美国西储大学轴承资料1.doc

Apparatus Procedures（实验与采集装置） As shown in Figure 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 horsepower data were collected using the torque transducer/encoder and were recorded by hand. （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。 Outer raceway faults are stationary faults, therefore placement of the fault relative to the load zone of the bearing has a direct impact on t