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下面的程序:
syms beta c gama miu theta omiga lambda rho h0 h1 h2 ha x rr r r1 r2 r12 r11 r21 r22 R R11 R12 R21 R22...
n a b w1 w2 v1 v2 va pmax p s n c0 c10 c01 h f;
miu=0.5;r=0.0095;th=0.00242586135181;R=0.0155;theta=pi/4;a=0.01055184698;b=0.002;beta=b/a;ha=0.002;n=1000 ;
%miu=0.5;r=0.0095;th=0.002426;R=0.0155;theta=pi/4;a=0.020;b=0.002;beta=b/a;ha=0.002;n=1000;c0=0.005;
omiga=2*pi*n/60;
p=a/cos(theta);
s=int(sqrt(p^2+(2*pi*rr)^2),rr,r12,(r12+ha));
%-------------------------------------------------------------------
%--------------------------------------------------------------------------
B1=(1-beta)*a;
B2=beta*a;
h2=r21-r12;c=h2;h1=c+ha;gama=ha/c;
h0=(h1*h2*(B1*w1*h2^2+B2*w2*h1^2))/(B1*w1*h2^3+B2*w2*h1^3);
p1=-6*miu*w1/h1^2*(1-h0/h1)*x;
p2=-6*miu*w2/h2^2*(h0/h2-1)*(B1+B2-x);
x=B1;
pmax=p1;
Fp=pmax*s;
%---------------------------------------------------------------
%---------------------------------------------------------------------
L1=sqrt((a/cos(theta))^2+(2*pi*r12)^2);
L2=sqrt((a/cos(theta))^2+(2*pi*(r12+ha))^2);
FB1x=((3*miu*w1*w2/c)*((beta*gama*(1+gama))/((1-beta)*w1+beta*(1+gama)^3*w2))-miu*w1/((1+gama)*c))*L1*(1-beta)*a;
FB1y=-(miu/((1+gama)*c))*v1*(1-beta)*L1*a;
FB2x=(-(3*miu*w1*w2/c)*((gama*(1-beta))/((1-beta)*w1+beta*(1+gama)^3*w2))-miu*w2/c)*beta*a*L2;
FB2y=-miu/c*v2*beta*a*L2;
%----------------------------------------------------------------
w1=va*cos(theta)-omiga*r12*sin(theta);
w2=va*cos(theta)-omiga*(r12+ha)*sin(theta);
v1=va*sin(theta)+omiga*r12*cos(theta);
v2=va*sin(theta)+omiga*(r12+ha)*cos(theta);
Fp=subs(Fp);FB1x=subs(FB1x);FB2x=subs(FB2x);FB1y=subs(FB1y);FB2y=subs(FB2y);
Fx=Fp+FB1x+FB2x;
Fy=FB1y+FB2y;
%--------------------------------------------------------------------------
Fa=Fx*cos(theta)+Fy*sin(theta);
Fc=Fy*cos(theta)-Fx*sin(theta);
%-------------------------------------------------------------
miu=0.5;theta=pi/4;a=0.020;b=0.002;beta=b/a;
ha=0.002;h=0.003;rho=8920;lambda=1; n=1000;
R11=0.0095;R12=0.0096;R21=0.0145;R22=0.0146;c10=115100;c01=101300;c0=0.005;
Fa=subs(Fa);
va=solve(Fa,'va');
va=va(2);%!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
%--------------------------------------------------------------------------
%--------------------------------------------------------------------------
P1=rho*omiga^2*(r11^3-(r11-h)^3)/(3*r11);
%-------------------------------------------------------
f1=2/r*(((R12^2-(r12^2-r^2)*lambda)/(lambda*r)^2-r^2/(R12^2-(r12^2-r^2)*lambda))*c10-...
(((lambda*r)^2/(R12^2-(r12^2-r^2)/lambda))-(R12^2-(r12^2-r^2)*lambda)/r^2)*c01);
f1=subs(f1);
sigma1=int(f1,r,r11,r12);
r11=sqrt(r12^2-(R12^2-R11^2)/lambda);
sigma1=subs(sigma1);
f2=2/r*(((R22^2-(r22^2-r^2)*lambda)/(lambda*r)^2-r^2/(R22^2-(r22^2-r^2)*lambda))*c10-...
(((lambda*r)^2/(R22^2-(r22^2-r^2)/lambda))-(R22^2-(r22^2-r^2)*lambda)/r^2)*c01);
f2=subs(f2);
sigma2=int(f2,r,r21,r22);
r22=sqrt(r21^2+(R22^2-R21^2)/lambda);
sigma2=subs(sigma2);%柔弹性壁的应力
%-----------------------------------------------------------
P2=pmax/2;
P2=subs(P2);
%------------------------------------------------------------
P1=subs(P1);
t1=subs(P2-P1-sigma1);
t2=subs(sigma2-P2);
最后解出的t1,t2都是关于r12,r21的方程,我想解出r12和r21的值。用solve解的时候出了问题,我查了查以前的帖子,是方程太复杂了,solve解不了。用fsolve解,初值不好估计。
大家帮忙看看,给提点意见,谢谢了!
[ 本帖最后由 sigma665 于 2008-3-11 21:27 编辑 ] |
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