磁控形状记忆合金力-磁-热耦合行为及控制策略的分析

《磁控形状记忆合金力-磁-热耦合行为及控制策略的分析》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、AbstractThelnagncticsliapcmemoryalloy(MSMA)isanewfunctionallnatcrialwithlargemagnetic-fieId-inducestrain,greatoutputstrain,highresponsespeedandstrongenergydensity.Inthisdissertation,theexperimentalstudiesofmagneto-mechanical-thermalcouplingpropertiesandcontrolstrategie

2、swithNBMnGaalloyhavebeencarriedout.Tlicinainresearchcontentsarcasfollows:(1)Basedontheexperimentalstudiesofmagneto-mechanica1-1herma1couplingproperties,thecloselynonlinearrelationshipamongpre-stress,controllingmagneticfield,operatingtemperatureanddeformationrateofMSMAw

3、asobtained.ApredictionmodelofthedrivingperformanceofMSMAwasproposedbasedonBPneuralnetwork,andparameterofthepredictionmodelwasoptimizedthroughthegeneticalgorithmTheresultsshowedagoodcorrespondingrelationshipamongpre-stress,controledmagneticfield,operatingtenperatureandd

4、efonnationrateofMSMA・(2)InviewofthetraditionalMSMAactuatorwhichwasusedtheexcitationcoilthatledtorisethetemperatureofMSMAactuator.Inthisthesis,theoptimummeasureswereproposed・ConparedwiththetraditionalmagneticcontrolloopofMSMAactuator,therewerepermanentmagnetandcoolerins

5、tallationstolowerthetemperatureofMSMA.Somesimulationswerecarriedoutuponelectromagneticfieldandtemperaturefield・ThesimulationsindicatedthatthedesigneddrivingmagneticcontrolloopofMSMAactuatorcanmeettherequirements-(3)BasedonthemodelofMSMAactuator,therelationshipbetweenth

6、einputvoltageandtheoutputdisplacementwasobtained.BasedontheinherenthysteresisnonlinearityofMSMAactuator,thehysteresismodelofMSMAactuatorwasbotained.InordertoreducehysteresisnonlinearityofMSMAactuatorandimprovethepositioningaccuary,weusedtwocontrolstrategieswhichwerethe

7、closedloopcontrolandthecompoundcontrol.Thefinalresultsindicatedthatthecontroleffectoftheclosed-loopwasbetterthanthatofcompound.Keywords：MSMA;drivingperformanceofmulti-fieldcoupling;Magneticcontrolloop;Hysteresisnonlinearity;controlstrategies摘要AbstractII第1章绪论11.1研究背景11.

8、2形变机理及构模型2MSMA晶体结构2MSMA形变机理3MSMA本构模型41.3MSMA驱动器研究进展6MSMA驱动器研究现状6MSMA驱动器应用前景81.3.3MSMA驱动器存在的问题91.4木文研究意义与主要内容9141本文研究的