内燃机故障诊断数据采集与处理系统开发

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1、西南交通大学硕士学位论文内燃机故障诊断数据采集与处理系统开发姓名：匡剑申请学位级别：硕士专业：车辆工程指导教师：秦萍20080301西南交通大学硕士研究生学位论文第1I页AbstractTheinternalcombustionenginesasthetravellingorstationarydeviceshadthegreateffectonindustryproductionandhumansociety．Becauseitworkedinthefouloperatingconditions，thep

2、ossibilityofbreakdownwasveryhigh．Ift11efaultdeveloped．itwouldgiveaseriousimpactonthewholemechanicalsystemandbringthehugedamagedirectlyandindirectly．SoitWasveryimportanttoensuretheI．C．enginesinagoodoperationcondition．Becauseofitscomplicatedconfiguration,hi曲

3、impactiveinterferenceandnon-stationaryoperationcharacteristic，I．C．end"．neswereoneofthemostdifficultdiagnosisdevices．Alsobecausethesignal—noiseseparation，dataprocessingandtheadaptabilityofdiagnosiscriterionhadcriticalrequirement．thesignalofI．C．enginesshould

4、beprocessedbyspecialsoftware．Basedonpreviousresearch，thisthesisdevelopedadataacquisitionandprocessingsystemwhichsuitedfornon-stationarysignalandhadthetime．frequencyjointanalysisfunction．ThesignalgeneratedbyI．C．engineswastypicalnon-stationarysignal．Thesyste

5、mthatdevelopedfornon．stationarysignalincludedtwoparts．signalacquisitionandprocessingsystem．ThesignalacquisitionsysteminvolvedtwokindsofA／Dconverter．typeUSB2080andtypeUDAQ20612．ThesetwokindsofA／Dconverterwerepurchasedfromthemarket．TheacquisitionprogrammeofU

6、SB2080Wasprogrammedbyauthor,theacquisitionprogrammeofUDAQ20612Wasprovidedbysupplier．ConsideringthedataformatofUDAQ20612．thedatatransfoFinprogrammeWasprogrammedbyauthorandhadbeenintegratedintowholesystem．Thesignalprocessingsystemhadmanyfunctions，suchasFFTan

7、alysisfunction，PSDanalysisfunctionandfilteringfunction．Fornon-stationarysignal，theST】盯analysisfunction，C、WandDWTanalysisfunctioncouldbeutilizedtoanalyze．ThesystemWascompiledinBorlandC++Builder,Matlabandachieyedthedesigningprincipleandmethodofhuman-computer

8、interface．TheinterfacedesignedforsystemWaspowerful．beautifulanduse．friendly．Forvalidatingthesignalprocessingsystem，theA．E．dataofplainbearinginS195·2dieselcombustionenginethatfromprofessorQinpingofSouthwestJia