2020 Automatic Control Theory(Beijing Jiaotong University) 最新满分章节测试答案

文章目录[隐藏]

Chapter 1. Mathematical Model of Control System Chapter 1 test. Mathematical Model of Control System
【作业】Chapter 1. Mathematical Model of Control System Chapter 1 homework
Chapter 2. Transient and Steady-State Response Analyses Chapter 2 test. Transient and Steady-State R
Chapter 3. Control Systems Analysis by the Root-Locus Method Chapter 3 test. Root-Locus
Chapter 4. Control System Analysis and Design by the Frequency-Response Method Chapter 4 test.Analys

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本课程起止时间为:2020-09-14到2020-12-31

Chapter 1. Mathematical Model of Control System Chapter 1 test. Mathematical Model of Control System

1、问题:If the feed-forward transfer function of a system is G(s)，feedback block is H(s)，the system open-looptransfer function is
选项：
A:G(s)H(s)
B:G(s)
C:G(s)/(1+G(s)H(s))
D:G(s)/H(s)
答案: 【G(s)H(s)】

2、问题:If the closed-loop transfer function of the unity-feedback control system is , then the open-loop transfer function of the system is
选项：
A:
B:
C:
D:
答案: 【】

3、问题:Which one is correct about system transfer function?
选项：
A:Independent of the input signal and related to the system structure and parameters.
B:It is related to input signal and system structure and parameters.
C:Related to input signal, independent of system structure and parameters.
D:It has nothing to do with system structure and is related to system parameters.
答案: 【Independent of the input signal and related to the system structure and parameters.】

4、问题:Transfer function is suitable for ( ) system.
选项：
A:Linear time-invariant system with single input and single output
B:Linear time-varying system with single input and single output
C:multiple input and multiple output
D:nonlinear system
答案: 【Linear time-invariant system with single input and single output】

5、问题:For a LTI system, the unit-impulse response can be obtained by differentiating the corresponding response.
选项：
A:unit-step
B:unit-ramp
C:unit-parabolic
D:sinusoidal
答案: 【unit-step】

6、问题:Obtain the transfer function of U0(s)/Ui(s)
选项：
A:
B:
C:
D:
答案: 【】

7、问题:System dynamic structure block is shown as below，R(s)is input signal，N(s)is disturbance signal，obtain the transfer function of C(s)/R(s)
选项：
A:(G1G2+G1G3(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)
B:(G1G2+G1G3(1+G2H))/(1+G2H+G1G2+G1G3)
C:(G1G2)/(1+G2H+G1G2+G1G3+G1G2G3H)
D:(G1G2+G1G3)/(1+G2H+G1G2+G1G3+G1G2G3H)
答案: 【(G1G2+G1G3(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)】

8、问题:System dynamic structure block is shown as below，R(s)is input signal，N(s)is disturbance signal，obtain the transfer function of C(s)/N (s)
选项：
A:(-1-G2H+G1G2G4+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)
B:(G1G2G4+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3)
C:(G1+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3)
D:(-1+G2H+G1G2+G1G3G4G2H)/(1+G2H+G1G2+G1G3)
答案: 【(-1-G2H+G1G2G4+G1G3G4(1+G2H))/(1+G2H+G1G2+G1G3+G1G2G3H)】

9、问题:Closed-loop control system is an automatic control system. Open-loop control system is not an automatic control system.
选项：
A:正确
B:错误
答案: 【错误】

10、问题:The system is a system. (linear/nonlinear)
答案: 【linear】

【作业】Chapter 1. Mathematical Model of Control System Chapter 1 homework

1、问题:Simplifying the structural diagram to obtain transfer functionn
评分规则: 【
】

Chapter 2. Transient and Steady-State Response Analyses Chapter 2 test. Transient and Steady-State R

1、问题:The closed-loop transfer function of a second-order system is The step response of the system will
选项：
A:be a damped oscillation
B: oscillate to infinity
C:increase monotonically
D:decrease monotonically
答案: 【increase monotonically】

2、问题:After the negative feedback connection is adopted, the
选项：
A:closed-loop system must be stable.
B:dynamic performance of the system will be improved.
C:steady-state error finally be eliminated completely.
D: structural parameters of the system need to be adjusted in order to improve the performance of the system.
答案: 【 structural parameters of the system need to be adjusted in order to improve the performance of the system.】

3、问题:The transfer function of a closed-loop system is G(s)=1/(s(s+1)) ，then the unit impulse response of the system is
选项：
A:
B:
C:
D:
答案: 【】

4、问题:If the steady-state error of unity feedback control system to a ramp input is constant, then the system is a type system
选项：
A:0
B:I
C:II
D:III
答案: 【I】

5、问题:System dynamic structure block is shown in figure, （1） Determine the range of K for system stability.
选项：
A:0<K<15
B:0<K<8
C:-1<K<10
D:2<K<11
答案: 【0<K<15】

6、问题:(2)Determine the range of K for the root of the system all on the left side of s=-1 in the s plane.
选项：
A:0.72<K<6.24
B:0.5<K<3.63
C:-0.28<K<1.93
D:0<K<9
答案: 【0.72<K<6.24】

7、问题:(3)Determine the range of K for the steady-state error ess<=0.25 at input r(t)=2t+2.
选项：
A:8<K<15
B:-2<K<3
C:5<K<16
D:0<K<3
答案: 【8<K<15】

8、问题: Given the transfer function G(s) of a system (3s+7)/(s(s+1)) A unit step u(t) is applied to the system’s input, then the time response y(t) is ( ).
选项：
A:y(t)= u(t) · (4+7t+4 e-t)
B:y(t)= u(t) · (2 + 7t + 7e-t)
C:y(t)= u(t) · (7 +4t + 4e-t)
D:y(t)= u(t) · (4 – 2t + e-t)
答案: 【y(t)= u(t) · (4+7t+4 e-t)】

9、问题:The control system is shown in Figure a. When Gc(s)=0，(1)determine the , the damping ratio of the closed-loop system .
选项：
A:0.316
B:0.707
C:1
D:0.5
答案: 【0.316】