英语翻译4.Experimental proceduresThe fatigue gear tests were per

英语翻译
4.Experimental procedures
The fatigue gear tests were performed at a rotational speed of 745 rpm and applied torques of 220,147 and
73Nm.Two tests were undertaken at each torque to ensure repeatability.At regular intervals (ranging from
15 to 55 h depending on the applied torque levels),visual inspection of gear surface damage was undertaken,
oil sump temperatures were measured and oil samples were drawn for SOA (see Tables 1 and 2).Continuous AE rms values from the bearing casing and pinion gear were calculated in real-time by the analogue-to-digital converter (ADC) controlling software.This software employed a hardware accelerator to
perform calculations in real-time for a programmable time interval set by the user,10 ms in this instance and a
sampling interval of 90 ms was employed.Anti-aliasing filters were also employed prior to the ADC.Raw
vibration waveforms,sampled at 8192 Hz,were recorded for a period of 1 s at intervals of 30 min.Vibration
rms values were calculated over the recorded duration (1 s).
During the inspection interval,gear teeth surfaces on both the pinion and gear were visually inspected for
pitting or other abnormalities such as scoring and scuffing.The largest pitted area on any single tooth was
recorded.The authors set the failure,or test termination,criterion at 50% pitted area of the gear tooth surface
area.The visual inspections were performed by two separate inspectors independently and repeated for
consistency.This inspection error was determined to be 75% of pitted area.
The spectrometer used for SOA is an Atomic Emission type,namely inductively coupled plasma (ICP).The
analysis was performed by subjecting the oil sample to high-voltage plasma which energises the atomic
structure of the metallic elements,causing emission of light.The emitted light is subsequently focused into the
optical path of the spectrometer and separated by wavelength,converted to electrical energy and measured.
The intensity of the emitted light for any element is proportional to the concentration of wear metal suspended
in the lubricating fluid.The ICP used for determining levels of Fe elements in the lubricating fluid had an
accuracy of 73% at an average precision of 95% confidence level.

4.实验过程
齿轮疲劳测试分别以220,147,73Nm的扭矩和745rpm的转动速度进行.每种扭矩情况进行两次实验以保证可重复性.在常规的时间间隔下（范围从15小时到55小时之间,取决于施加的扭矩水平）齿轮表面损坏程度的视觉检查需要进行,机油池温度需要测量,机油样本需要取出给SOA（见表一和表二）.从轴承壳和（bearing casing）和小齿轮（pinion gear）测量的持续AE rms值需要用模拟到数字信号的转换器（ADC）控制软件来实时计算.这个软件应用了一个硬件加速器来为可由用户设定的时间间隔（例子中的10ms和90ms取样间隔）进行实时计算.图像保真滤波器同样运用在ADC之前.原始振动波形,取样频率8192Hz,在30min的间隔中记录下来,周期为1s.振动rms值从记录的持续时间（1s）中计算得来.在检查间隔中,小齿轮和普通齿轮的齿表面应当注意肉眼检查蚀损斑和其他异常情况如划痕及刮伤.单个齿轮齿上最大的凹痕应当记录下来.作者把失败或者实验终止条件的标志定在了50%齿轮齿表面凹痕区域.肉眼检查应当由两个分开的检查者单独和连续地进行.检查错误定为75%的凹痕区域.用于SOA的分光仪为Atomic Emission型,即电感耦合等离子体inductively coupled plasma (ICP).分析应通过把机油样本放入能使金属元素原子层活跃而发出光的高压等离子体中.发射出的光跟着被聚集到一条分光计的光学通道中,根据波长分离然后转换成电能后供测量.元素发射出来的光的强度跟润滑油中悬浮的磨损金属颗粒的浓度成正比.用作决定润滑油中铁元素水平的ICP有73%的accuracy和平均95%的precision.