Update few figures
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<head>
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<!-- 2020-07-24 ven. 13:16 -->
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<!-- 2020-07-24 ven. 15:48 -->
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
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<title>Test Bench APA95ML</title>
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<meta name="generator" content="Org mode" />
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@ -27,42 +27,42 @@
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<h2>Table of Contents</h2>
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<div id="text-table-of-contents">
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<ul>
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<li><a href="#org9f7598b">1. Setup</a>
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<li><a href="#orgde2ca90">1. Setup</a>
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||||
<ul>
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||||
<li><a href="#org7edfb65">1.1. Parameters</a></li>
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||||
<li><a href="#orgdac636f">1.2. Filter White Noise</a></li>
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||||
<li><a href="#orgc62d598">1.1. Parameters</a></li>
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||||
<li><a href="#org128d329">1.2. Filter White Noise</a></li>
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||||
</ul>
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||||
</li>
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||||
<li><a href="#org756b658">2. Run Experiment and Save Data</a>
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||||
<li><a href="#orga229608">2. Run Experiment and Save Data</a>
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||||
<ul>
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||||
<li><a href="#org14764c7">2.1. Load Data</a></li>
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||||
<li><a href="#org1b77b38">2.2. Save Data</a></li>
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||||
<li><a href="#org117998a">2.1. Load Data</a></li>
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||||
<li><a href="#org0aec1ce">2.2. Save Data</a></li>
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||||
</ul>
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||||
</li>
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||||
<li><a href="#org28cccdb">3. Huddle Test</a>
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<li><a href="#orge436fe5">3. Huddle Test</a>
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<ul>
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<li><a href="#org305cdf5">3.1. Time Domain Data</a></li>
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||||
<li><a href="#orga153e30">3.2. PSD of Measurement Noise</a></li>
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||||
<li><a href="#orga50e600">3.1. Time Domain Data</a></li>
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||||
<li><a href="#org6637acb">3.2. PSD of Measurement Noise</a></li>
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||||
</ul>
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||||
</li>
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<li><a href="#orgfa9bec6">4. Transfer Function Estimation using the DAC as the driver</a>
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<li><a href="#org1e70b14">4. Transfer Function Estimation using the DAC as the driver</a>
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<ul>
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<li><a href="#org99e40a8">4.1. Time Domain Data</a></li>
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||||
<li><a href="#org45d7543">4.2. Comparison of the PSD with Huddle Test</a></li>
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||||
<li><a href="#org5dbdfb4">4.3. Compute TF estimate and Coherence</a></li>
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||||
<li><a href="#org3e7c447">4.4. Comparison with the FEM model</a></li>
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||||
<li><a href="#org627cdd4">4.1. Time Domain Data</a></li>
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||||
<li><a href="#orgb2e3ad4">4.2. Comparison of the PSD with Huddle Test</a></li>
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||||
<li><a href="#orgd81c13d">4.3. Compute TF estimate and Coherence</a></li>
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||||
<li><a href="#org7b450ca">4.4. Comparison with the FEM model</a></li>
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||||
</ul>
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||||
</li>
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||||
<li><a href="#org000ddf1">5. Transfer Function Estimation using the PI Amplifier</a>
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||||
<li><a href="#orgf7b3cee">5. Transfer Function Estimation using the PI Amplifier</a>
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||||
<ul>
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<li><a href="#org110d884">5.1. Comparison of the PSD with Huddle Test</a></li>
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<li><a href="#org0df7f2a">5.2. Compute TF estimate and Coherence</a></li>
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<li><a href="#org0580b12">5.3. Comparison with the FEM model</a></li>
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||||
<li><a href="#orgd96ab97">5.1. Comparison of the PSD with Huddle Test</a></li>
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<li><a href="#orgf49c967">5.2. Compute TF estimate and Coherence</a></li>
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<li><a href="#orgeb00ff9">5.3. Comparison with the FEM model</a></li>
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</ul>
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</li>
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<li><a href="#orgeedd2b2">6. Transfer function of the PI Amplifier</a>
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<li><a href="#org0baf7a6">6. Transfer function of the PI Amplifier</a>
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<ul>
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<li><a href="#org337f0dd">6.1. Compute TF estimate and Coherence</a></li>
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<li><a href="#org94a6d47">6.1. Compute TF estimate and Coherence</a></li>
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</ul>
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</li>
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</ul>
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@ -70,26 +70,26 @@
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</div>
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<div id="orge2005b9" class="figure">
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<div id="orgfac2673" class="figure">
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||||
<p><img src="figs/setup_picture.png" alt="setup_picture.png" />
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</p>
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<p><span class="figure-number">Figure 1: </span>Picture of the Setup</p>
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</div>
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<div id="org6bde75b" class="figure">
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<div id="orgd8fb946" class="figure">
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<p><img src="figs/setup_zoom.png" alt="setup_zoom.png" />
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</p>
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<p><span class="figure-number">Figure 2: </span>Zoom on the APA</p>
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</div>
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<div id="outline-container-org9f7598b" class="outline-2">
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<h2 id="org9f7598b"><span class="section-number-2">1</span> Setup</h2>
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||||
<div id="outline-container-orgde2ca90" class="outline-2">
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||||
<h2 id="orgde2ca90"><span class="section-number-2">1</span> Setup</h2>
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||||
<div class="outline-text-2" id="text-1">
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||||
</div>
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||||
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||||
<div id="outline-container-org7edfb65" class="outline-3">
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||||
<h3 id="org7edfb65"><span class="section-number-3">1.1</span> Parameters</h3>
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||||
<div id="outline-container-orgc62d598" class="outline-3">
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||||
<h3 id="orgc62d598"><span class="section-number-3">1.1</span> Parameters</h3>
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<div class="outline-text-3" id="text-1-1">
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||||
<div class="org-src-container">
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<pre class="src src-matlab">Ts = 1e-4;
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@ -98,8 +98,8 @@
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</div>
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</div>
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||||
<div id="outline-container-orgdac636f" class="outline-3">
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||||
<h3 id="orgdac636f"><span class="section-number-3">1.2</span> Filter White Noise</h3>
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||||
<div id="outline-container-org128d329" class="outline-3">
|
||||
<h3 id="org128d329"><span class="section-number-3">1.2</span> Filter White Noise</h3>
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||||
<div class="outline-text-3" id="text-1-2">
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||||
<div class="org-src-container">
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||||
<pre class="src src-matlab">Glpf = 1/(1 + s/2/pi/500);
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@ -111,13 +111,13 @@ Gz = c2d(Glpf, Ts, 'tustin');
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</div>
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||||
</div>
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||||
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||||
<div id="outline-container-org756b658" class="outline-2">
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||||
<h2 id="org756b658"><span class="section-number-2">2</span> Run Experiment and Save Data</h2>
|
||||
<div id="outline-container-orga229608" class="outline-2">
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||||
<h2 id="orga229608"><span class="section-number-2">2</span> Run Experiment and Save Data</h2>
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||||
<div class="outline-text-2" id="text-2">
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||||
</div>
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||||
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||||
<div id="outline-container-org14764c7" class="outline-3">
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||||
<h3 id="org14764c7"><span class="section-number-3">2.1</span> Load Data</h3>
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||||
<div id="outline-container-org117998a" class="outline-3">
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||||
<h3 id="org117998a"><span class="section-number-3">2.1</span> Load Data</h3>
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||||
<div class="outline-text-3" id="text-2-1">
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<div class="org-src-container">
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||||
<pre class="src src-matlab">data = SimulinkRealTime.utils.getFileScopeData('data/apa95ml.dat').data;
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@ -126,8 +126,8 @@ Gz = c2d(Glpf, Ts, 'tustin');
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</div>
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||||
</div>
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||||
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||||
<div id="outline-container-org1b77b38" class="outline-3">
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||||
<h3 id="org1b77b38"><span class="section-number-3">2.2</span> Save Data</h3>
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||||
<div id="outline-container-org0aec1ce" class="outline-3">
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||||
<h3 id="org0aec1ce"><span class="section-number-3">2.2</span> Save Data</h3>
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||||
<div class="outline-text-3" id="text-2-2">
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||||
<div class="org-src-container">
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||||
<pre class="src src-matlab">u = data(:, 1); % Input Voltage [V]
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@ -144,16 +144,16 @@ t = data(:, 3); % Time [s]
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</div>
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||||
</div>
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||||
<div id="outline-container-org28cccdb" class="outline-2">
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||||
<h2 id="org28cccdb"><span class="section-number-2">3</span> Huddle Test</h2>
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||||
<div id="outline-container-orge436fe5" class="outline-2">
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||||
<h2 id="orge436fe5"><span class="section-number-2">3</span> Huddle Test</h2>
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||||
<div class="outline-text-2" id="text-3">
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||||
</div>
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||||
|
||||
<div id="outline-container-org305cdf5" class="outline-3">
|
||||
<h3 id="org305cdf5"><span class="section-number-3">3.1</span> Time Domain Data</h3>
|
||||
<div id="outline-container-orga50e600" class="outline-3">
|
||||
<h3 id="orga50e600"><span class="section-number-3">3.1</span> Time Domain Data</h3>
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||||
<div class="outline-text-3" id="text-3-1">
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||||
|
||||
<div id="org36d78b8" class="figure">
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||||
<div id="org9f3cece" class="figure">
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||||
<p><img src="figs/huddle_test_time_domain.png" alt="huddle_test_time_domain.png" />
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||||
</p>
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||||
<p><span class="figure-number">Figure 3: </span>Measurement of the Mass displacement during Huddle Test</p>
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||||
@ -161,8 +161,8 @@ t = data(:, 3); % Time [s]
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||||
</div>
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||||
</div>
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||||
|
||||
<div id="outline-container-orga153e30" class="outline-3">
|
||||
<h3 id="orga153e30"><span class="section-number-3">3.2</span> PSD of Measurement Noise</h3>
|
||||
<div id="outline-container-org6637acb" class="outline-3">
|
||||
<h3 id="org6637acb"><span class="section-number-3">3.2</span> PSD of Measurement Noise</h3>
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||||
<div class="outline-text-3" id="text-3-2">
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||||
<div class="org-src-container">
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||||
<pre class="src src-matlab">Ts = t(end)/(length(t)-1);
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@ -173,12 +173,12 @@ win = hanning(ceil(1*Fs));
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</div>
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||||
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||||
<div class="org-src-container">
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||||
<pre class="src src-matlab">[pxx, f] = pwelch(y, win, [], [], Fs);
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||||
<pre class="src src-matlab">[pxx, f] = pwelch(y(1000:end), win, [], [], Fs);
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||||
</pre>
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||||
</div>
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||||
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||||
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||||
<div id="org7a9dd6a" class="figure">
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||||
<div id="org53e3466" class="figure">
|
||||
<p><img src="figs/huddle_test_pdf.png" alt="huddle_test_pdf.png" />
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||||
</p>
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||||
<p><span class="figure-number">Figure 4: </span>Amplitude Spectral Density of the Displacement during Huddle Test</p>
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||||
@ -187,16 +187,16 @@ win = hanning(ceil(1*Fs));
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</div>
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||||
</div>
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||||
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||||
<div id="outline-container-orgfa9bec6" class="outline-2">
|
||||
<h2 id="orgfa9bec6"><span class="section-number-2">4</span> Transfer Function Estimation using the DAC as the driver</h2>
|
||||
<div id="outline-container-org1e70b14" class="outline-2">
|
||||
<h2 id="org1e70b14"><span class="section-number-2">4</span> Transfer Function Estimation using the DAC as the driver</h2>
|
||||
<div class="outline-text-2" id="text-4">
|
||||
</div>
|
||||
|
||||
<div id="outline-container-org99e40a8" class="outline-3">
|
||||
<h3 id="org99e40a8"><span class="section-number-3">4.1</span> Time Domain Data</h3>
|
||||
<div id="outline-container-org627cdd4" class="outline-3">
|
||||
<h3 id="org627cdd4"><span class="section-number-3">4.1</span> Time Domain Data</h3>
|
||||
<div class="outline-text-3" id="text-4-1">
|
||||
|
||||
<div id="org3c8d797" class="figure">
|
||||
<div id="orga0b06b8" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_10V_time_domain.png" alt="apa95ml_5kg_10V_time_domain.png" />
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||||
</p>
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||||
<p><span class="figure-number">Figure 5: </span>Time domain signals during the test</p>
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||||
@ -204,8 +204,8 @@ win = hanning(ceil(1*Fs));
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||||
</div>
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||||
</div>
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||||
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||||
<div id="outline-container-org45d7543" class="outline-3">
|
||||
<h3 id="org45d7543"><span class="section-number-3">4.2</span> Comparison of the PSD with Huddle Test</h3>
|
||||
<div id="outline-container-orgb2e3ad4" class="outline-3">
|
||||
<h3 id="orgb2e3ad4"><span class="section-number-3">4.2</span> Comparison of the PSD with Huddle Test</h3>
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||||
<div class="outline-text-3" id="text-4-2">
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||||
<div class="org-src-container">
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||||
<pre class="src src-matlab">Ts = t(end)/(length(t)-1);
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@ -222,7 +222,7 @@ win = hanning(ceil(1*Fs));
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</div>
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||||
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<div id="org15f2486" class="figure">
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||||
<div id="org8170f8d" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_10V_pdf_comp_huddle.png" alt="apa95ml_5kg_10V_pdf_comp_huddle.png" />
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||||
</p>
|
||||
<p><span class="figure-number">Figure 6: </span>Comparison of the ASD for the identification test and the huddle test</p>
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||||
@ -230,8 +230,8 @@ win = hanning(ceil(1*Fs));
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||||
</div>
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||||
</div>
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||||
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||||
<div id="outline-container-org5dbdfb4" class="outline-3">
|
||||
<h3 id="org5dbdfb4"><span class="section-number-3">4.3</span> Compute TF estimate and Coherence</h3>
|
||||
<div id="outline-container-orgd81c13d" class="outline-3">
|
||||
<h3 id="orgd81c13d"><span class="section-number-3">4.3</span> Compute TF estimate and Coherence</h3>
|
||||
<div class="outline-text-3" id="text-4-3">
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||||
<div class="org-src-container">
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||||
<pre class="src src-matlab">Ts = t(end)/(length(t)-1);
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@ -248,14 +248,14 @@ Fs = 1/Ts;
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||||
</div>
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||||
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||||
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||||
<div id="org22a86fd" class="figure">
|
||||
<div id="orgb44ea20" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_10V_coh.png" alt="apa95ml_5kg_10V_coh.png" />
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||||
</p>
|
||||
<p><span class="figure-number">Figure 7: </span>Coherence</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div id="org70b1269" class="figure">
|
||||
<div id="org0f7463c" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_10V_tf.png" alt="apa95ml_5kg_10V_tf.png" />
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||||
</p>
|
||||
<p><span class="figure-number">Figure 8: </span>Estimation of the transfer function from input voltage to displacement</p>
|
||||
@ -263,8 +263,8 @@ Fs = 1/Ts;
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||||
</div>
|
||||
</div>
|
||||
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||||
<div id="outline-container-org3e7c447" class="outline-3">
|
||||
<h3 id="org3e7c447"><span class="section-number-3">4.4</span> Comparison with the FEM model</h3>
|
||||
<div id="outline-container-org7b450ca" class="outline-3">
|
||||
<h3 id="org7b450ca"><span class="section-number-3">4.4</span> Comparison with the FEM model</h3>
|
||||
<div class="outline-text-3" id="text-4-4">
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-matlab">load('mat/fem_model_5kg.mat', 'Ghm');
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@ -272,7 +272,7 @@ Fs = 1/Ts;
|
||||
</div>
|
||||
|
||||
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||||
<div id="org1d338bc" class="figure">
|
||||
<div id="orgbdfdc24" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_comp_fem.png" alt="apa95ml_5kg_comp_fem.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 9: </span>Comparison of the identified transfer function and the one estimated from the FE model</p>
|
||||
@ -291,12 +291,12 @@ In the next section, a current amplifier is used.
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div id="outline-container-org000ddf1" class="outline-2">
|
||||
<h2 id="org000ddf1"><span class="section-number-2">5</span> Transfer Function Estimation using the PI Amplifier</h2>
|
||||
<div id="outline-container-orgf7b3cee" class="outline-2">
|
||||
<h2 id="orgf7b3cee"><span class="section-number-2">5</span> Transfer Function Estimation using the PI Amplifier</h2>
|
||||
<div class="outline-text-2" id="text-5">
|
||||
</div>
|
||||
<div id="outline-container-org110d884" class="outline-3">
|
||||
<h3 id="org110d884"><span class="section-number-3">5.1</span> Comparison of the PSD with Huddle Test</h3>
|
||||
<div id="outline-container-orgd96ab97" class="outline-3">
|
||||
<h3 id="orgd96ab97"><span class="section-number-3">5.1</span> Comparison of the PSD with Huddle Test</h3>
|
||||
<div class="outline-text-3" id="text-5-1">
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-matlab">Ts = t(end)/(length(t)-1);
|
||||
@ -313,7 +313,7 @@ win = hanning(ceil(1*Fs));
|
||||
</div>
|
||||
|
||||
|
||||
<div id="org4f7b784" class="figure">
|
||||
<div id="orgbc7a9a7" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_PI_pdf_comp_huddle.png" alt="apa95ml_5kg_PI_pdf_comp_huddle.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 10: </span>Comparison of the ASD for the identification test and the huddle test</p>
|
||||
@ -321,8 +321,8 @@ win = hanning(ceil(1*Fs));
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div id="outline-container-org0df7f2a" class="outline-3">
|
||||
<h3 id="org0df7f2a"><span class="section-number-3">5.2</span> Compute TF estimate and Coherence</h3>
|
||||
<div id="outline-container-orgf49c967" class="outline-3">
|
||||
<h3 id="orgf49c967"><span class="section-number-3">5.2</span> Compute TF estimate and Coherence</h3>
|
||||
<div class="outline-text-3" id="text-5-2">
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-matlab">Ts = t(end)/(length(t)-1);
|
||||
@ -340,14 +340,14 @@ Fs = 1/Ts;
|
||||
</div>
|
||||
|
||||
|
||||
<div id="org99498ae" class="figure">
|
||||
<div id="org883cf4f" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_PI_coh.png" alt="apa95ml_5kg_PI_coh.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 11: </span>Coherence</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div id="org554203c" class="figure">
|
||||
<div id="orgefbbeeb" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_PI_tf.png" alt="apa95ml_5kg_PI_tf.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 12: </span>Estimation of the transfer function from input voltage to displacement</p>
|
||||
@ -355,8 +355,8 @@ Fs = 1/Ts;
|
||||
</div>
|
||||
</div>
|
||||
|
||||
<div id="outline-container-org0580b12" class="outline-3">
|
||||
<h3 id="org0580b12"><span class="section-number-3">5.3</span> Comparison with the FEM model</h3>
|
||||
<div id="outline-container-orgeb00ff9" class="outline-3">
|
||||
<h3 id="orgeb00ff9"><span class="section-number-3">5.3</span> Comparison with the FEM model</h3>
|
||||
<div class="outline-text-3" id="text-5-3">
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-matlab">load('mat/fem_model_5kg.mat', 'Ghm');
|
||||
@ -364,7 +364,7 @@ Fs = 1/Ts;
|
||||
</div>
|
||||
|
||||
|
||||
<div id="org001e611" class="figure">
|
||||
<div id="orgfd1fd2d" class="figure">
|
||||
<p><img src="figs/apa95ml_5kg_pi_comp_fem.png" alt="apa95ml_5kg_pi_comp_fem.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 13: </span>Comparison of the identified transfer function and the one estimated from the FE model</p>
|
||||
@ -372,12 +372,12 @@ Fs = 1/Ts;
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div id="outline-container-orgeedd2b2" class="outline-2">
|
||||
<h2 id="orgeedd2b2"><span class="section-number-2">6</span> Transfer function of the PI Amplifier</h2>
|
||||
<div id="outline-container-org0baf7a6" class="outline-2">
|
||||
<h2 id="org0baf7a6"><span class="section-number-2">6</span> Transfer function of the PI Amplifier</h2>
|
||||
<div class="outline-text-2" id="text-6">
|
||||
</div>
|
||||
<div id="outline-container-org337f0dd" class="outline-3">
|
||||
<h3 id="org337f0dd"><span class="section-number-3">6.1</span> Compute TF estimate and Coherence</h3>
|
||||
<div id="outline-container-org94a6d47" class="outline-3">
|
||||
<h3 id="org94a6d47"><span class="section-number-3">6.1</span> Compute TF estimate and Coherence</h3>
|
||||
<div class="outline-text-3" id="text-6-1">
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-matlab">Ts = t(end)/(length(t)-1);
|
||||
@ -390,11 +390,11 @@ The coherence and the transfer function are estimate from the voltage input of t
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The coherence is very good as expected (Figure <a href="#orgd06642a">14</a>).
|
||||
The coherence is very good as expected (Figure <a href="#org12654c2">14</a>).
|
||||
</p>
|
||||
|
||||
<p>
|
||||
The transfer function show a low pass filter behavior with a lot of phase drop (Figure <a href="#orgcc39578">15</a>).
|
||||
The transfer function show a low pass filter behavior with a lot of phase drop (Figure <a href="#org23ba982">15</a>).
|
||||
</p>
|
||||
|
||||
<div class="org-src-container">
|
||||
@ -406,37 +406,42 @@ The transfer function show a low pass filter behavior with a lot of phase drop (
|
||||
</div>
|
||||
|
||||
|
||||
<div id="orgd06642a" class="figure">
|
||||
<div id="org12654c2" class="figure">
|
||||
<p><img src="figs/PI_E505_coh.png" alt="PI_E505_coh.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 14: </span>Coherence</p>
|
||||
</div>
|
||||
|
||||
|
||||
<div id="orgcc39578" class="figure">
|
||||
<div id="org23ba982" class="figure">
|
||||
<p><img src="figs/PI_E505_tf.png" alt="PI_E505_tf.png" />
|
||||
</p>
|
||||
<p><span class="figure-number">Figure 15: </span>Estimation of the transfer function from input voltage to displacement</p>
|
||||
</div>
|
||||
|
||||
<p>
|
||||
The delay can be estimated as follow:
|
||||
The delay can be estimated as follow (in ms):
|
||||
</p>
|
||||
<div class="org-src-container">
|
||||
<pre class="src src-matlab">finddelay(u, um)*Ts
|
||||
<pre class="src src-matlab">finddelay(u, um)*(1000*Ts)
|
||||
</pre>
|
||||
</div>
|
||||
|
||||
<pre class="example">
|
||||
0.0004
|
||||
0.4
|
||||
</pre>
|
||||
|
||||
|
||||
<p>
|
||||
This most probably corresponds to a FIR filter.
|
||||
</p>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div id="postamble" class="status">
|
||||
<p class="author">Author: Dehaeze Thomas</p>
|
||||
<p class="date">Created: 2020-07-24 ven. 13:16</p>
|
||||
<p class="date">Created: 2020-07-24 ven. 15:48</p>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
19
index.org
19
index.org
@ -108,13 +108,17 @@
|
||||
|
||||
** Load Data :noexport:
|
||||
#+begin_src matlab
|
||||
load('./mat/huddle_test.mat', 't', 'u', 'y');
|
||||
load('./mat/huddle_test.mat', 't', 'y');
|
||||
#+end_src
|
||||
|
||||
#+begin_src matlab
|
||||
y = y - mean(y(1000:end));
|
||||
#+end_src
|
||||
|
||||
** Time Domain Data
|
||||
#+begin_src matlab :exports none
|
||||
figure;
|
||||
plot(t, y)
|
||||
plot(t(1000:end), y(1000:end))
|
||||
ylabel('Output Displacement [m]'); xlabel('Time [s]');
|
||||
#+end_src
|
||||
|
||||
@ -136,7 +140,7 @@
|
||||
#+end_src
|
||||
|
||||
#+begin_src matlab
|
||||
[pxx, f] = pwelch(y, win, [], [], Fs);
|
||||
[pxx, f] = pwelch(y(1000:end), win, [], [], Fs);
|
||||
#+end_src
|
||||
|
||||
#+begin_src matlab :exports none
|
||||
@ -385,7 +389,7 @@ In the next section, a current amplifier is used.
|
||||
hold off;
|
||||
set(gca, 'XScale', 'log'); set(gca, 'YScale', 'log');
|
||||
xlabel('Frequency [Hz]'); ylabel('ASD [$m/\sqrt{Hz}$]');
|
||||
legend('location', 'northeast');
|
||||
legend('location', 'southwest');
|
||||
xlim([1, Fs/2]);
|
||||
#+end_src
|
||||
|
||||
@ -590,11 +594,12 @@ The transfer function show a low pass filter behavior with a lot of phase drop (
|
||||
#+RESULTS:
|
||||
[[file:figs/PI_E505_tf.png]]
|
||||
|
||||
The delay can be estimated as follow:
|
||||
The delay can be estimated as follow (in ms):
|
||||
#+begin_src matlab :results replace value
|
||||
finddelay(u, um)*Ts
|
||||
finddelay(u, um)*(1000*Ts)
|
||||
#+end_src
|
||||
|
||||
#+RESULTS:
|
||||
: 0.0004
|
||||
: 0.4
|
||||
|
||||
This most probably corresponds to a FIR filter.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user