Dynamic investigation of aeroengine high pressure rotor system considering assembly characteristics of bolted joints

Bolted connection is the basic connection form of combined rotor system for aeroengine, and its connection performance directly determines the dynamic characteristics of the rotor system. However, there are few studies on the dynamic characteristics of the rotor considering joint interface assembly parameters. Thus, the mechanical model of the bolted joint is presented by characterizing the mechanical relationship between the adjacent nodes of the joint interface. Then, in term of the mechanics model of joint interface and finite element method, the rotor assembly dynamic model of drum-disk-shaft is established. The influence of rotational speed, unbalance and joint interface stiffness on the dynamic response of the rotor is analyzed. By establishing the finite element model (FEM) of the test-bed, the maximum error is 6.1% compared with the experimental mode, which verifies the rationality of the FEM considering connecting bolts pretightening. Finally, the FEM of the aeroengine high pressure rotor system is established to study the dynamic characteristics of the rotor system under different pre-tightening conditions, which provides a theoretical basis for detecting and identifying the performance of the bolt joint of the aeroengine rotor system.