[例2]绘制方块图（续） X(S)= MF)-F)-Fs】 F(S)=K[X(s)-X(S】 F(S)=Bs[X(s)-X,(S】 Fg(s) 1X(s) K X,(s) Bs r.e F(s) Fx(s) Fs(s) M,s- X,(s) F(s) X2(S)= ()+5(-5() 1 F,(s)=K2X2(S) School of Mechanical Engineering ME369-Lecture 4.2 Shanghai Jiao Tong University Fall 2015 例2]绘制方块图（续） F(3) □型 xK F() Fe (s) Fx (s) F,(9 ( Er(s) F(s) X;(s) F(s) Bs F,() F 口g Bs F.( M F:(s) School of Mechanical Engineering ME369-Lecture 4.2 Shanghai Jiao Tong University Fall 2015 44 ME369-Lecture 4.2 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 1 1 2 1 1 ( ) [ ( ) ( ) ( )] X s F s F s F s B K M s    1 2 ( ) [ ( ) ( )] F s Bs X s X s B   1 1 1 2 ( ) [ ( ) ( )] F s K X s X s K   1 2 2 2 2 1 ( ) [ ( ) ( ) ( )] X s F s F s F s B K K M s    2 2 2 ( ) ( ) F s K X s K  [例2]绘制方块图（续） ME369-Lecture 4.2 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University [例2]绘制方块图（续）