Nonlinear Time-varying Parameter Dynamic Model of Rolling Bearing and Failure Mechanism Research

doi:10.3901/JME.2022.19.139

Abstract

Abstract: Research on the vibration mechanism and vibration characteristics of the faulty bearing based on the dynamic model of the rolling bearing fault is the basis for the accurate diagnosis of the bearing fault. In order to describe the impact of rolling bearing defects on its vibration response characteristics, considering the relative geometric relationship between rolling elements and defects, a nonlinear dynamic model of rolling bearing faults coupled with time-varying contact deformation and time-varying stiffness is proposed. Taking NSK6205 deep groove ball bearing as the object, a 6+N_b degree of freedom nonlinear time-varying parameter dynamic model was established to accurately describe the process of contact deformation, contact stiffness and vibration response of rolling body as it passed through the outer ring defect area, and the variation law of fault impact vibration response characteristics of rolling bearing under different defect sizes was obtained. Theoretical analysis and experimental research results show that as the size of the defect increases, the vibration response of rolling bearing faults will change from double shock to multiple shocks. Under different defect sizes, the impact response of the rolling elements during the process of entering and leaving the defect is significantly different. The research results provide a theoretical basis for realizing the fault size judgment of rolling bearing based on vibration response.

Key words: rolling bearing, dynamic model, time-varying contact deformation, time-varying stiffness, fault feature

CLC Number:

TG156

HU Aijun, JI Xinxing, XIANG Ling, WANG Liyong. Nonlinear Time-varying Parameter Dynamic Model of Rolling Bearing and Failure Mechanism Research[J]. Journal of Mechanical Engineering, 2022, 58(19): 139-147.

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