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国家开放大学【机电控制工程基础】纸考期末复习真题资料

  • 2026-02-01 05:51:34
国家开放大学【机电控制工程基础】纸考期末复习真题资料
国家开放大学  机电控制工程基础             纸考期末复习资料

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试卷代号:1116

国家开放大学春季学期期末统一考试

机电控制工程基础试题

一、单项选择题(每小题4分,共32分)

1.系统的稳定性取决于( )

A.系统干扰的类型    B.系统干扰点的位置

C.系统闭环极点的分布    D.系统的输入

2.已知线性系统的输入x(t),输出y(t),传递函数G(s),则正确的关系是( )

AB

CD

3. PI校正为( )校正。

A.滞后   B.超前

C.滞后超前    D.超前滞

4.系统的传递函数其系统的增益和型次为(    )

A52    B5/42

C54    D5/44

5.某系统的传递函数是,则该系统可看成由(  )环节串联而成。

A.比例、延时    B.惯性、超前

C.惯性、延时    D.惯性、比例

6.函数的拉氏变换为(    )

A. B

CD

7.单位负反馈结构的系统,其开环传递函数为,根轨迹分支数为(    )

A1    B2

C3    D4

8.惯性环节的对数幅频特性的高频淅近线斜率为(    )

AB

CD

二、判断题(每小题3分,共30分)

9.将被控量的全部或部分反馈回系统的输入端,参与系统的控制,这种控制方式称为反馈控制或闭环控制。(  )

10.单位阶跃函数的拉普拉斯变换结果是1(    )

11.两个二阶系统具有相同的超调量,这两个系统也会具有不同的阻尼比。(    )

12.一阶系统的时间常数越小,系统的响应速度越快。(    )

13.叠加性和齐次性是鉴别系统是否为线性系统的根据。(    )

14.劳斯稳定判据能判断线性定常系统的稳定性。(    )

15.系统的传递函数为则该系统零点为1,极点为0-2(    )

16.在经典控制理论中常用的控制系统数学模型有微分方程、传递函数、频率特性等。    (    )

17.频率响应是线性系统在正弦输入下的稳态响应。(    )

18.控制系统的三个基本要求是稳定、准确及快速。(    )

三、综合题(38分)

19.(15分)设单位负反馈系统的开环传递函数为,求

(1)系统的阻尼比和无阻尼自然频率。;

(2)系统在单位阶跃函数输入下的超调量及调整时间(取5%的误差带)。

20.(10分)系统的特征方程为

试用劳斯判据判断系统的稳定性。

21(13)已知单位负反馈系统的开环传递函数如下

求:(1)试确定系统的型别和开环增益;

(2)试求输入为时,系统的稳态误差。

试卷代号:1116

国家开放大学春季学期期末统一考试

机电控制工程基础试题答案及评分标准

(供参考)

一、单项选择题(每小题4分,共32分)

1C    2B    3A    4B    5C

6A    7B    8D

二、判断题(每小题3分,共30分)

9.√    10.×    11.×    12.√    13.

14.√    15.√    16.√    17.√    18.

三、综合题(38分)

19.(15分)设单位负反馈系统的开环传递函数为,求

(1)系统的阻尼比和无阻尼自然频率

(2)系统在单位阶跃函数输入下的超调量及调整时间(取5%的误差带)。

解:(1)系统闭环传递函数为

5分)

与标准形式对比,可知

5分)

(2)

5分)

20.10分)系统的特征方程为

试用劳斯判据判断系统的稳定性。

解:计算劳斯表中各元素的数值,并排列成下表

1  4

2    3  5

3  0

950                 5分)

32

5

由上表可以看出,第一列各数值的符号改变了两次,由变成,又由改变成

因此该系统有两个正实部的根,系统是不稳定的。5分)

21.(13分)已知单位负反馈系统的开环传递函数如下

求:(1)试确定系统的型别和开环增益;

(2)试求输入为时,系统的稳态误差。

解:(1)该传递函数已经为标准形式,可见,系统型别为0,这是一个0型系统。

开环增益6分)

(2)讨论输入信号,2分)

稳态误差5分)

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  1. CONNECT:[ UseTime:0.000614s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000850s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000322s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000244s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000510s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000498s ]
  8. SELECT * FROM `article` WHERE `id` = 458844 LIMIT 1 [ RunTime:0.007069s ]
  9. UPDATE `article` SET `lasttime` = 1770867576 WHERE `id` = 458844 [ RunTime:0.027068s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001811s ]
  11. SELECT * FROM `article` WHERE `id` < 458844 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000515s ]
  12. SELECT * FROM `article` WHERE `id` > 458844 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000779s ]
  13. SELECT * FROM `article` WHERE `id` < 458844 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001306s ]
  14. SELECT * FROM `article` WHERE `id` < 458844 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001174s ]
  15. SELECT * FROM `article` WHERE `id` < 458844 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004241s ]
0.116621s