4根轨迹举例 41GG(s)= K(s+3) (s+1)(s+2) 4.2GG(s)= K(S+3) (S+1)(s+2(s+46 4 根轨迹举例 4.1 ( 3) ( ) ( 1)( 2) c K s GG s s s + = + + 4.2 ( 3) ( ) ( 1)( 2)( 4) c K s GG s ss s + = ++ +