锥盘连接结构是一种典型的薄壁结构，其在螺栓群拧紧下的非均匀变形现象对涡扇发动机整机性能和可靠性有着显著的影响。针对该问题，本项目提出对其非均匀变形机理及其消减设计方法的研究。将影响非均匀变形的因素分为结构设计域和装配策略域两部分，分别研究变形的产生机理、变形的非均匀分布机理。通过研究多螺栓同步作用下考虑结合面实际表面形貌的锥盘连接结构变形规律，揭示结构设计域中变形的产生机理；通过研究螺栓群分批同步拧紧策略驱动下锥盘连接结构的变形分布规律，揭示装配策略域中变形的非均匀分布机理；继而，通过对影响变形不确定性的因素研究、结构设计域与装配策略域耦合关系的研究，提出非均匀变形的双域耦合优化模型，实现结构设计域和装配策略域的协同优化。开展锥盘连接结构模拟件双螺栓同步拧紧实验，验证该设计方法的有效性，为涡扇发动机低压涡轮轴装配提供重要的理论依据和工艺参考。

The Low pressure turbine(LPT) shaft of turbofan engine is a typical thin-walled structure， which has obviously effect of nonuniform deformation on the performance of the whole assembly. To solve this problem， this project presents a Double-zone nonuniform deformation reduction design toward to structure zone and assembly zone. Through building contact deformation model and considering surface topography, the cone-disk deformation model is improved. Through analyzing the relationships between deformation of cone-disk and constraint, size, shape, the generation mechanism and distribution regularities of deformation is studied, which can conclude the generation mechanism of deformation in the structure zone. Through analyzing the relationships between tighten strategy and deformation regularities, the transfer path of deformation is presented. And the coupling relationship of structure zone and assembly zone is studied after sensitivity analysis. Then, based on the analysis of uncertainty, the Double-zone nonuniform deformation reduction design of LPT is presented. At last, the experiment of synchronous tightening bolts using two axles is developed to verify above design, which can provide theory and technology for LPT shaft assembly.