Vibration analysis has been widely used for condition monitoring and fault diagnosis of rolling element bearings. The next step is to determine defect size from the measured vibrations which can be used in the decision making about the bearing replacement. This paper presents an experimental investigation of the defect size estimation from the vibration signals of two types of naturally generated defects, on the outer race and roller of two tapered roller bearings. Vibrations are measured at different shaft speeds and loads. The signatures generated by the entry of the rolling elements into and exit from the defective area are enhanced by the autoregressive model and envelope analysis. The duration between these two events is used to estimate the size of natural defects. The accuracy of the results is compared with the results obtained by the autoregressive model and discrete wavelet transform.

振动分析已广泛用于滚动轴承的状态监测和故障诊断。下一步是根据测得的振动确定缺陷尺寸，该尺寸可用于轴承更换决策中。本文对两种圆锥滚子轴承的外圈和滚子上两种自然产生的缺陷的振动信号进行了缺陷尺寸估计的实验研究。在不同的轴速度和负载下测量振动。通过自回归模型和包络分析，可以增强滚动元素进入缺陷区域和从缺陷区域退出所产生的特征。这两个事件之间的持续时间用于估计自然缺陷的大小。