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时间:2020-03-25
《基于声发射主轴机械密封端面开启状态识别技术.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2014年4月润滑与密封Apr.2014第39卷第4期LUBRICATIONENGINEERINGV01.39NO.4DOI:10.3969/j.issn.0254—0150.2014.04.013基于声发射主轴机械密封端面开启状态识别技术张尔卿傅攀吴希曦张君凯(1.西南交通大学机械工程学院四川成都610031;2.四川日机密封件股份有限公司四川成都610045)摘要:针对机械密封端面开启状态确定和端面开启厚度测量困难这一问题,提出基于声发射信号端面开启状态监测技术。将电涡流传感器安装在密封装置静环上,将声发射传感器安装在静环座上,分别对动静环之间端面开启状态进行内部直接测量和外
2、部间接检测。把采集的声发射信号运用小波阈值降噪法进行降噪处理后,提取典型的小波包能量特征。建立RBF神经网络模型,将提取的小波能量特征作为模型的输入,对机械密封端面开启状态进行识别。与电涡流传感器测量结果比对表明,声发射技术能够对机械密封开启状态进行准确的识别。利用声发射识别技术,实现了对主轴机械密封油膜开启状态由“内测”到“外测”的转变,便于工业现场应用和推广。关键词:主轴;机械密封;声发射;小波包;神经网络中图分类号:TH133.2;TP183文献标识码:A文章编号:0254—0150(2014)4—067—7StudyonMechanicalSealLift.oI】FRec
3、ognitionofMainShaftBasedonAcousticEmissionZhangErqingFuPanWuXixiZhanflJunkai(1.SchoolofMechanicalEngineering,SouthwestJiaotongUniversity,ChengduSiehuan610031,China;2.SichuanSunnySealCo.,Ltd,ChengduSichuan610045,China)Abstract:Forthedifficultyonthedeterminationofopenpositionandthemeasurementof
4、endfacethicknessformechanicalseal,themethodbasedonacousticemissionsignalendfaceopenconditionmonitoringtechnologyformechanicalsealwasproposed.Thedirectmeas-urementintheinternalofmechanicalsealdevicewasperformedbyfixingtheelectric6ddycurrentsensorinthestatorring,andtheindi—tintheoutsidewasperfo
5、rmedbyfixingtheacousticemissionsensorinthestatorringseat.Theacousticemissionsignalswerede—noisedbywaveletthresholdde—noisingmethod,andtherepresentativeenergyfeatureswereselectedbywaveletpacketenergyspec—trumalgorithm.TheRBFneuralnetworkmodelwasestablished,andbyinputtingtheextractedwaveletener
6、gyfeatures,themechanicalsealopeningpositionwasidentified.Theresultswerecomparedwiththedatadetectedbyelectriceddycurrentsensor,andtheacoustice—missionidentificationtechnologywasconfirmedtobeaccurateandefective.Theacousticemissiontechnologycanrealizetheidentificationofthemechanicalsealopeningpo
7、sitionofmainshaftfrominsidetooutside,itisconvenienttobeusedandpromotedinindustrialfield.Keywords:mainshaft;mechanicalseal;acousticemission;waveletpacket;neuralnetwork机械密封是目前广泛应用的旋转轴用动密封,其端面开启状态监测显得更为重要。目前使用电容传感性能可靠,使用寿命长,功耗低,维护成本不高,且器和电涡流等传感器
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