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时间:2019-06-16
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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
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