Vibration model of rolling element bearings in a rotor-bearing system for fault diagnosis
Vibration model of rolling element bearings in a rotor-bearing system for fault diagnosis
复制标题
用于故障诊断的转子轴承系统中滚动轴承的振动模型
DOI：
10.1016/j.jsv.2012.11.029
复制
发表时间：
2013-04-15
影响因子：
4.7
通讯作者：
Pecht, Michael
中科院分区：
文献类型：
--
作者：
Cong, Feiyun;Chen, Jin;Pecht, Michael
滚动元件轴承故障是旋转机器故障的主要原因之一。本文提出了一种基于转子轴承系统动载荷分析的滚动轴承故障模型。滚动轴承故障信号模型考虑了转子影响因子。轴承表面的缺陷载荷分为交变载荷和确定载荷两部分。研究了所提出的故障信号模型的振动响应，并通过动力学和运动学分析导出了故障信号计算方程。论文实现了外圈和内圈故障模拟。仿真过程包括考虑多个参数，例如转子轴承系统的重力、转子的不平衡性以及表面缺陷的位置。仿真结果表明，交变载荷和确定载荷的幅值贡献不同会导致包络谱表达式不同。除了故障特征频率之外，包络谱中还会出现旋转频率边带。这种边带的出现将增加智能故障诊断中故障识别的难度。论文给出的实验成功验证了所提出的信号模型仿真结果。转子轴承系统的试验台设计模拟了几种运行条件：（1）仅转子轴承； (2)加装机的转子轴承； (3)带有装载机和转子盘的转子轴承； (4)无转子影响的轴承故障模拟。实验结果验证了所提出的滚动轴承信号模型对于转子轴承系统滚动轴承故障诊断具有重要意义。 (c) 2012 Elsevier Ltd. 保留所有权利。
Rolling element bearing faults are among the main causes of breakdown in rotating machines. In this paper, a rolling bearing fault model is proposed based on the dynamic load analysis of a rotor-bearing system. The rotor impact factor is taken into consideration in the rolling bearing fault signal model. The defect load on the surface of the bearing is divided into two parts, the alternate load and the determinate load. The vibration response of the proposed fault signal model is investigated and the fault signal calculating equation is derived through dynamic and kinematic analysis. Outer race and inner race fault simulations are realized in the paper. The simulation process includes consideration of several parameters, such as the gravity of the rotor-bearing system, the imbalance of the rotor, and the location of the defect on the surface. The simulation results show that different amplitude contributions of the alternate load and determinate load will cause different envelope spectrum expressions. The rotating frequency sidebands will occur in the envelope spectrum in addition to the fault characteristic frequency. This appearance of sidebands will increase the difficulty of fault recognition in intelligent fault diagnosis. The experiments given in the paper have successfully verified the proposed signal model simulation results. The test rig design of the rotor bearing system simulated several operating conditions: (1) rotor bearing only; (2) rotor bearing with loader added; (3) rotor bearing with loader and rotor disk; and (4) bearing fault simulation without rotor influence. The results of the experiments have verified that the proposed rolling bearing signal model is important to the rolling bearing fault diagnosis of rotor-bearing systems. (c) 2012 Elsevier Ltd. All rights reserved.