传递函数定义（续） d"x (t) d.() dtn +a1 d-x() d- +…+am- dt +a x(t) =x@+h4 dtm 0+ dt 2+bmx,(0 ZIC du dr (aos"+as"+..+as +a)Xe(s) =(bos"+bs"+.+ms +bm),(s) G(s)= Xe(s)bos"+bs"++omis +bm X,(s)）as”+as-+.+an-1s+an School of Mechanical Engineering ME369-Lecture 4.1 Shanghai Jiao Tong University Fall 2015 传递函数定义（续） G(s)= Xe(s)bos"+bs"++mis +bm X(s)dos"+as"+..+as +an G0)=6=K a 系统的放大系数(amplification coefficient)或增益(gain) School of Mechanical Engineering ME369-Lecture 4.1 Shanghai Jiao Tong University Fall 2015 22 ME369-Lecture 4.1 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University n n n n m m m m r c a s a s a s a b s b s b s b X s X s G s               1 1 0 1 1 1 0 1 ... ... ( ) ( ) ( ) 1 0 1 1 1 0 1 1 ( ... ) ( ) ( ... ) ( ) n n n n c m m m m r a s a s a s a X s b s b s b s b X s              ( ) ( ) ... ( ) ( ) ( ) ( ) ... ( ) ( ) 1 1 1 0 1 1 1 1 0 1 b x t dt d x t b dt d x t b dt d x t b a x t dt dx t a dt d x t a dt d x t a m r r m m r m m r m n c c n n c n n c n                L[] ( )i i d dt i ZIC s 传递函数定义（续） ME369-Lecture 4.1 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University n n n n m m m m r c a s a s a s a b s b s b s b X s X s G s               1 1 0 1 1 1 0 1 ... ... ( ) ( ) ( ) (0) m n b G a   K 系统的放大系数（amplification coefficient）或增益（gain） 传递函数定义（续）