用MATLAB计算受迫振动程序 clear all %sy196.m xc=dsolve('D2x+2*b*Dx+w0^2*x+h*cos(wc*t)=0','Dx(0)=0,x(0)=A','t'); w0=0.3*pi; b=0.1; A=0.2; h=0.4; t=linspace(0,100,1000); i=1; for k=0.1:0.01:2.5 % k=wc/w0 驱动频率与固有频率之比 r(i)=k; wc=k*w0; xc1=eval(xc); a(i)=max(real(xc1)); i=i+1; end subplot(2,1,1) %画受迫振动振幅与频率比之间的关系曲线 plot(r,a，’.-r’) subplot(2,1,2) %画受迫振动曲线 plot(t,xc1,'-b',t,0,'-r')