% Author's email:zjliu2001@163.com % 阻尼振动 close all 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); % 句柄[弹簧] C=0:.1:2*pi;r=0.3; t1=r*sin(C); F1=fill(13+r*cos(C),2+t1,'r'); % 句柄[球] 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'); % 句柄[绿线] Q=plot(0,2.5,'color','r'); % 运动曲线; 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,':'); [ 本帖最后由 ChaChing 于 2010-3-28 23:50 编辑 ] |
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