中文摘要：

通过在-球-柱型轴连轴承上预置多种常见故障,采用半消声室声压测试方法,考察了含单一轴承故障的汽车水泵工作噪声,基于声压和时频域分析方法研究了轴承故障对汽车水泵工作噪声特性的影响.由此表明当水泵工作于发动机怠速附近时,轴承故障对水泵工作噪声增量的影响最明显.单一故障下的噪声时域波形表现出不同的冲击性特征;水泵400 Hz～3000 Hz内的噪声声压谱随轴承故障类型的不同而变化.另外,滚动体磨损成为水泵噪声最敏感因素,使水泵噪声声压谱呈宽频特性.滚道面伤使水泵增加高频主声源成分,同时,润滑脂异物及轴向游隙偏大也将引发高频滚道声.这些噪声特性均为水泵轴承的故障提供了识别的依据.

英文摘要：

Several kinds of common faults were prepared in the ball-and-roller type bearings. Noise of a faulty bearingof an automobile water pump was tested with sound pressure method in semi-anechoic room. Influence of bearing faults onwater pump noise performance was studied based on sound pressure and time-frequency domain analysis methods. The resultsshow that the bearing faults have obvious influence on the noise increment when the water pump is operating near theengine idle speed. The noise wave of the unitary bearing fault can display different shock wave characteristics in time domain.The sound pressure spectrum of the noise from 400 Hz-3 000 Hz of the water pump varies with different bearing faulttypes. Roller worn-out is the most sensitive factor of the water pump noise and make the sound pressure of the noise to havebroadband characteristics of frequency. New main noise sources which frequency was higher than the normal may appear forthe pump due to raceway scars in the bearing. Meanwhile, grease impurity and large axial clearance can also cause high-frequencyraceway noise. These noise characteristics have provided a basis for fault identification of water pump bearings.