Railway seat design for injury mitigation in crash scenario

Research output: Contribution to journalArticle

Abstract

A validated framework developed to analyse railway occupant safety is presented here. The inexistence of restraints and the larger distance between contact features for the railway cabin interior decreases the predictability on the kinematics of its occupants. Simulation results are evaluated considering the severity of the injuries, assessed and quantified using the relevant criteria. It was introduced a head padding that conducted to a reduction of the Head Injury Criterion (HIC) but worsening the value of neck-bending moment in extension (NBME). Finally, the multi-objective optimization procedures are applied to achieve a relevant reduction in injuries. With the implementation of a pad with 42 mm thickness and with a reduction of 8.2% of the backseat plate thickness, is obtained a 41% reduction of the HIC but at the cost of an increase of 49% of the NBME index, though this design allows keeping all injury indices below moderate threshold value.

Original languageEnglish
JournalInternational Journal of Rail Transportation
DOIs
Publication statusPublished - 1 Jun 2019

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Seats
German Federal Railways
scenario
Bending moments
Multiobjective optimization
contact
Kinematics
simulation

Keywords

  • impact biomechanics
  • Railway crashworthiness
  • secondary collision

Cite this

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title = "Railway seat design for injury mitigation in crash scenario",
abstract = "A validated framework developed to analyse railway occupant safety is presented here. The inexistence of restraints and the larger distance between contact features for the railway cabin interior decreases the predictability on the kinematics of its occupants. Simulation results are evaluated considering the severity of the injuries, assessed and quantified using the relevant criteria. It was introduced a head padding that conducted to a reduction of the Head Injury Criterion (HIC) but worsening the value of neck-bending moment in extension (NBME). Finally, the multi-objective optimization procedures are applied to achieve a relevant reduction in injuries. With the implementation of a pad with 42 mm thickness and with a reduction of 8.2{\%} of the backseat plate thickness, is obtained a 41{\%} reduction of the HIC but at the cost of an increase of 49{\%} of the NBME index, though this design allows keeping all injury indices below moderate threshold value.",
keywords = "impact biomechanics, Railway crashworthiness, secondary collision",
author = "Carvalho, {M. S.} and Martins, {A. P.} and J. Milho",
note = "This work was supported by the Fundacao para a Ciencia e a Tecnologia [UID/EMS/00667/2019, UID/EMS/50022/2019];",
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AB - A validated framework developed to analyse railway occupant safety is presented here. The inexistence of restraints and the larger distance between contact features for the railway cabin interior decreases the predictability on the kinematics of its occupants. Simulation results are evaluated considering the severity of the injuries, assessed and quantified using the relevant criteria. It was introduced a head padding that conducted to a reduction of the Head Injury Criterion (HIC) but worsening the value of neck-bending moment in extension (NBME). Finally, the multi-objective optimization procedures are applied to achieve a relevant reduction in injuries. With the implementation of a pad with 42 mm thickness and with a reduction of 8.2% of the backseat plate thickness, is obtained a 41% reduction of the HIC but at the cost of an increase of 49% of the NBME index, though this design allows keeping all injury indices below moderate threshold value.

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