Apparatu s & Procedu res（实验与采集装置） As shown in Figu re 1 above, the test stand consists of a 2 hp motor (left), a torque transducer/encoder (center), a dynamometer (right), and control electronics (not shown). The test bearings support the motor shaft. Single point faults were introduced to the test bearings using electro-discharge machining with fault diameters of 7 mils, 14 mils, 21 mils, 28 mils, and 40 mils (1 mil=0.001 inches). See FAULT SPECIFICATIONS for fault depths. SKF bearings were used for the 7, 14 and 21 mils diameter faults, and NTN equivalent bearings were used for the 28 mil and 40 mil faults. Drive end and fan end bearing specifications, including bearing geometry and defect frequencies are listed in the BEARING SPECIFICATIONS. （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。 Vibration data was collected using accelerometers, which were attached to the housing with magnetic bases. Accelerometers were placed at the 12 o?clock position at both the drive end and fan end of the motor housing. During some experiments, an accelerometer was attached to the motor supporting base plate as well. Vibration signals were collected using a 16 channel DAT recorder, and were post processed in a Matlab environment. All data files are in Matlab (*.mat) format. Digital data was collected at 12,000 samples per second, and data was also collected at 48,000 samples per second for drive end bearing faults. Speed and horsepow...
