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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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<title>Finite Element Model with Simscape</title>
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<meta name="author" content="Dehaeze Thomas" />
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<h1 class="title">Finite Element Model with Simscape</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
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<li><a href="#org677afcf">1. Amplified Piezoelectric Actuator - 3D elements</a>
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<ul>
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<li><a href="#org966ca11">1.1. Import Mass Matrix, Stiffness Matrix, and Interface Nodes Coordinates</a></li>
<li><a href="#org4f69d52">1.2. Identification of the Dynamics</a></li>
<li><a href="#orga73b4fa">1.3. Comparison with Ansys</a></li>
<li><a href="#org7e1d6fb">1.4. Force Sensor</a></li>
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</ul>
</li>
</ul>
</div>
</div>
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<div id="outline-container-org677afcf" class="outline-2">
<h2 id="org677afcf"><span class="section-number-2">1</span> Amplified Piezoelectric Actuator - 3D elements</h2>
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<div class="outline-text-2" id="text-1">
<p>
The idea here is to:
</p>
<ul class="org-ul">
<li>export a FEM of an amplified piezoelectric actuator from Ansys to Matlab</li>
<li>import it into a Simscape model</li>
<li>compare the obtained dynamics</li>
<li>add 10kg mass on top of the actuator and identify the dynamics</li>
<li>compare with results from Ansys where 10kg are directly added to the FEM</li>
</ul>
</div>
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<div id="outline-container-org966ca11" class="outline-3">
<h3 id="org966ca11"><span class="section-number-3">1.1</span> Import Mass Matrix, Stiffness Matrix, and Interface Nodes Coordinates</h3>
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<div class="outline-text-3" id="text-1-1">
<p>
We first extract the stiffness and mass matrices.
</p>
<div class="org-src-container">
<pre class="src src-matlab">K = extractMatrix('piezo_amplified_3d_K.txt');
M = extractMatrix('piezo_amplified_3d_M.txt');
</pre>
</div>
<p>
Then, we extract the coordinates of the interface nodes.
</p>
<div class="org-src-container">
<pre class="src src-matlab">[int_xyz, int_i, n_xyz, n_i, nodes] = extractNodes('piezo_amplified_3d.txt');
</pre>
</div>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<colgroup>
<col class="org-left" />
<col class="org-right" />
</colgroup>
<tbody>
<tr>
<td class="org-left">Total number of Nodes</td>
<td class="org-right">168959</td>
</tr>
<tr>
<td class="org-left">Number of interface Nodes</td>
<td class="org-right">13</td>
</tr>
<tr>
<td class="org-left">Number of Modes</td>
<td class="org-right">30</td>
</tr>
<tr>
<td class="org-left">Size of M and K matrices</td>
<td class="org-right">108</td>
</tr>
</tbody>
</table>
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<div id="orgb472295" class="figure">
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<p><img src="figs/amplified_piezo_interface_nodes.png" alt="amplified_piezo_interface_nodes.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Interface Nodes for the Amplified Piezo Actuator</p>
</div>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 1:</span> Coordinates of the interface nodes</caption>
<colgroup>
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
</colgroup>
<thead>
<tr>
<th scope="col" class="org-right">Node i</th>
<th scope="col" class="org-right">Node Number</th>
<th scope="col" class="org-right">x [m]</th>
<th scope="col" class="org-right">y [m]</th>
<th scope="col" class="org-right">z [m]</th>
</tr>
</thead>
<tbody>
<tr>
<td class="org-right">1.0</td>
<td class="org-right">168947.0</td>
<td class="org-right">0.0</td>
<td class="org-right">0.03</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">2.0</td>
<td class="org-right">168949.0</td>
<td class="org-right">0.0</td>
<td class="org-right">-0.03</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">3.0</td>
<td class="org-right">168950.0</td>
<td class="org-right">-0.035</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">4.0</td>
<td class="org-right">168951.0</td>
<td class="org-right">-0.028</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">5.0</td>
<td class="org-right">168952.0</td>
<td class="org-right">-0.021</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">6.0</td>
<td class="org-right">168953.0</td>
<td class="org-right">-0.014</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">7.0</td>
<td class="org-right">168954.0</td>
<td class="org-right">-0.007</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">8.0</td>
<td class="org-right">168955.0</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">9.0</td>
<td class="org-right">168956.0</td>
<td class="org-right">0.007</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">10.0</td>
<td class="org-right">168957.0</td>
<td class="org-right">0.014</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">11.0</td>
<td class="org-right">168958.0</td>
<td class="org-right">0.021</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">12.0</td>
<td class="org-right">168959.0</td>
<td class="org-right">0.035</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
<tr>
<td class="org-right">13.0</td>
<td class="org-right">168960.0</td>
<td class="org-right">0.028</td>
<td class="org-right">0.0</td>
<td class="org-right">0.0</td>
</tr>
</tbody>
</table>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 2:</span> First 10x10 elements of the Stiffness matrix</caption>
<colgroup>
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
</colgroup>
<tbody>
<tr>
<td class="org-right">300000000.0</td>
<td class="org-right">-30000.0</td>
<td class="org-right">8000.0</td>
<td class="org-right">-200.0</td>
<td class="org-right">-30.0</td>
<td class="org-right">-60000.0</td>
<td class="org-right">20000000.0</td>
<td class="org-right">-4000.0</td>
<td class="org-right">500.0</td>
<td class="org-right">8</td>
</tr>
<tr>
<td class="org-right">-30000.0</td>
<td class="org-right">100000000.0</td>
<td class="org-right">400.0</td>
<td class="org-right">30.0</td>
<td class="org-right">200.0</td>
<td class="org-right">-1</td>
<td class="org-right">4000.0</td>
<td class="org-right">-8000000.0</td>
<td class="org-right">800.0</td>
<td class="org-right">7</td>
</tr>
<tr>
<td class="org-right">8000.0</td>
<td class="org-right">400.0</td>
<td class="org-right">50000000.0</td>
<td class="org-right">-800000.0</td>
<td class="org-right">-300.0</td>
<td class="org-right">-40.0</td>
<td class="org-right">300.0</td>
<td class="org-right">100.0</td>
<td class="org-right">5000000.0</td>
<td class="org-right">40000.0</td>
</tr>
<tr>
<td class="org-right">-200.0</td>
<td class="org-right">30.0</td>
<td class="org-right">-800000.0</td>
<td class="org-right">20000.0</td>
<td class="org-right">5</td>
<td class="org-right">1</td>
<td class="org-right">-10.0</td>
<td class="org-right">-2</td>
<td class="org-right">-40000.0</td>
<td class="org-right">-300.0</td>
</tr>
<tr>
<td class="org-right">-30.0</td>
<td class="org-right">200.0</td>
<td class="org-right">-300.0</td>
<td class="org-right">5</td>
<td class="org-right">40000.0</td>
<td class="org-right">0.3</td>
<td class="org-right">-4</td>
<td class="org-right">-10.0</td>
<td class="org-right">40.0</td>
<td class="org-right">0.4</td>
</tr>
<tr>
<td class="org-right">-60000.0</td>
<td class="org-right">-1</td>
<td class="org-right">-40.0</td>
<td class="org-right">1</td>
<td class="org-right">0.3</td>
<td class="org-right">3000.0</td>
<td class="org-right">7000.0</td>
<td class="org-right">0.8</td>
<td class="org-right">-1</td>
<td class="org-right">0.0003</td>
</tr>
<tr>
<td class="org-right">20000000.0</td>
<td class="org-right">4000.0</td>
<td class="org-right">300.0</td>
<td class="org-right">-10.0</td>
<td class="org-right">-4</td>
<td class="org-right">7000.0</td>
<td class="org-right">300000000.0</td>
<td class="org-right">20000.0</td>
<td class="org-right">3000.0</td>
<td class="org-right">80.0</td>
</tr>
<tr>
<td class="org-right">-4000.0</td>
<td class="org-right">-8000000.0</td>
<td class="org-right">100.0</td>
<td class="org-right">-2</td>
<td class="org-right">-10.0</td>
<td class="org-right">0.8</td>
<td class="org-right">20000.0</td>
<td class="org-right">100000000.0</td>
<td class="org-right">-4000.0</td>
<td class="org-right">-100.0</td>
</tr>
<tr>
<td class="org-right">500.0</td>
<td class="org-right">800.0</td>
<td class="org-right">5000000.0</td>
<td class="org-right">-40000.0</td>
<td class="org-right">40.0</td>
<td class="org-right">-1</td>
<td class="org-right">3000.0</td>
<td class="org-right">-4000.0</td>
<td class="org-right">50000000.0</td>
<td class="org-right">800000.0</td>
</tr>
<tr>
<td class="org-right">8</td>
<td class="org-right">7</td>
<td class="org-right">40000.0</td>
<td class="org-right">-300.0</td>
<td class="org-right">0.4</td>
<td class="org-right">0.0003</td>
<td class="org-right">80.0</td>
<td class="org-right">-100.0</td>
<td class="org-right">800000.0</td>
<td class="org-right">20000.0</td>
</tr>
</tbody>
</table>
<table border="2" cellspacing="0" cellpadding="6" rules="groups" frame="hsides">
<caption class="t-above"><span class="table-number">Table 3:</span> First 10x10 elements of the Mass matrix</caption>
<colgroup>
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
<col class="org-right" />
</colgroup>
<tbody>
<tr>
<td class="org-right">0.03</td>
<td class="org-right">2e-06</td>
<td class="org-right">-2e-07</td>
<td class="org-right">1e-08</td>
<td class="org-right">2e-08</td>
<td class="org-right">0.0002</td>
<td class="org-right">-0.001</td>
<td class="org-right">2e-07</td>
<td class="org-right">-8e-08</td>
<td class="org-right">-9e-10</td>
</tr>
<tr>
<td class="org-right">2e-06</td>
<td class="org-right">0.02</td>
<td class="org-right">-5e-07</td>
<td class="org-right">7e-09</td>
<td class="org-right">3e-08</td>
<td class="org-right">2e-08</td>
<td class="org-right">-3e-07</td>
<td class="org-right">0.0003</td>
<td class="org-right">-1e-08</td>
<td class="org-right">1e-10</td>
</tr>
<tr>
<td class="org-right">-2e-07</td>
<td class="org-right">-5e-07</td>
<td class="org-right">0.02</td>
<td class="org-right">-9e-05</td>
<td class="org-right">4e-09</td>
<td class="org-right">-1e-08</td>
<td class="org-right">2e-07</td>
<td class="org-right">-2e-08</td>
<td class="org-right">-0.0006</td>
<td class="org-right">-5e-06</td>
</tr>
<tr>
<td class="org-right">1e-08</td>
<td class="org-right">7e-09</td>
<td class="org-right">-9e-05</td>
<td class="org-right">1e-06</td>
<td class="org-right">6e-11</td>
<td class="org-right">4e-10</td>
<td class="org-right">-1e-09</td>
<td class="org-right">3e-11</td>
<td class="org-right">5e-06</td>
<td class="org-right">3e-08</td>
</tr>
<tr>
<td class="org-right">2e-08</td>
<td class="org-right">3e-08</td>
<td class="org-right">4e-09</td>
<td class="org-right">6e-11</td>
<td class="org-right">1e-06</td>
<td class="org-right">2e-10</td>
<td class="org-right">-2e-09</td>
<td class="org-right">2e-10</td>
<td class="org-right">-7e-09</td>
<td class="org-right">-4e-11</td>
</tr>
<tr>
<td class="org-right">0.0002</td>
<td class="org-right">2e-08</td>
<td class="org-right">-1e-08</td>
<td class="org-right">4e-10</td>
<td class="org-right">2e-10</td>
<td class="org-right">2e-06</td>
<td class="org-right">-2e-06</td>
<td class="org-right">-1e-09</td>
<td class="org-right">-7e-10</td>
<td class="org-right">-9e-12</td>
</tr>
<tr>
<td class="org-right">-0.001</td>
<td class="org-right">-3e-07</td>
<td class="org-right">2e-07</td>
<td class="org-right">-1e-09</td>
<td class="org-right">-2e-09</td>
<td class="org-right">-2e-06</td>
<td class="org-right">0.03</td>
<td class="org-right">-2e-06</td>
<td class="org-right">-1e-07</td>
<td class="org-right">-5e-09</td>
</tr>
<tr>
<td class="org-right">2e-07</td>
<td class="org-right">0.0003</td>
<td class="org-right">-2e-08</td>
<td class="org-right">3e-11</td>
<td class="org-right">2e-10</td>
<td class="org-right">-1e-09</td>
<td class="org-right">-2e-06</td>
<td class="org-right">0.02</td>
<td class="org-right">-8e-07</td>
<td class="org-right">-1e-08</td>
</tr>
<tr>
<td class="org-right">-8e-08</td>
<td class="org-right">-1e-08</td>
<td class="org-right">-0.0006</td>
<td class="org-right">5e-06</td>
<td class="org-right">-7e-09</td>
<td class="org-right">-7e-10</td>
<td class="org-right">-1e-07</td>
<td class="org-right">-8e-07</td>
<td class="org-right">0.02</td>
<td class="org-right">9e-05</td>
</tr>
<tr>
<td class="org-right">-9e-10</td>
<td class="org-right">1e-10</td>
<td class="org-right">-5e-06</td>
<td class="org-right">3e-08</td>
<td class="org-right">-4e-11</td>
<td class="org-right">-9e-12</td>
<td class="org-right">-5e-09</td>
<td class="org-right">-1e-08</td>
<td class="org-right">9e-05</td>
<td class="org-right">1e-06</td>
</tr>
</tbody>
</table>
<p>
Using <code>K</code>, <code>M</code> and <code>int_xyz</code>, we can use the <code>Reduced Order Flexible Solid</code> simscape block.
</p>
</div>
</div>
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<div id="outline-container-org4f69d52" class="outline-3">
<h3 id="org4f69d52"><span class="section-number-3">1.2</span> Identification of the Dynamics</h3>
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<div class="outline-text-3" id="text-1-2">
<p>
The flexible element is imported using the <code>Reduced Order Flexible Solid</code> simscape block.
</p>
<p>
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To model the actuator, an <code>Internal Force</code> block is added between the nodes 3 and 12.
A <code>Relative Motion Sensor</code> block is added between the nodes 1 and 2 to measure the displacement and the amplified piezo.
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</p>
<p>
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One mass is fixed at one end of the piezo-electric stack actuator, the other end is fixed to the world frame.
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</p>
<p>
We first set the mass to be zero.
</p>
<div class="org-src-container">
<pre class="src src-matlab">m = 0;
</pre>
</div>
<p>
The dynamics is identified from the applied force to the measured relative displacement.
</p>
<div class="org-src-container">
<pre class="src src-matlab">%% Name of the Simulink File
mdl = 'piezo_amplified_3d';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/F'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/y'], 1, 'openoutput'); io_i = io_i + 1;
Gh = linearize(mdl, io);
</pre>
</div>
<p>
Then, we add 10Kg of mass:
</p>
<div class="org-src-container">
<pre class="src src-matlab">m = 10;
</pre>
</div>
<p>
And the dynamics is identified.
</p>
<p>
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The two identified dynamics are compared in Figure <a href="#orgfc13fe0">2</a>.
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</p>
<div class="org-src-container">
<pre class="src src-matlab">%% Name of the Simulink File
mdl = 'piezo_amplified_3d';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/F'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/y'], 1, 'openoutput'); io_i = io_i + 1;
Ghm = linearize(mdl, io);
</pre>
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<p><img src="figs/dynamics_act_disp_comp_mass.png" alt="dynamics_act_disp_comp_mass.png" />
</p>
<p><span class="figure-number">Figure 2: </span>Dynamics from \(F\) to \(d\) without a payload and with a 10kg payload</p>
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<h3 id="orga73b4fa"><span class="section-number-3">1.3</span> Comparison with Ansys</h3>
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<p>
Let&rsquo;s import the results from an Harmonic response analysis in Ansys.
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<div class="org-src-container">
<pre class="src src-matlab">Gresp0 = readtable('FEA_HarmResponse_00kg.txt');
Gresp10 = readtable('FEA_HarmResponse_10kg.txt');
</pre>
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<p>
The obtained dynamics from the Simscape model and from the Ansys analysis are compare in Figure <a href="#org587f215">3</a>.
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<p><img src="figs/dynamics_force_disp_comp_anasys.png" alt="dynamics_force_disp_comp_anasys.png" />
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<p><span class="figure-number">Figure 3: </span>Comparison of the obtained dynamics using Simscape with the harmonic response analysis using Ansys</p>
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<h3 id="org7e1d6fb"><span class="section-number-3">1.4</span> Force Sensor</h3>
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<p>
The dynamics is identified from internal forces applied between nodes 3 and 11 to the relative displacement of nodes 11 and 13.
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<p>
The obtained dynamics is shown in Figure <a href="#org2f215c1">4</a>.
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<div class="org-src-container">
<pre class="src src-matlab">m = 0;
</pre>
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<div class="org-src-container">
<pre class="src src-matlab">%% Name of the Simulink File
mdl = 'piezo_amplified_3d';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/Fa'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Fs'], 1, 'openoutput'); io_i = io_i + 1;
Gf = linearize(mdl, io);
</pre>
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<pre class="src src-matlab">m = 10;
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<div class="org-src-container">
<pre class="src src-matlab">%% Name of the Simulink File
mdl = 'piezo_amplified_3d';
%% Input/Output definition
clear io; io_i = 1;
io(io_i) = linio([mdl, '/Fa'], 1, 'openinput'); io_i = io_i + 1;
io(io_i) = linio([mdl, '/Fs'], 1, 'openoutput'); io_i = io_i + 1;
Gfm = linearize(mdl, io);
</pre>
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<p><img src="figs/dynamics_force_force_sensor_comp_mass.png" alt="dynamics_force_force_sensor_comp_mass.png" />
</p>
<p><span class="figure-number">Figure 4: </span>Dynamics from \(F\) to \(F_m\) for \(m=0\) and \(m = 10kg\)</p>
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<div id="postamble" class="status">
<p class="author">Author: Dehaeze Thomas</p>
Add legends to figures
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<p class="date">Created: 2020-06-14 dim. 12:31</p>
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