Dynamic Load of the Inter-Shaft Bearing and Its Influence on Bearing’s Temperature

doi:10.3901/JME.2022.05.87

Abstract

Abstract: Thermal behaviors of the inter-shaft bearing under the dynamic load in aero-engine dual-rotor system are investigated by combining heat transfer and nonlinear dynamics. The dynamic load of the inter-shaft bearing is obtained based on dynamic responses of the dual-rotor system. Then substitute into Palmgren’s empirical formula to estimate the load friction heat and the viscosity friction heat of the inter-shaft bearing, based on which, an transient heat transfer model under the dynamic load of the inter-shaft bearing is presented. The temperature evolutions of the inter-shaft bearing are obtained by numerical calculation. It is found that the temperature of rollers is the highest while the temperature of outer ring is the lowest, and the rise rate of temperatures are the highest at first, then gradually decreases to zero. Furthermore, the effects of rotation speed, lubricant viscosity and ambient temperature on temperatures and friction heat of the inter-shaft bearing are analyzed afterwards. The results show that temperatures and the total friction heat of the inter-shaft bearing increase sharply and form two peaks in resonance zones of the dual-rotor system, while increase gradually in non-resonance zones of the system. In resonance zones, the load friction heat plays a decisive role; in non-resonance zones, the viscosity friction heat plays a decisive role. The lubricant viscosity has a significantly influence on the viscosity friction heat, thus it also affects the total friction heat and temperatures of the inter-shaft bearing. The ambient temperature only affects temperatures of the inter-shaft bearing. The dynamic load of the inter-shaft bearing can reflect the dynamic characteristics of the dual-rotor system to a certain extent. Therefore, the dynamic characteristics of the dual-rotor system have a significant influence on thermal behaviors of the bearing, which should be considered in the bearing design.

Key words: dual-rotor system, inter-shaft bearing, dynamic load, friction heat, heat transfer

CLC Number:

V231

GAO Peng, HOU Lei, CHEN Yu-shu. Dynamic Load of the Inter-Shaft Bearing and Its Influence on Bearing’s Temperature[J]. Journal of Mechanical Engineering, 2022, 58(5): 87-97.

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