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ID:40555492
大小:2.05 MB
页数:38页
时间:2019-08-04
《5 - Distributed Transducers for Active Control of Vibration书》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、5DistributedTransducersforActiveControlofVibration5.1IntroductionAnimportantelementofanypracticalcontrolsystemarethetransducersusedforimplementationofthecontrol.Sensorsareneededformeasurementswhichcanbeusedtoestimateimportantdisturbanceandsystemvariables.Actuatorsareusedtoapplycontrolsig
2、nalstothesysteminordertochangethesystemresponseintherequiredmanner.Ingeneralsensorsprovideinformationtothecontrollertodeterminetheperformanceofthecontrolsystemortoprovidecontrolsignalsrelatedtothesystemresponse.Thussensorsandactuatorsprovidethelinkbetweenthecontrollerandthephysicalsystem
3、tobecontrolledandtheirdesignandimplementationisofprimeimportance.Ingeneral,controltransducerscomeinthreemainforms;pointtransducers,arraysofpointtransducersorcontinuouslydistributedtransducers.Eachparticularformathasitsadvantagesanddisadvantagesandtheseareoutlinedinthischapter.Typesofactu
4、atorsrangefrompointforceactuators,electrostrictiveandpiezoelectricdistributedactuators,tothosebasedonthematerialsofshapememoryalloy(SMA)andmagnetostrictivesystems.Thechoiceofactuatorisdependentuponsystemrequirementssuchasrequiredcontrolauthority(amountofcontrolforce,moment,strainordispla
5、cement,etc.),powerconsumption,frequencyresponse,andphysicalconstraintssuchassizeandmountingrequirements,etc.Sensorsalsorangefromconventionaltransducerssuchasaccelerometers,straingaugesandproximitydetectorstothesystemsbasedonpiezoelectricmaterial,opticalfibresandshapememoryalloyaswellasad
6、vancednon-contactingsensorssuchaslaservibrometers.Choiceoftheparticularsensorconfigurationisdependentuponthesystemvariabletotheobserved,andtosomedegree,theformofsignalprocessingtobeused.Thefollowingsectionsareabriefdiscussionofthebasictheoryandissuesregardingtheimplementationofdistribute
7、dactuatorsandsensorscommonlyencounteredinactivevibrationcontrolsystems.ElectrodynamicshakerscanbereadilymodelledaspointforceinputsandtheresponseofstructurestothesetypesofforcingfunctionshavebeenoutlinedinChapters1and2.Formoreinformationonthesedevicesthereaderisreferredtot
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