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Cleanup
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 07 Dec 2011 17:24:36 +0100
parents f0afece42f48
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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2 "http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
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3
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4 <html lang="en">
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5 <head>
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6 <meta name="generator" content=
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7 "HTML Tidy for Mac OS X (vers 1st December 2004), see www.w3.org">
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8 <meta http-equiv="Content-Type" content=
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9 "text/html; charset=us-ascii">
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10
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11 <title>Building from built-in models (LTPDA Toolbox)</title>
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12 <link rel="stylesheet" href="docstyle.css" type="text/css">
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13 <meta name="generator" content="DocBook XSL Stylesheets V1.52.2">
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14 <meta name="description" content=
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15 "Presents an overview of the features, system requirements, and starting the toolbox.">
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16 </head>
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17
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18 <body>
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19 <a name="top_of_page" id="top_of_page"></a>
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20
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21 <p style="font-size:1px;">&nbsp;</p>
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22
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23 <table class="nav" summary="Navigation aid" border="0" width=
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24 "100%" cellpadding="0" cellspacing="0">
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25 <tr>
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26 <td valign="baseline"><b>LTPDA Toolbox</b></td><td><a href="../helptoc.html">contents</a></td>
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27
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28 <td valign="baseline" align="right"><a href=
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29 "ssm_build_description.html"><img src="b_prev.gif" border="0" align=
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30 "bottom" alt="Building from scratch"></a>&nbsp;&nbsp;&nbsp;<a href=
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31 "ssm_modify.html"><img src="b_next.gif" border="0" align=
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32 "bottom" alt="Modifying systems"></a></td>
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33 </tr>
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34 </table>
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35
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36 <h1 class="title"><a name="f3-12899" id="f3-12899"></a>Building from built-in models</h1>
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37 <hr>
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38
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39 <p>
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40 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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41 <HTML>
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42 <HEAD>
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43 <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=windows-1252">
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44 <TITLE></TITLE>
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45 <META NAME="GENERATOR" CONTENT="OpenOffice.org 3.1 (Win32)">
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46 <META NAME="CREATED" CONTENT="0;0">
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47 <META NAME="CHANGEDBY" CONTENT="Adrien G">
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48 <META NAME="CHANGED" CONTENT="20090827;17232200">
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49 </HEAD>
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50 <BODY LANG="en-US" DIR="LTR">
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51 <P>Built-in models enable to build fast predefined models to use
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52 later in simulations.</P>
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53 <H2>Using existing built-in models</H2>
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54 <P>The constructor can be called using either of the following
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55 syntax:</P>
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56 <DIV CLASS="fragment"><PRE><FONT COLOR="#000000">&gt;&gt; system = ssm(plist(</FONT><FONT COLOR="#a020f0">'built-in'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'&lt;model name&gt;'</FONT><FONT COLOR="#000000">))</FONT>
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57 <FONT COLOR="#000000">&gt;&gt; system = ssm(plist(</FONT><FONT COLOR="#a020f0">'built-in'</FONT><FONT COLOR="#000000">, </FONT><FONT COLOR="#a020f0">'&lt;model number&gt;'</FONT><FONT COLOR="#000000">)) </FONT></PRE></DIV><P>
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58 If the user does not know the model name/number, then he may use the
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59 following call to see the list of all models :</P>
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60 <DIV CLASS="fragment"><PRE STYLE="margin-bottom: 0.5cm">&gt;&gt;<FONT COLOR="#000000"> </FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>system = ssm(plist(</FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'built-in'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>, </FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>''</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>))</FONT></FONT></FONT></PRE></DIV><P STYLE="margin-bottom: 0cm">
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61 This way the numbers and names are displayed in an error message.
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62 </P>
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63 <P STYLE="margin-bottom: 0cm">Note that the numbers may change if a
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64 new model is added, and using the name is highly recommended.</P>
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65 <P STYLE="margin-bottom: 0cm"><BR>
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66 </P>
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67 <P STYLE="margin-bottom: 0cm">The LTPDA includes one mass-spring
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68 model which can be generated :</P>
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69 <P STYLE="margin-bottom: 0cm"><BR>
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70 </P>
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71 <DIV CLASS="fragment"><PRE>&gt;&gt; <FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>system = ssm(plist(</FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'built-in'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>, </FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'standard_system_params'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>))</FONT></FONT></FONT>
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72 M: running ssm/ssm
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73 M: running ssmFromBuiltinSystem
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74 M: looking for models in C:\Documents and Settings\Adrien.IFR-NB01\My Documents\MATLAB2008\LTPDA_SSM_MODELS\ltp_ssm_models
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75 M: looking for models in C:\Users\Adrien.IFR-NB01\My Documents\MATLAB2008\ltpda_toolbox\ltpda\classes\@ssm\..\..\m\built_in_models
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76 M: running buildParamPlist
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77 M: running ssm/ssm
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78 M: running ssm/ssm
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79 M: running fromStruct
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80 M: running ssm/ssm
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81 M: running validate
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82 M: running validate
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83 M: running display
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84 ------ ssm/1 -------
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85 amats: { [2x2] } [1x1]
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86 mmats: { [2x2] } [1x1]
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87 bmats: { [2x1] [2x2] } [1x2]
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88 cmats: { [1x2] } [1x1]
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89 dmats: { [] [1x2] } [1x2]
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90 timestep: 0
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91 inputs: [1x2 ssmblock]
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92 1 : U | Fu [kg m s^(-2)]
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93 2 : N | Fn [kg m s^(-2)], On [m]
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94 states: [1x1 ssmblock]
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95 1 : standard test system | x [m], xdot [m s^(-1)]
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96 outputs: [1x1 ssmblock]
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97 1 : Y | y [m]
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98 params: (empty-plist) [1x1 plist]
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99 version: $Id: ssm_build_built_in_content.html,v 1.3 2009/08/28 14:20:07 adrien Exp $--&gt;$Id: ssm_build_built_in_content.html,v 1.3 2009/08/28 14:20:07 adrien Exp $
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100 Ninputs: 2
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101 inputsizes: [1 2]
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102 Noutputs: 1
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103 outputsizes: 1
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104 Nstates: 1
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105 statesizes: 2
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106 Nparams: 0
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107 isnumerical: true
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108 hist: ssm.hist [1x1 history]
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109 procinfo: (empty-plist) [1x1 plist]
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110 plotinfo: (empty-plist) [1x1 plist]
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111 name: standard_system_params
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112 description: standard spring-mass-dashpot test system
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113 mdlfile:
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114 UUID: 4415784d-79d9-408d-9b82-3f39ace0d518</PRE></DIV><H2>
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115 Options for the built-in constructor</H2>
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116 <P>There are two options:</P>
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117 <UL>
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118 <LI><P>NAME and DESCRIPTION allow to set the object's name and
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119 description in the constructor</P>
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120 <LI><P>DIM allows to reduce the model to 3, 2 or 1 dimension. Lower
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121 dimension models are built using the 3D model and deleting
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122 inputs/states/outputs. The consequence is that parameters that
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123 affect primarily the 3D model may still remain in the 1D model in
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124 the &bdquo;params&ldquo; field, but also in the matrices if they
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125 have a small effect on the 1D dynamics.</P>
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126 <LI><P>WITHPARAMS allows to keep selected parameters symbolic, to
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127 modify their value later. However current issues with MuPad make the
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128 use of multiple symbolic systems complicated, as the symbolic
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129 parameters are global variable with problematic side effects. The
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130 keyword 'ALL' returns the system with all its parameters symbolic.</P>
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131 <DIV CLASS="fragment"><PRE>&gt;&gt; system = ssm(plist(<FONT COLOR="#a020f0">'built-in'</FONT>, <FONT COLOR="#a020f0">'standard_system_params'</FONT>, <FONT COLOR="#a020f0">'withparams'</FONT>, {<FONT COLOR="#a020f0">'D'</FONT>}))
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132 &gt;&gt; system = ssm(plist(<FONT COLOR="#a020f0">'built-in'</FONT>, <FONT COLOR="#a020f0">'standard_system_params'</FONT>, <FONT COLOR="#a020f0">'withparams'</FONT>, <FONT COLOR="#a020f0">'ALL'</FONT>))
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133 &gt;&gt; <FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>sys = ssm(plist(</FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'built-in'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>, </FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'standard_system_params'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>, </FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'setnames'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>, {</FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'W'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>}, </FONT></FONT></FONT><FONT COLOR="#a020f0"><FONT FACE="Courier New, monospace"><FONT SIZE=2>'setvalues'</FONT></FONT></FONT><FONT COLOR="#000000"><FONT FACE="Courier New, monospace"><FONT SIZE=2>, 0.2*i ));</FONT></FONT></FONT></PRE></DIV><P>
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134 Trying sys.isStable with the first and the third system shows a
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135 different result, the negative stiffness making the latter unstable.</P>
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136 </UL>
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137 <UL>
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138 <LI><P>SETNAMES and SETVALUES allow to set the value for parameters,
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139 including those which are not kept symbolic. The first field is a
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140 cell array of strings, the second is a double array of the
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141 corresponding values.</P>
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142 </UL>
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143 <H2>How to make your own built-in model?</H2>
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144 <P>The model must exist as a function mfile in the built-in folders
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145 defined in the LTPDA preferences panel. The file name must be
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146 &ldquo;ssm_model_&lt;model name&gt;.m&rdquo; .</P>
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147 <P>A good template to start writing a file should be
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148 &ldquo;ssm_model_standard_system_params.m&rdquo;. The model should
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149 support all the options above, and the use of the ssm &ldquo;structure&ldquo;
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150 constructor is recommended because it does not increment the history.</P>
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151 <P><BR><BR>
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152 </P>
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153 </BODY>
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154 </HTML>
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155 </p>
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156
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157 <br>
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158 <br>
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159 <table class="nav" summary="Navigation aid" border="0" width=
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160 "100%" cellpadding="0" cellspacing="0">
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161 <tr valign="top">
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162 <td align="left" width="20"><a href="ssm_build_description.html"><img src=
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163 "b_prev.gif" border="0" align="bottom" alt=
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164 "Building from scratch"></a>&nbsp;</td>
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165
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166 <td align="left">Building from scratch</td>
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167
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168 <td>&nbsp;</td>
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169
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170 <td align="right">Modifying systems</td>
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171
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172 <td align="right" width="20"><a href=
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173 "ssm_modify.html"><img src="b_next.gif" border="0" align=
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174 "bottom" alt="Modifying systems"></a></td>
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175 </tr>
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176 </table><br>
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177
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178 <p class="copy">&copy;LTP Team</p>
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179 </body>
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180 </html>