设某一线性系统或环节的如下图所示: R(s)-[()C(s R 设r(t)= Rsin ot,R(s) s-+ C(s)=G(S)O(s) O(S) R(s) P(s)(S+P(s+p,).(S+P) 并设系统稳定,为讨论问题方便起见,设系统的所有极点 均为实数极点且各不相同,即一P1<0,=1,2,…,n,则有 C(s) O(s) R (S+n1)(S+P2)…(S+pn)s2+ b StO S-a c(t)=ae on +aero+bel c(t)=ae on +aelor设某一线性系统或环节的如下图所示: 设 R(s) G(s) C(s) ( )( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) sin , ( ) 1 2 2 2 pn s p s p s Q s P s Q s G s R s C s s R r t R t R s + + + = = = + = =     并设系统稳定, 为讨论问题方便起见, 设系统的所有极点 均为实数极点且各不相同, 即− pi  0,i =1,2,  ,n , 则有 j t j t s s n i p t i j t j t n i i i n c t a e a e be c t a e a e s p b s j a s j a s R s p s p s p Q s C s   i       = + + = + + + − + + = + + + + = − = − − =   ( ) , ( ) ( )( ) ( ) ( ) ( ) 1 1 2 2 1 2 