skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Design for Manufacturing for Energy Absorption Systems

Abstract

In the typical scenario of a helicopter crash, impact with the ground is preceded by a substantially vertical drop, with the result that a seated occupant of a helicopter experiences high spinal loads and pelvic deceleration during such crash due to the sudden arresting of vertical downward motion. It has long been recognized that spinal injuries to occupants of helicopters in such crash scenario can be minimized by seat arrangements which limit the deceleration to which the seated occupant is subjected, relative to the helicopter, to a predetermined maximum, by allowing downward movement of the seated occupant relative to the helicopter, at the time of impact with the ground, under a restraining force which, over a limited range of such movement, is limited to a predetermined maximum. In practice, significant benefits, in the way of reduced injuries and reduced seriousness of injuries, can be afforded in this way in such crash situations even where the extent of such controlled vertical movement permitted by the crashworthy seat arrangement is quite limited. Important increase of accident safety is reached with the installation of crashworthy shock absorbers on the main landing gear, but this solution is mostly feasible on military helicopters with longmore » fixed landing gear. Seats can then give high contribution to survivability. Commonly, an energy absorber is a constant load device, if one excludes an initial elastic part of the load-stroke curve. On helicopter seats, this behavior is obtained by plastic deformation of a metal component or scraping of material. In the present work the authors have studied three absorption systems, which differ in relation to their shape, their working conditions and their constructive materials. All the combinations have been analyzed for applications in VIP helicopter seats.« less

Authors:
; ; ;  [1]
  1. Department of Engineering for Innovation, University of Salento, Via per Arnesano, Building 'O', Lecce (Italy)
Publication Date:
OSTI Identifier:
21516736
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1353; Journal Issue: 1; Conference: ESAFORM 2011: 14. international ESAFORM conference on material forming, Belfast, Northern Ireland (United Kingdom), 27-29 Apr 2011; Other Information: DOI: 10.1063/1.3589748; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCELERATION; DESIGN; ELASTICITY; ENERGY ABSORPTION; EQUIPMENT; HELICOPTERS; INJURIES; MANUFACTURING; MATERIALS; MATHEMATICAL SOLUTIONS; PLASTICITY; SHOCK ABSORBERS; SHOCK WAVES; WORKING CONDITIONS; ABSORPTION; AIRCRAFT; DISEASES; MECHANICAL PROPERTIES; SORPTION

Citation Formats

Del Prete, A., Primo, T., Papadia, G., and Manisi, B. Design for Manufacturing for Energy Absorption Systems. United States: N. p., 2011. Web. doi:10.1063/1.3589748.
Del Prete, A., Primo, T., Papadia, G., & Manisi, B. Design for Manufacturing for Energy Absorption Systems. United States. doi:10.1063/1.3589748.
Del Prete, A., Primo, T., Papadia, G., and Manisi, B. Wed . "Design for Manufacturing for Energy Absorption Systems". United States. doi:10.1063/1.3589748.
@article{osti_21516736,
title = {Design for Manufacturing for Energy Absorption Systems},
author = {Del Prete, A. and Primo, T. and Papadia, G. and Manisi, B.},
abstractNote = {In the typical scenario of a helicopter crash, impact with the ground is preceded by a substantially vertical drop, with the result that a seated occupant of a helicopter experiences high spinal loads and pelvic deceleration during such crash due to the sudden arresting of vertical downward motion. It has long been recognized that spinal injuries to occupants of helicopters in such crash scenario can be minimized by seat arrangements which limit the deceleration to which the seated occupant is subjected, relative to the helicopter, to a predetermined maximum, by allowing downward movement of the seated occupant relative to the helicopter, at the time of impact with the ground, under a restraining force which, over a limited range of such movement, is limited to a predetermined maximum. In practice, significant benefits, in the way of reduced injuries and reduced seriousness of injuries, can be afforded in this way in such crash situations even where the extent of such controlled vertical movement permitted by the crashworthy seat arrangement is quite limited. Important increase of accident safety is reached with the installation of crashworthy shock absorbers on the main landing gear, but this solution is mostly feasible on military helicopters with long fixed landing gear. Seats can then give high contribution to survivability. Commonly, an energy absorber is a constant load device, if one excludes an initial elastic part of the load-stroke curve. On helicopter seats, this behavior is obtained by plastic deformation of a metal component or scraping of material. In the present work the authors have studied three absorption systems, which differ in relation to their shape, their working conditions and their constructive materials. All the combinations have been analyzed for applications in VIP helicopter seats.},
doi = {10.1063/1.3589748},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1353,
place = {United States},
year = {Wed May 04 00:00:00 EDT 2011},
month = {Wed May 04 00:00:00 EDT 2011}
}