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global Omega1;
global b1;
global r;
global s;
global alfa1;
global beta1;
G=8E10;
K=1.2;
E=2.06e11;
P=7.9e3;
L=4;
D=0.8;
H=0.2;
k=1/K;
I=D*(H^3)/12;
A=D*H;
Omega1=linspace( 0,sqrt((k*G*A)/(P*I)),10000);
b1=sqrt(P*A/(E*I)).*Omega1;
r=sqrt(I/A);
s=sqrt(E*I/(k*A*G));
alfa1=b1.*sqrt(-(r^2+s^2)+sqrt((r^2-s^2)^2+4./(b1.^2)))/sqrt(2);
beta1=b1.*sqrt(r^2+s^2+sqrt((r^2-s^2)^2+4./(b1.^2)))/sqrt(2);  
  clamped_clamped1=2-2*cosh(alfa1.*L).*cos(beta1.*L)-(b1./sqrt(1-b1.^2*r^2*s^2)).*(r^2-3*s^2-(b1.^2*s^2)*(r^2-s^2)^2).*sin(beta1.*L).*sinh(alfa1.*L);%¶¨Ò庯Êý±í´ïʽ
figure(1)
plot(Omega1,clamped_clamped1,'b')
title('clamped_clamped beam1')
hold on
plot(xlim,[0 0],'r')
ÎÒ¾ÍÏëÇó³öclamped_clamped1=0ʱºò£¬Omega1µÄÖµ¡£Ó¦¸ÃÔõôд³ÌÐò°¡£¿£¿£¿£¿
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2Â¥2015-11-07 07:52:11
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Òø³æ (ÕýʽдÊÖ)

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2Â¥: Originally posted by ¿¨¶ûÙÂ˹ at 2015-11-07 07:52:11
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