Boundary for aviation bearing accelerated life test based on quasi-dynamic analysis

Full-scale bearing accelerated life test experiment is an effective way to achieve the demand of modern aero-engine bearing. However, its premise is how to determine the boundary reasonably. In this study, the factors leading bearing abnormal failure are presented by the fault tree analysis. Then, the boundary conditions of aero-engine bearing are analysed by the quasi-dynamic method. The relationship between status parameters associated with failure modes (such as lubricating oil film thickness, etc.) and working parameters (such as rotation speed, external load) is discussed. It revealed the interrelation between practical working condition and status parameters in graphical form. The analysis provided theoretical bases for the choice of working parameters and the ultimate failure judgment in the accelerated life test.