Dynamic modeling and vibration response simulations of angular contact ball bearings with ball defects considering the three-dimensional motion of balls.pdfVIP

Tribology International 109 (2017) 26–39 Contents lists available at ScienceDirect Tribology International journal homepage: /locate/triboint Dynamic modeling and vibration response simulations of angular contact ball bearings with ball defects considering the three-dimensional motion of balls Linkai Niua,?, Hongrui Caob, Xiaoyan Xionga a Key Laboratory of Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan University of Technology, Taiyuan, 030024 China b Stake Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China MARK ARTICLE INFO Keywords: Angular contact ball bearings Ball defect Bearing dynamics Fault diagnosis ABSTRACT A dynamic model to investigate the dynamics and vibration responses of angular contact ball bearings with ball defects is proposed. In the proposed model, each ball has 6 degrees of freedom (DOFs), meaning that the threedimensional motion of balls is considered. The results show that whether a ball hit a race and the frequency property of the envelope spectrum largely depend on the geometrical characteristics and operating conditions. This increases the di?culty in diagnosing the ball defect when using vibration-based monitoring techniques. The current investigation suggests that the vibration response simulations should be carried out to investigate the vibration mechanism and to diagnose the ball defect more e?ectively. 1. Introduction Rolling element bearings as one of the most important components of the system, have been widely used in modern industrial machineries. Bearing defects largely threaten the safety and the reliability of the whole machine. As the vibration response of the bearing could be signi?cantly changed when the bearing has surface defects on the races and the rolling elements, vibration-based monitoring has been widely investigated by many researchers to diagnose bearing defects. Extracting the fault features indicating the occurrence of bearing