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楼主 |
发表于 2008-8-19 09:32
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我自己的程序
主程序:
clear all
Di=0.025; %m
D0=0.047; %m
omegar=1047:4000:8047; %omegar是轴的转速
% omegab=Di/(Di+D0)*omegar; %omegab是滚动体的转速
Qh1=0;
Qh2=0;
Nb=15; %轴承的滚动体个数
syms x; %Jeffcot方程中对应的x(1)
syms y; %Jeffcot方程中对应的x(3)
Gr=2e-5; %轴承的径向游隙,单位m
for omegab=Di/(Di+D0)*omegar
for t=1:2;
for j=1;
Theta=2*pi*(j-1)/Nb+omegab*t;
a=vpa((x*cos(Theta)+y*sin(Theta)-Gr),2);
% keyboard
Qh1=vpa(Qh1+a.^1.5*cos(Theta),2);
Qh2=vpa(Qh2+a.^1.5*sin(Theta),2);
end
end
end
global qh1 qh2;
qh1=Qh1,qh2=Qh2;
t0=[0,150];
x0=[1;0;0;0];
%bifurcation
% for omegar=1047:10:8397
[t,x]=ode45('Jeffcott',t0,x0);
plot(t,x)
子程序:
function dx=Jeffcott(t,x)
global qh1 qh2;
m=1; %kg
Fr=5; %N
kn=4.5829e13; %N/m
c=300; %(N*s/m)
dx=zeros(4,1);
dx(1)=x(2);
dx(2)=(Fr-c*x(2)-kn*34)/m;
dx(3)=x(4);
dx(4)=(-c*x(4)-kn*45)/m; |
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