【作者】 陈志富；

【导师】 聂宏；

【作者基本信息】 南京航空航天大学 ， 飞行器设计， 2009， 硕士

【摘要】 具有可收放抗坠起落架的高性能直升机是新一代直升机的发展趋势,航空发达国家在这方面已经取得了巨大成功,一批先进的直升机已经投入使用。但国内在此领域的研究才刚刚起步,还属于航空业界的一个薄弱环节。本文基于这一现实,以串列式双腔油气缓冲器起落架为模型,综合考虑高性能直升机的使用环境和特点,对此展开系统研究。研究从高性能直升机的使用背景和使用特点出发,全面考察了双腔油气式缓冲器的受力情况,对全机力学模型和起落架力学模型进行了全面的数值分析;对直升机抗坠特性特别是起落架的抗坠特性进行了综合分析,在国内首次提出了在起落架上采用抗坠套管进行辅助抗坠的概念;此外,论文还对直升机起落架的“地面共振”特性和可抗坠起落架的收放实现问题进行了分析和探讨,给出了三种抗坠毁起落架实现收放的运动简图;在ADAMS/Aircraft中建立了摇臂式抗坠起落架的数字模型并进行了动力学仿真,仿真结果表明采用双腔油气式缓冲器的某型直升机起落架可以满足常规着陆和硬着陆的要求,结合机体和座椅的抗坠设置可以满足抗坠着陆的要求,当采用抗坠套管后有助于实现直升机在高速坠撞情况下的抗坠毁着陆要求。更多还原

【Abstract】 The advanced helicopter with retractable crashworthy landing gear is an inevitable tendency in the future. Tremendous achievements have been made in aviation well developed countries and some new generation advanced helicopters have been put into service. In our country, on one hand the research on advanced helicopter landing gear is a relative weak link; on the other hand abundance achievements have been made on fixed-wing-craft landing gear. Since there are some common features between landing gears of fixed-wing-craft and rotorcraft, many of the results are available for helicopter so as to accelerate the technical innovation and shorten the research periods. Based on these points both domestic and international experiences can be used for reference. Considering these situations the new generation helicopter landing gear is been investigated.According to the historical background and operating conditions, the force characteristics and crashworthy features of dual-chamber oleo-pneumatic shock absorber while landing are comprehensively investigated. The numerical analysis of the force act on the whole craft and landing gear is done and the ground resonance is analyzed. Then the notion that uses Crash Tube as an auxiliary crashworthy method is presented and the motion sketches are listed. Finally, a digital model is built and simulations are performed by commercial software ADAMS/Aircraft. The results from investigations and simulations show that the dual-chamber oleo-pneumatic shock absorber can meet the requirements of normal landing and hard landing; with the crash subfloor and crash seats, the landing gear is adaptable to crash landing and the overload factor is acceptable. The performance of crash landing can be obviously improved with Crash Tube (CT).更多还原