求助：为什么我用MATLAB计算的临界转速与论坛程序计算的差了很多
clcclear
l1=0.075;l2=0.036;l3=0.068;l4=0.056;l5=0.02;l6=0.09;l7=0.09;l8=0.0925;l9=0.0925;l10=0.09;l11=0.09;
l12=0.035;l13=0.046;l14=0.071;l15=0.033;l16=0.046;
m1=3.305;m2=5.025;m3=5.22;m4=7.355;m5=6.3;m6=11.195;m7=17.5;m8=17.27;m9=17.065;m10=16.962;
m11=16.86;m12=11.28;m13=6;m14=6.82;m15=5.245;m16=4.88;m17=3.305;
I1=1.01e-5;I2=1.19e-5;I3=1.4e-5;I4=2.48e-5;I5=7.85e-5;I6=5.15e-5;I7=5.15e-5;I8=5.15e-5;I9=5.15e-5;
I10=5.15e-5;I11=5.15e-5;I12=4.6e-5;I13=2.48e-5;I14=1.4e-5;I15=1.19e-5;I16=1.01e-5;
v1=2.7648;v2=13.02;v3=3.9472;v4=7.7487;v5=108;v6=4.36;v7=4.36;
v8=4.12;v9=4.12;v10=4.36;v11=4.36;v12=27;v13=11.48;v14=3.62;v15=15.49;v16=7.34;
u=0.3;
E=2.0e11;
k1=1.0e9;
L=;
I=;
M=;
j1=22.1;j2=44.2;j3=44.8;j4=45.4;j5=44.8;j6=44.2;j7=22.1;
J=;
K=;
V=;
%V=;
q1=3093;q2=6186;q3=6271.75;q4=6350;q5=6271.75;q6=6186;q7=3093;
Q=;
k=0;
for w=0:0.01:10000;
for i=1:17;
T(:,:,i)=[1+(L(i)^3)*(1-V(i))*(M(i)*w^2-K(i))/(6*E*I(i)) L(i)+L(i)^2*J(i)*w^2/(2*E*I(i)) L(i)^2/(2*E*I(i)) L(i)^3*(1-V(i))/(6*E*I(i)) L(i)^3*(1-V(i))/(6*E*I(i))*Q(i);
(L(i)^2)*(M(i)*w^2-K(i))/(2*E*I(i)) 1+L(i)*J(i)*w^2/(E*I(i)) L(i)/(E*I(i)) L(i)^2/(2*E*I(i)) L(i)^2/(2*E*I(i))*Q(i);
L(i)*(M(i)*w^2-K(i)) J(i)*w^2 1 L(i) L(i)*Q(i);
M(i)*w^2-K(i) 0 0 1 Q(i);
0 0 0 0 1];
end
H=T(:,:,1);
for i2=2:17;
H=T(:,:,i2)*H;
end
F=H(3,1)*H(4,2)-H(3,2)*H(4,1);
if F*(-1)^k < 0
k=k+1;
wi(k)=w;
w=wi(k)
ni(k)=wi(k)*30/pi
end
end
最后算出来的结果是 w =
3.0927e+003
ni =
2.9533e+004（只算了w<10000的）
而论坛程序算出来前三阶为
CriticalSpeeds =
1.0e+004 *
0.3221
0.6184
0.8023
是我的程序错了吗，请高手指教
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