基于周期平穩(wěn)性的旋轉(zhuǎn)機(jī)械振動信號分析方法.pdf

1、長沙理工大學(xué)碩士學(xué)位論文基于周期平穩(wěn)性的旋轉(zhuǎn)機(jī)械振動信號分析方法姓名：廖坤鵬申請學(xué)位級別：碩士專業(yè)：載運(yùn)工具運(yùn)用工程指導(dǎo)教師：傅俊慶20070401ABSTRACTWhentherotataryspeedfluctuatesrandomly，thevibrationsignalsofrotatingmachine(suchasautomobileengine，positivespeedgearbox)varywithrandomlyfl

2、uctuatingfrequency，whichhavethepropertyofnon—stationarityTheexistinganalysismethods，suchasFourierTransformandorderanalysis，cannotexpressthepropertyofthesesignalsaccuratelyInordertoanalyzeandprocessthesesignalsaccurately，

3、thispaperhaschieflydonetheresearchinthefollowingaspects：(1)Therotataryspeedofsingle—phaseasynchronousmachineofJZ5622ismeasuredThroughpreliminarystatistics，itisfoundthatthefluctuationdisciplineofthespeedconformstonormaldi

4、stributionundercertaincircumstahoeS(2)Thesimulationsamplingofsignalswithnormalrandomfluctuationisdonebymeansofuniformtimesamplinganduniformanglesampling，theresultsofwhichshowthat：theuniformanglesamplingdifficulttealizeca

5、nbereplacedbyuniformtimesamplingifthesamplingrateishighenough(3)Thecyclostationafypropertyofrandomanglesignalduetoangularspeedfluctuationofrotatingmachineistheoreticallyproved，whichprovidesthetheoreticalbasisfortheconseq

6、uentnewspectrumanalysismethod(4)Onthebasisoforderanalysistheory，rotatingspectrumisputforward，whichisusedtoanalyzetheuniformangleaccelerationsignalsduetotheunbalancemassofthesingle—phaseasynchroⅡousmachineofJZ5622Itachiev

7、esbetterresultsthanothersobtainedbyexistingmethodsTheunbalancemassofthesinglephaseasynchronousmachineofJZ5622iscorrectlypredictedbytherotatingspectrum，whichprimarilyshowsthereliabilityofthismethodTheoryofcyclostationarys

8、ignalsofrotatingmachinevibrationandtherotatingspectrumaimingatthesesignalsenrichtheachievementsofthesignalanalysisandprocessingKeywords：rotatingmachine；vibrationsignals；cyclostatiOⅡaryproperty；uniformanglesampling；rotati