Study On Dynamics And Stability Of Parachute-object Coupling System

This paper focuses on the development needs of airdrop equipment,starting from the lack of research results of object-parachute coupling dynamics and the major fundamental problems of parachute system in the development of defense weapons and equipment.In-depth theoretical research and analysis were carried out on the mathematical model of the whole process of airdrop,the modular universal numerical simulation platform,and the influence of atmospheric motion on airdrop.In this paper,the dynamic modeling method of the whole process of the parachute system is studied.The whole process of airdrop is divided into four stages: the in-cabin movement stage,the load out-going cabin,the main parachute straightening,the main parachute inflation and the stable landing.A mathematical model that is more in line with the real physical process than the traditional double-particle and three-degree-of-freedom models is proposed,and the five-degree-of-freedom kinematics and dynamic equations of the parachute-object system are derived.Combined with the inflation distance method,a mathematical model of parachute inflation and stable landing process was established.Based on MSC.Easy5,a universal platform for airdrop simulation is built.The user-friendly interface and post-processing software are designed with C# as the tool.A consistent modeling approach is provided for the entire process of the parachute system.The correctness and effectiveness of the algorithm are verified by comparison with the experimental data of the ejection seat ejection process.The results are closer to the experimental data than the traditional dynamic model.Based on the simulation platform,the atmospheric motion model was introduced,and the different parachute systems were simulated under different conditions.Through simulation and analysis,the influence law of the atmospheric environment on the trajectory of the parachute system is summarized,and in the comparison of the national military standard,the allowable range of wind speed is obtained.The theoretical basis for further improving the simulation precision is provided.