LrrImlr, D(t)+rMcKx, D()+XkKX,D,(t) Xy[m]{2(r) MD()+CD+KD()=一{XH四m]{() M={XHm{x-振型广义质量 K={XH[k]xb-振型广义刚度 ={X[c{x}--振型广义阻尼系数 D,()+D D,(t) M M M Ki=OM C=250, M D()+25a,D1+o2D,()= WLMK LrMLMKY( ) ( )      ( ) * * * M D t C D K D t X m I x t g T j j j j j j j   +  + = − * 2 * Kj = j M j * * Cj = 2 j  j M j           ( ) 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    − +   + =                     ( ) ( ) ( ) ( ) X m I x t X m X D t X c X D t X k X D t g T j j j T j j j T j j j T j    = − + + =     j T M j = X j m X * ---j振型广义质量 ---j振型广义阻尼系数     j T Kj = X j k X *     j T Cj = X j c X * ---j振型广义刚度      ( ) ( ) ( ) * * * * * x t M X M I D t M K D M C D t g j T j j j j j j j j    − + + =