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hqulhh

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csgt0

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jjdg: ½ð±Ò+1, ¸Ðл²ÎÓë 2012-08-02 18:25:33
ÆäËûµÄ²ÎÊý¶¼ÓУ¬ËùÒÔ·½³ÌÖÐËùÓÐL¶¼ÓÃy(1), dL/dtÓÃdy(1), G¶¼ÓÃy(2),dG/dtÓÃdy(2)´úÌæ¾Í¿ÉÒÔ¡£
showmethemoney
3Â¥2012-08-02 16:32:27
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
²é¿´È«²¿ 16 ¸ö»Ø´ð

csgt0

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hqulhh: ½ð±Ò+2, ¡ï¡ï¡ïºÜÓаïÖú 2012-08-02 16:54:13
jjdg: ½ð±Ò+1, ¸Ðл²ÎÓë 2012-08-02 18:25:43
¿´Õâ¸ö·½³Ì¾Í²î²»¶à£¬ÆäÖÐy(1)¶ÔÓ¦ÄãµÄL£¬y(2)¶ÔÓ¦G
CODE:
[t,l]=ode45(@fun,[0 1],ones(2,1))

function dy=fun(t,y)
dy=zeros(2,1);
dy(1)=y(1)*t*y(2)^2;
dy(2)=5/y(2);
end

showmethemoney
2Â¥2012-08-02 16:29:29
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

hqulhh

гæ (³õÈëÎÄ̳)

ÒýÓûØÌû:
3Â¥: Originally posted by csgt0 at 2012-08-02 16:32:27
ÆäËûµÄ²ÎÊý¶¼ÓУ¬ËùÒÔ·½³ÌÖÐËùÓÐL¶¼ÓÃy(1), dL/dtÓÃdy(1), G¶¼ÓÃy(2),dG/dtÓÃdy(2)´úÌæ¾Í¿ÉÒÔ¡£

»¹Óиö¦±ÊÇʱ¼ätµÄº¯Êý ¦±=kt
4Â¥2012-08-02 16:53:28
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

csgt0

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

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hqulhh: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú 2012-08-02 17:31:08
jjdg: ½ð±Ò+3, ¸Ðл²ÎÓë 2012-08-02 18:25:23
Äãû·¢ÏÖÄãµÄʽ×ÓÀïûÓÐPô£¬´ó¸ÅÕâ¸öÇé¿ö£¬ÄãÔٸĸİɡ£ÐèҪעÒâ²»ÄܳöÏÖÈÃK=0
CODE:
L0=1;
[t,y]=ode45(@fun,0:100,[L0;1]);
L=y(:,1);
G=y(:,2);
delta=(L-L0)/L0
end

function dy=fun(t,y)
L0=1;
alpha=0.01;
deltaT=10;
C=1;
r=1;
A=1;
B=1;
v=1;
D=1;
Q=1;
R=8.314;

rou=0.5+0.005*t;
sigma=C*rou^2/r;
T=273+10*t;

dy=zeros(2,1);
dy(2)=D*exp(-Q/(R*T))/y(2);

yita=A*T*y(2)^3*rou^2*exp(B/T);
K=yita/3/(1-2*v);

dy(1)=y(1)*(alpha*deltaT-sigma/(3*K));

end

showmethemoney
5Â¥2012-08-02 17:21:37
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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