无人机气压弹射起飞动力学仿真分析

Dynamic Simulation and Analysis on Pneumatic Catapult-assisted Take-off of UAV

基于气压弹射装置的工作原理,建立弹射过程的动力学模型,针对影响弹射起飞的4个关键参数(充气压力、发射角、储气瓶容积和活塞直径)进行了数值仿真计算和分析,分析结果表明,给定无人机和滑车质量时,充气压力和气缸活塞直径对发射加速过程影响显著,发射角和储气瓶容积的改变对发射初始过程影响极小。最终将仿真结果和试验数据进行比对,验证了动力学模型的正确性,对气压弹射装置的研制设计具有重要的参考价值和工程意义。

The dynamic models of catapult-assisted take-off(C.A.T.O.)are built on the basis of the principle of pneumatic catapult.Four key parameters which includes charge pressure,launch angle,the cylinder volume and piston diameter are investigated into the simulation.The analysis indicates that charge pressure and piston diameter have a deep effect on the takeoff velocity,launch angle and the cylinder volume affect it lightly when the mass of UAV and the shuttle is certain.Finally,the simulation results are compared with experiment results,which proves the correctness of the dynamic models,and also provides an important theoretical value and engineering significance.