关键词: 复合材料, 滑撬式起落架, 弓形梁, 截面设计, 过载

Abstract: This paper established finite element model of landing gear skids according to the approximate requirement of a certain Mini-UAV (unmanned aerial vehicle). The airframe was simplified as a mass point. Then, by conducting the dynamic simulation of UAV landing process, from which a series of simulation results such as the attenuated trend of UAV′s velocity, the acceleration of UAV could be calculated. For the sake of lowering the acceleration of UAV whthin a safety range, the sectional dimension of arched beams and filament winding angles were required to optimizate to meet the demands. Then, by using Tsai-Wu failure criterion to check the strength of arched beams, an appropriate arched beams structure and optimal filament winding angles were designed and obtained, which minimize the value of acceleration of UAV without structure failure. Besides, we attempte to use different kinds of fiber composites to further improve the vibration resistance of landing gear skids. Simulation results indicate that reasonable sectional dimension of arched beams could improve vibration resistance of landing gear skids. The optimal filament winding angles were(45°/-45°/90°/-90°/45°/-45°)which lowered Tsai-Wu failure indice. Meanwhile, the landing gear skids made of aramid fiber composites possessed greater vibration resistance than that made of by carbon fiber composites. The research results had a vital directive meanling on the design and manufacture of UAV landing gear skids.

Key words: composite material, landing gear skids, arched beams, sectional dimension design, acceleration