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Í­³æ (СÓÐÃûÆø)

[ÇóÖú] ½ô¼±ÇóÖúduffingËã×ӵķùƵ·Ö²íÇúÏß¼°Õû¸ö·½³ÌµÄ·Ö²íͼmatlab´úÂë

ÇóduffingËã×ӵķùƵ·Ö²íÇúÏß¼°Õû¸ö·½³ÌµÄ·Ö²íͼmatlab´úÂ룬ÈçÓв»Éõ¸Ð¼¤£¡£¡
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ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï ¡ï
¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
ÂäÔÂËæ·ç: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú, ÎÒÏëÒª·Ö²í¹ý¶Èµ½»ìãçµÄͼ£¬²»¹ý»¹ÊǸÐл 2012-04-12 21:59:45
ÒÔǰ°ï±ðÈËдµÄ´úÂ룬²»ÖªÊÇ·ñÄãÏëÒªµÄ
¿½µ½editorÖб£´æÎª.mÎļþ£¬µã»÷runÔËÐÐ
±¶ÖÜÆÚ·Ö²íͼ
CODE:
function AA

global mu w F;
mu=0.3;w=1.2;
cF=[0.20 0.27 0.289 0.293 0.32 0.35 0.37 0.4 0.65 0.7];
k=0;
for F=cF
    k=k+1;
[t,x]=ode45(@duffing,[0,2000],[2,0.01]);
x1=x(:,1);
count=find(t>1800);
Y=x1(count,:);
t1=t(count,:);
subplot(5,2,k)
plot(t1,Y)
xlabel('t');
ylabel('x ');
s=['t=0 x=2 y=0.01 F=',num2str(F)];
title(s);
end

function dx=duffing(t,x)
global mu w F;
dx=[x(2);F*cos(w*t)-mu*x(2)+x(1)-x(1).^3];

¶Å·Ò(Duffing)·½³Ì Poincare ½ØÃæÍ¼
CODE:
function aa
global mu w F;
mu=0.05;w=1;
F=7.5;
x0=[1;0.2];
tspan = 0:0.1*2*pi:50000;
[t,y]=ode45(@duffing,tspan,x0);
m=zeros(7000,1);
n=zeros(7000,1);
for i=1:7000
    m(i,1)=y(10*i,1);
    n(i,1)=y(10*i,2);
end
plot(m,n,'k.','markersize',1);

function dx=duffing(t,x)
global mu w F;
dx=[x(2);F*cos(w*t)-mu*x(2)-x(1).^3];

[ Last edited by dbb627 on 2012-4-11 at 15:49 ]
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2Â¥2012-04-11 15:43:29
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

½á¹ûÈçͼËùʾ





The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
3Â¥2012-04-11 15:44:56
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zzqmessi

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