Estimation of Acceleration Response of Freefall Lifeboat using FSI Analysis Technique of LS-DYNA Code

Abstract

During certification of freefall lifeboats, it is necessary to estimate the injury potential of the impact loads exerted on the occupants during water entry. This paper focused on the numerical simulation to predict the acceleration response during the impact of freefall lifeboats on the water using FSI(Fluid-Structure Interaction) analysis technique of LS-DYNA code. FSI problems could be conveniently simulated by the overlapping capability using Arbitrary Lagrangian Eulerian(ALE) formulation and Euler-Lagrange coupling algorithm of LS-DYNA code. Through this study, it could be found that simulation results were in relatively good agreement with experimental ones in the acceleration peak values, and that the loading conditions were very sensitive to the acceleration responses by the experimental and simulation results.

Comparisons of Multi Material ALE and Single Material ALE in LS-DYNA for Estimation of Acceleration Response of Free-fall Lifeboat

“…The single material ALE approach was applied to the prediction of the acceleration response of free-fall lifeboat (Bae et al, 2010). In this paper, the Multi Material ALE method was adopted for the same FSI problem and its responses were compared to those of the single-material ALE one.…”

Performance on the drop impact test of the cone capsule shaped portable tsunami lifeboat using penalty method contact analysis

“…The infl uence of falling height and skid angle on the free-fall lifeboat launching behavior in regular waves has been investigated by Karim,[10], [11]. Bae have study on the acceleration response of freefall lifeboat using FSI Analysis, [12], [13].Shibata, [14], used the moving particle semi-implicit to estimate the acceleration response of free-fall lifeboat at the water entry stage. It was found that the reduction of the displacement increased the acceleration response.…”