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1、外文翻译SystemDesignanCompensationTechniquesControlsystemsaredesignedtoperformspecifictasks.Therequirementsimposedonthecontrolsystemareusuallyreferredasperformanceimposedonthecontrolsystemareusuallyreferredasperformancespecifications.Theygenerallyrelatetoaccuracy,relat
2、ivestabilityandspeedofresponse.Generally,theperformancespecificationsshouldnotbemorestringentthannecessarytoperformthegiventask.Iftheaccuraryatsteady-stateoperationisofprimeimportanceinagivencontrolsystem,thenweshouldnotrequireunnecessarilyrigidperformancespecifica
3、tionsonthetransientresponsesincesuchspecificationswillrequireexpensivecomponents.Weshouldrememberthatthemostimportantpartofcontrolsystemdesignistostatetheperformancespecificationspreciselysothattheywillyieldanoptimalcontrolsystemforagivenpurpose.Inthislesson,weareg
4、oingtobrieflyintroducethedesignandcompensationprocedureofsingle-input-single-output-(SISO),lineartime-invariant(LTI)controlsystemsbythefrequencyresponseandroot-locusapproaches,Compensationisthemodificationofthemodificationofthesystemdynamicstosatisfythegivenspecifi
5、cations.Settingthegainisthefirststepinadjustingthesystemforsatisfactoryperformance.Inmanycases,increasingthegainvaluewillimprovethesteady-statebehaviorbutwillresultinpoorstabilityoreveninstability,Thenitisnecessarytoredesignthesystem(bymodifyingthestructureorbyinco
6、rporatingadditionaldevicesorcomponents)toaltertheoverallbehaviorsothatthesystemwillbehaveasdesired.Fig.8.1showstheconfigurationwherethecompensatorG(s)isplacedinserieswiththeplant.Thisschemeiscalledseriescompensation.Anotherkindorcompensationisfeedbackcompensation.G
7、enerally,seriescompensationmaybesimplerthanfeedbackcompensation,Indiscussingcompensators,wefrequentlyuseterminologyasleadnetwork,andlag-leadnetwork.Ifasinusoidalinputeiisappliedtotheinputofanetworkandthesteady-stateoutpute0(whichisalsosinusoidal)hasaphaselead,thent
8、henetworkiscalledaleadnetwork.Similarly,ifthesteady-stateoutpute0hasaphaselag,thenthenetworkiscalledalagnetwork.Inalag-leadnetwork,phaselagandpha
