【作者】 许杰；

【导师】 童明波；

【作者基本信息】 南京航空航天大学 ， 飞行器设计， 2007， 硕士

【摘要】 随着我国经济建设和国防事业的发展,对于大型飞机的需求数量不断增加。由于大型飞机起飞、着陆重量都很大,在飞机着陆和滑跑过程中,起落架和飞机结构会受到很大的地面撞击载荷,这就要求起落架应具有良好的缓冲性能以减小着陆及高速滑跑时产生的撞击过载,迅速消散撞击能量使飞机的振动尽快衰减。采用一种具有自适应能力的特殊构造缓冲器,如使用双腔并及时增大油腔油液外流的通油孔面积,就可以抑制垂直载荷的迅速增大,把它控制在结构强度能接受的允许范围内。对于缓冲器的设计和动态性能分析,国内以往大多采用传统的方法,将起落架系统简化为二质量模型,并用编程方法实现求解。随着计算多体系统动力学和虚拟样机技术的出现,飞机及起落架着陆、滑跑动态响应的仿真模拟逐渐逼近现实。本文介绍了自适应缓冲器的数学模型和全机着陆、滑跑的动力学模型,利用动力学仿真软件ADAMS建立了起落架和全机的功能虚拟样机,进行了起落架和全机的着陆和滑跑仿真,并对结果进行了深入的分析和探讨,得出了一些有价值的结论,为我国今后大型飞机起落架设计提供了理论参考。更多还原

【Abstract】 With the development of economy and national defence projects, the number of large-scale aircrafts to be demanded is increased rapidly. Due to large touchdown weight of these aircrafts, the landing gear and airframe endure huge ground impact loads during landing and taxiing. So, it is extremly important to possess a suitable shock strut to reduce the over loading and to dissipate the vertical kinetic energy rapidly. A special adaptive shock strut with dual stage air chambers and metering pin bypass orifices is used to reduce airplane vertical acceleratior and achieve the improved landing and taxiing performance.In the former study of the shock strut design and dynamic analysis, the traditional method with a two-mass model was adopted and the results were calculated by the self-developed software. With the development of the computational multibody dynamics and virtual prototyping technology, the dynamic simulation of airplane and landing gear becomes gradually precise and approaches the reality. Therefore, this paper presented the mathematical model of the adaptive shock strut and the dynamic behavior model of the full-airplane during landing and taxiing. The digital landing gear and full-airplane assembly prototypings were established based on the large-scale dynamics software ADAMS. Then the symmetric landing of the landing gear and the taxiing simulation of the full-aircraft were performed. Furthermore, the results of the dynamic simulation were discussed and some valuable conclusions were given. This research lays the foundation for the further landing gear design of the large-scale airplane.更多还原