Rotor connection structure interface damage control and robust design method for its mechanical properties

Aiming at the structural mechanics of aero-engine rotor structure with uneven distribution of mass and stiffness, interfacial connection and large bending loads, the relationship between the mechanical properties of the rotor connection structure and the interface contact state is analyzed, reveals the influence of the degree of interface damage on the mechanical properties of the connection structure. And the quantitative evaluation parameters of connection interface slip and frictionfatigue damage degree suitable for engineering design are proposed. A robust design method for mechanical properties of rotor systems based on connection interface deformation coordination and rotor strain energy distribution control is established. By optimizing the geometrical characteristic parameters of the rotor structure, the bending strain energy distribution of the rotor under the working load environment is adjusted, it can effectively control the deformation and coordination of the connection interface, reduce the friction-fatigue damage of the connection interface, so that the sensitivity of themechanical properties of the connection structure to the applied load can be reduced, further ensure the robustness of the rotor’s dynamic characteristics. Taking the connection structure in the high-speed rotor system as an example, the simulation results show the effectiveness of the robust design of the mechanical connection with the interface connection rotor connection structure.