高速转子连接结构刚度损失及振动特性

To achieve high loading and light weight, the speed and the support span of aero-engine rotor continue to increase, which leads to the degradation of rotor bending stiffness and the bending deformation of the rotor. There will be bending stiffness loss at interfaces when the rotor has bending deformation. It is necessary to consider the effect of rotor bending deformation on joint interface stiffness characteristics and rotor system's vibration characteristics. A mechanical model for quantitatively describing the stiffness loss mechanism at the interface was proposed. For the dynamic design of discontinuous rotor system, the method for reduction of stiffness loss based on the strain energy distribution optimization was proposed. The numerical simulation results show that for large-span discontinuous rotor system, the stiffness loss is significant with bending deformation, which will greatly reduce the critical speed of the rotor. The sensitivity of rotor vibration characteristics to the stiffness loss can be controlled by optimizing the strain energy distribution of rotor. This method has important guiding significance for the optimal design of rotor vibration characteristics.