The addition of a zero to second order system 1 1 0<5<1 R(S)= Z= S T C(s) o2(S+1) 02(s+z) R(s) s2+260ns+07 z(s2+250nS+0) 0-1。wu发 a5V1-52 Z 2 a z 为( 2 ) ( ) 2 ( 1) ( ) ( ) 2 2 2 2 2 2 n n n n n n z s s s z s s s R s C s                0    1  1 z  s R s 1 ( )  ) 1 1 sin( 1 1 1 ( 2) ( ) 1 2 2 2 1 2 2                    a a e t tg a a a c t n t n n z a   The addition of a zero to second order system