Purpose

This paper aims to research the tribological and dynamic characteristics of aeroengine hybrid ceramic bearings through wear experiments and simulation analysis.

Design/methodology/approach

First, the authors carried out wear experiments on Si₃N₄–GCr15 and GCr15–GCr15 friction pairs through the ball-disc wear test rig to explore the tribological properties of their materials. Second, using ANSYS/LS-DYNA simulation software, the dynamic simulation analysis of hybrid bearings was carried out under certain working conditions, and the dynamic contact stress of all-steel bearings of the same size was simulated and compared. Finally, the change of the maximum contact stress of the main bearing under the change of load and rotation speed was studied.

Findings

The results show that the Si₃N₄–GCr15 pair has better tribological performance. At the same time, under the conditions of high speed and heavy load, the simulation analysis shows that the contact stress between the ceramic ball and the raceway of the ring is smaller than the steel ball. That is, hybrid bearings have better transient mechanical properties than all-steel bearings. With the speed increasing to 12,000 r/min, the maximum stress point will shift in the inner and outer rings.

Originality/value

In this study, the tribological and transient mechanical properties of Si₃N₄ material were comprehensively analyzed through wear experiments and dynamic simulation analysis, which provided a reference for the design of hybrid bearings for next-generation aeroengines.

中文翻译：

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航空发动机混合陶瓷轴承摩擦学和动态特性实验与仿真分析

目的

本文旨在通过磨损实验和仿真分析来研究航空发动机混合陶瓷轴承的摩擦学和动态特性。

设计/方法论/途径

首先，作者通过球盘磨损试验台对Si ₃ N ₄ –GCr15和GCr15-GCr15摩擦副进行了磨损实验，探讨其材料的摩擦学性能。其次，利用ANSYS/LS-DYNA仿真软件，对混合轴承在一定工况下进行动态仿真分析，对相同尺寸的全钢轴承的动态接触应力进行模拟比较。最后研究了主轴承最大接触应力随载荷和转速变化的变化。

发现

结果表明Si ₃ N ₄ –GCr15对具有更好的摩擦学性能。同时，在高速、重载条件下，仿真分析表明，陶瓷球与套圈滚道之间的接触应力比钢球小。即混合轴承比全钢轴承具有更好的瞬态机械性能。随着转速增加到12000r/min，最大应力点将在内圈和外圈处发生移动。

原创性/价值

本研究通过磨损实验和动态仿真分析，全面分析了Si ₃ N ₄材料的摩擦学和瞬态力学性能，为下一代航空发动机混合轴承的设计提供参考。