?? ch7_1_2.htm
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<FONT COLOR="#0000FF">7.1.2 ¤Gºû¤º´¡</FONT></H1>
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<BR>¤Gºû¤º´¡»P¤@ºû¤º´¡ªº®t§O¬O­n¤º´¡ªº¼Æ¾Ú¬O¤Gºû¡A§Y¬O
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<BR><IMG SRC="img00007-2.gif" tppabs="http://166.111.167.223/computer/cai/matlabjc/img00007.gif" HEIGHT=22 WIDTH=300>
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<BR>MATLABªº¤Gºû¤º´¡¨ç¼Æ¬O<FONT COLOR="#FF0000">interp2</FONT>¡A¨ä»yªk¬°<FONT COLOR="#FF0000">interp2(X,Y,Z,XI,YI)</FONT>¡A¨ä¤¤ªº<FONT COLOR="#FF0000">X,Y,Z</FONT>¬O­ì¤wª¾ªº¼Æ¾Úªº<I>x,y,z</I>
­È¡A³o²Õ¾Ú¾Úªº·N¸q¬O<FONT FACE="Times New Roman">
<I>Z=Z(X,Y)</I></FONT>¡C¥t¥~<I>Z</I> ¯x°}¤j¤p¥²¶·¬O<IMG SRC="img00008-2.gif" tppabs="http://166.111.167.223/computer/cai/matlabjc/img00008.gif" HEIGHT=17 WIDTH=52>¡A¦Ó<FONT COLOR="#FF0000">XI,YI</FONT>«h¬O­n¤º´¡ªº¼Æ¾ÚÂI¡C¦pªG
»yªk¬O<FONT COLOR="#FF0000">interp2(X,Y,Z,XI,YI,'method')</FONT>¡A<FONT COLOR="#FF0000">method</FONT>¥i¥H³]©w¤º´¡¤èªk¦³<FONT COLOR="#FF0000">linear</FONT>,<FONT COLOR="#FF0000">cubic</FONT>¡A¤À§O¬O¤@¦¸©M¤T¦¸¤èµ{¦¡¡A
¨ä¤¤¹w³]¤èªk¬O<FONT COLOR="#FF0000">linear</FONT>¡C§Ú­Ì¥H¤U­±ªº¨Ò¤l»¡©ú¡C°²³]¦³¤@­Ó¨T¨®¤ÞÀºªºÂà³t¡]³æ¦ì¬°rpm¡^¡B·Å«×»P®É
¶¡¡]³æ¦ì¬°sec¡^ªº¶q´ú­È¦p¤U
<TABLE BORDER >
<TR>
<TD WIDTH="66">time
</TD>
<TD COLSPAN="3" WIDTH="224">speed
</TD>
</TR>
<TR>
<TD WIDTH="66">0
</TD>
<TD WIDTH="72">2000 rpm
</TD>
<TD WIDTH="76">3000 rpm
</TD>
<TD WIDTH="76">4000 rpm
</TD>
</TR>
<TR>
<TD WIDTH="66">1
</TD>
<TD WIDTH="72">20
</TD>
<TD WIDTH="76">110
</TD>
<TD WIDTH="76">176
</TD>
</TR>
<TR>
<TD WIDTH="66">2
</TD>
<TD WIDTH="72">60
</TD>
<TD WIDTH="76">180
</TD>
<TD WIDTH="76">220
</TD>
</TR>
<TR>
<TD WIDTH="66">3
</TD>
<TD WIDTH="72">68
</TD>
<TD WIDTH="76">240
</TD>
<TD WIDTH="76">349
</TD>
</TR>
<TR>
<TD WIDTH="66">4
</TD>
<TD WIDTH="72">77
</TD>
<TD WIDTH="76">310
</TD>
<TD WIDTH="76">450
</TD>
</TR>
<TR>
<TD WIDTH="66">5
</TD>
<TD WIDTH="72">110
</TD>
<TD WIDTH="76">405
</TD>
<TD WIDTH="76">503
</TD>
</TR>
</TABLE>
¨ä¤¤·Å«×ªº¼Æ¾Ú±q<FONT FACE="Times New Roman">
20<SUP>o</SUP>C</FONT>Åܤƨì<FONT FACE="Times New Roman">
503<SUP>o</SUP>C</FONT>¡A¦pªG­n¦ô­p¦b<FONT FACE="Times New Roman">t=2.6,
sec, rpm=2500 </FONT>ªº·Å«×¡A¥i¥H¤U¦C«ü¥O­pºâ
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> d2(:,1)=[0 1 2 3
4 5]'; % </FONT>±N®É¶¡¿é¤J</FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> d2(:,2)=[2000 20
60 68 77 110]'; % </FONT>±N<FONT FACE="Times New Roman"> rpm=2000
</FONT>ªº·Å«×¿é¤J</FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> d2(:,3)=[3000 110
180 240 310 405]'; % </FONT>±N<FONT FACE="Times New Roman"> rpm=3000
</FONT>ªº·Å«×¿é¤J</FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> d2(:,4)=[4000 176
220 349 450 503]'; % </FONT>±N<FONT FACE="Times New Roman"> rpm=4000
</FONT>ªº·Å«×¿é¤J</FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> t=d2(2:6,1); % </FONT>¿ï¾Ü°µ¤º´¡ªº®É¶¡</FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> rpm=d2(1,2:4); %
</FONT>¿ï¾Ü°µ¤º´¡ªº<FONT FACE="Times New Roman">
rpm</FONT></FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> temp=d2(2:6,2:4);
% </FONT>¿ï¾Ü°µ¤º´¡ªº·Å«×</FONT>
<BR>
<BR><FONT COLOR="#FF0000"><FONT FACE="Times New Roman">>> temp_i=interp2(rpm,t,temp,2500,2.6)
% </FONT>¥H½u©Ê¤º´¡¨M©w<FONT FACE="Times New Roman">
rpm=2500,t=2.6 </FONT>ªº·Å«×</FONT>
<BR>
<BR><FONT FACE="Times New Roman"><FONT COLOR="#FF0000">temp_i =</FONT></FONT>
<BR>
<BR><FONT FACE="Times New Roman"><FONT COLOR="#FF0000">140.4000</FONT></FONT>
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