A revised numerical model for parachute inflation based on ALE method

Abstract

The parachute inflation process is a typical time-varying, non-linear and fluid-structure coupling problem, especially inairdrop condition. For its complexity, numerical model of the inflation process is a big challenge, and most of the modelsestablished before still have room for improvement. There were two common problems that the first one was ignoranceof inertia force of canopy and line, and the second was that took stretch speed as the initial airdrop speed in modelling.Thus, a modified finite element model for canopy inflation process based on ALE (Arbitrary Lagrange Euler) method wasestablished that the inertia force of canopy and line was taken into consideration and the initial airdrop speed wasestimated and adjusted. The opening load in finite mass situation during deployment-inflation process of C-9 typeparachute was calculated. The result was compared to experimental data and calculated data of unmodified models. Itwas indicated that the opening load and peak time of modified model was the closest to experiment and the snatch loadwas also calculated and confirmed, so that the correctness and rationality of the model was verified. Then the factorinfluence of inertia force and initial airdrop speed was analysed, which provided a reference for parachute numericalmodelling.

Fluid-structure Interaction Study on Drag Characteristics of Flexible Ribbon

“…The ALE method combines the benefits of both Lagrange and Euler methods, effectively preventing grid distortion and providing significant advantages in handling flexible large deformation objects. The ALE method has also been widely used in studying the flexible parachute inflation process [10][11][12][13][14][15] . This paper utilizes the ALE method to tackle the fluid-structure interaction process of a flexible ribbon.…”

Modeling and research of a multi-stage parachute system for the booster recovery

“…Dobrokhodov 25 gave a dynamics model of a 6-DOF parachute-payload system for accurate air-drop by adding the control rate model of the parachute to the simulation program. Zhu and Chen 26,27 et al established a 5-DOF dynamic model of the parachute-bomb system in the vertical plane in line with the Lagrange mechanics method.…”