降落伞空投试验多模式开伞控制系统设计与实现

Design and Implementation of Multi-mode Parachute Opening Control System for Airdrop Test

开伞动压是考核降落伞强度的重要设计指标,为了在空投试验中进行降落伞性能的考核,设计了具备动压测量判断和时间控制两种模式的降落伞开伞控制系统,系统采用了动压测量控制方法和基于蒙特卡洛的时间控制相结合的冗余控制方法。通过计算分析和相关空投试验验证,动压测量控制方法与时间控制方法相比,开伞动压控制精度由±90Pa提高到±25Pa;基于蒙特卡洛方法的开伞时间控制能够有20%的概率使开伞时刻的动压达到开伞目标动压值。通过该系统的应用使降落伞开伞时动压尽可能接近考核目标动压,实现了降落伞开伞动压精确控制,达到了准确考核降落伞性能、验证降落伞设计裕度的目的,提高了空投试验中降落伞开伞条件控制的准确度,为后续相关试验提供了一种技术思路。

The Parachute opening dynamic pressure is an important design index for evaluating parachute strength.Based on the index evaluation method of parachute performance in airdrop test,a parachute opening control system with two modes which dynamic pressure judgment and time control were designed to make the parachute opening dynamic pressure as close as possible to the evaluation target dynamic pressure,realize accurate control of parachute opening dynamic pressure,evaluate parachute performance and analyze parachute opening dynamic margin.A multi-mode parachute opening control system combining dynamic pressure measurement and time control were designed.The system adopts a redundant control method combining dynamic pressure measurement control method and time control based on Monte Carlo.Through calculation and analysis and related air drop test verification,the dynamic pressure control accuracy of parachute opening is improved form 90Pa to 25Pa,compared with the time control method.The opening time control based on Monte Carlo method can make the dynamic pressure at opening time reach the target dynamic pressure value with a 20%probability.It effectively improves the simulation environment of parachute working conditions in airdrop test,and provides a technical idea for subsequent related test.The working composition,working principle and application effect of parachute deploying control system with atmospheric data measurement system were introduced in this paper.