0

Full Content is available to subscribers

Subscribe/Learn More  >

Improved Head Restraint Design for Safety and Compliance

[+] Author Affiliations
Matthew B. Parkinson

Pennsylvania State University, University Park, PA

Matthew P. Reed

University of Michigan Transportation Research Institute, Ann Arbor, MI

Paper No. DETC2006-99429, pp. 133-139; 7 pages
doi:10.1115/DETC2006-99429
From:
  • ASME 2006 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 1: 32nd Design Automation Conference, Parts A and B
  • Philadelphia, Pennsylvania, USA, September 10–13, 2006
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 0-7918-4255-X | eISBN: 0-7918-3784-X
  • Copyright © 2006 by ASME

abstract

The National Highway Traffic Safety Administration (NHTSA) recently revised Federal Motor Vehicle Safety Standard (FMVSS) 202, which governs head restraints. The new standard, known as FMVSS 202a, establishes for the first time in the U.S. a requirement for the fore-aft position of the head restraint. The fore-aft distance between the head restraint and headform representing a midsize male occupant must not exceed 55 mm when measured with the seat back angle set to 25 degrees. The goal of the rule change is to reduce the incidence of whiplash-associated disorders caused by rear impacts. Moving the head restraint closer to the head prior to impact decreases the amount of relative motion between the occupants’ heads and torsos and is believed to decrease the risk of soft-tissue neck injury. As manufacturers phase in seats that meet the new criterion, some vehicle models are producing complaints from drivers that the head restraint causes discomfort by interfering with their preferred head position, forcing them to select a more reclined seat back angle than they would prefer. To address this issue, an analysis of driver head locations relative to the seat was conducted using a new optimization-based framework for vehicle interior optimization. The approach uses simulations with thousands of virtual occupants to quantity distributions of postural variables of interest. In this case, the analysis showed that smaller-stature occupants are disproportionately likely to experience head-position interference from a head restraint that is rigidly affixed to the seat back. Using an analysis approach that considers both postural and anthropometric variability, design guidelines for the kinematics of an articulated head restraint are proposed. Such a restraint would provide optimal head restraint positioning across occupant sizes while minimizing interference.

Copyright © 2006 by ASME
Topics: Safety , Design

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In