《自动控制原理》A卷王学军

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1、一、化简题(每小题10分，共20分)1.试用结构图等效化简或梅逊公式求图1所示系统的传递函数。图12.用结构图等效变换或梅逊公式求图2所示系统的传递函数。图2考生答题不得过此线··················密······························封························线···························院系专业　　　　年级班级　姓名学号··················装······························订······

2、··················线···························第3页共4页二、分析计算题(第一小题12分，第二小题18分，共30分)1.设图3（a）所示系统的单位阶跃响应如图3（b）所示。试确定系统参数和。图3（a）系统结构图图3（b）系统的单位阶跃响应图2.系统结构图如图4所示。图4求：（1）.为确保系统稳定，确定的取值范围。（2）.为使系统特征根全部位于平面的左侧，应取何值？（3）.若时，要求系统稳态误差，应取何值？考生答题不得过此线··················密········

3、······················封························线···························院系专业　　　　年级班级　姓名学号··················装······························订························线···························第3页共4页三、分析计算题(20分)已知系统的开环传递函数为1.绘制系统的根轨迹图。2.为使系统的阶跃响应呈现衰减振荡形式，试确定的取值范

4、围。四、综合分析计算题(15分)某最小相位系统的开环对数幅频特性如图5所示。要求1.写出系统开环传递函数；2.利用相角裕度判断系统的稳定性；3.将其对数幅频特性向右平移十倍频程，试讨论对系统性能的影响。图5考生答题不得过此线··················密······························封························线···························院系专业　　　　年级班级　姓名学号··················装·············

5、·················订························线···························第3页共4页五、综合分析题（15分）单位负反馈系统的开环传递函数为采用超前校正，使校正后系统速度误差系数/s，相角裕度≥45º。求解校正装置的传递函数。考生答题不得过此线··················密······························封························线···························院系专业　　

6、　　年级班级　姓名学号··················装······························订························线···························第3页共4页