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<title>Centrifugal Forces</title>
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</div><div id="content">
<h1 class="title">Centrifugal Forces</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#org49834ed">1. Parameters</a></li>
<li><a href="#org4b7747e">2. Centrifugal forces for light and heavy sample</a></li>
<li><a href="#org92c9f54">3. Centrifugal forces as a function of the rotation speed</a></li>
<li><a href="#orgb7f1acf">4. Maximum rotation speed as a function of the mass</a></li>
<li><a href="#org5199302">1. Parameters</a></li>
<li><a href="#orga2ea10d">2. Centrifugal forces for light and heavy sample</a></li>
<li><a href="#orgf375b50">3. Centrifugal forces as a function of the rotation speed</a></li>
<li><a href="#orge7fb13d">4. Maximum rotation speed as a function of the mass</a></li>
</ul>
</div>
</div>
@@ -52,7 +56,7 @@ This is the case then the sample is moved by the micro-hexapod.
</p>
<p>
The centrifugal forces are defined as represented Figure <a href="#orgd84fe6e">1</a> where:
The centrifugal forces are defined as represented Figure <a href="#org91ed599">1</a> where:
</p>
<ul class="org-ul">
<li>\(M\) is the total mass of the rotating elements in \([kg]\)</li>
@@ -61,14 +65,14 @@ The centrifugal forces are defined as represented Figure <a href="#orgd84fe6e">1
</ul>
<div id="orgd84fe6e" class="figure">
<div id="org91ed599" class="figure">
<p><img src="./figs/centrifugal.png" alt="centrifugal.png" />
</p>
<p><span class="figure-number">Figure 1: </span>Centrifugal forces</p>
</div>
<div id="outline-container-org49834ed" class="outline-2">
<h2 id="org49834ed"><span class="section-number-2">1</span> Parameters</h2>
<div id="outline-container-org5199302" class="outline-2">
<h2 id="org5199302"><span class="section-number-2">1</span> Parameters</h2>
<div class="outline-text-2" id="text-1">
<p>
We define some parameters for the computation.
@@ -79,8 +83,8 @@ The mass of the sample can vary from \(1\,kg\) to \(50\,kg\) to which is added t
</p>
<div class="org-src-container">
<pre class="src src-matlab">M_light = 16; % mass of excentred parts mooving [kg]
M_heavy = 65; % [kg]
<pre class="src src-matlab"> M_light = 16; <span class="org-comment">% mass of excentred parts mooving [kg]</span>
M_heavy = 65; <span class="org-comment">% [kg]</span>
</pre>
</div>
@@ -88,8 +92,8 @@ M_heavy = 65; % [kg]
For the light mass, the rotation speed is 60rpm whereas for the heavy mass, it is equal to 1rpm.
</p>
<div class="org-src-container">
<pre class="src src-matlab">w_light = 2*pi; % rotational speed [rad/s]
w_heavy = 2*pi/60; % rotational speed [rad/s]
<pre class="src src-matlab"> w_light = 2<span class="org-type">*</span><span class="org-constant">pi</span>; <span class="org-comment">% rotational speed [rad/s]</span>
w_heavy = 2<span class="org-type">*</span><span class="org-constant">pi</span><span class="org-type">/</span>60; <span class="org-comment">% rotational speed [rad/s]</span>
</pre>
</div>
@@ -97,14 +101,14 @@ w_heavy = 2*pi/60; % rotational speed [rad/s]
Finally, we consider a mass eccentricity of \(10\,mm\).
</p>
<div class="org-src-container">
<pre class="src src-matlab">R = 0.01; % Excentricity [m]
<pre class="src src-matlab"> R = 0.01; <span class="org-comment">% Excentricity [m]</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org4b7747e" class="outline-2">
<h2 id="org4b7747e"><span class="section-number-2">2</span> Centrifugal forces for light and heavy sample</h2>
<div id="outline-container-orga2ea10d" class="outline-2">
<h2 id="orga2ea10d"><span class="section-number-2">2</span> Centrifugal forces for light and heavy sample</h2>
<div class="outline-text-2" id="text-2">
<p>
From the formula \(F_c = m \omega^2 r\), we obtain the values shown below.
@@ -139,15 +143,15 @@ From the formula \(F_c = m \omega^2 r\), we obtain the values shown below.
</div>
</div>
<div id="outline-container-org92c9f54" class="outline-2">
<h2 id="org92c9f54"><span class="section-number-2">3</span> Centrifugal forces as a function of the rotation speed</h2>
<div id="outline-container-orgf375b50" class="outline-2">
<h2 id="orgf375b50"><span class="section-number-2">3</span> Centrifugal forces as a function of the rotation speed</h2>
<div class="outline-text-2" id="text-3">
<p>
The centrifugal forces as a function of the rotation speed for light and heavy sample is shown on Figure <a href="#orgfaf795f">2</a>.
The centrifugal forces as a function of the rotation speed for light and heavy sample is shown on Figure <a href="#org87b7644">2</a>.
</p>
<div id="orgfaf795f" class="figure">
<div id="org87b7644" class="figure">
<p><img src="figs/centrifugal_forces_rpm.png" alt="centrifugal_forces_rpm.png" />
</p>
<p><span class="figure-number">Figure 2: </span>Centrifugal forces function of the rotation speed</p>
@@ -155,29 +159,29 @@ The centrifugal forces as a function of the rotation speed for light and heavy s
</div>
</div>
<div id="outline-container-orgb7f1acf" class="outline-2">
<h2 id="orgb7f1acf"><span class="section-number-2">4</span> Maximum rotation speed as a function of the mass</h2>
<div id="outline-container-orge7fb13d" class="outline-2">
<h2 id="orge7fb13d"><span class="section-number-2">4</span> Maximum rotation speed as a function of the mass</h2>
<div class="outline-text-2" id="text-4">
<p>
We plot the maximum rotation speed as a function of the mass for different maximum force that we can use to counteract the centrifugal forces (Figure <a href="#org6ee8f38">3</a>).
We plot the maximum rotation speed as a function of the mass for different maximum force that we can use to counteract the centrifugal forces (Figure <a href="#org8fe6a07">3</a>).
</p>
<p>
From a specified maximum allowed centrifugal force (here set to \(10\,[N]\)), the maximum rotation speed as a function of the sample&rsquo;s mass is shown in Figure <a href="#org6ee8f38">3</a>.
From a specified maximum allowed centrifugal force (here set to \(10\,[N]\)), the maximum rotation speed as a function of the sample&rsquo;s mass is shown in Figure <a href="#org8fe6a07">3</a>.
</p>
<div class="org-src-container">
<pre class="src src-matlab">F_max = 10; % Maximum accepted centrifugal forces [N]
<pre class="src src-matlab"> F_max = 10; <span class="org-comment">% Maximum accepted centrifugal forces [N]</span>
R = 0.01;
R = 0.01;
M_sample = 0:1:100;
M_reflector = 15;
M_sample = 0<span class="org-type">:</span>1<span class="org-type">:</span>100;
M_reflector = 15;
</pre>
</div>
<div id="org6ee8f38" class="figure">
<div id="org8fe6a07" class="figure">
<p><img src="figs/max_force_rpm.png" alt="max_force_rpm.png" />
</p>
<p><span class="figure-number">Figure 3: </span>Maximum rotation speed as a function of the sample mass for an allowed centrifugal force of \(100\,[N]\)</p>
@@ -187,7 +191,7 @@ M_reflector = 15;
</div>
<div id="postamble" class="status">
<p class="author">Author: Dehaeze Thomas</p>
<p class="date">Created: 2020-05-07 jeu. 14:05</p>
<p class="date">Created: 2021-02-20 sam. 23:09</p>
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