民用飞机发动机吊挂应急断离设计研究

发动机吊挂应急断离是民用飞机设计的关键核心技术之一，国外相关技术难以获取，国内以理论研究和提出主要思路为主，与工程实现存在差距。基于此，从适航标准入手，研究吊挂、保险销和机翼三者的应急断离设计载荷大小的关系，通过场景分析，研究界面结构强度计算的载荷确定方法。结果表明：吊挂应急断离设计仅需单独考虑发动机主载荷向上或主载荷向后工况，合理给定吊挂、保险销和机翼结构三者的应急断离设计载荷大小关系可有效降低结构重量；机翼/吊挂界面载荷方向则必须结合结构细节做具体的应急断离场景分析。

Study on Engine Pylon Separation Design of Civil Aircraft

Engine pylon separation is one of the key technologies in civil aircraft design, which is difficult to obtain from abroad. Domestic researches are mainly about theories and thoughts, which cannot be applied on engineering. In this paper, the relationship of design loads among pylon, fuse pin and wingbox is carried out based on airworthiness standards. Load determination methods for strength calculation of interface structures is proposed through scenario analysis. The results show that the engine pylon separation design only needs to consider predominantly upward loads and predominantly aft loads separately. Giving reasonable relationship of design loads among pylon, fuse pin and wingbox can reduce the weight of structures. Load directions of components connecting the pylon to the wing should be determined through scenario analysis considering structural details.