AUTOMOBILE DYNAMICS - A COMPUTER SIMULATION OF THREE DIMENSIONAL MOTIONS FOR USE IN STUDIES OF BRAKING SYSTEMS AND OF THE DRIVING TASK

THIS SIMULATION IS A SPECIALIZED VERSION OF THE EARLIER DEVELOPMENT DESCRIBED IN CORNELL AERONAUTICAL LABORATORY REPORT NO. VJ-2251-V-3, DECEMBER 1968, AND INCLUDES THE UPPER LIMITS OF CONTROL AS WELL AS THE LINEAR RANGES OF OPERATION. THIS VERSION INCORPORATES REFINEMENTS AND EXTENSIONS TO THE EARLIER DEVELOPMENT IN TERMS OF THE ANALYTICAL TREATMENTS OF TIRE FORCES, SUSPENSION PROPERTIES AND TERRAIN DEFINITIONS. ADDITIONALLY ANALYTICAL REPRESENTATIONS OF THE BRAKING SYSTEM AND THE DRIVE LINE AND APPROXIMATIONS OF ROLLING RESISTANCE AND AERODYNAMIC DRAG HAVE BEEN INTRODUCED. SPRUNG MASS IMPACT ASPECTS, WHICH WERE IN THE EARLIER SIMULATION, HAVE BEEN REMOVED FROM THIS SPECIALIZED VERSION OF THE MODEL. THE MATHEMATICAL MODEL AND PRESENTS DETAILED ANALYSIS, EQUATIONS AND LOGIC ARE DESCRIBED. SAMPLE OUTPUTS OF THE MODIFIED COMPUTER PROGRAM ARE ALSO PRESENTED AND DISCUSSED. A RIGOROUS VALIDATION STUDY WILL BE PERFORMED. RESPONSE PREDICTIONS OBTAINED WITH THIS SIMULATION HAVE BEEN SHOWN TO BE IN GROSS AGREEMENT WITH EXPERIMENTAL DATA. IT IS CONCLUDED THAT UNDER REALISTIC OPERATING CONDITIONS THE COMPUTER SIMULATION THAT HAS BEEN DEVELOPED IS ADAPTABLE TO STUDIES OF THE PERFORMANCE OF BRAKING SYSTEMS AND OF THE DRIVING TASK. /FHWA/

• Supplemental Notes:
  • Cpr-11-3988, 3512-022
• Corporate Authors:

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • MCHENRY, R R
  • DeLeys, N J
• Publication Date: 1970-8

Subject/Index Terms

• TRT Terms: Aerodynamics; Automobiles; Brakes; Computers; Drag; Driving; Dynamics; Force; Mathematical models; Motion; Rolling; Simulation; Suspensions; Terrain; Tires
• Old TRIS Terms: Resistance
• Subject Areas: Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00222600
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Files: TRIS, USDOT
• Created Date: Apr 1 1971 12:00AM