Prelimilary Design Of Absorbor System And Analysis Of Dynamic Performance For The Heavy Load Aircraft Landing Gear

Heavy load aircraft is integration of modern high-tech. Conception and layout design is the core and key to improving the performance of landing gear. According to the assignments, the general layout and weight characteristics of aircraft, etc, firstly this scientific dissertation estimates the center of gravity of the heavy load aircraft. Then by request of ground stability, maneuverability and positioning method of landing gear, schemes and layout design of heavy load aircraft are carried out, including installation location of landing gear, wheels/tires selection, design and optimization of absorber system. Tire load distribution scheme of multi-wheel landing gear is also analyzed.It is an significant component part that strength and stiffness design of aircraft researches into loads of landing gear and airframe. During the scheme design stage, ground operation loads of landing gear can be analyzed and calculated on the basis of specification requirement, involving processes of landing, sliding, braking, turning, front wheel cornering and revolving. Then the mechanical analysis models and dynamic equation of landing and taxiing of heavy load aircraft are illustrated detailedly. The catia airframe model is transformed into Adams depending on software-SimDesigner. Finally dynamic response analysises regarding landing and taxiing are conducted in the environment of Adams/Aircraft, in which full machine assembly model is completed.The simulation results show that absorber maximum stroke, peak overload and amount of absorbed energy during positive stroke are consistent with theoretical calculations. Landing gear with multi-wheels and multi-struts can effectively distribute loads of airframe and landing gear. Maximum load emerges from taxiing process can exceed that of landing. Landing gear with dual-chamber absorber which is previously designed can significantly improve the impact properties of heavy load aircraft on the rough pavement, and reduce loading of landing gear. The applied Landing gear conception can adapt demands of lifting off and landing on a relatively short unpaved runway.