高速转子连接结构刚度损失及振动特性

高负荷航空发动机转子的转速和支点跨度不断加大，使得转子弯曲刚度下降，并在工作中具有一定弯曲变形。转子弯曲变形时，连接界面会存在刚度损失，需考虑转子弯曲变形对连接界面刚度特性及转子系统振动特性的影响。提出了定量描述连接界面刚度损失的力学模型，并针对非连续转子系统的动力学设计，提出了基于应变能分布优化的连接结构刚度损失抑制方法。数值仿真结果表明:转子弯曲变形下，连接界面刚度损失显著，会使转子弯曲临界转速大幅降低；通过转子应变能分布优化设计可有效降低连接界面刚度损失对转子系统振动特性的影响，对转子系统振动特性优化设计具有重要的指导意义。 

Joint stiffness loss and vibration characteristics of high-speed rotor

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.