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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.Singlepointfaultswereintroducedtothetestbearingsusingelectro-dischargemac
2、hiningwithfaultdiametersof7mils,14mils,21mils,28mils,and40mils(1mil=0.001inches).SeeFAULTSPECIFICATIONSforfaultdepths.SKFbearingswereusedforthe7,14and21milsdiameterfaults,andNTNequivalentbearingswereusedforthe28miland40milfaults.Driveendandfanendbearingspecifications,includingbearingge
3、ometryanddefectfrequenciesarelistedintheBEARINGSPECIFICATIONS.（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、0.021、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。Vibrationdatawascollecte
4、dusingaccelerometers,whichwereattachedtothehousingwithmagneticbases.Accelerometerswereplacedatthe12o?clockpositionatboththedriveendandfanendofthemotorhousing.Duringsomeexperiments,anaccelerometerwasattachedtothemotorsupportingbaseplateaswell.Vibrationsignalswerecollectedusinga16channel
5、DATrecorder,andwerepostprocessedinaMatlabenvironment.AlldatafilesareinMatlab(*.mat)format.Digitaldatawascollectedat12,000samplespersecond,anddatawasalsocollectedat48,000samplespersecondfordriveendbearingfaults.Speedandhorsepowerdatawerecollectedusingthetorquetransducer/encoderandwerere
6、cordedbyhand.（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DAT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,thereforeplacementofthefaultrelativetotheloadzoneofthe
7、bearinghasadirectimpactonthevibrationresponseofthemotor/bearingsystem.Inordertoquantifythiseffect,experimentswereconductedforbothfananddriveendbearingswithouterracewayfaultslocatedat3o?clock(directlyintheloadzone),at6o?clock(orthogonaltotheloadzone),andat12o?clock（外圈的故障是固定不变的，因此故障相对于
