Crack Propagation-Based Remaining Useful Life Prediction of the Belleville Spring in Linear Oscillating Motor

摘要

A novel prediction model for the remaining useful life (RUL) of a Belleville spring based on crack propagation is proposed in this paper. The linear oscillating motor(LOM), which directly provides short stroke reciprocating motion, is extensively utilized in linear actuation systems. Belleville springs are used for mechanical resonance to counteract mover kinetic energy, and prove to be the vital component of LOM to achieve high efficiency. Failure resulting of Belleville springs from fatigue is the main failure mode of LOM in high-frequency applications. From fatigue crack initiation to complete failure, the timely and accurate prediction of Belleville spring's RUL has important significance on motor performance evaluation and flight safety especially for aircraft's Linear Electro-Hydraulic Actuator (LEHA). The Paris formula is used to describe the propagation velocity and the damage process is cumulated by the Miner rule. The RUL of different configuration and material Belleville springs can be predicted by the proposed method, which improves the design of LOM.