Vibration Analysis of Bearing Cage Based on Explicit Dynamics of Complete Machine

In this paper, based on the structural characteristics of air turbine starter itself, a high-precision finite element model of the whole engine is established by adopting the step-by-step modeling and confirmation method of the structural dynamics of the whole engine. Transient dynamics simulation calculation of a certain type of aviation air turbine starter is carried out under normal and abnormal conditions, so as to obtain the characteristics of vibration influence that may be brought by abnormal conditions with assembly deviations. The mechanical state and dynamic characteristics of bearing cages are quantified and compared, and the results show that the deviation of double gear assembly is one of the main reasons for the breakage of turbine end-supported bearing cages, while the change of bearing preload and eccentric assembly in a limited range of turbine angles have relatively little influence.