D,(t)+25,0,D1+2D,(t) XLMR LrIMKr s(o) KrYM ∑mxn YjX)L MRY j振型的振型参与系数 D()+25D+o2D()=-yx2(t) x(t)}=∑(HD() ()=∑xD()          ( ) 2 ( ) ( ) 2 x t X M X X M I D t D D t g j T j T j j j j j j j    − +   + =             = = = = n i i j i n i i j i j T j T j j m x m x X M X X M I 1 2 1  ---j振型的振型参与系数 ( ) 2 ( ) ( ) 2 D t D D t x t j j j j j j j g    +   + = −     = = N i i i x t X D t 1 ( ) ( ) = = N j i ji j x t x D t 1 ( ) ( )