折叠翼无人机冷气发射装置动态特性分析及优化

针对冷气投放装置工作过程中存在的机械系统和气压系统耦合非线性动力学问题，提出了一种满足折叠翼无人机（UAV）结构形式和空中发射技术要求的冷气发射动态特性分析方法及优化设计方法。以某型折叠翼无人机为研究对象，基于联合仿真建立了无人机气动发射系统动力学模型，搭建了冷气发射系统试验样机，并完成压缩气体空中发射试验，验证了仿真模型的准确性。在此基础上，分析了无人机与冷气发射装置主要系统参数对无人机发射动态性能的影响，针对该系统进行了参数优化设计。结果表明:储气瓶体积和充气压力是影响无人机冷气发射动态特性的关键参数，随着储气瓶体积和充气压力增大，最大发射速度和加速度明显增大，储气瓶体积从15 L增加至30 L，最大发射速度增加了52.7%，最大发射加速度增长了60.9%呈正相关影响；充气压力从0.4 MPa增加至0.7 MPa，最大发射速度增长了50.5%，最大发射加速度增长了69.9%；发射角度对无人机发射性能影响较小，可忽略不计。 

Analysis and optimization of dynamic characteristics of air-cooled launcher for fold-rotor UAV

In order to solve the coupling nonlinear dynamics problem of the mechanical system and pneumatic system in the process of a new air-cooled launch device, an analysis method and optimization design method for the air-cooled launching dynamic characteristics of folding-rotor unmanned aerial vehicle (UAV) were proposed to satisfy the requirements of its structural form and launching technology. Taking a folding-rotor UAV as the research object, the dynamics model of the compressed gas launch system of UAV was established based on co-simulation, and the test prototype of the cold air launch system was built, the compressed gas launch experiment was completed to verify the accuracy of the simulation model. The effect of the main system parameters of UAV and air-cooled launcher on the dynamic performance of UAV launch is analyzed. Finally, the parameter optimization design is carried out for the system. Results show that the volume of the air cylinder and the inflation pressure are the key parameters influencing the dynamic characteristics of the UAV air conditioning launch, with air cylinder volume and air pressure, the largest launch speed and overload increasing, air cylinder volume increased from 15 L to 30 L, the largest launch speed increased by 52.7%, the largest launch overload grew by 60.9%, were positively correlated; When the charging pressure increases from 0.4 MPa to 0.7 MPa, the maximum launch velocity increases by 50.5% and the maximum launch overload increases by 69.9%. The launch angle has little effect on UAV launch performance and can be ignored.