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楼主 |
发表于 2008-11-6 18:51
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这个程序更全面一些
clc;
N=5;
ha=1;ns=20;
z1=40;z2=33;z3=106;m=0.003;a=22*pi/180; pb=pi*m*cos(a);
ra1=m*z1/2+ha*m;ra2=m*z2/2+ha*m;ra3=m*z3/2-ha*m;
rb1=m*z1*cos(a)/2; rb2=m*z2*cos(a)/2; rb3=m*z3*cos(a)/2;
%mass
ms=4.75;m1=2.88;m2=2.88;m3=2.88;mr=16.92;
%j1=m1*rb1^2;j2=m2*rb2^2;j3=m3*rb3^2;
M=[ms,0,0,0,0;
0,m1,0,0,0;
0,0,m2,0,0;
0,0,0,m3,0;
0,0,0,0,mr];
%%%刚度
l1=sqrt(ra1^2-rb1^2)+sqrt(ra2^2-rb2^2)-(m*z1/2+m*z2/2)*sin(a);
l2=sqrt(ra2^2-rb2^2)-(sqrt(ra3^2-rb3^2)-(m*z3/2-m*z2/2)*sin(a));
e1=l1/pb;e2=l2/pb;
w=2*pi*ns*z1;T=2*pi/w;
Ks1=1.0e8;Ks2=6.0e7;Asp1=(Ks1+Ks2)/2;Asp2=(Ks1-Ks2)/2;
AKs=Ks1*(e1-1)+Ks2*(2-e1);
Kr1=1.2e8;Kr2=8e7;Arp1=(Kr1+Kr2)/2;Arp2=(Kr1-Kr2)/2;
AKr=Kr1*(e2-1)+Kr2*(2-e2);
%C阻尼
c0=0.07
cs=2*c0*square(AKs/(1/ms+1/m1));
cr=2*c0*square(AKr/(1/mr+1/m1));
cs1=cs;cs2=cs;cs3=cs;
cr1=cr;cr2=cr;cr3=cr;
C=[cs1+cs2+cs3, cs1 , cs2 , cs3 , 0;
cs1 , (cs1+cr1), 0 , 0 , -cr1;
cs2 , 0 , (cs1+cr2) , 0 , -cr2;
cs3 , 0 , 0 ,(cs1+cr3) , -cr3;
0 , -cr1 , -cr2 , -cr3 ,cr1+cr2+cr3]
%step
d=40000;
totaltime=0.01;
tt=totaltime*d+2;
%totaltime?????????tt????????????????d???
u=zeros(N,tt);du=zeros(N,tt);ddu=zeros(N,tt);
fs1=zeros(1,tt);fs2=zeros(1,tt);fs3=zeros(1,tt);
fr1=zeros(1,tt);fr2=zeros(1,tt);fr3=zeros(1,tt);
Gs1=zeros(1,tt);Gr1=zeros(1,tt);
u(:,1)=[0;0;0;0;0];
du(:,1)=[0;0;0;0;0];
ddu(:,1)=[0;0;0;0;0];
%nuwmark参
b=0.25; r=0.5; dt=1/d;
a0=1/(b*(dt)^2); a1=r/(b*dt);
a2=1/(b*dt); a3=1/(2*b)-1;
a4=r/b-1; a5=0.5*dt*((r/b)-2);
a6=dt*(1-r); a7=r*dt;
f=zeros(N,tt);
Ef=zeros(N,tt);
t1=1;
%force
TD=90;
TL=0;
for t=0:1/d:totaltime
%??detat=0.1???t=0:0.1:totalt
f(:,t1)=[TD;0;0;0;TL];
t1=t1+1;
end
t1=1;
for t=0:1/d:totaltime
ks1=Asp1+Asp2*square(w*t,(e1-1)*100);
ks2=Asp1+Asp2*square(w*(t+z1/3*T),(e1-1)*100);
ks3=Asp1+Asp2*square(w*(t+z1*2/3*T),(e1-1)*100);
kr1=Arp1+Arp2*square(w*t,(e2-1)*100);
kr2=Arp1+Arp2*square(w*(t-z3/3*T),(e2-1)*100);
kr3=Arp1+Arp2*square(w*(t-z3*2/3*T),(e2-1)*100);
ksu=0; kru=8000;
K=[ks1+ks2+ks3+ksu, ks1 , ks2 , ks3 , 0;
ks1 , (ks1+kr1) , 0 , 0 ,-kr1;
ks2 , 0 ,(ks1+kr2) , 0 ,-kr2;
ks3 , 0 , 0 , (ks1+kr3),-kr3;
0 , -kr1 , -kr2 , -kr3 ,kr1+kr2+kr3+kru]
%EK?????????
EK=K+a0*M+a1*C;
%??t+detat????????
Ef(:,t1+1)=f(:,t1+1)+M*(a0*u(:,t1)+a2*du(:,t1)+a3*ddu(:,t1))...
+C*(a1*u(:,t1)+a4*du(:,t1)+a5*ddu(:,t1));
%??t+detat??????
u(:,t1+1)=inv(EK)*Ef(:,t1+1);
%??t+detat??????????
ddu(:,t1+1)=a0*(u(:,t1+1)-u(:,t1))-a2*du(:,t1)-a3*ddu(:,t1);
du(:,t1+1)=du(:,t1)+a6*ddu(:,t1)+a7*ddu(:,t1+1);
fs1(t1)=ks1*(u(1,t1)+u(2,t1)); fs2(t1)=ks2*(u(1,t1)+u(3,t1)); fs3(t1)=ks1*(u(1,t1)+u(4,t1));
fr1(t1)=kr1*(u(5,t1)-u(2,t1));fr2(t1)=kr1*(u(5,t1)-u(3,t1)); fr3(t1)=kr1*(u(5,t1)-u(4,t1));
Gs1(t1)=3*rb1*max(max(fs1(t1),fs2(t1)),fs3(t1))/TD;
% Gr1(t1)=3*rb3*max(max(fr1(t1),fr2(t1)),fr3(t1))/TL;
t1=t1+1;
end
t=0:1/d:totaltime+1/d;
subplot(2,2,1),plot(t/T,u(1,:)),xlabel('t/T'),ylabel('u');
subplot(2,2,2),plot(t/T,du(1,:)),xlabel('t/T'),ylabel('du');
subplot(2,2,3),plot(t/T,ddu(1,:)),xlabel('t/T'),ylabel('ddu');
subplot(2,2,4),plot(t/T,Gs1),xlabel('t/T'),ylabel('R1');
grid;
clear |
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