折叠翼无人机的空中投放装置设计

Design of Airdrop Mechanism for Folding-wing UAV

为满足小型折叠翼无人机空中投放发射的需求,设计了一种无人机空中投放装置,由投放筒、制动伞、投放机构及控制单元组成。投放装置自载机释放后进行自由落体运动,投放筒通过尾翼将自身角度调整并保持至投放准备姿态。根据无人机巡航的速度范围,控制单元延时释放无人机锁定机构,确保无人机出筒后具备适合的巡航速度。首先根据折叠翼无人机空中投放特点,提出了一种空中投放的设计方案;利用CATIA对装置进行建模;使用CFX和ANSYS分别求解流场和结构响应,得到投放筒下落过程中不同攻角条件下的速度与姿态变化的离散结果;使用Matlab将离散值拟合为高阶多项式;通过在Adams设置边界条件,进行投放筒下落过程速度及姿态变化过程的运动仿真。仿真结果证明,设计的空中投放装置能够实现折叠翼无人机的空中投放。

In order to meet the needs of small folding-wing UAV for aerial launch, a UAV aerial launch device is designed. It consists of a launcher, a braking parachute, a launching mechanism and a control system. After theaerial device is released from the carrier, it performs free fall. The launcher enters and maintains a stable delivery posture. According to the cruising speed range of UAV, the control system delay release UAV to ensure that the UAV can enter the cruise state. According to the characteristics of the aerial launching, a design was proposed.By using CATIA, a three dimensional modeling of the device was built. The CFX and ANSYS were used to calculate the responses of flow field and structure. The discrete results of velocity and attitude caused by angle of attack were obtained. The discrete results were obtained by polynomial-fitting with MATLAB. The dynamics was analyzed with ADAMS. The simulation results show that the designed aerial launching device can realize the aerial launching of folding wing UAV.