ENERGY ABSORPTION MECHANISMS AND CRASH ANALYSIS OF HELICOPTER SEATS

Date

2018-11-15

Author

Öztürk, Gülce
Kayran, Altan

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In this paper, a crushable absorber system is designed to analyze the dynamic behavior and performance of a helicopter seat. The mechanism of the absorption system makes use of the crash energy to plastically deform the aluminum material of the seat legs. Seat structure is composed of a bucket, two legs and two sliding parts on each leg. Seat legs are made of aluminum and and the sliding parts of the seat are steel. During the impact event, the heavier sliding parts move down and crash the aluminum material for the purpose of deforming the aluminum material under the sliding parts and reduce the crash energy. The designed helicopter seat is analyzed using the explicit finite element method to evaluate how the seat energy absorbing mechanism works. Dynamic simulations are performed in ABAQUS by crashing the seat to a fixed rigid wall. To simulate the plastic deformation, true stress-strain curve of the aluminum material of the seat leg has been used. Time response results are filtered to calculate the meaningful g loads which incur damage to the occupants. Analyses are performed with and without the energy absorption mechanism in order to see the effectiveness of the energy absorption mechanism on the human survivability by comparing the g loads on the seat bucket with the acceptable loads specified by EASA. This study is a preliminary study intended to check the effectiveness of the damping mechanism based on the plastic deformation of the aluminum legs of the seat in the event of a crash.

URI

https://hdl.handle.net/11511/36930

DOI

https://doi.org/10.1115/imece2018-86220

Conference Name

ASMEInternational Mechanical Engineering Congress and Exposition (IMECE2018)

Collections

Department of Aerospace Engineering, Conference / Seminar

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Citation Formats

G. Öztürk and A. Kayran, “ENERGY ABSORPTION MECHANISMS AND CRASH ANALYSIS OF HELICOPTER SEATS,” presented at the ASMEInternational Mechanical Engineering Congress and Exposition (IMECE2018), Pittsburgh, PA, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36930.