Using Vehicle Dynamics Simulation and Meta-models to Understand Factors and Mechanisms Affecting Roll Angle: An Initial Assessment

A rollover is defined as any vehicle rotation of 90 degrees or more about any true longitudinal or lateral axis, according to the National Automotive Sampling System Crashworthiness Data System (NASS CDS). Rollover crashes are still represented highly in terms of frequency and fatalities among other crash categories. Even though there are various vehicular technical innovations that act as a preventative or protective improvement, rollover crashes and subsequent loss of life and injuries are still highly represented in crash statistics. In 2015, rollovers represented 33 percent of occupant fatalities. Existing research on rollover as it relates to highway safety is often based on crash data analysis. Limited studies have investigated the initiating mechanisms contributing to vehicular propensity to rollover. Hence, there is a gap in knowledge to understand initiation factors that affect rollover events. Vehicle dynamics simulations (not crash data) were utilized to create several vehicle rollover crashes. Using vehicle models from the vehicle dynamics code (CarSim), several vehicle rollover crashes were created. A second aspect of this research is to develop a meta-model of vehicle roll angle as a function of initiation/influencing factors. Monte Carlo analyses was performed on the response surface generated. The surface meta-model, accuracy model, and global sensitivities were analyzed. These models showed that for both vehicles, speed had the greatest influence on the vehicle’s propensity to rollover. Encroachment angle had the second largest influence for both vehicles.

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  • Supplemental Notes:
    • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
  • Corporate Authors:

    University of Michigan, Ann Arbor

    Ann Arbor, MI  United States  48109

    Texas A&M Transportation Institute

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135

    Center for Advancing Transportation Leadership and Safety (ATLAS Center)

    University of Michigan
    2901 Baxter Road
    Ann Arbor, MI  United States  48109

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Authors:
    • Abu-Odeh, Akram
    • Martinez, Melissa
    • Fletcher, Tristan
    • Harris, Lindsay
    • Kiani, Maysam
  • Publication Date: 2018-7


  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 90p

Subject/Index Terms

Filing Info

  • Accession Number: 01675625
  • Record Type: Publication
  • Report/Paper Numbers: ATLAS-2018-22, ATLAS-602761-00022-1
  • Contract Numbers: DTRT13-G-UTC54
  • Created Date: Jul 12 2018 10:28AM