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ID:32417371
大小:1.40 MB
页数:5页
时间:2019-02-04
《铁路轨道几何数据冲击噪声小波-有序中值滤波方法》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、振动与冲击第33卷第10期JOURNALOFVIBRATIONANDSHOCKVol.33No.102014铁路轨道几何数据冲击噪声小波-有序中值滤波方法刘金朝,王卫东,孙善超,曲建军(中国铁道科学研究院基础所,北京100081)摘要:结合小波分析及有序中值方法(ROM),提出铁路轨道几何数据冲击噪声自动滤波方法。利用传统中值滤波技术滤除冲击噪声会减少信号的有用信息及质量,提出利用小波分析将信号分解成含冲击噪声的高、低频信号;利
2、用ROM自动识别高频信号中冲击噪声位置并滤波。据铁路轨道几何数据特点与阈值指标的内在关系,将ROM两阈值指标合并成一个,并据专家知识确定阈值。新方法具有简单、高效及强健优势,且可在线实现。用新方法对含冲击噪声的模拟信号、实测轨道不平顺信号进行滤波,结果表明该方法不仅能准确识别冲击噪声位置并自动修复,且能完整保留道岔处大轨向、大值超限等有用信息。关键词:小波-有序中值滤波器;轨道几何不平顺;冲击噪声;小波分析;有序中值方法中图分类号:U216.3文献标志码:ADOI:10.13465/j.cnki.jvs.2014.10.006
3、RemovingspikenoiseinrailwaytrackgeometricdatawithawaveletrankordermeanfilterLIUJinzhao,WANGWeidong,SUNShanchao,QUJianjun(InfrastructureInspectionCenter,ChinaAcademyofRailwaySciences,Beijing100081,China)Abstract:Analgorithmbycombiningwaveletdecompositionandranke
4、dordermean(ROM)methodwaspresentedfordetectionandremovalofimpulsespikenoiseintrackgeometricdataofrailwayinfrastructure.Randomeventsincludinganomalousreflectionofsunlight,sensorsanddatatransmissionerrorsalwayscausespikenoiseintrackdatameasured.Beingdifferentfromtheusu
5、alrandomnoise,impulsivenoiseisalocalnoise.Sothedirectuseofthetraditionalmeanfilteringtechnologytofilteroutspikenoisemayreducetheusefulfeaturesandqualityofasignal.Here,anewalgorithmwasdeveloped.Withit,waveletanalysiswasappliedtodecomposeasignalintohigherfrequencycomp
6、onentsincludingspikenoiseandlowerfrequencyones,andtheROMwasproposedtoautomaticallyidentifythelocationofimpulsivenoiseinthehigherfrequencycomponentsandtofilteritout.TwothresholdindicatorsofROMwerecombinedtooneonbasisoftheirinherentrelation,anditsthresholdwasdetermine
7、dbasedonexpertknowledge.Itwasshownthatthenewmethodhasadvantagesofrelativelysimple,efficientandrobust,andcanberealizedonline;themethodcanbeusedtoremovespikenoiseinanalogsignalsandthemeasuredtrackgeometricirregularityones;itisablenotonlytoaccuratelyidentifythelocation
8、ofspikenoiseandrepairsignals,butalsotoretainusefulfeaturesoflargeexceedingvalueandlargealignmentvaluewithinrailwayswitches.Keywords:wavele
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