长拉杆-止口连接弯曲刚度损失及对转子系统振动响应影响

With the pursuit of higher output power and light weight of the aero-engine structure, the stiffness of the rotor structure has to be weakened, while the operational speed of the rotor is increased. These changes induce large bending deformation on the rotor in operation. The rotor structure system with multiple joints will experience a sudden change in contact characteristics at the joint interface when the rotor is exerted by the bending moment, and this sudden change will weaken the bending stiffness of these joints. Therefore, in the design span of the high-speed rotor system, the bending stiffness loss of the joint structure must be considered. In this paper, the contact status and stress distribution of the rod-rabbet joint interfaces are analyzed, followed by the establishment of the bending stiffness model of the joint. Based on the bending stiffness model, the dynamics of a typical rotor system is investigated. The simulation result reveals that the stiffness loss of the joints can significantly affect the dynamic characteristics of the rotor system, hence verifying the correctness of the bending stiffness loss model of the joint.