基于广义S变换的汽车零部件载荷谱编辑方法

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中图分类号：U467 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202404024

Abstract：ExistingS-transform-basedloadspectrumeditingmethodsforautomotivecomponentssufferfromtheproblemoflackof adaptivityin time-frequencyresolution，whichafectsthetime-frequencyaggregationofload spectrumenergyandleadtopooreditingresults.Tosolvethisproblem，basedonthe theoryofgeneralisedS-transform（GST），theapplicationofGSTmethod inthe fieldofautomobilecomponentsload spectrumediting is explored.TheGSTmethod isusedtoperform time-frequencyanalysisof themountloadspectrumtoobtainthedistributioninformationoftheloadenergyonthetimeandfrequencyaxes.Theacumulative powerspectraldensity（APSD）oftheloadspectrum iscalculated，andageneticalgorithm isused todeterminethethreshold value oftheAPSDinordertoidentifythe timesegmentsoftheload spectrum withsmallerdamagecontributions.Thetimesegmentsof theloadspectrum withsmaldamagecontributionsareidentifiedandremoved，andtheremainingloadtimesegmentsaresplicedto obtainacompressedloadspectrum.ComparingwiththeloadspectrumeditingmethodbasedonS-transform，itisfoundthathe timecompressonof thecompressed load spectrumotained basedonthe GSTmethod islarger，and thecompresedload spectrumbasically matches withtheoriginalloadspectrumintermsoftatiticalparameters，powerspectraldensity，rainflowcounts， fatiguelifeanddamagedistribution.Theresultsshowthat theGSTmethodissuitableforeditingtheloadspectrumofautomotive components.Itcan provideaneffective means toimprove theeficiencyof durability bench tests ofautomotivecomponents.

Keywords： load spectrum editing; generalised S-transform; durability; time-frequency analysis; bench tests

耐久性台架试验可为预测汽车零部件薄弱环节的疲劳寿命提供先验信息，是汽车零部件在设计和制造过程中的关键环节[1]。（剩余11559字）