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ID:36439723
大小:6.29 MB
页数:77页
时间:2019-05-10
《基于分形理论的刀具磨损状态识别研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西南交通大学硕士学位论文基于分形理论的刀具磨损状态识别研究姓名:朱丽琴申请学位级别:硕士专业:测试计量技术及仪器指导教师:傅攀20090101西南交通大学硕士研究生学位论文第1I页AbstractInmUlmgprocess,surfacequalityanddimensionalaccuracyoftheworkpieceisaffectedbycutting-toolweal"condition.Tosurveyanddefinecutting-toolwearexactly,itisallimportantpr
2、obleminautomationproductiontobeurgemlysolvedatpresent.Cutting-toolwe&risaverycomplexprocess.VariousfactorshaveadirectorIndirecteffect011cutting-toolweal',resultinginuncertainty.Soit.isdifficultforexperimentaldataandresulttohavegoodstability.Furtherstudieshavesh
3、ownthatcutting-toolwearisnon-linear,randomanddissipated.TherearealargenumberOfnon-stationarysignalsinthefieldsofconditionmonitoringandfaultdiagnosisforcutting-t001.Researchinganddevelopingeffectiveengineeringmethodsforprocessingnon-stationarysignalsarenecessary
4、forpromotingsustaineddevelopmentoffaultdiagnosistechnology.Vibrationanalysisisaveryimportantmeansforconditionmonitoringandfaultdiagnosis.Thispaperaimsattheresearchonthemethodsofsignalprocessingandpatternrecognition.Therefore,firstly,anexperimentalplatformwasset
5、upforthefailurediagnosisofcutting-tool,onwhichwehavedonealotofexperiments.Thenthevibrationsignalsofcutting-toolindifferentwearconditionswerecollected.Waveletnoisereductionisusedtopretreatthevibrationsignals.Themethodoffractalrecognitioncarldiagnosticatetheweard
6、egreequantificationally.Accordingtothenon-stationarityofvibrationsignals,weintroducethede-noisingmethodbasedonwaveletdecompositionandreconfiguration.Theinfluenceondenoisingeffectiscomparedbyusingdifferentmotherwaveletandwaveletthresholdrules.Forthetestdataofthi
7、sthesis,thedenoisingeffectadoptingthemotherwavelet‘db4’andthedefaultthresholdruleisthebest.Thispaperintroducesthealgorithmofboxdimensionandinformationdimensionfromthepointofviewofengineeringapplication.Theinfluenceofnoiseonthecomputationalprecisionofboxdimensit
8、ionisdiscussed.Thealgorithmofcorrelationdimension(G-Palgorithm)isinterpretedandthemethodtochooseparametersisgiven.Time-delayandMininlunlEmbeddingDimensionhaveobtainedbyusing
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