Investigation of Vehicle Ingress and Egress: Correlating Vehicle Geometry to Subject Ratings

This study was conducted to investigate the effects of vehicle doorway geometry, including rocker-panel height to heel surface, rocker-panel width, seat-to-ground distance, and door-pivot mechanisms on driver perception of ease or difficulty of ingress and egress. In addition, two methodologies were investigated for use in ingress/egress studies. Five subpopulations of subjects, whose age and physical characteristics were considered to have a possible influence on perception of the ease of ingress/egress, were tested using both Ratings and Paired Comparisons procedures for assessing ease of ingress and egress. Rocker-panel height and width, and seat-to-ground distance were varied over ranges spanning current production vehicle dimensions. Testing was conducted using an adjustable laboratory buck and primarily for constrained door-opening conditions, similar to door-openings allowed in typical parking lots. Door hinge characteristics were varied to explore the possible advantages of a four-bar hinge mechanism under these constrained conditions. The test facility was instrumented to measure forces exerted by subjects on the ground, seat, and steering wheel during both ingress and egress trials. Analysis of the test data show that: (1) Ratings and Paired Comparisons methods are both viable for use in ingress/egress testing; (2) egress is perceived to be more difficult than ingress across conditions; (3) rocker width and seat-to-ground distance have an important influence on perception of the ease of ingress/egress; (4) door-hinge influenced subject ratings of ingress and egress, but the four-bar hinge conditions were generally rated as more difficult than the production-hinge condition; (5) subject groups differ in their overall rating of ease of ingress and egress, with elderly subjects reporting greater difficulty across all conditions; (6) the effect of rocker width and seat-to-ground distance on rating difficulty of ingress and egress varies for different subject groups; (7) subject ratings were repeatable within and across sessions; (8) seat-to-ground distance has an important influence on subject ratings; (9) subjects rarely judged conditions to be unacceptably difficult; and (10) parameters of the force-time histories were significantly affected by vehicle variables, but they were not closely related to difficulty ratings.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 85p

Subject/Index Terms

Filing Info

  • Accession Number: 01495389
  • Record Type: Publication
  • Report/Paper Numbers: UMTRI-97-49
  • Contract Numbers: 391786
  • Files: TRIS
  • Created Date: Oct 11 2013 10:40AM