现代的控制理论简介.doc

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1、缬幅嘿稆榱揪岷航框魁英文原文愎筢业裴牲付丸举鹗残IntroductiontoModernControlTheory混惩触疗岚缤峨授畸啾瀛姜菠缎獐偏囱苌莩诚Severalfactorsprovidedthestimulusforthedevelopmentofmoderncontroltheory:滹没氘汐脱寤筠舐德铴a.Thenecessaryofdealingwithmorerealisticmodelsofsystem.镡绫狺兀路筘毖劝渴芦b.Theshiftinemphasistowardsoptimalcontrolandoptimalsystemde

2、sign.戒槟通碍杵党珍蒌瞢狙c.Thecontinuingdevelopmentsindigitalcomputertechnology.饩那好葙相鼬款妲堡葆d.Theshortcomingofpreviousapproaches.唯农猞屋闸龚畋甚汾只e.Recognitionoftheapplicabilityofwell-knownmethodsinotherfieldsofknowledge.癯伞暧卓歃役跫朔溺辨Thetransitionfromsimpleapproximatemodels,whichareeasytoworkwith,tomorer

3、ealisticmodels,producestwoeffects.First,alargenumberofvariablesmustbeincludedinthemodels.Second,amorerealisticmodelismorelikelytocontainnonlinearitiesandtime-varyingparameters.Previouslyignoredaspectsofthesystem,suchasinteractionswithfeedbackthroughtheenvironment,aremorelikelytobein

4、cluded.麽豪将锹黎轰倜壤轫爻Withanadvancingtechnologicalsociety,thereisatrendtowardsmoreambitiousgoals.Thisalsomeansdealingwithcomplexsystemwithalargenumberofinteractingcomponents.Theneedforgreateraccuracyandefficiencyhaschangertheemphasisoncontrolsystemperformance.Theclassicalspecificationsin

5、termsofpercentovershoot,settingtime,bandwidth,etc.haveinmanycasesgivenwaytooptimalcriteriasuchasminimumenergy,minimumcost,andminimumtimeoperation.Optimizationofthesecriteriamakesitevenmoredifficulttoavoiddealingwithunpleasantnonlinearities.Optimalcontroltheoryoftendictatesthatnonlin

6、eartime-varyingcontrollawsareused,evenifthebasicsystemislinearandtime-invariant.埽隋佼匕忭亘妆薯肯抠Thecontinuingadvancesincomputertechnologyhavehadthreeprincipaleffectsonthecontrolsfield.Oneoftheserelatestothegiganticsupercomputers.Thesizeandtheclassoftheproblemsthatcannowbemodeled,analyzed,

7、andcontrolledareconsiderablylargethantheywerewhenthefirsteditionofthisbookwaswritten.渤镭潘图徨喃冬浸泡娉ThesecondimpactofthecomputertechnologyhastosowiththeproliferationandwideavailabilityofthemicrocomputersinhomesandItheworkplace,classicalcontroltheorywasdominatedbygraphicalmethodsbecauseat

8、thetimethatwastheon