则输入信号的拉氏变换是 Aw Ao R(S)= 52+02 (s+j0(s-j0) (4-3) 系统的传递函数通常可以写成 M(s) M(s) G(s)= N(s)(s-5)(s-5,)..(s-s,) (4-4) 由此得到输出信号的拉氏变换 C(s)=G(s)R(s) M(s) Aw (s-Ss-52)…(s-5n）(s+j0s-j0) (4-5) b an s+jo s-j@s-S S-S2 S-S 6 6 则输入信号的拉氏变换是 (4-3) 系统的传递函数通常可以写成 (4-4) 由此得到输出信号的拉氏变换 (4-5) 2 2 ( ) ( )( ) A A R s s s j s j      = = + + − 1 2 ( ) ( ) ( ) ( ) ( )( ) ( ) n M s M s G s N s s s s s s s = = − − − 1 2 1 2 1 2 ( ) ( ) ( ) ( ) ( )( ) ( ) ( )( ) n n n C s G s R s M s A s s s s s s s j s j b b a a a s j s j s s s s s s      = =  − − − + − = + + + + + + − − − −