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zyxzyh921

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tgvictor99

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¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ÃÃÖ½£¬³ÌÐòÀïµÄk2Äãд´íÁË£¬Ó¦¸ÃÊdzýÒÔp0.,ÄãÔõôд³ÉÁËk2=sqrt(r1*Ec*E0/x);Ó¦¸ÃÊÇ£º
k2=sqrt(r1*Ec*E0/p0);
ÿ¸öÈ˵ÄÈËÉú¶¼ÊÇʱ´úµÄ²úÎÿ¸öÈ˵ÄѪͳ¡¢ÃüÔ˺ÍÃÎÏë×é³ÉÁËÏÖÔÚÕâ¸öʱ´ú¡£
2Â¥2013-07-10 17:11:53
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zyxzyh921: ½ð±Ò+20, ¡ï¡ï¡ïºÜÓаïÖú, »Ò³£¸Ðл~ ÎÊÌâ½â¾öÁË~~~ 2013-07-11 10:03:59
1.½âxÓÐÐéÊýÎÊÌâ
½â´ð£º°ÑxµÄ³õֵȡһµã£¬È¡0.01£¬¾Í²»»á³öÏÖÐéÊýÁË£º

function zyxzy
clear all;clc
format long
x0=0.01;
options=optimset('Display','iter');    %´´½¨options½á¹¹±äÁ¿£¬ÆäÖÐdisplayµÄֵΪiter£¬
[x,fval]=fsolve(@myfun,x0,options)


function f=myfun(x)
r1=0.001;
rn=0.02;
Ec=4653000;
E0=8.85e-12;
U=25000;
k1=sqrt(r1*Ec*x/E0);
k2=sqrt(r1*Ec*E0/x);
k3=sqrt(k2^2-r1^2);
f1=sqrt(rn^2+k2^2-r1^2);
f=U-k1*(f1-k2+k3*(log(rn/r1)+log(k2+k3)-log(k3+f1)));


½á¹û£º

                                         Norm of      First-order   Trust-region
Iteration  Func-count     f(x)          step         optimality    radius
     0          2    4.59128e+008                     4.26e+010               1
     1          3    4.59128e+008      0.0107764      4.26e+010               1
     2          5      2.462e+008      0.0026941       3.6e+010         0.00269
     3          7     4.3381e+007     0.00673525      4.09e+010         0.00674
     4          9    1.46051e+006     0.00106182       5.2e+009         0.00674
     5         11         1394.16    0.000280992      1.51e+008         0.00674
     6         13      0.00124421   9.23407e-006      1.42e+005         0.00674
     7         15    4.93763e-016   8.73987e-009         0.0897         0.00674
     8         17               0   5.50577e-015              0         0.00674

Equation solved.

fsolve completed because the vector of function values is near zero
as measured by the default value of the function tolerance, and
the problem appears regular as measured by the gradient.

<stopping criteria details>


x =

   0.001922707332546


fval =

     0

2.°Ñp0=0.0019,´ú»ØÔ­·½³Ì£¬phi=91.8586µÄÎÊÌâ
½â´ð£ºÇë×¢ÒâÄã¹¹½¨µÄmyfunº¯ÊýÖгöÏÖÁË1e-12¼¶±ðµÄ¼«Ð¡ÊýE0£¬Èç¹ûp0È¡0.0019£¬½öÓÐ0.0001µÄ¾«¶È£¬ÕâÑùµÄ¾«¶ÈÓëE0Ïë³Ë³ýÒÔºó£¬Îó²î»á±»¾çÁÒ·Å´ó£¬ËùÒÔphi=91.8586
Èç¹ûÄã´úÈëx =

   0.001922707332546
¾Í»á·¢ÏÖ½á¹ûΪ£º1.469743438065052e-009£¬ÒѾ­·Ç³£½Ó½üÓÚ0ÁË¡£
MATLAB¡¢MSСÎÊÌâ¡¢ÆÕͨÎÊÌâÇë·¢ÌûÇóÖú£¡Ê±¼ä¾«Á¦ÓÐÏÞ£¬Ë¡²»½ÓÊÜÎÞ³¥Ë½ÐÅÇóÖú¡£
3Â¥2013-07-10 17:26:43
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zyxzyh921

½û³æ (³õÈëÎÄ̳)

±¾ÌûÄÚÈݱ»ÆÁ±Î

4Â¥2013-07-10 20:43:33
ÒÑÔÄ   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

tgvictor99

ľ³æ (ÖªÃû×÷¼Ò)

ÃÔºýÁìÓòÈÙÓþÁìÖ÷

ÒýÓûØÌû:
4Â¥: Originally posted by zyxzyh921 at 2013-07-10 20:43:33
ºÇºÇ== Äã¿´Çå³þ¡£¡£³ÌÐòÊÇΪÁ˽âp0 ¡£¡£¡£¡£ ËùÒÔ°Ñp0¿´×öx°¡¡£¡£¡£...

¶î£¬ºÃ°É£¬Ã»¿´Çå³þ¡£
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5Â¥2013-07-11 09:56:30
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zyxzyh921

½û³æ (³õÈëÎÄ̳)

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6Â¥2013-07-12 09:11:57
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