Research on Robustness Analysis and Evaluation Method of Bearing-Support System

Abstract

Modern engines often use bearing outer ring with mounting edge in the front support structure of the rotor fan to reduce the number of parts and reduce the weight of the engine. During the working process, the front bearing of the fan is in a complex load environment. Among them, the bearing inner ring rotates at high speed with the rotor, which is subjected to significant centrifugal loads. Coupled with the periodic impact excitation caused by the non-synchronous procession, the lateral or angular impact load of the rotor, etc., the bearing and its supporting structure will produce a variety of damage accumulations, and even structural failures. To solve this problem, taking the structural system as the research object, considering the structural form and its rotor motion state under different load environments, and guided by the failure modes and their resulting mechanical processes, the quantitative evaluation parameters and calculation methods for two types of failure modes, interface contact failure and bearing failure, are proposed Among them, interface contact failure includes contact sliding, wear, and contact fatigue, and bearing failure includes tilt of inner and outer rings of bearings, rollers fall off, unsmooth movement when engine shutdown. On this basis, a method and process for evaluating the robustness of the bearing-support system have been developed.

The results show that the proposed evaluation method can effectively characterize the damage of bearing-support system under different loads, and determine the main damage modes, which can provide evaluation method support for bearing-support system damage control and robust decision.