系统传递函数 G(s)= num sys=tf(num,den) den 10 sys1:G,()=s+2s+5 Transfer function: sys2:G2(s)=- 10 +1 sys3=sysl+sys2 s2+2s+5 Transfer function: numl=[101: den1=[1 25]; s+1 sysl=tf(numl,denl) num2=[1]; Transfer function: den2=[11] s2+12s+15 sys2=tf(num2,den2) sys3=sysl+sys2 s3+3s2+7s+5 School of Mechanical Engineering ME369-Lecture 4.5 Shanghai Jiao Tong University Fall 2015 系统传递函数（续） G6)=k-s-3(s-2) (s-p(s-p)..(s-p) sys=zpk (z,p,k) 2(s+2)(s+7) G(s)= (s+3)(s+7(s+9) 2z=[-2-7: Zero/pole/gain: p=3-7-9外： 2(s+2)(s+7 k=2; sys=zpk(zp.k) (s+3)(s+7](s+9) School of Mechanical Engineering ME369-Lecture 4.5 Shanghai Jiao Tong University Fall 2015 55 ME369-Lecture 4.5 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University s 2s 5 10 G (s) 1 2    s 1 1 G (s) 2   sys1: sys2: sys3=sys1+sys2 sys=tf(num,den) den num G(s)  Transfer function: 10 ------------- s^2 + 2 s + 5 Transfer function: 1 ----- s + 1 Transfer function: s^2 + 12 s + 15 --------------------- s^3 + 3 s^2 + 7 s + 5 num1=[10]; den1=[1 2 5]; sys1=tf(num1,den1) num2=[1]; den2=[1 1]; sys2=tf(num2,den2) sys3=sys1+sys2 系统传递函数 ME369-Lecture 4.5 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University sys=zpk (z,p,k) 1 2 1 2 ( )( )...( ) ( ) ( )( )...( ) m n s z s z s z G s K s p s p s p        ( 3)( 7)( 9) 2( 2)( 7) ( )       s s s s s G s z=[-2 -7]; p=[-3 -7 -9]; k=2; sys=zpk(z,p,k) Zero/pole/gain: 2 (s+2) (s+7) ----------------- (s+3) (s+7) (s+9) 系统传递函数（续）