REVISION OF SIMULATION MODEL OF AUTOMOBILE COLLISIONS COMPUTER PROGRAM: INVESTIGATION OF NEW INTEGRATION ALGORITHM

SMAC (Simulated Model of Automobile Collisions) is a computerized program which recreates collision events between two automobiles. Its purpose is to provide a data bank from which information on the causes and consequences of these accidents can be drawn and to aid highway planners and the public in general to avoid unnecessary accidents and mitigate the effects of those which are unavoidable. The original SMAC Program was based on a fixed time-step integration method (Runge-Kutta). This report deals with efforts to improve the efficiency of SMAC by incorporating into it the Newmark Beta Variable Time-Step Method. It provides comparisons between baseline runs (using the original SMAC) and runs using the modified SMAC (CHI-SMAC), which contains a unique integration algorithm based on the Newmark Method but specialized to meet the overall requirements of the SMAC Program. Based on preliminary investigation of the new procedure, significant progress has been recorded in reducing computer execution time. (Portions of this document are not fully legible)

• Corporate Authors:

  Chi Associates Incorporated

  Arlington, VA  United States 

  National Highway Traffic Safety Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Chi, M
  • Neal, E
  • Tucker, J R
• Publication Date: 1977-5-20

Media Info

• Pagination: 142 p.

Subject/Index Terms

• TRT Terms: Algorithms; Computer programs; Crash injury research; Crashes; Digital simulation; Equations of motion; Integrated systems; Numerical integration; Prevention; Research; Safety; Simulation; Subroutines; Traffic crashes; Traffic safety
• Identifier Terms: FORTRAN (Computer program language)
• Uncontrolled Terms: Integration; Motor vehicle accidents
• Subject Areas: Highways; Research; Safety and Human Factors; Security and Emergencies;

Filing Info

• Accession Number: 00176245
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: DOT-HS-803-294 Final Rpt.
• Contract Numbers: DOT-HS-7-01545
• Files: TRIS, USDOT
• Created Date: Aug 19 1978 12:00AM