破损安全设计在民用飞机襟翼运动机构中的应用

Application offail-safe design in flap mechanism of civil aircraft

后缘襟翼是现代民用飞机的关键增升装置,运动机构是其重要的支撑结构。根据后缘襟翼运动机构特点和损伤容限要求,提出了破损安全设计要求和不同类型的破损安全结构应用场景。基于裂纹扩展方法和主、副结构裂纹独立扩展的原则,给出了不同类型破损安全结构的裂纹扩展曲线、检查门槛值和重复检查间隔的确定方法;针对主流铰链襟翼和滑轨襟翼运动机构的传力和连接特点,从主、副结构的相对位置出发提出了同位结构和异位结构的分类方式,从结构特点出发提出了平板结构和铰链结构的分类方式,给出运动机构破损安全设计流程,并提出了典型富勒襟翼滑轨等待破损安全最小设计间隙确定方法,对民用飞机的研制具有重要意义。

Trailing edge flaps are critical high-lift devices for modern airliner and mechanisms are the most important structural supports. Based on structures and damage tolerance, the requirements and usage scenarios of fail-safe design for flap mechanisms are provided. Based on the crack growth method and the principle of independent crack growth of primary and secondary structures, the crack growth curve, inspection threshold and repeated inspection interval of different types of fail-safe structures are determined. According to the connection characteristics of hinged flap and sliding track flap, the classification method of the same-placed structure and the different-placed structure are proposed from the relative positions of the primary structure and the secondary structure, and the classification method of the plate structure and hinge structure are proposed based on the structure characteristics. The minimum installation clearance design methodology is given, which is of great significance to the development of civil aircraft.