[例1]由微分方程组绘制信号流图 u,(t)-4(t) =i,(t) U,s)-U=1,s) R R 40=2e0-60咖 LT U=4)-46 Cs 4,0-.@=i,0 Us)-U@=1,s) R R U)= 2(s) C2s School of Mechanical Engineering ME369-Lecture 4.3 Shanghai Jiao Tong University Fall 2015 [例1]绘制信号流图（续） U.(6)-U,()-1(6s) R Us-U@=1,) R -1 1/R U.(s) 1(s) U,(s) I(8) U.() -1 1 U,)=49-s U.=1,o Cs C.s School of Mechanical Engineering ME369-Lecture 4.3 Shanghai Jiao Tong University Fall 2015 33 ME369-Lecture 4.3 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 1 1 1 ( ) ( ) ( ) r u t u t i t R   1 1 2 1 1 u t i t i t t ( ) [ ( ) ( )]d C    1 2 2 ( ) ( ) ( ) c u t u t i t R   2 2 1 ( ) ( )d c u t i t t C   1 1 1 ( ) ( ) ( ) U s U s r I s R   1 2 1 1 ( ) ( ) ( ) I s I s U s C s   1 2 2 ( ) ( ) ( ) U s U s c I s R   2 2 1 ( ) ( ) U s I s c C s  LT [例1]由微分方程组绘制信号流图 ME369-Lecture 4.3 Fall 2015 School of Mechanical Engineering Shanghai Jiao Tong University 1 1 1 ( ) ( ) ( ) U s U s r I s R   1 2 2 ( ) ( ) ( ) U s U s c I s R   2 2 1 ( ) ( ) U s I s c C s 1 2  1 1 ( ) ( ) ( ) I s I s U s C s   [例1]绘制信号流图（续）