Angular contact ball bearings are widely used in rotary machines for their combined loads capacity, i.e., simultaneously acting radial and axial loads. Spall defect is one of the most important potential failure modes of the rolling element bearings. The main motivation of this study is to achieve a true perception of the spall defect influence on the angular contact ball bearing to predict bearing failure. In this paper, simulation and experimental analysis are performed for an angular contact ball bearing with a spall defect in the outer race. At first, the bearings without and with outer race defect are modeled, and after extracting the governing equations, they are solved using function ODE45 in MATLAB. This function implements a Runge–Kutta method with a variable time step for efficient computation. Then the vibration response in different conditions of rotating speed and axial preload is simulated. A bearing test bench is designed to perform the experimental tests. The defect is contrived in the outer race of a healthy bearing, and the vibration signals at both conditions (healthy and defective) are collected. The spall defect in the outer race is considered to have a cylindrical shape to close the model to real conditions as much as possible. The results are then presented in the form of time-domain signals and fast Fourier transformations (FFT) graphs. The FFT results showed that defect in the outer race produces dominant peaks with a suitable similarity to each other in both simulations and experimental tests.

角接触球轴承以其组合的负载能力（即同时作用于径向和轴向负载）而广泛用于旋转机械中。剥落缺陷是滚动轴承的最重要的潜在故障模式之一。这项研究的主要动机是要真正了解剥落缺陷对角接触球轴承的影响，从而预测轴承故障。本文对外圈有剥落缺陷的角接触球轴承进行了仿真和实验分析。首先，对没有外圈缺陷和外圈缺陷的轴承进行建模，并提取控制方程后，使用MATLAB中的ODE45函数对其进行求解。此函数可实现具有可变时间步长的Runge–Kutta方法，以进行有效的计算。然后，模拟了不同转速和轴向预紧条件下的振动响应。轴承测试台设计用于执行实验测试。缺陷是由健康轴承的外圈造成的，并且收集了两种情况（健康和不良）下的振动信号。外圈的剥落缺陷被认为是圆柱形，以使模型尽可能接近实际条件。然后，结果以时域信号和快速傅立叶变换（FFT）图的形式呈现。FFT结果表明，外环中的缺陷会在模拟和实验测试中产生彼此具有适当相似性的主峰。缺陷是由健康轴承的外圈造成的，并且收集了两种情况（健康和不良）下的振动信号。外圈的剥落缺陷被认为是圆柱形，以使模型尽可能接近实际条件。然后，结果以时域信号和快速傅立叶变换（FFT）图的形式呈现。FFT结果表明，外环中的缺陷会在模拟和实验测试中产生彼此具有适当相似性的主峰。缺陷是由健康轴承的外圈造成的，并且收集了两种情况（健康和不良）下的振动信号。外圈的剥落缺陷被认为是圆柱形，以使模型尽可能接近实际条件。然后，结果以时域信号和快速傅立叶变换（FFT）图的形式呈现。FFT结果表明，外环中的缺陷会在模拟和实验测试中产生彼此具有适当相似性的主峰。然后，结果以时域信号和快速傅立叶变换（FFT）图的形式呈现。FFT结果表明，外环中的缺陷会在模拟和实验测试中产生彼此具有适当相似性的主峰。然后，结果以时域信号和快速傅立叶变换（FFT）图的形式呈现。FFT结果表明，外环中的缺陷会在模拟和实验测试中产生彼此具有适当相似性的主峰。