475 lines
		
	
	
		
			37 KiB
		
	
	
	
		
			HTML
		
	
	
	
	
	
			
		
		
	
	
			475 lines
		
	
	
		
			37 KiB
		
	
	
	
		
			HTML
		
	
	
	
	
	
<?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">
 | 
						|
<head>
 | 
						|
<!-- 2019-08-26 lun. 11:55 -->
 | 
						|
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
 | 
						|
<meta name="viewport" content="width=device-width, initial-scale=1" />
 | 
						|
<title>Kinematic Study of the Stewart Platform</title>
 | 
						|
<meta name="generator" content="Org mode" />
 | 
						|
<meta name="author" content="Thomas Dehaeze" />
 | 
						|
<style type="text/css">
 | 
						|
 <!--/*--><![CDATA[/*><!--*/
 | 
						|
  .title  { text-align: center;
 | 
						|
             margin-bottom: .2em; }
 | 
						|
  .subtitle { text-align: center;
 | 
						|
              font-size: medium;
 | 
						|
              font-weight: bold;
 | 
						|
              margin-top:0; }
 | 
						|
  .todo   { font-family: monospace; color: red; }
 | 
						|
  .done   { font-family: monospace; color: green; }
 | 
						|
  .priority { font-family: monospace; color: orange; }
 | 
						|
  .tag    { background-color: #eee; font-family: monospace;
 | 
						|
            padding: 2px; font-size: 80%; font-weight: normal; }
 | 
						|
  .timestamp { color: #bebebe; }
 | 
						|
  .timestamp-kwd { color: #5f9ea0; }
 | 
						|
  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
 | 
						|
  .org-left   { margin-left: 0px;  margin-right: auto; text-align: left; }
 | 
						|
  .org-center { margin-left: auto; margin-right: auto; text-align: center; }
 | 
						|
  .underline { text-decoration: underline; }
 | 
						|
  #postamble p, #preamble p { font-size: 90%; margin: .2em; }
 | 
						|
  p.verse { margin-left: 3%; }
 | 
						|
  pre {
 | 
						|
    border: 1px solid #ccc;
 | 
						|
    box-shadow: 3px 3px 3px #eee;
 | 
						|
    padding: 8pt;
 | 
						|
    font-family: monospace;
 | 
						|
    overflow: auto;
 | 
						|
    margin: 1.2em;
 | 
						|
  }
 | 
						|
  pre.src {
 | 
						|
    position: relative;
 | 
						|
    overflow: visible;
 | 
						|
    padding-top: 1.2em;
 | 
						|
  }
 | 
						|
  pre.src:before {
 | 
						|
    display: none;
 | 
						|
    position: absolute;
 | 
						|
    background-color: white;
 | 
						|
    top: -10px;
 | 
						|
    right: 10px;
 | 
						|
    padding: 3px;
 | 
						|
    border: 1px solid black;
 | 
						|
  }
 | 
						|
  pre.src:hover:before { display: inline;}
 | 
						|
  /* Languages per Org manual */
 | 
						|
  pre.src-asymptote:before { content: 'Asymptote'; }
 | 
						|
  pre.src-awk:before { content: 'Awk'; }
 | 
						|
  pre.src-C:before { content: 'C'; }
 | 
						|
  /* pre.src-C++ doesn't work in CSS */
 | 
						|
  pre.src-clojure:before { content: 'Clojure'; }
 | 
						|
  pre.src-css:before { content: 'CSS'; }
 | 
						|
  pre.src-D:before { content: 'D'; }
 | 
						|
  pre.src-ditaa:before { content: 'ditaa'; }
 | 
						|
  pre.src-dot:before { content: 'Graphviz'; }
 | 
						|
  pre.src-calc:before { content: 'Emacs Calc'; }
 | 
						|
  pre.src-emacs-lisp:before { content: 'Emacs Lisp'; }
 | 
						|
  pre.src-fortran:before { content: 'Fortran'; }
 | 
						|
  pre.src-gnuplot:before { content: 'gnuplot'; }
 | 
						|
  pre.src-haskell:before { content: 'Haskell'; }
 | 
						|
  pre.src-hledger:before { content: 'hledger'; }
 | 
						|
  pre.src-java:before { content: 'Java'; }
 | 
						|
  pre.src-js:before { content: 'Javascript'; }
 | 
						|
  pre.src-latex:before { content: 'LaTeX'; }
 | 
						|
  pre.src-ledger:before { content: 'Ledger'; }
 | 
						|
  pre.src-lisp:before { content: 'Lisp'; }
 | 
						|
  pre.src-lilypond:before { content: 'Lilypond'; }
 | 
						|
  pre.src-lua:before { content: 'Lua'; }
 | 
						|
  pre.src-matlab:before { content: 'MATLAB'; }
 | 
						|
  pre.src-mscgen:before { content: 'Mscgen'; }
 | 
						|
  pre.src-ocaml:before { content: 'Objective Caml'; }
 | 
						|
  pre.src-octave:before { content: 'Octave'; }
 | 
						|
  pre.src-org:before { content: 'Org mode'; }
 | 
						|
  pre.src-oz:before { content: 'OZ'; }
 | 
						|
  pre.src-plantuml:before { content: 'Plantuml'; }
 | 
						|
  pre.src-processing:before { content: 'Processing.js'; }
 | 
						|
  pre.src-python:before { content: 'Python'; }
 | 
						|
  pre.src-R:before { content: 'R'; }
 | 
						|
  pre.src-ruby:before { content: 'Ruby'; }
 | 
						|
  pre.src-sass:before { content: 'Sass'; }
 | 
						|
  pre.src-scheme:before { content: 'Scheme'; }
 | 
						|
  pre.src-screen:before { content: 'Gnu Screen'; }
 | 
						|
  pre.src-sed:before { content: 'Sed'; }
 | 
						|
  pre.src-sh:before { content: 'shell'; }
 | 
						|
  pre.src-sql:before { content: 'SQL'; }
 | 
						|
  pre.src-sqlite:before { content: 'SQLite'; }
 | 
						|
  /* additional languages in org.el's org-babel-load-languages alist */
 | 
						|
  pre.src-forth:before { content: 'Forth'; }
 | 
						|
  pre.src-io:before { content: 'IO'; }
 | 
						|
  pre.src-J:before { content: 'J'; }
 | 
						|
  pre.src-makefile:before { content: 'Makefile'; }
 | 
						|
  pre.src-maxima:before { content: 'Maxima'; }
 | 
						|
  pre.src-perl:before { content: 'Perl'; }
 | 
						|
  pre.src-picolisp:before { content: 'Pico Lisp'; }
 | 
						|
  pre.src-scala:before { content: 'Scala'; }
 | 
						|
  pre.src-shell:before { content: 'Shell Script'; }
 | 
						|
  pre.src-ebnf2ps:before { content: 'ebfn2ps'; }
 | 
						|
  /* additional language identifiers per "defun org-babel-execute"
 | 
						|
       in ob-*.el */
 | 
						|
  pre.src-cpp:before  { content: 'C++'; }
 | 
						|
  pre.src-abc:before  { content: 'ABC'; }
 | 
						|
  pre.src-coq:before  { content: 'Coq'; }
 | 
						|
  pre.src-groovy:before  { content: 'Groovy'; }
 | 
						|
  /* additional language identifiers from org-babel-shell-names in
 | 
						|
     ob-shell.el: ob-shell is the only babel language using a lambda to put
 | 
						|
     the execution function name together. */
 | 
						|
  pre.src-bash:before  { content: 'bash'; }
 | 
						|
  pre.src-csh:before  { content: 'csh'; }
 | 
						|
  pre.src-ash:before  { content: 'ash'; }
 | 
						|
  pre.src-dash:before  { content: 'dash'; }
 | 
						|
  pre.src-ksh:before  { content: 'ksh'; }
 | 
						|
  pre.src-mksh:before  { content: 'mksh'; }
 | 
						|
  pre.src-posh:before  { content: 'posh'; }
 | 
						|
  /* Additional Emacs modes also supported by the LaTeX listings package */
 | 
						|
  pre.src-ada:before { content: 'Ada'; }
 | 
						|
  pre.src-asm:before { content: 'Assembler'; }
 | 
						|
  pre.src-caml:before { content: 'Caml'; }
 | 
						|
  pre.src-delphi:before { content: 'Delphi'; }
 | 
						|
  pre.src-html:before { content: 'HTML'; }
 | 
						|
  pre.src-idl:before { content: 'IDL'; }
 | 
						|
  pre.src-mercury:before { content: 'Mercury'; }
 | 
						|
  pre.src-metapost:before { content: 'MetaPost'; }
 | 
						|
  pre.src-modula-2:before { content: 'Modula-2'; }
 | 
						|
  pre.src-pascal:before { content: 'Pascal'; }
 | 
						|
  pre.src-ps:before { content: 'PostScript'; }
 | 
						|
  pre.src-prolog:before { content: 'Prolog'; }
 | 
						|
  pre.src-simula:before { content: 'Simula'; }
 | 
						|
  pre.src-tcl:before { content: 'tcl'; }
 | 
						|
  pre.src-tex:before { content: 'TeX'; }
 | 
						|
  pre.src-plain-tex:before { content: 'Plain TeX'; }
 | 
						|
  pre.src-verilog:before { content: 'Verilog'; }
 | 
						|
  pre.src-vhdl:before { content: 'VHDL'; }
 | 
						|
  pre.src-xml:before { content: 'XML'; }
 | 
						|
  pre.src-nxml:before { content: 'XML'; }
 | 
						|
  /* add a generic configuration mode; LaTeX export needs an additional
 | 
						|
     (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
 | 
						|
  pre.src-conf:before { content: 'Configuration File'; }
 | 
						|
 | 
						|
  table { border-collapse:collapse; }
 | 
						|
  caption.t-above { caption-side: top; }
 | 
						|
  caption.t-bottom { caption-side: bottom; }
 | 
						|
  td, th { vertical-align:top;  }
 | 
						|
  th.org-right  { text-align: center;  }
 | 
						|
  th.org-left   { text-align: center;   }
 | 
						|
  th.org-center { text-align: center; }
 | 
						|
  td.org-right  { text-align: right;  }
 | 
						|
  td.org-left   { text-align: left;   }
 | 
						|
  td.org-center { text-align: center; }
 | 
						|
  dt { font-weight: bold; }
 | 
						|
  .footpara { display: inline; }
 | 
						|
  .footdef  { margin-bottom: 1em; }
 | 
						|
  .figure { padding: 1em; }
 | 
						|
  .figure p { text-align: center; }
 | 
						|
  .equation-container {
 | 
						|
    display: table;
 | 
						|
    text-align: center;
 | 
						|
    width: 100%;
 | 
						|
  }
 | 
						|
  .equation {
 | 
						|
    vertical-align: middle;
 | 
						|
  }
 | 
						|
  .equation-label {
 | 
						|
    display: table-cell;
 | 
						|
    text-align: right;
 | 
						|
    vertical-align: middle;
 | 
						|
  }
 | 
						|
  .inlinetask {
 | 
						|
    padding: 10px;
 | 
						|
    border: 2px solid gray;
 | 
						|
    margin: 10px;
 | 
						|
    background: #ffffcc;
 | 
						|
  }
 | 
						|
  #org-div-home-and-up
 | 
						|
   { text-align: right; font-size: 70%; white-space: nowrap; }
 | 
						|
  textarea { overflow-x: auto; }
 | 
						|
  .linenr { font-size: smaller }
 | 
						|
  .code-highlighted { background-color: #ffff00; }
 | 
						|
  .org-info-js_info-navigation { border-style: none; }
 | 
						|
  #org-info-js_console-label
 | 
						|
    { font-size: 10px; font-weight: bold; white-space: nowrap; }
 | 
						|
  .org-info-js_search-highlight
 | 
						|
    { background-color: #ffff00; color: #000000; font-weight: bold; }
 | 
						|
  .org-svg { width: 90%; }
 | 
						|
  /*]]>*/-->
 | 
						|
</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>
 | 
						|
<script src="./js/bootstrap.min.js"></script>
 | 
						|
<script src="./js/jquery.stickytableheaders.min.js"></script>
 | 
						|
<script src="./js/readtheorg.js"></script>
 | 
						|
<script type="text/javascript">
 | 
						|
/*
 | 
						|
@licstart  The following is the entire license notice for the
 | 
						|
JavaScript code in this tag.
 | 
						|
 | 
						|
Copyright (C) 2012-2019 Free Software Foundation, Inc.
 | 
						|
 | 
						|
The JavaScript code in this tag is free software: you can
 | 
						|
redistribute it and/or modify it under the terms of the GNU
 | 
						|
General Public License (GNU GPL) as published by the Free Software
 | 
						|
Foundation, either version 3 of the License, or (at your option)
 | 
						|
any later version.  The code is distributed WITHOUT ANY WARRANTY;
 | 
						|
without even the implied warranty of MERCHANTABILITY or FITNESS
 | 
						|
FOR A PARTICULAR PURPOSE.  See the GNU GPL for more details.
 | 
						|
 | 
						|
As additional permission under GNU GPL version 3 section 7, you
 | 
						|
may distribute non-source (e.g., minimized or compacted) forms of
 | 
						|
that code without the copy of the GNU GPL normally required by
 | 
						|
section 4, provided you include this license notice and a URL
 | 
						|
through which recipients can access the Corresponding Source.
 | 
						|
 | 
						|
 | 
						|
@licend  The above is the entire license notice
 | 
						|
for the JavaScript code in this tag.
 | 
						|
*/
 | 
						|
<!--/*--><![CDATA[/*><!--*/
 | 
						|
 function CodeHighlightOn(elem, id)
 | 
						|
 {
 | 
						|
   var target = document.getElementById(id);
 | 
						|
   if(null != target) {
 | 
						|
     elem.cacheClassElem = elem.className;
 | 
						|
     elem.cacheClassTarget = target.className;
 | 
						|
     target.className = "code-highlighted";
 | 
						|
     elem.className   = "code-highlighted";
 | 
						|
   }
 | 
						|
 }
 | 
						|
 function CodeHighlightOff(elem, id)
 | 
						|
 {
 | 
						|
   var target = document.getElementById(id);
 | 
						|
   if(elem.cacheClassElem)
 | 
						|
     elem.className = elem.cacheClassElem;
 | 
						|
   if(elem.cacheClassTarget)
 | 
						|
     target.className = elem.cacheClassTarget;
 | 
						|
 }
 | 
						|
/*]]>*///-->
 | 
						|
</script>
 | 
						|
</head>
 | 
						|
<body>
 | 
						|
<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">Kinematic Study of the Stewart Platform</h1>
 | 
						|
<div id="table-of-contents">
 | 
						|
<h2>Table of Contents</h2>
 | 
						|
<div id="text-table-of-contents">
 | 
						|
<ul>
 | 
						|
<li><a href="#org4a99119">1. Needed Actuator Stroke</a>
 | 
						|
<ul>
 | 
						|
<li><a href="#org119868f">1.1. Stewart architecture definition</a></li>
 | 
						|
<li><a href="#org8ece9f1">1.2. Wanted translations and rotations</a></li>
 | 
						|
<li><a href="#org8cd9dfc">1.3. Needed stroke for "pure" rotations or translations</a></li>
 | 
						|
<li><a href="#org9acbff2">1.4. Needed stroke for combined translations and rotations</a></li>
 | 
						|
</ul>
 | 
						|
</li>
 | 
						|
<li><a href="#org0aef174">2. Maximum Stroke</a></li>
 | 
						|
<li><a href="#orgff4f3e2">3. Functions</a>
 | 
						|
<ul>
 | 
						|
<li><a href="#orgca8f528">3.1. getMaxPositions</a></li>
 | 
						|
<li><a href="#org0ac04ca">3.2. getMaxPureDisplacement</a></li>
 | 
						|
</ul>
 | 
						|
</li>
 | 
						|
</ul>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org4a99119" class="outline-2">
 | 
						|
<h2 id="org4a99119"><span class="section-number-2">1</span> Needed Actuator Stroke</h2>
 | 
						|
<div class="outline-text-2" id="text-1">
 | 
						|
<p>
 | 
						|
The goal is to determine the needed stroke of the actuators to obtain wanted translations and rotations.
 | 
						|
</p>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org119868f" class="outline-3">
 | 
						|
<h3 id="org119868f"><span class="section-number-3">1.1</span> Stewart architecture definition</h3>
 | 
						|
<div class="outline-text-3" id="text-1-1">
 | 
						|
<p>
 | 
						|
We use a cubic architecture.
 | 
						|
</p>
 | 
						|
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab">opts = struct<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-underline">...</span>
 | 
						|
    <span class="org-string">'H_tot'</span>, <span class="org-highlight-numbers-number">90</span>, <span class="org-underline">...</span> <span class="org-comment">% Total height of the Hexapod [mm]</span>
 | 
						|
    <span class="org-string">'L'</span>,     <span class="org-highlight-numbers-number">200</span><span class="org-type">/</span>sqrt<span class="org-rainbow-delimiters-depth-2">(</span><span class="org-highlight-numbers-number">3</span><span class="org-rainbow-delimiters-depth-2">)</span>, <span class="org-underline">...</span> <span class="org-comment">% Size of the Cube [mm]</span>
 | 
						|
    <span class="org-string">'H'</span>,     <span class="org-highlight-numbers-number">60</span>, <span class="org-underline">...</span> <span class="org-comment">% Height between base joints and platform joints [mm]</span>
 | 
						|
    <span class="org-string">'H0'</span>,    <span class="org-highlight-numbers-number">200</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">60</span><span class="org-type">/</span><span class="org-highlight-numbers-number">2</span> <span class="org-underline">...</span> <span class="org-comment">% Height between the corner of the cube and the plane containing the base joints [mm]</span>
 | 
						|
    <span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
stewart = initializeCubicConfiguration<span class="org-rainbow-delimiters-depth-1">(</span>opts<span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
opts = struct<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-underline">...</span>
 | 
						|
    <span class="org-string">'Jd_pos'</span>, <span class="org-rainbow-delimiters-depth-2">[</span><span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">100</span><span class="org-rainbow-delimiters-depth-2">]</span>, <span class="org-underline">...</span> <span class="org-comment">% Position of the Jacobian for displacement estimation from the top of the mobile platform [mm]</span>
 | 
						|
    <span class="org-string">'Jf_pos'</span>, <span class="org-rainbow-delimiters-depth-2">[</span><span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">0</span>, <span class="org-type">-</span><span class="org-highlight-numbers-number">50</span><span class="org-rainbow-delimiters-depth-2">]</span>  <span class="org-underline">...</span> <span class="org-comment">% Position of the Jacobian for force location from the top of the mobile platform [mm]</span>
 | 
						|
    <span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
stewart = computeGeometricalProperties<span class="org-rainbow-delimiters-depth-1">(</span>stewart, opts<span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
opts = struct<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-underline">...</span>
 | 
						|
    <span class="org-string">'stroke'</span>, <span class="org-highlight-numbers-number">50e</span><span class="org-type">-</span><span class="org-highlight-numbers-number">6</span> <span class="org-underline">...</span> <span class="org-comment">% Maximum stroke of each actuator [m]</span>
 | 
						|
    <span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
stewart = initializeMechanicalElements<span class="org-rainbow-delimiters-depth-1">(</span>stewart, opts<span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
 | 
						|
save<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-string">'./mat/stewart.mat', 'stewart'</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org8ece9f1" class="outline-3">
 | 
						|
<h3 id="org8ece9f1"><span class="section-number-3">1.2</span> Wanted translations and rotations</h3>
 | 
						|
<div class="outline-text-3" id="text-1-2">
 | 
						|
<p>
 | 
						|
We define wanted translations and rotations
 | 
						|
</p>
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab">Tx_max = <span class="org-highlight-numbers-number">15e</span><span class="org-type">-</span><span class="org-highlight-numbers-number">6</span>; <span class="org-comment">% Translation [m]</span>
 | 
						|
Ty_max = <span class="org-highlight-numbers-number">15e</span><span class="org-type">-</span><span class="org-highlight-numbers-number">6</span>; <span class="org-comment">% Translation [m]</span>
 | 
						|
Tz_max = <span class="org-highlight-numbers-number">15e</span><span class="org-type">-</span><span class="org-highlight-numbers-number">6</span>; <span class="org-comment">% Translation [m]</span>
 | 
						|
Rx_max = <span class="org-highlight-numbers-number">30e</span><span class="org-type">-</span><span class="org-highlight-numbers-number">6</span>; <span class="org-comment">% Rotation [rad]</span>
 | 
						|
Ry_max = <span class="org-highlight-numbers-number">30e</span><span class="org-type">-</span><span class="org-highlight-numbers-number">6</span>; <span class="org-comment">% Rotation [rad]</span>
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org8cd9dfc" class="outline-3">
 | 
						|
<h3 id="org8cd9dfc"><span class="section-number-3">1.3</span> Needed stroke for "pure" rotations or translations</h3>
 | 
						|
<div class="outline-text-3" id="text-1-3">
 | 
						|
<p>
 | 
						|
First, we estimate the needed actuator stroke for "pure" rotations and translation.
 | 
						|
</p>
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab">LTx = stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">[</span>Tx_max <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>';
 | 
						|
LTy = stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">[</span><span class="org-highlight-numbers-number">0</span> Ty_max <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>';
 | 
						|
LTz = stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> Tz_max <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>';
 | 
						|
LRx = stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> Rx_max <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>';
 | 
						|
LRy = stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> Ry_max <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>';
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
 | 
						|
<pre class="example">
 | 
						|
From -1.2e-05[m] to 1.1e-05[m]: Total stroke = 22.9[um]
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org9acbff2" class="outline-3">
 | 
						|
<h3 id="org9acbff2"><span class="section-number-3">1.4</span> Needed stroke for combined translations and rotations</h3>
 | 
						|
<div class="outline-text-3" id="text-1-4">
 | 
						|
<p>
 | 
						|
Now, we combine translations and rotations, and we try to find the worst case (that we suppose to happen at the border).
 | 
						|
</p>
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab">Lmax = <span class="org-highlight-numbers-number">0</span>;
 | 
						|
Lmin = <span class="org-highlight-numbers-number">0</span>;
 | 
						|
pos = <span class="org-rainbow-delimiters-depth-1">[</span><span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>;
 | 
						|
<span class="org-keyword">for</span> <span class="org-variable-name">Tx</span> = <span class="org-constant"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-constant">-Tx_max</span>,Tx_max<span class="org-rainbow-delimiters-depth-1">]</span>
 | 
						|
<span class="org-keyword">for</span> <span class="org-variable-name">Ty</span> = <span class="org-constant"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-constant">-Ty_max</span>,Ty_max<span class="org-rainbow-delimiters-depth-1">]</span>
 | 
						|
<span class="org-keyword">for</span> <span class="org-variable-name">Tz</span> = <span class="org-constant"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-constant">-Tz_max</span>,Tz_max<span class="org-rainbow-delimiters-depth-1">]</span>
 | 
						|
<span class="org-keyword">for</span> <span class="org-variable-name">Rx</span> = <span class="org-constant"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-constant">-Rx_max</span>,Rx_max<span class="org-rainbow-delimiters-depth-1">]</span>
 | 
						|
<span class="org-keyword">for</span> <span class="org-variable-name">Ry</span> = <span class="org-constant"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-constant">-Ry_max</span>,Ry_max<span class="org-rainbow-delimiters-depth-1">]</span>
 | 
						|
    lmax = max<span class="org-rainbow-delimiters-depth-1">(</span>stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-2">[</span>Tx Ty Tz Rx Ry <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-2">]</span>'<span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    lmin = min<span class="org-rainbow-delimiters-depth-1">(</span>stewart.Jd<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-2">[</span>Tx Ty Tz Rx Ry <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-2">]</span>'<span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    <span class="org-keyword">if</span> lmax <span class="org-type">></span> Lmax
 | 
						|
        Lmax = lmax;
 | 
						|
        pos = <span class="org-rainbow-delimiters-depth-1">[</span>Tx Ty Tz Rx Ry<span class="org-rainbow-delimiters-depth-1">]</span>;
 | 
						|
    <span class="org-keyword">end</span>
 | 
						|
    <span class="org-keyword">if</span> lmin <span class="org-type"><</span> Lmin
 | 
						|
        Lmin = lmin;
 | 
						|
    <span class="org-keyword">end</span>
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
 | 
						|
<p>
 | 
						|
We obtain a needed stroke shown below (almost two times the needed stroke for "pure" rotations and translations).
 | 
						|
</p>
 | 
						|
<pre class="example">
 | 
						|
From -3.1e-05[m] to 3.1e-05[m]: Total stroke = 61.5[um]
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org0aef174" class="outline-2">
 | 
						|
<h2 id="org0aef174"><span class="section-number-2">2</span> Maximum Stroke</h2>
 | 
						|
<div class="outline-text-2" id="text-2">
 | 
						|
<p>
 | 
						|
From a specified actuator stroke, we try to estimate the available maneuverability of the Stewart platform.
 | 
						|
</p>
 | 
						|
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab"><span class="org-rainbow-delimiters-depth-1">[</span>X, Y, Z<span class="org-rainbow-delimiters-depth-1">]</span> = getMaxPositions<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-variable-name">stewart</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab"><span class="org-type">figure</span>;
 | 
						|
plot3<span class="org-rainbow-delimiters-depth-1">(</span>X, Y, Z, <span class="org-string">'k-'</span><span class="org-rainbow-delimiters-depth-1">)</span>
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-orgff4f3e2" class="outline-2">
 | 
						|
<h2 id="orgff4f3e2"><span class="section-number-2">3</span> Functions</h2>
 | 
						|
<div class="outline-text-2" id="text-3">
 | 
						|
</div>
 | 
						|
<div id="outline-container-orgca8f528" class="outline-3">
 | 
						|
<h3 id="orgca8f528"><span class="section-number-3">3.1</span> getMaxPositions</h3>
 | 
						|
<div class="outline-text-3" id="text-3-1">
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab"><span class="org-keyword">function</span> <span class="org-variable-name"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-variable-name">X, Y, Z</span><span class="org-variable-name"><span class="org-rainbow-delimiters-depth-1">]</span></span> = <span class="org-function-name">getMaxPositions</span><span class="org-rainbow-delimiters-depth-1">(</span><span class="org-variable-name">stewart</span><span class="org-rainbow-delimiters-depth-1">)</span>
 | 
						|
    Leg = stewart.Leg;
 | 
						|
    J = stewart.Jd;
 | 
						|
    theta = linspace<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">0</span>, <span class="org-highlight-numbers-number">2</span><span class="org-type">*</span><span class="org-constant">pi</span>, <span class="org-highlight-numbers-number">100</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    phi = linspace<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-type">-</span><span class="org-constant">pi</span><span class="org-type">/</span><span class="org-highlight-numbers-number">2</span> , <span class="org-constant">pi</span><span class="org-type">/</span><span class="org-highlight-numbers-number">2</span>, <span class="org-highlight-numbers-number">100</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    dmax = zeros<span class="org-rainbow-delimiters-depth-1">(</span>length<span class="org-rainbow-delimiters-depth-2">(</span>theta<span class="org-rainbow-delimiters-depth-2">)</span>, length<span class="org-rainbow-delimiters-depth-2">(</span>phi<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
 | 
						|
    <span class="org-keyword">for</span> <span class="org-variable-name">i</span> = <span class="org-constant"><span class="org-highlight-numbers-number">1</span></span><span class="org-constant">:length</span><span class="org-constant"><span class="org-rainbow-delimiters-depth-1">(</span></span><span class="org-constant">theta</span><span class="org-constant"><span class="org-rainbow-delimiters-depth-1">)</span></span>
 | 
						|
        <span class="org-keyword">for</span> <span class="org-variable-name">j</span> = <span class="org-constant"><span class="org-highlight-numbers-number">1</span></span><span class="org-constant">:length</span><span class="org-constant"><span class="org-rainbow-delimiters-depth-1">(</span></span><span class="org-constant">phi</span><span class="org-constant"><span class="org-rainbow-delimiters-depth-1">)</span></span>
 | 
						|
            L = J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-1">[</span>cos<span class="org-rainbow-delimiters-depth-2">(</span>phi<span class="org-rainbow-delimiters-depth-3">(</span><span class="org-constant">j</span><span class="org-rainbow-delimiters-depth-3">)</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-type">*</span>cos<span class="org-rainbow-delimiters-depth-2">(</span>theta<span class="org-rainbow-delimiters-depth-3">(</span><span class="org-constant">i</span><span class="org-rainbow-delimiters-depth-3">)</span><span class="org-rainbow-delimiters-depth-2">)</span> cos<span class="org-rainbow-delimiters-depth-2">(</span>phi<span class="org-rainbow-delimiters-depth-3">(</span><span class="org-constant">j</span><span class="org-rainbow-delimiters-depth-3">)</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-type">*</span>sin<span class="org-rainbow-delimiters-depth-2">(</span>theta<span class="org-rainbow-delimiters-depth-3">(</span><span class="org-constant">i</span><span class="org-rainbow-delimiters-depth-3">)</span><span class="org-rainbow-delimiters-depth-2">)</span> sin<span class="org-rainbow-delimiters-depth-2">(</span>phi<span class="org-rainbow-delimiters-depth-3">(</span><span class="org-constant">j</span><span class="org-rainbow-delimiters-depth-3">)</span><span class="org-rainbow-delimiters-depth-2">)</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-1">]</span>';
 | 
						|
            dmax<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-constant">i</span>, <span class="org-constant">j</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>L<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
        <span class="org-keyword">end</span>
 | 
						|
    <span class="org-keyword">end</span>
 | 
						|
 | 
						|
    X = dmax<span class="org-type">.*</span>cos<span class="org-rainbow-delimiters-depth-1">(</span>repmat<span class="org-rainbow-delimiters-depth-2">(</span>phi,length<span class="org-rainbow-delimiters-depth-3">(</span>theta<span class="org-rainbow-delimiters-depth-3">)</span>,<span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span><span class="org-type">.*</span>cos<span class="org-rainbow-delimiters-depth-1">(</span>repmat<span class="org-rainbow-delimiters-depth-2">(</span>theta,length<span class="org-rainbow-delimiters-depth-3">(</span>phi<span class="org-rainbow-delimiters-depth-3">)</span>,<span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>';
 | 
						|
    Y = dmax<span class="org-type">.*</span>cos<span class="org-rainbow-delimiters-depth-1">(</span>repmat<span class="org-rainbow-delimiters-depth-2">(</span>phi,length<span class="org-rainbow-delimiters-depth-3">(</span>theta<span class="org-rainbow-delimiters-depth-3">)</span>,<span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span><span class="org-type">.*</span>sin<span class="org-rainbow-delimiters-depth-1">(</span>repmat<span class="org-rainbow-delimiters-depth-2">(</span>theta,length<span class="org-rainbow-delimiters-depth-3">(</span>phi<span class="org-rainbow-delimiters-depth-3">)</span>,<span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>';
 | 
						|
    Z = dmax<span class="org-type">.*</span>sin<span class="org-rainbow-delimiters-depth-1">(</span>repmat<span class="org-rainbow-delimiters-depth-2">(</span>phi,length<span class="org-rainbow-delimiters-depth-3">(</span>theta<span class="org-rainbow-delimiters-depth-3">)</span>,<span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
 | 
						|
<div id="outline-container-org0ac04ca" class="outline-3">
 | 
						|
<h3 id="org0ac04ca"><span class="section-number-3">3.2</span> getMaxPureDisplacement</h3>
 | 
						|
<div class="outline-text-3" id="text-3-2">
 | 
						|
<div class="org-src-container">
 | 
						|
<pre class="src src-matlab"><span class="org-keyword">function</span> <span class="org-variable-name"><span class="org-rainbow-delimiters-depth-1">[</span></span><span class="org-variable-name">max_disp</span><span class="org-variable-name"><span class="org-rainbow-delimiters-depth-1">]</span></span> = <span class="org-function-name">getMaxPureDisplacement</span><span class="org-rainbow-delimiters-depth-1">(</span><span class="org-variable-name">Leg</span>, <span class="org-variable-name">J</span><span class="org-rainbow-delimiters-depth-1">)</span>
 | 
						|
    max_disp = zeros<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">6</span>, <span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    max_disp<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-3">[</span><span class="org-highlight-numbers-number">1</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-3">]</span>'<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    max_disp<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">2</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-3">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">1</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-3">]</span>'<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    max_disp<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">3</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-3">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">1</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-3">]</span>'<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    max_disp<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">4</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-3">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">1</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-3">]</span>'<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    max_disp<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">5</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-3">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">1</span> <span class="org-highlight-numbers-number">0</span><span class="org-rainbow-delimiters-depth-3">]</span>'<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
    max_disp<span class="org-rainbow-delimiters-depth-1">(</span><span class="org-highlight-numbers-number">6</span><span class="org-rainbow-delimiters-depth-1">)</span> = Leg.stroke<span class="org-type">/</span>max<span class="org-rainbow-delimiters-depth-1">(</span>abs<span class="org-rainbow-delimiters-depth-2">(</span>J<span class="org-type">*</span><span class="org-rainbow-delimiters-depth-3">[</span><span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">0</span> <span class="org-highlight-numbers-number">1</span><span class="org-rainbow-delimiters-depth-3">]</span>'<span class="org-rainbow-delimiters-depth-2">)</span><span class="org-rainbow-delimiters-depth-1">)</span>;
 | 
						|
<span class="org-keyword">end</span>
 | 
						|
</pre>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
</div>
 | 
						|
<div id="postamble" class="status">
 | 
						|
<p class="author">Author: Thomas Dehaeze</p>
 | 
						|
<p class="date">Created: 2019-08-26 lun. 11:55</p>
 | 
						|
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
 | 
						|
</div>
 | 
						|
</body>
 | 
						|
</html>
 |