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1、.一、Apparatus&Procedures(实验与采集装置)AsshowninFigure1above,theteststandconsistsofa2hpmotor(left),atorquetransducer/encoder(center),adynamometer(right),andcontrolelectronics(notshown).Thetestbearingssupportthemotorshaft.Singlepointfaultswereintroducedtothetes
2、tbearingsusingelectro-dischargemachiningwithfaultdiametersof7mils,14mils,21mils,28mils,and40mils(1mil=0.001inches).SeeFAULTSPECIFICATIONSforfaultdepths.SKFbearingswereusedforthe7,14and21milsdiameterfaults,andNTNequivalentbearingswereusedforthe28miland40
3、milfaults.Driveendandfanendbearingspecifications,includingbearinggeometryanddefectfrequenciesarelistedintheBEARINGSPECIFICATIONS.(如图所示,实验平台包括一个2马力的电机(左侧)(1hp=746W),一个转矩传感器(中间),一个功率计(右侧)和电子控制设备(没有显示)。被测试轴承支承电机轴。使用电火花加工技术在轴承上布置了单点故障,故障直径分别为0.007、0.014、0.0
4、21、0.028、0.040英寸(1英寸=2.54厘米)。其中前三种故障直径的轴承使用的是SKF轴承,后两种故障直径的轴承使用的是与之等效的NTN轴承。Vibrationdatawascollectedusingaccelerometers,whichwereattachedtothehousingwithmagneticbases.Accelerometerswereplacedatthe12o?clockpositionatboththedriveendandfanendofthemotorhou
5、sing.Duringsomeexperiments,anaccelerometerwasattachedtothemotorsupportingbaseplateaswell.Vibrationsignalswerecollectedusinga16channelDATrecorder,andwerepostprocessedinaMatlabenvironment.AlldatafilesareinMatlab(*.mat)format.Digitaldatawascollectedat12,00
6、0samplespersecond,anddatawasalsocollectedat48,000samplespersecondfordriveendbearingfaults.Speedandhorsepowerdatawerecollectedusingthetorquetransducer/encoderandwererecordedbyhand.(实验中使用加速度传感器采集振动信号,通过使用磁性底座将传感器安放在电机壳体上。加速度传感器分别安装在电机壳体的驱动端和风扇端12点钟的位置。在有些
7、实验中,传感器也被安放在电机支承底盘上。振动信号是通过16通道的DATword范文.记录器采集的,并且后期在MATLAB环境中处理。数字信号的采样频率为12000S/s,驱动端轴承故障数据同时也以48000S/s的采样速率采集。Outerracewayfaultsarestationaryfaults,thereforeplacementofthefaultrelativetotheloadzoneofthebearinghasadirectimpactonthevibrationresponseof
8、themotor/bearingsystem.Inordertoquantifythiseffect,experimentswereconductedforbothfananddriveendbearingswithouterracewayfaultslocatedat3o?clock(directlyintheloadzone),at6o?clock(orthogonaltotheloadzone),andat12o?clock(外圈的故障是固定不变的