下单翼飞机主起落架舱补强结构设计与分析

Reinforcement Design and Analysis of Main Landing Gear BAY for Low-Wing Aircraft

主起落架舱(以下简称主起舱)位于主起落架所在的机身腹部翼身开口处,该区域连接结构复杂,是飞机外部载荷、应力集中、疲劳问题最为严重的区域,是机身载荷传递实现平衡的必经区域。主起舱的补强与一般机身开口补强不同,一方面要能够有效缓解开口应力集中,另一方面要参与外翼、主起落架与机身之间的传力以降低周围结构应力。补强结构设计的好坏直接影响翼身传力和主承力结构设计,通过主起舱补强结构进行力学和有限元对比,分析说明下单翼飞机主起舱补强方案。

The Main Landing Gear Bay （ MLGB） lies in the belly of the fuselage wing body main landing gear opening. The structure of the area is complex, where the problem of external load,stress concentration, fatigue is the most serious,and where the body load transfer realizes the aim of regional balance. The MLGB compartment of the reinforcement is different from general body opening reinforcement. The one hand,the MLGB compartment of the reinforcement will be able to effectively alleviate the opening stress concentration, on the other hand, it will take part in the force among the main wing,landing gear and fuselage structure to reduce the surrounding stress. A good reinforcement option directly influences the wing body force and the main bearing structure design. The article based on force and finite element analysis discusses the reinforcement options of low-wing aircraft MLGB.