Sliding behavior of high speed ball bearings based on improved nonlinear dynamic model

To accurately predict the dynamic behaviors of high speed ball bearings, an investigation on the sliding behavior of balls at high and low speeds, and light and heavy loads is necessary. However, existing nonlinear dynamic models fail to consider comprehensively key factors such as asperity and hydrodynamic tractions, time-varying friction coefficient and time-varying lubricant mode. In this work, these influencing factors are integrated into the nonlinear dynamic model to make it suitable for the working conditions of high and low speeds and light and heavy loads. The dynamic analysis provides the relation of angular speeds of balls with spin and sliding at light and heavy loads, also it reveals the number of pure rolling point under the combined effect of differential sliding and spin sliding. Research results provide a reliable mathematical model and theoretical bases for further studying the dynamic behaviors of high speed ball bearings.

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Investigation of oil-air flow and temperature for high speed ball bearings by combining nonlinear dynamic and CFD models

Journal of Tribology ◽

10.1115/1.4052965 ◽

2021 ◽

pp. 1-11

Author(s):

Song Deng ◽

Guiqiang Zhao ◽

Dongsheng Qian ◽

Shaofeng Jiang ◽

Lin Hua

Keyword(s):

Nonlinear Dynamic ◽

High Speed ◽

Heat Dissipation ◽

Air Flow ◽

Engineering Application ◽

Elastohydrodynamic Lubrication ◽

Ball Bearings ◽

Nonlinear Dynamic Model ◽

Cfd Models ◽

Heavy Loads

Abstract An improved nonlinear dynamic model of high speed ball bearings with elastohydrodynamic lubrication (EHL) is adopted to predict the movements of balls and power loss of ball bearings for defining the boundary conditions of computational fluid dynamics (CFD) model. Then, this method of combining nonlinear dynamic and CFD models is are validated through the experimental verification. Subsequently, oil-air flow and temperature distribution inside the bearing chamber are studied at low and high speeds, and light and heavy loads. The effect of nozzle's position on the formation of oil film and heat dissipation is revealed under combined loads. The research results provide a theoretical basis for engineering application of high speed rolling bearings.

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Ball bearing skidding and over-skidding in large-scale angular contact ball bearings: Nonlinear dynamic model with thermal effects and experimental results

Mechanical Systems and Signal Processing ◽

10.1016/j.ymssp.2020.107120 ◽

2021 ◽

Vol 147 ◽

pp. 107120

Author(s):

Shuai Gao ◽

Steven Chatterton ◽

Lorenzo Naldi ◽

Paolo Pennacchi

Keyword(s):

Dynamic Model ◽

Nonlinear Dynamic ◽

Thermal Effects ◽

Large Scale ◽

Ball Bearing ◽

Experimental Results ◽

Ball Bearings ◽

Nonlinear Dynamic Model

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Nonlinear Dynamic Model of a Two-Stage Pressure Relief Valve for Designers

Journal of Dynamic Systems Measurement and Control ◽

10.1115/1.1435363 ◽

2001 ◽

Vol 124 (1) ◽

pp. 62-66 ◽

Cited By ~ 20

Author(s):

Pei-Sun Zung ◽

Ming-Hwei Perng

Keyword(s):

Dynamic Model ◽

Nonlinear Dynamic ◽

Dynamic Models ◽

Operating Conditions ◽

Model Parameters ◽

Nonlinear Dynamic Model ◽

Relief Valve ◽

Two Stage ◽

Pressure Relief ◽

Wide Range

This paper presents a handy nonlinear dynamic model for the design of a two stage pilot pressure relief servo-valve. Previous surveys indicate that the performance of existing control valves has been limited by the lack of an accurate dynamic model. However, most of the existing dynamic models of pressure relief valves are developed for the selection of a suitable valve for a hydraulic system, and assume model parameters which are not directly controllable during the manufacturing process. As a result, such models are less useful for a manufacturer eager to improve the performance of a pressure valve. In contrast, model parameters in the present approach have been limited to dimensions measurable from the blue prints of the valve such that a specific design can be evaluated by simulation before actually manufacturing the valve. Moreover, the resultant model shows excellent agreement with experiments in a wide range of operating conditions.

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