workgraduallyexpandingthescopeoftheinspection.(3)checkdailycheck,annualinspectionandspecialinspection.1)dailycheckshouldpreparerecords,foundthattheproblemshouldbereportedtothesupervisorinatimelymannerand,ifnecessary,shouldbeaccompaniedbyaphotoorsketch.2)touroftheyear...Summaryreport,includingthefindingsandthemeasurestobetaken.3)ifexceptionalcircumstances,suchaslong-termsustainabilityofgroundwaterlevelhigh,strongearthquakes,largeblastingorblastingoutofcontrol,thebodychangesinthedeformationofsurroundingrockandabnormalsituations,suchasabuilding,specialinspectionshouldbecarriedout.Theemployerdoesnotpayfees.(4)monitorplantedphaseatthesametime,respondtothesiteforinspection.(5)keepallwithoutanyalterationoftheoriginalrecord,thesupervisorhastherighttoatanytime.Ifthesupervisormonitordataerrorreported,incomplete,false,defect,ordelay,righttodeductiontopaythecosts.(6)monitoringduringthecontractperiod,scheduleofmonitoringdataandtheoriginaldatasubmittedtothesupervisor.10.7contractmonitoringdatacollectionandpreliminaryanalysisof二000年下半年高等教育自学考试全国统一命题考试自动控制理论试题(电力系统及其自动化专业·本科)本试题分两部分,第一部分为选择题,1页至2页,第二部分为非选择题,2页至8页,共8页,共8页;选择题20分,非选择题80分,满分100分。考试时间150分钟。第一部分选择题一、单项选择题(本大题共15小题,前10小题每题1分,后5小题每题2分,共20分)在每小题列出的四个选项中有一个选项是符合题目要求的,请将正确选项前的字母填在题后的括号内。1.实际生产过程的控制系统大部分是【】A.一阶系统B.二阶系统C.低阶系统D.高阶系统2.若开环传递函数G(s)H(s)不存在复数极点和零点,则【】A.没有出射角和入射角B.有出射角和入射角C.有出射角无入射角落D.无出射角有入射角3.若开环传递函数为1)(TssKsG,此时相位裕量和K的关系是【】A.随K增加而增大B.随K增大而减小C.以上都不是D.与K值无关4.超前校正装置的最大超前相角【】A.11sin1B.11sin1C.11cos1D.11cos15.对于同一系统的状态变量和状态空间描述具有【】A.状态变量具有唯一性,状态空间描述具有非唯一性B.状态变量具有非唯一性,状态空间描述具有唯一性C.状态变量具有非唯一性,状态空间描述也具有非唯一性D.状态变量具有唯一性,状态空间描述也具有唯一性6.在工程问题中,常用______数学模型来表达实际的系统。【】workgraduallyexpandingthescopeoftheinspection.(3)checkdailycheck,annualinspectionandspecialinspection.1)dailycheckshouldpreparerecords,foundthattheproblemshouldbereportedtothesupervisorinatimelymannerand,ifnecessary,shouldbeaccompaniedbyaphotoorsketch.2)touroftheyear...Summaryreport,includingthefindingsandthemeasurestobetaken.3)ifexceptionalcircumstances,suchaslong-termsustainabilityofgroundwaterlevelhigh,strongearthquakes,largeblastingorblastingoutofcontrol,thebodychangesinthedeformationofsurroundingrockandabnormalsituations,suchasabuilding,specialinspectionshouldbecarriedout.Theemployerdoesnotpayfees.(4)monitorplantedphaseatthesametime,respondtothesiteforinspection.(5)keepallwithoutanyalterationoftheoriginalrecord,thesupervisorhastherighttoatanytime.Ifthesupervisormonitordataerrorreported,incomplete,false,defect,ordelay,righttodeductiontopaythecosts.(6)monitoringduringthecontractperiod,scheduleofmonitoringdataandtheoriginaldatasubmittedtothesupervisor.10.7contractmonitoringdatacollectionandpreliminaryanalysisofA.精确的B.复杂的C.简化的D.类似的7.正弦输入函数r(t)的数学表达式是【】A.ttrsin)(rB.)sin()(ttrC.)sin()(tAtrD.)cos()(tAtr8.二阶振荡环节的对数幅频特性的高频段的渐近线斜率为_______dB/dec。【】A.40B.-20C.-40D.09.欲改善系统动性能,一般采用【】A.增加附加零点B.增加附加极点B.同时增加附加零点,极点D.A,B,C均不行而用其它方法10.在各种校正方式中,______是最常见的一种,常加在系统中能量最小的地方。【】A.并联校正B.串联校正C.局部反馈校正D.前馈校正11.设系统的开环传递函数为,)5)(1(SSSK要使系统稳定,K值的取值范围为【】A.K0B.K40C.0K40D.0K3012.一阶系统1)(TsKsGG(s)的单位脉冲响应是y(t)=_______。【】A.)1(/TteKB.TtTeTt/C.TteTK/D.Ke-t/T13.设开环系统的频率特性为G(jω)=2)1(1)(jjG,则其频率特性的极坐标图的奈氏曲线与负虚轴交点的频率值ω_____rad/s。【】A.0.1B.1C.10D.214.负载效应_______。A.不仅存在于电气环节,在其它类型的环节上也可能存在B.不存在于电气环节,只存在于其它类型的环节C.只存在于电气环节,不存在于其它类型的环节D.任何环节都不存在15.若系统bXX1a012具有状态可控性,则常系数a,b的关系应满足。【】A.a-b≠0B.2b2-b-a≠0C.a-b=0D.2b2-b-a=0workgraduallyexpandingthescopeoftheinspection.(3)checkdailycheck,annualinspectionandspecialinspection.1)dailycheckshouldpreparerecords,foundthattheproblemshouldbereportedtothesupervisorinatimelymannerand,ifnecessary,shouldbeaccompaniedbyaphotoorsketch.2)touroftheyear...Summaryreport,includingthefindingsandthemeasurestobetaken.3)ifexceptionalcircumstances,suchaslong-termsustainabilityofgroundwaterlevelhigh,strongearthquakes,largeblastingorblastingoutofcontrol,thebodychangesinthedeformationofsurroundingrockandabnormalsituations,suchasabuilding,specialinspectionshouldbecarriedout.Theemployerdoesnotpayfees.(4)monitorplantedphaseatthesametime,respondtothesiteforinspection.(5)keepallwithoutanyalterationoftheoriginalrecord,thesupervisorhastherighttoatanytime.Ifthesupervisormonitordataerrorreported,incomplete,false,defect,ordelay,righttodeductiontopaythecosts.(6)monitoringduringthecontractperiod,scheduleofmonitoringdataandtheoriginaldatasubmittedtothesupervisor.10.7contractmonitoringdatacollectionandpreliminaryanalysisof第二部分非选择题一、填空题(本大题共10小题,每小题1分,共10分)16.控制系统的稳态误差一般要求在被控量稳定值的______以内。17.在励磁控制系统中,_________是被控对象。18.采用拉氏变换,可将系统的________方程转换成________方程求解。19.控制系统的分析和综合方法有________,时域法,根轨迹法,状态空间法等。20.当K>0时,0型系统的奈氏图始于________的有限值处。21.比例环节的对数幅频特性L(ω)=。22.闭环频率特性的性能指标有_____,_____和频带宽度ωb。23.如果根轨迹位于实轴上两个相邻的开环零点之间,那么这两个零点之间必定存在__________。24.超前校正装置的奈氏曲线为一个____________。25.在给定时刻t,状态向量X(t)在状态空间中是_________。三、名词解释题(本大题共5小题,每小题2分,共10分)26.连续控制系统27.特征方程式28.二阶系统(附微分方程式或传递函数描述)29.频率特性30.渐近稳定性四、简答题(本大题共6小题,每小题4分,共24分)31.对自动控制系统的性能要求是什么?32.某环节的动态方程为)()(txtyy,试写出该环节的传递函数,并画出其阶跃响应曲线。33.控制系统的典型输入信号有哪几种?试写出其