Time-varying displacement excitation and dynamic modeling of local defects in angular contact ball bearings
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摘要:
角接触球轴承在长时间工作的情况下，会产生故障损伤从而影响系统正常运行。以外圈具有局部缺陷的角接触球轴承为研究对象，提出不同局部缺陷轮廓的判别方法，建立角接触球轴承局部缺陷时变位移激励广义表征模型，研究局部缺陷演化过程及其位移激励机理。在此基础上，考虑轴承缺陷引起的时变位移对动力学特性的影响，基于赫兹接触理论，建立角接触球轴承故障动力学模型，并通过实验验证了所建模型的正确性。分析结果表明：矩形局部缺陷最终会演化成梯形形态；不同缺陷形貌诱发的位移激励变化趋势是不同的；与局部缺陷的长度相比，宽度对位移激励的影响更大。研究结果对轴承优化设计和故障诊断提供了理论基础。
Abstract:Angular contact ball bearings will suffer from fault damage after working for a long time, thus affecting the normal operation of the system. In this paper, angular contact ball bearingswith local defects in the outer ring were taken as the research objects, and the discrimination methods of different local defect contours were proposed. A generalized representation model of time-varying displacement excitation of local defects in angular contact ball bearing was established, and the evolution process of local defects and its displacement excitation mechanism were studied. On this basis, the influence of time-varying displacement caused by bearing defects on dynamic characteristics was explored, and a fault dynamic model of angular contact ball bearings was established based on Hertz contact theory. The correctness of the model was verified by experiments. The results show that the rectangular local defects will eventually evolve into trapezoidal local defects. The changing trend of displacement excitation induced by different defect morphologies is different. Compared with the length of the local defect, the width has a greater influence on the displacement excitation. The research results provide a theoretical basis for bearing optimization design and fault diagnosis.
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图 2 局部缺陷轮廓类别划分简图
Figure 2. Diagram of classification of local defect contour categories
图 3 轴承外圈矩形缺陷轮廓表征
Figure 3. Characterization of rectangular defect contour in outer ring of bearing
图 4 轴承外圈三角形缺陷轮廓表征
Figure 4. Characterization of triangular defect contour in outer ring of bearing
图 5 轴承外圈梯形缺陷轮廓表征
Figure 5. Characterization of trapezoidal defect contour in outer ring of bearing
图 10 本文动力学模型外圈损伤振动响应
Figure 10. Vibration response of fault in outer ring of the proposed dynamics model
图 11 滚动体陷入矩形缺陷时的位移激励
Figure 11. Displacement excitation of rolling element trapped in rectangular defect
图 12 滚动体陷入三角形缺陷时的位移激励
Figure 12. Displacement excitation of rolling element trapped in triangular defect
图 13 滚动体陷入梯形缺陷时的位移激励
Figure 13. Displacement excitation of rolling element trapped in trapezoidal defect
图 14 滚动体陷入矩形局部缺陷时的位移激励
Figure 14. Displacement excitation of rolling element trapped in rectangular local defect
图 15 滚动体陷入梯形局部缺陷时的位移激励
Figure 15. Displacement excitation of rolling element trapped in trapezoidal local defect
图 16 本文动力学模型外圈局部损伤振动响应
Figure 16. Vibration response of local fault in outer ring of proposed dynamics model
表 1 H7013C轴承基本参数
Table 1. Basic parameters of H7013C bearing
内圈
直径/mm外圈
直径/mm滚动体
直径/mm滚动体
个数轴承
宽度/mm初始
接触角/
(°)滚动体
密度/
(g·cm−3)65 100 8.73 25 18 15 3.2 
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