转子连接结构力学特性稳健设计

Robust Design of Mechanical Characteristics of Rotor Connection Structure

针对航空发动机转子结构具有质量/刚度分布不均匀、界面连接和承受大弯曲载荷等结构力学特性,分析了转子连接结构力学特性与界面接触状态之间的关联性,提出适用于工程设计的连接界面滑移和摩擦-疲劳损伤程度的界面接触状态、应变能和摩擦功等定量评估参数。建立了基于连接界面变形协调和转子应变能分布控制的转子连接结构力学特性稳健设计方法。结果表明:通过对转子结构几何特征参数进行优化,提高了连接界面在离心载荷作用下的变形协调性,改善了在工作载荷下转子弯曲应变能分布,可以减少连接界面摩擦-疲劳损伤,从而降低连接结构力学特性对载荷环境的敏感度,保证转子结构力学特性稳健。以高速转子系统中连接结构为例,通过仿真计算验证了带有界面连接的转子连接结构力学特性稳健设计的有效性。

Aiming at the structural mechanical characteristics of aeroengine rotor structure such as uneven mass/stiffness distribution,interface connection and bearing large bending loads,the correlation between the mechanical characteristics of the rotor connection struc⁃ture and the interface contact state was analyzed,and the quantitative evaluation methods of interface contact state,strain energy and fric⁃tion work were put forward for engineering design,such as interface slip and friction fatigue damage degree parameters.A robust design method for the mechanical properties of the rotor connection structure based on the coordination of the deformation of the connection inter⁃face and the control of the distribution of the rotor strain energy was established.The results show that by optimizing the geometric charac⁃teristic parameters of the rotor structure,the deformation coordination of the connection interface under the action of centrifugal load is im⁃proved,and the bending strain energy distribution of the rotor under the working load environment can be adjusted to reduce the friction-fa⁃tigue damage of the connection interface,thereby reducing the mechanics of the connection structure.The sensitivity of the characteristics to the load environment ensures the robust mechanical characteristics of the rotor structure.Taking the connection structure in the highspeed rotor system as an example,the effectiveness of the robust design of the mechanical characteristics of the rotor connection structure with interface connections is verified by simulation calculation.