速度分量：=b cos e6 y=-asin 00 y XB=0,=0 B b ye =(a +b)cose 0 M(x,y) X 产g=-(a+b)sin0=-c C .0= (a b)sin 0 16 p y B c  b r M(x,y ) a x y  速度分量:       sin cos y a x b = − = y a b c y a b x x B B B B = − + = − = + = =      ( )sin ( )cos 0, 0   (a b)sin c +  =  16