基于BP神经网络的模拟电路故障诊断系统的FPGA设计与实现

《基于BP神经网络的模拟电路故障诊断系统的FPGA设计与实现》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、南京理工大学硕士学位论文基于BP神经网络的模拟电路故障诊断系统的FPGA设计与实现姓名：孙垒申请学位级别：硕士专业：电路与系统指导教师：孙建红20090608Abstract硕士论文Withtherapiddevelopmentoftheelectronicsindustry，theimportanceoftheanalogcircuitfaultdiagnosisismoreandmoreobvious，ithasgreatsignificationforworkingorderlyandreliabledesignofelec

2、tronicequipment．Basingonthecharacteristicsoftheanalogcircuitwitlltolemnce，BPneuralnetworkisselectedforthesystemwhichismuchmoresuitableforfaultdiagnosis．ThissystemisimplementedonaFPGA，sincetheFPGAisparallelprocessingandhighreliability．Manytraditionalanalogcircuitfaultd

3、iagnosismethodsarenotveryefficient。Duetotheimpactofcomponenttolerances，theresultsarefar舶mtheapplicationindiagnosisofcircuits．Thefaulttolerance，associativememoryandgoodnonlinearmappingoftheneuralnetworkmakethismethodmuchbetterthanthetraditionalmethods．BPneuralnetworkin

4、cludestheessentialpartofneuralnetworktheory；ithasmanymeritsforitsapplicationinanalogcircuitfaultdiagnosis．ButthestandardBPalgorithmhasitsowninherentflaws，suchasslowconvergence，easytofallintothelocalminimum．ThispaperfocusesonusinggeneticalgorithmstooptimizetheLevenberg

5、-MarquardtBPalgorithmtoovercometheinherentflawsofstandardBPalgorithm．AndtheapplicationprocessofthisoptimizedalgorithmtOtheanalogcircuitfaultdiagnosissystemisdescribedindetail．Inthefirstpartofthispaper,aprogramisdesignedfortrainingoptimizedalgorithmbyMATLAB．Inthesecond

6、part，aFPGAchipEP2C8Q208C8isselectedaccordingtothefaultdiagnosissystemdesignrequirements，theinterfacecircuitandtheFPGA’Sinternalfunctionalmodulesisdesigned．ThearticleputemphasisonintroducingtheFPGA’Sinternalfunctionalmodules，includingtheADsamplingcontrolmodule，FIFOmodu

7、le，datapre—processingmodule，BPneuralnetworkmoduleandLCDdisplaydrivermoduledesign．Finally,anactualcircuitisselectedtotestthesystem．Theresultsshowthat，comparingwiththeconventionalfaultdictionarymethod，thissystemismuchmoresimple，efficientandaccurate，andhassomedevelopment

8、potentialandpracticalvalue．Keywords：BPNeuralNetwork，AnalogCircuits，FaultDiagnosis，FPGA，GeneticAlgorithmsII声明本学位论文是我在导师的指导下取得