弹性机体起落架的动态性能仿真分析

Dynamic Response Simulation and Analysis of Landing Gear with Flexible Fuselage

通过建立弹性机体的等效模型,导出了系统的运动微分方程;并在ADAMS/Aircraft环境中建立了虚拟样机,仿真出具有弹性机体的飞机着陆时的动态响应。仿真结果显示出弹性机体能起到吸收和耗散能量的作用,吸收了缓冲器功量的6.5%,并可以适当减轻着陆时的侧滑过载。对考虑弹性机体起落架系统进行了研究分析,得出机体的低阶弹性模态起到提高飞机起落架缓冲器效率的作用。该设计方法能够减小轮胎和缓冲器的受载,延长起落架寿命。此外,对传统起落架缓冲器设计准则进行了完善。

The dynamics differential equations of the airplane system with flexible fuselage are deduced based on the establishment of equivalent model. An aircraft model with flexible fuselage using virtual prototype is applied based on the mathematical models of the whole system in ADAMS/Aircraft version. A series of simulations of dynamics responses are analyzed. Simulation results show the importance of considering the influence of flexible body in the design of landing gear. Flexible fuselage is able to contribute to absorbing 6.5% energy of shock absorber and alleviating overload during landing appropriately. It plays a role in absorbing and dissipation energy, Via research and analysis of the landing gear system with flexible body, the conclusion is got that the efficiency of shock absorber depends on the low order elastic modes to a great extent. Decreasing the burdens on tires and shock absorber, and utilizing the influence of flexible fuselage prolongs the life of landing gear, It perfects the design criteria of shock absorber commonly used.