五.旋转矢量法 特点：直观方便， 0t+0 x(t)=Acos(@t+p) V=-Asin(+)=OAcos( =A,cos(@t+) a=@2Acos(@t+p+)=A.cos(@t+pa) 五 .旋转矢量法   t +  o x x t t = 0  A A v a v = −Asin( t + ) ) 2 cos(  = A t +  + cos( ) 2 a =  A t +  +  cos( ) = v  +v A t cos( ) a a = A t +  特点 :直观方便 . · · x(t) = Acos( t + )