发动机曲轴系扭振测量的谐次提取及精度分析-豆柴文库

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发动机曲轴系扭振测量的谐次提取及精度分析
Title:HarmonicExtractionandAccuracyAnalysisinCrankshaftTorsionalVibrationMeasurementofEngine
Abstract:
Crankshafttorsionalvibrationisacrucialfactoraffectingtheperformanceanddurabilityofanengine.Accuratemeasurementandanalysisoftheharmoniccomponentsofcrankshafttorsionalvibrationareessentialfordiagnosingengineirregularitiesandensuringefficientandreliableoperation.Thispaperaimstodiscussthemethodologyofharmonicextractionandprecisionanalysisinmeasuringthetorsionalvibrationoftheenginecrankshaft.
1.Introduction
Thecrankshaftisakeycomponentinanengine,responsibleforconvertingreciprocatingmotionintorotarymotion,propellingthevehicle.However,thecrankshaftissubjectedtotorsionalvibrationsduetotheunbalancedforcesgeneratedduringthecombustionprocess.Thesevibrationscanleadtovariousissuessuchasfatiguefailure,excessivewear,anddegradedoverallengineperformance.Therefore,accuratemeasurementandanalysisofcrankshafttorsionalvibrationareessentialforengineoptimizationandreliabilityimprovement.
2.MeasurementTechniques
Variousmeasurementtechniquescanbeemployedtocapturethetorsionalvibrationsofthecrankshaft.Theseincludeopticalencoders,proximityprobes,straingauges,accelerometers,andtorquesensors.Eachtechniquehasitsadvantagesandlimitationsconcerningaccuracy,easeofimplementation,andcost.Theselectionofanappropriatemeasurementtechniquedependsonthespecificrequirementsandconstraintsoftheengineunderinvestigation.
3.HarmonicExtractionMethodology
Harmonicextractioninvolvesseparatingthetorsionalvibrationsignalsintotheirconstituentharmoniccomponents.Thisprocessiscrucialforidentifyingthedominantharmonicfrequenciesandtheiramplitudes,enablingamoredetailedanalysisofthecrankshaftbehavior.Severalmethodscanbeemployedtoextractharmoniccomponents,includingFouriertransform,wavelettransform,andcepstrumanalysis.Eachmethodhasitsstrengthsandweaknesses,andthechoicedependsonthespecificcharacteristicsofthetorsionalvibrationsignal.
4.PrecisionAnalysis
Theaccuracyofharmonicextractionhighlydependsonthequalityo