Dynamic Behaviors of a Bolted Joint Rotor System Considering the Contact State at Mating Interface

The bolted joint is widely used in the aero-engine rotor system, which introduced a larger number of contact interfaces. These bolted joints are subjected to complex vibrations during operation and cause changes in the contact state at the mating interface, leading to a time-varying mechanical characteristics. This study aims to investigate the effect of the contact state at the mating interface on the dynamic behavior of the rotor system. Details are as follows: (1) obtaining the hysteresis curve of the bolted joint using the finite element method to explore the contact behavior at the mating interface; (2) an Iwan-based analytical model of bolted joint considering the contact state is proposed; (3) an adaptive parameter identification method for the analytical model is developed by using the initial loading data; (4) the dynamic model of bolted joint rotor system considering the contact state at the mating interface is established by multiscale relevance between the local joint structure contact state and rotor system, then relevant numerical studies were carried out, and (5) the numerical simulation results are verified by established bolted rotor test rig. The studies would provide guidance for the design of the aero-engine rotor system.