lAB=75; lBC=135; lCD=120; lAD=165;lBE=60;lED=35;%赋值
r1=0:1:360;%曲柄转角0°~360°，每隔1°作为一个计算步长
r1=r1*pi/180;%转化为弧度制
A=-2*lAB*lBC*sin(r1); B=2*lBC*(lAD-lAB*cos(r1));
C=lAB.^2+lBC.^2+lAD.^2-lCD.^2-2*lAB*lAD*cos(r1);%定义三个参数
r2=2*atan((A+sqrt(A.^2+B.^2-C.^2))./(B+C));%计算杆BC与x轴正方向夹角
xF=-165+75*cos(r1)+60*cos(r2)-35*sin(r2);
yF=75*sin(r1)+60*sin(r2)+35*cos(r2);%求F点的x、y坐标
plot (xF,yF);
title('位移图象')
xlabel (' x') , ylabel ( ' y')%绘制F点运动轨迹图
vxF=diff(xF,t);
vyF=diff(yF,t);
axF=diff(xF,t,2);
ayF=diff(yF,t,2);
