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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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2 <HTML>
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3 <HEAD>
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4 <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=windows-1252">
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5 <TITLE></TITLE>
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6 <META NAME="GENERATOR" CONTENT="OpenOffice.org 3.1 (Win32)">
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7 <META NAME="CREATED" CONTENT="0;0">
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8 <META NAME="CHANGEDBY" CONTENT="Adrien G">
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9 <META NAME="CHANGED" CONTENT="20090827;17232200">
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10 </HEAD>
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11 <BODY LANG="en-US" DIR="LTR">
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12 <P>Built-in models enable to build fast predefined models to use
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13 later in simulations.</P>
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14 <H2>Using existing built-in models</H2>
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15 <P>The constructor can be called using either of the following
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16 syntax:</P>
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17 <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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18 <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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19 If the user does not know the model name/number, then he may use the
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20 following call to see the list of all models :</P>
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21 <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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22 This way the numbers and names are displayed in an error message.
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23 </P>
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24 <P STYLE="margin-bottom: 0cm">Note that the numbers may change if a
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25 new model is added, and using the name is highly recommended.</P>
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26 <P STYLE="margin-bottom: 0cm"><BR>
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27 </P>
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28 <P STYLE="margin-bottom: 0cm">The LTPDA includes one mass-spring
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29 model which can be generated :</P>
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30 <P STYLE="margin-bottom: 0cm"><BR>
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31 </P>
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32 <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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33 M: running ssm/ssm
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34 M: running ssmFromBuiltinSystem
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35 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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36 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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37 M: running buildParamPlist
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38 M: running ssm/ssm
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39 M: running ssm/ssm
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40 M: running fromStruct
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41 M: running ssm/ssm
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42 M: running validate
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43 M: running validate
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44 M: running display
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45 ------ ssm/1 -------
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46 amats: { [2x2] } [1x1]
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47 mmats: { [2x2] } [1x1]
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48 bmats: { [2x1] [2x2] } [1x2]
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49 cmats: { [1x2] } [1x1]
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50 dmats: { [] [1x2] } [1x2]
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51 timestep: 0
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52 inputs: [1x2 ssmblock]
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53 1 : U | Fu [kg m s^(-2)]
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54 2 : N | Fn [kg m s^(-2)], On [m]
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55 states: [1x1 ssmblock]
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56 1 : standard test system | x [m], xdot [m s^(-1)]
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57 outputs: [1x1 ssmblock]
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58 1 : Y | y [m]
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59 params: (empty-plist) [1x1 plist]
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60 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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61 Ninputs: 2
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62 inputsizes: [1 2]
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63 Noutputs: 1
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64 outputsizes: 1
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65 Nstates: 1
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66 statesizes: 2
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67 Nparams: 0
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68 isnumerical: true
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69 hist: ssm.hist [1x1 history]
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70 procinfo: (empty-plist) [1x1 plist]
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71 plotinfo: (empty-plist) [1x1 plist]
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72 name: standard_system_params
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73 description: standard spring-mass-dashpot test system
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74 mdlfile:
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75 UUID: 4415784d-79d9-408d-9b82-3f39ace0d518</PRE></DIV><H2>
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76 Options for the built-in constructor</H2>
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77 <P>There are two options:</P>
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78 <UL>
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79 <LI><P>NAME and DESCRIPTION allow to set the object's name and
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80 description in the constructor</P>
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81 <LI><P>DIM allows to reduce the model to 3, 2 or 1 dimension. Lower
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82 dimension models are built using the 3D model and deleting
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83 inputs/states/outputs. The consequence is that parameters that
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84 affect primarily the 3D model may still remain in the 1D model in
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85 the &bdquo;params&ldquo; field, but also in the matrices if they
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86 have a small effect on the 1D dynamics.</P>
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87 <LI><P>WITHPARAMS allows to keep selected parameters symbolic, to
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88 modify their value later. However current issues with MuPad make the
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89 use of multiple symbolic systems complicated, as the symbolic
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90 parameters are global variable with problematic side effects. The
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91 keyword 'ALL' returns the system with all its parameters symbolic.</P>
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92 <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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93 &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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94 &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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95 Trying sys.isStable with the first and the third system shows a
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96 different result, the negative stiffness making the latter unstable.</P>
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97 </UL>
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98 <UL>
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99 <LI><P>SETNAMES and SETVALUES allow to set the value for parameters,
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100 including those which are not kept symbolic. The first field is a
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101 cell array of strings, the second is a double array of the
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102 corresponding values.</P>
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103 </UL>
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104 <H2>How to make your own built-in model?</H2>
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105 <P>The model must exist as a function mfile in the built-in folders
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106 defined in the LTPDA preferences panel. The file name must be
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107 &ldquo;ssm_model_&lt;model name&gt;.m&rdquo; .</P>
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108 <P>A good template to start writing a file should be
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109 &ldquo;ssm_model_standard_system_params.m&rdquo;. The model should
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110 support all the options above, and the use of the ssm &ldquo;structure&ldquo;
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111 constructor is recommended because it does not increment the history.</P>
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112 <P><BR><BR>
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113 </P>
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114 </BODY>
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115 </HTML>