阻尼振动的MATLAB程序-matlab_damp.rar

close all web -browser http://www.ilovematlab.cn/thread-12052-1-1.html rectangle('position',[12,8,2,0.3],'FaceColor',[0.1,0.3,0.4]); axis([0,15,-1,10]);hold on plot([13,13],[7,8],'r','linewidth',2); y=2:.2:7;M=length(y); x=12+mod(1:M,2)*2; x(1)=13;x(end-3:end)=13; D=plot(x,y); % ??[??] % Author's email:zjliu2001@163.com C=0:.1:2*pi;r=0.3; t1=r*sin(C); F1=fill(13+r*cos(C),2+t1,'r'); % ??[?] set(gca,'ytick',[0:2:9]); set(gca,'yticklabels',num2str([-1:3]')); plot([0,15],[2,2],'black'); H1=plot([0,13],[2,2],'g'); % ??[??] Q=plot(0,2.5,'color','r'); % ????; td=[];yd=[]; T=0; text(2,8,'damp osillation','fontsize',24); set(gcf,'doublebuffer','on'); while T<12; pause(0.2); Dy=1-0.5*exp(-T/4)*cos(pi*T); Y=-(y-2)*Dy+7; Yf=Y(end)+t1; td=[td,T];yd=[yd,Y(end)]; set(D,'ydata',Y); set(F1,'ydata',Yf,'facecolor',rand(1,3)); set(H1,'xdata',[T,13],'ydata',[Y(end),Y(end)]); set(Q,'xdata',td,'ydata',yd) T=T+0.1; end Kd=find(diff(sign(diff(yd)))==-2)+1; X=td(Kd);Y=yd(Kd); X=[0,X,td(end)]; Y=[yd(1),Y,yd(end)]; plot(X,Y,':'); Kx=find(diff(sign(diff(yd)))==2)+1; X=td(Kx);Y=yd(Kx); X=[0,X,td(end)]; Y=[-(yd(1)-4),Y,-(yd(end)-4)]; plot(X,Y,':');