旋转牵引式降落伞弹射系统动力学仿真与分析

Dynamics Simulation and Analysis of Rotating Traction Parachute Ejection System

为了缩短降落伞开伞时间,对无人机降落伞弹射系统进行了研究。通过高速旋转方式,采用牵引球将降落伞伞口牵引开,增大伞口初始面积,加速气流进入伞内。使用Solidworks进行三维建模后,导入Adams进行运动学仿真,对仿真结果进行分析。结果发现,牵引球在弹射出仓后做斜抛运动,在4个方位散开,其运动方式和运动轨迹符合设想。结果表明:增大电机转速可以增大牵引球在水平方向的速度和位移,增大弹簧刚性系数可以增大牵引球在竖直方向上的速度和位移;理想状态下,最佳电机转速为2 000°/s,弹簧刚度系数为80 N/m;与以往系统相比,该无人机回收伞降系统开伞时间仅为1.403 3 s,开伞用时至少缩短了0.5 s。

In order to shorten the time of parachute opening,the ejecting dynamics of the UAV parachute ejection system is studied.By means of high-speed rotation,a traction ball is used to pull the parachute opening to increase the initial area of the opening and accelerate more airflow into the parachute.After building the 3D model of parachute ejection system using Solidworks,it was imported into Adams for kinematics simulation,and the simulation results were analyzed.The results show that the traction ball does oblique throw after ejection and spreads out in four directions.And increasing the motor speed can increase the velocity and displacement of the traction ball in the horizontal direction,and increasing the spring stiffness coefficient can also increase the stiffness and displacement of the traction ball in the vertical direction.Under the ideal condition,the optimal motor speed is 2000°/s,and the spring stiffness coefficient is 80 N/m.Compared with the previous ejection system,the opening time of the UAV recovery parachute drop system is only 1.4033 s and shortened by at least 0.5 s.