outline-text-2" id="text-6">
<div class="important">
<ul class="org-ul">
<li>Resonances at 42Hz, 70Hz and 125Hz have been identified</li>
<li>The coherence is much better than when using accelerometers</li>
</ul>
<div id="org1e4d82b" class="figure">
<p><img src="figs/hexa_x_frf.png" alt="hexa_x_frf.png" />
</p>
<p><span class="figure-number">Figure 2: </span>Response to a force applied on the hexa in the X direction</p>
</div>
</div>
</div>
<div id="outline-container-orgcf9ba27" class="outline-3">
<h3 id="orgcf9ba27"><span class="section-number-3">5.3</span> Y-direction FRF</h3>
<div class="outline-text-3" id="text-5-3">
<div id="org259229b" class="figure">
<p><img src="figs/marble_y_frf.png" alt="marble_y_frf.png" />
</p>
<p><span class="figure-number">Figure 3: </span>Response to a force applied on the marble in the Y direction</p>
</div>
<div id="org24e7d47" class="figure">
<p><img src="figs/hexa_y_frf.png" alt="hexa_y_frf.png" />
</p>
<p><span class="figure-number">Figure 4: </span>Response to a force applied on the hexa in the Y direction</p>
</div>
</div>
</div>
<div id="outline-container-org482e0e7" class="outline-3">
<h3 id="org482e0e7"><span class="section-number-3">5.4</span> Z-direction FRF</h3>
<div class="outline-text-3" id="text-5-4">
<div id="orgd52f782" class="figure">
<p><img src="figs/marble_z_frf.png" alt="marble_z_frf.png" />
</p>
<p><span class="figure-number">Figure 5: </span>Response to a force applied on the marble in the Z direction</p>
</div>
<div id="org142632b" class="figure">
<p><img src="figs/hexa_z_frf.png" alt="hexa_z_frf.png" />
</p>
<p><span class="figure-number">Figure 6: </span>Response to a force applied on the hexa in the Z direction</p>
</div>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Thomas Dehaeze</p>
<p class="date">Created: 2019-04-15 lun. 13:12</p>
<p class="author">Author: Dehaeze Thomas</p>
<p class="date">Created: 2019-05-14 mar. 23:06</p>
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>

15
2018-01-12 - Marc/index.org
View File

@@ -30,10 +30,20 @@
:END:
* Experimental conditions
| *Date* | 2018-01-12 |
| *Sensors* | Geophones |
| *Excitation* | Instrumented Hammer |
| *Location* | Laboratory |
| *Notes* | Unglued Granite |
- The granite is not glued to the floor
- FS = 512Hz
- Made by Marc Lesourd on the 12 of January 2018
*Goal*:
Obtain better coherence at low frequency.
* Measurements procedure
*Geophones*
L-28LB geophones (table [[tab:L-28LB]]) are placed on
@@ -348,3 +358,8 @@ Finally, we save the processed data.
'coh_hexa_y', ...
'coh_hexa_z');
#+end_src
* Results
#+begin_important
- Resonances at 42Hz, 70Hz and 125Hz have been identified
- The coherence is much better than when using accelerometers
#+end_important