阈值优化的自适应双向压缩变换及其在碰摩故障特征提取中的应用

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关键词：转静碰摩故障；双向压缩变换；瞬时频率；群延迟；调频率阈值 中图分类号：TH17；TH133 文献标志码：A DOI：10.16385/j.cnki.issn.1004-4523.202508038

Adaptive bi-directional maximal squeezing transform based on threshold optimization and its application in the feature extraction of rub-impact fault

HE Ya1，2 ，CHENYanqi1²，KEYibo1²，YINJianfei¹²，WENJihong12 （1.CollgeItellgceSienceandcholoNatioalUniversityoffesecholgy，hangha，ina；aioalKy LaboratoryofEquipmentStateSensingandSmartSupport，NationalUniversityofDefenseTechnology，Changsha41oo3，China）

Abstract：TheompositealsiducedbyotorstatorubmpactinotatigmachryebitifcantostatioaryfaturesEisting unidirectionaltifequcymeodstrugletsyhoouslyandearlyaracteethdyaicpropisofthistatasfrecy of harmonic modesandthegroupdelayofimpulsivemodes.Toaddressthisisse，thispaper proposesathreshold-optimizedadaptive bidirectioalsquezigtasfommetodBythecorationanalysisbetweeninstantaneous frequencyandgoupelay，theistantaeous frequencychangerate（ie.，chiprate）isidentfiedasakeyfactor.Achirpatethresholdbasedonenergydifusioncharacteristisis constructedtoachieveaccuratedistinctionofmodeatributesandadaptiveselectionofsquezingstrategiesFurthermore，anadaptive estimatorof instantaneousfrequencyandgroupdelaybasedonthelocalmaximumcriterionisproposedtoenhancethetime-frequency concentrationofbidirectionalsquezingforstronglymodulatedmodesSimulationandexperimentanalysisshowthatthismethodcan synchronouslycharacterizestronglytime-varyingamonicmodesandstroglyfrequenyvaringimpusivemodeswithghesolutiowile maintainingtepfectsignalrconstructioncapabilityThreseachesultsofthispaperotonlycanaccuratelyxtractoliearibtio charaterstiofactultpotacutoidblalprteto rub-impact fault evolutionmechanism.

Keywords：rototatobpctflt;bdalialsuegtsfostatfrcpelayted

转静碰摩是离心压缩机、汽轮机、航空发动机等高速旋转机械最常见的故障模式之一，严重威胁机组的使用寿命与安全运行[]。（剩余19642字）