基于支持向量機(jī)的模擬電路故障診斷方法研究.pdf

1、南京理工大學(xué)碩士學(xué)位論文基于支持向量機(jī)的模擬電路故障診斷方法研究姓名：李愛(ài)琴申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電子與通信工程指導(dǎo)教師：張重雄；孫宏國(guó)201109工程碩士學(xué)位論文AbstractTheresearchonmethodofanalogcircuitfaultdiagnosis，notonlyisofgreatsignificanceincircuittheory，butalsoithasaveryimportantvalueinele

2、ctronicdevices，integratedcircuitsandotherpracticalapplicationsandSOonTherearemanytraditionalanalogcircuitfaultdiagnosis’Smethods，andthediagnosisofthesemethodsdependslargelyonthesuccessoftheoptimizationofanalogcircuitfaul

3、tdiagnosismodel，andjustonceestablishedthemodelisdifficulttochange，anditgivesrisetothelackofappropriateflexibility，andtilltheendtheremaybeunabletogetequationofanalogcircuitfaultdiagnosiswhichcannoteffectivelydiagnosethemS

4、omoreandmorepeoplebegantograduallytrytoapplytheartificialintelligencetechniquesinanalogcircuitfaultdiagnosis，butthetraditionalartificialneuralnetworkhasinputsamplewithhigherdemandsinself—learning，localoptima，under—learni

5、ng，over—learningandandmodelstructurewhichisdifficulttodetermineandSOon，whiletheanalogcircuitfaultdiagnosismethodbasedonSupportVectorMachine(SⅧ)cansolvetheseproblemsInthispaper，itinvestigatesthegeneralmethodsandprocedures

6、forfaultdiagnosisofanalogcircuitsbasedonsupportvectormachine，andanalyzesthedifficultandcriticaltechnologiesinsomeofthefaultfeatureextractionandthebuiIdingofsupportvectormachine：Itdescribesthebasictheoryofanalogcircuitfau

7、ltdiagnosisandsupportvectormachines：Itstudiesanalogcircuitfaultfeatureextractionmethods：finally，atypicallowpassfiltercircuitisselectedtotestthesemethodsandprocessbyusingPspiceandMatlabsoftwareThesimulationresultsshowthat

8、supportvectormachinescanmoreaccuratelyclassifyandidentifythesinglesoftfaultsinanalogcircuits，whilethepropertiesofanalogcircuitfaultdiagnosisbasedonSupportVectorMachine(SVM)arebetterthanthesebasedonBPneuralnetworkindiagno

9、sisaccuracyandtimeoftraining—testing：Theresultsalsoshowthat，thetwomethodsoffaultfeatureextractionbasedoneffectivesamplingpointandwaveletpacketarebothpractical，thepropertiesofanalogcircuitfaultdiagnosisbasedonwaveletpacke