Rittica转子动力学传递矩阵

奔腾6

请教转子动力学传递矩阵

帮忙看一个转子动力学传递矩阵程序，一直得不到标准的剩余量曲线，还出现振荡，如果哪位前辈以前编过此程序，麻烦给传一个，解燃眉之急啊，多谢谢谢谢谢！！！！！
clear;
l=[0.25,0.5,0.5,0.25,0];
m=[20,20,20,20,20];
Jp=[0.0360,0.0360,0.0360,0.0360,0.0360];
Jd=[0.0180,0.0180,0.0180,0.0180,0.0180];
I=[3.9761e-008,3.9761e-008,3.9761e-008,3.9761e-008,3.9761e-008];
K=[15000000,0,15000000,0,15000000];
E=2.000e+011;
v=[0,0,0,0,0];
S=[0,0;0,0];
s=1;
x=[];
for n=200:800
for i=1:5
u11=[1,l(i);0,1];
u12=[l(i)*(m(i)*n^2-K(i)),(Jp(i)-Jd(i))*n^2;m(i)*n^2-K(i),0];
u21=(l(i)/(E*I(i))).*[l(i)/2,l(i)^2*(1-v(i))/6;1,l(i)/2];
u22=[1+l(i)^3*(1-v(i))*(m(i)*n^2-K(i))/(6*E*I(i)),l(i)+l(i)^2*(Jp(i)-Jd(i))*n^2/(2*E*I(i));l(i)^2*(m(i)*n^2-K(i))/(2*E*I(i)),1+l(i)*(Jp(i)-Jd(i))*n^2/(E*I(i))];
s=sign(det(u21*S+u22))*s;
S=[u11*S+u12]*inv([u21*S+u22]);
end
D=det(S)*s;
x=[x,D];
end
n=200:1:800;
grid on
plot(n,x)




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