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介绍了基于蓄能器、液压马达驱动无人机(UAV)发射的气液压弹射系统,建立了系统各主要部分的数学模型。基于AMESim仿真软件搭建了弹射系统的仿真计算模型,评估了动摩擦力对无人机末端弹射速度的影响,拟合出末端弹射速度-动摩擦力曲线。在试验样机上对动摩擦力进行测试,得出设备的动摩擦力和动摩擦系数。研究表明,设备的动摩擦系数会因发射角度的增大而降低,影响无人机的最终发射速度,进而影响到弹射成功率。为后续弹射系统的仿真、试验和优化提供了参考。
The gas-hydraulic ejecting system based on accumulator and hydraulic motor driven unmanned aerial vehicle (UAV) is introduced, and the mathematical models of the main parts of the system are established. Based on AMESim simulation software, the simulation calculation model of catapult system is built to evaluate the effect of dynamic friction on the ejection velocity of the UAV, and the curve of the final ejection velocity-dynamic friction is fitted. In the test prototype on the dynamic friction test, draw the equipment dynamic friction and dynamic friction coefficient. The research shows that the dynamic friction coefficient of the equipment will decrease due to the increase of the launch angle, which will affect the final launch speed of the UAV and further affect the success rate of the launch. It provides a reference for the simulation, experiment and optimization of subsequent ejection system.