盘鼓组合结构的结合面非线性接触特性及其装配稳定性研究

盘鼓组合结构是航空发动机中典型的转子连接结构形式，其结合面的非线性接触特性所带来的装配稳定性问题制约着我国航空发动机装配水平的提升。因此，本项目提出了盘鼓组合结构的非线性接触特性及其装配稳定性的研究，通过研究高阶多项式函数的结合面真实表面形貌建模方法，反映尺寸测量阶段零部件的制造误差特征；通过研究边界约束与非理想接触耦合下的结合面连接刚度折损机理，反映止口贴合阶段非线性接触应力的来源；通过研究表面形貌匹配驱动下的结合面局部变形机理与装配精度演化规律，反映螺栓逐个拧紧阶段结合面的非线性变形协调关系；通过研究结合面连接刚度折损机理下的盘鼓组合结构同心度退化规律，反映服役阶段装配稳定性的产生机理；通过开发基于表面形貌匹配与装配工艺优化的盘鼓组合结构装配稳定性调控方法，应用于某型号航空发动机高压涡轮的装配工艺中，提其在装配与试车过程中的一次合格率，从而为解决其装配稳定性问题提供理论指导和技术支持。

The disk drum joint is a typical joint in the aircraft engine, and its nonlinear contact behavior has significant effect on assembly stability, which is the key of aircraft engine industry in China. Therefore, the research on the nonlinear contact behavior and assembly stability of drum-disc joint is proposed. In order to reflect the manufacturing error in the dimension measurement stage, the real surface modeling method of the contact surface with high-order function is studied. Based on the contact stiffness loss under the boundary constraint and non-ideal contact, the source of nonlinear contact stress in the stage of joining is carried out. By studying the local deformation and the assembly accuracy of the contact surface driven by the surface morphology matching, the nonlinear deformation interaction of the contact surface in the bolt tightening stage is studied. Based on the study of the concentricity of drum-disc joint under the reduced contact stiffness, the assembly stability in the working stage is carried out. Through the development of the assembly stability control method, it is used in the assembly of a type of aircraft engine high pressure turbine, which could increase the first acceptable rate and provide theoretical guidance and technical support for solving the assembly stability problem.