A 4-DOF dynamic model for ball bearing with multiple defects on raceways

Proceedings of the Institution of Mechanical Engineers, Part C:

Liu

et al. 2023

Self Cite

Dynamic modelling of rolling element bearing (REB) is a significant method to explore the vibration mechanism generated by fault, and it is the theoretical basis of fault diagnosis of REBs. Aiming at the complexity of defect-rolling-element interaction under radial load, the whole contact process of rolling element (RE) passing over defective area of outer or inner ring is analysed in detail. The impact force excitation function is derived by rotation and revolution velocity of RE. A four degree-of-freedom (DOF) dynamic model of REB with compound fault of both inner and outer raceway surface is developed by considering the time-varying displacement, impact force excitative and elastohydrodynamic lubrication (EHL) condition, and the novelty of the model is that the improved impact force excitation function is used. The experimental validation is carried out on test tig of Machinery Fault Simulator. The change of impact force with shaft speed and defect size is analysed. It is shown that the simulation results of the proposed model are closer to experimental results. A mapping method from defect-rolling-element-defect (DRED) behaviour to time is proposed to study the vibration characteristics of DRED behaviour, the results show that the amplitude of vibration will decrease when the same RE collides with inner and outer raceway defects simultaneously. When the same RE collides with inner and outer raceway defect successively, the amplitude of vibration will reach the maximum during the inner raceway defect rolling over each RE once. The proposed model can be used in practical application to study the influence of compound defects on vibration response of REB.

Section: Introductionmentioning

confidence: 99%

Dynamic response of rolling element bearing with compound fault considering defect-rolling-element interaction

Luo

Proceedings of the Institution of Mechanical Engineers, Part C:

Liu

et al. 2023

Self Cite

“…Li et al 15 developed a nonlinear model for REBs with multi-point defects on the outer raceway and investigated the effect of the number, location and size of the defects on the dynamic characteristics of bearings. Gao et al 16 created a 4 DOFs dynamic model for REB and investigated the vibration characteristics of bearings under the impact of multi-point defects on the raceways. Using a three-dimensional analysis method, Gupta 17 representatively suggested an extensive dynamic model for REB in order to characterize the motion and force states of its components.…”

Section: Introductionmentioning

confidence: 99%

Dynamic modelling of deep groove ball bearings with different local defects considering skidding and thermal elastohydrodynamic lubrication

Tian

Proceedings of the Institution of Mechanical Engineers, Part K:

Liu

et al. 2023

Self Cite

The vibration characteristics and skidding behaviour of deep groove ball bearings (DGBBs) are significantly influenced by the evolution of local defects and thermal effects. In previous studies, the influences of skidding and thermal effects were not considered in order to simplify the model of defective bearings. But the presence of skidding and thermal should not be ignored to accurately simulate the operation of bearing. To gain a comprehensive understanding of the operational mechanism of defective bearings, it is crucial to examine the skidding and thermal characteristics of various defect types using dynamic modelling approaches. In this study, the DGBB dynamic model for seven types of defects is established, which considers the self-rotation, rotation, and radial motion of ball, the contact force, ball/cage and ball/raceway skidding, and the effects of thermal elastohydrodynamic lubrication (TEHL). Experimental data from a machine fault simulator test rig is utilized to validate the accuracy of the proposed modelling methods. The results indicate that compound defects (CDs) (CDs) result in higher vibration amplitudes and more severe skidding phenomena compared to single defects (SDs). Furthermore, compound defects exhibit a greater thermal effect on the oil film in the contact area than SDs, significantly impacting the operational performance of the bearing.

“…Turnbull et al 21 integrated the elastodynamics with outer raceway for ball bearing into a dynamic model to analyse the power loss of bearing and lubricating performance of contact zone. Gao et al 22 considered the influence of lubricating oil film and presented a dynamic model with multiple surface defects for ball bearing to study the included angle and number of defects on vibration response. Considering the influence of lubricating oil, Wen et al 23 built a complete 14-DOF model of defective ball bearing to analyse the collision between ball and cage in defect area.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal elastohydrodynamic lubrication on vibration characteristics of ball bearing with local defect

Wang

Proceedings of the Institution of Mechanical Engineers, Part K:

Zheng

et al. 2022

Self Cite

The vibration response of ball bearing with local defect is closely associated with its lubrication condition. The previous bearing dynamic models were mainly established based on the idealised lubrication conditions, which may not uncover the influence of thermal effect of lubricant on vibration characteristics of defective bearing. This paper presented the influence of thermal effect on elastohydrodynamic lubrication (EHL) performances of ball bearing and the vibration characteristics of defective bearing under thermal EHL. Considering the point contact thermal EHL and the time-varying displacement excitation, a dynamic model of ball bearing with a localised defect on outer raceway was developed. The model was validated by the experimental results. Compared with isothermal EHL, the simulation results with thermal EHL reveal larger pressure and thinner film thickness in the ball-raceway contact interface. Meanwhile, the rotating speed and radial load have significant effects on the thermal EHL performance of ball bearing. The effects of three contact conditions (dry friction, isothermal and thermal EHL) on vibration amplitude of defective bearing in frequency domain are discussed. The results show that the lubricant could improve the vibration of defective bearing, whereas the addition of thermal effect of EHL could increase the vibration amplitude and deteriorate the lubricating performance. The model is beneficial to the bearing model optimisation and the rational selection of lubricants.