齿轮与滚动轴承故障的振动分析与诊断

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1、西北工业大学博士学位论文齿轮与滚动轴承故障的振动分析与诊断姓名：孟涛申请学位级别：博士专业：航空宇航推进理论与工程指导教师：廖明夫20030901AbstractDetectionoffaultsingearsandrollingelementbearingshasbeenpaidmuchattentionanddeservesfurtherinvestigationbecauseofthediversityofthetypesandworkconditionsofthesemechanicalparts．Vibra

2、tionanalysisiswidelyusedintheconditionmonitoringandfaultdetectionofthegearsandrolIingelementbearings．Manyresearchesonthistopichavebeenmade[20—601，butmuchstillremainstobedone．Forexample，oneoftheproblemsistosuppressnoiseinthevibrationsignalsmeasuredonagearboxoron

3、abearingpedestal．ItisparticularlyimpoaantindemodulatingthevibrationsignalsItiswellknownthatthemodulationofvibrationsignalsisadecisivesignatureofthepresentofalocalfaultineithergearsorbearings．Thedemodulationofthesesignalswillmoreclearlyrevealthesignatures，Howeve

4、rtheresultofdemodulationisoftenmaskedbynoisecontaininginthemeasuredsignals，Vibrationsignalprocessingtechniquesaresoughtinthisdissertation．Sothetestfigsofthegearandtherollingelementbearingarebuilt．Anddifferenttypesofthefaultsaresimulatedindividuallyinthegearandt

5、herollingelementbearing．Inthispaper,severalconventionalmethodsforprocessingthevibrationsignalsareverifiedfordetectingfaultsingearsandballbearingswithtwotestrigsdesignedespeciallyforthisinvestigation．Theresultsoftheexperimentshowthatthepeakvalue，RMS，standarddevi

6、ation，crestfactor,kurtosisvalueandimpulsevalueofthevibrationsignalsCalldistinguishbetweenthenormalandabnormalconditionsoftheballbearingwhenthelevelofnoiseislow．However,whyandhowthefaultshappeninthemachinescannotberevealed．Thentheresonancedemodulationtechniqueis

7、usedinanalyzingthevibrationsignalofthegearandballbearing．Tosomeextenttheresultsdependontheselectedfrequencyband．Inordertoeffectivelyextractthedefectsignatureofthevibrationsignal，twonewmethods，singlegeartoothanalysis(periodsegmentationtechnique)andtime．delayedco

8、rrelationdemodulation，areestablishedandexperimentallytested．Themainideaofthesinglegeartoothanalysis，isthatthevibrationsignalscollectedwithhighsamplingratearedividedintoanumb