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2-2 试建立习题 2-2 图所示系统的微分方程。

2-2 试建立习题 2-2 图所示系统的微分方程。. k 1. x. A. f. x 1. B. k 2. y. ( b ). 2-2(b). R 1. i 1. i. i 2. C. u r. R 2. u c. 2-2(c) 求微分方程 ( 及传递函数 ) 。. C. i 1. i 2. R. R. u c. u r. i c. C. ( d ). 2-2 ( d ). 解:.

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2-2 试建立习题 2-2 图所示系统的微分方程。

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  1. 2-2 试建立习题2-2图所示系统的微分方程。 k1 x A f x1 B k2 y (b) 2-2(b)

  2. R1 i1 i i2 C ur R2 uc 2-2(c)求微分方程(及传递函数)。

  3. C i1 i2 R R uc ur ic C (d) 2-2(d) 解:

  4. 若某系统的单位阶跃响应为c(t)=1-2e-2t+e-t, 试求, 传递函数和脉冲响应。 2-4 解: 或

  5. R1 i1 i i2 C ur R2 uc 2-5建立结构图。

  6. G5 X2(s) R(s) G1 X1(s) G2 X3(s) C(s) - G3 G4 - - G6 G7 - G8 2-6已知一系统由如下方程组组成,试绘制系统框图,求出闭环传递函数。 解: 系统框图如下: - -

  7. C (s) R (s) G2H (a) - G1 G2 2-7试用结构图等效化简习题2-7图所示各系统的传递函数。 结构图化简如下: 解: 系统传递函数如下:

  8. R(s) C(s) - - - R(s) C(s) - - - (b) 2-7b

  9. C (s) R (s) G4 G1 G1 G2 G2 G3 G3 (c) - - - H2 G4 /G2 H1 C (s) R (s) - - - H2 H1 2-7(c) 结构图化简如下: 解:

  10. C (s) R (s) G1 G2 G3 +G4 /G2 - - - H2 H1 / (G3 + G4 /G2) 系统传递函数如下:

  11. 已知控制系统结构图如题2-8图所示,求输入 时系统的输出c(t). 2-8

  12. R(s) C(s) - 2-9 -

  13. 2-11a (结果同2-7)

  14. 2-11b (b)

  15. 2-11c (c)

  16. R C G3 R C H1 G4 H1+G3H2 G4 (b) (-) R C G1 G2 G3 (c) H1 G4 (a) 2-12求系统2-12所示结构图的传递函数。 解: 方法一:结构图化简。

  17. 方法二:梅逊公式。 三个独立回路: 回路相互接触,则: 两条前向通路

  18. - (a) 2-13已知系统的结构图如系统2-13图所示,图中R (s)为输入信号,N (s)为干扰信号,试求传递函数C (s)/R (s), C (s)/N (s)。 2-13(a) 解: (1)当N (s)=0,求C (s)/R(s)

  19. - (a) (2)当R (s) = 0,求C (s)/ N (s)。 用梅逊公式。 三个独立回路: 有一对互不接触的回路: 则: 三条前向通路:

  20. 2-14 系统的信号流图如习题2-14图所示,试求C (s)/R (s) 2-14(a)解:用梅逊公式。 三个独立回路: 回路相互接触, 一条前向通路,

  21. 2-14(b)解:用梅逊公式。 四个独立回路: 有一对互不接触的回路 则: 三条前向通路

  22. 2-15 题2-15图

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