航空发动机传动轴承多支承台架试验失效机理分析

As a key part of the aero engine, the operational status and reliability of the whole system are directly determined by the performances of the transmission system. Since the rugged working conditions of the support bearings in the transmission system, some incipient failures are often produced. To analyze the incipient failures in the support bearings in the transmission system of an aero engine in a bench test with multiple supports, a dynamic model based on the finite element method for the flexible transmission system with the multiple supports is proposed. The effects of the rotor speed and bearing clearance on the dynamic loads and displacement of the support bearings are studied, which are used to determine the failure location in the support bearings. According to Lundberg and Palmgre’s method, the fatigue life of the selected support bearing is calculated by using the dynamic loads from the proposed dynamic model. The results show that different bearing clearance cases can produce a very different bearing loads, which is the main fatigue failure reasons of the support bearing. The simulation results are very close to the practical situation. This work can provide some new guidance and theoretical support for the optimization design of the support bearings in the transmission systems of the aero engine.