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- % 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]
- % 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'); % 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,':');
复制代码 我是刚刚看到的
可能大家以前看过
但还是推荐一下
[ 本帖最后由 ChaChing 于 2009-12-28 14:13 编辑 ] |