AUTOMOBILE DYNAMICS-COMPARISON OF CORNERING AND RIDE RESPONSE PREDICTIONS WITH LINEAR THEORY AND WITH A NON- LINEAR COMPUTER SIMULATION

A SERIES OF LINEARIZED SMALL PERTURBATION ANALYSES MADE OF THE RIDE AND LATERAL-DIRECTIONAL MOTIONS OF A HIGH PERFORMANCE VEHICLE ARE DOCUMENTED. RESPONSE PREDICTIONS BASED ON LINEAR THEORY ARE COMPARED WITH THOSE OF THE 11-DEGREE OF FREEDOM NONLINEAR MATHEMATICAL MODEL WHICH HAS BEEN EXTENSIVELY VALIDATED. THIS REPORT SHOWS THAT RESPONSE PREDICTIONS BASED ON SIMPLE LINEAR MODELS FOR SEPARATE RIDE AND LATERAL-DIRECTIONAL MOTIONS, CAN BE MADE TO FIT THE MORE COMPLEX NONLINEAR SIMULATION RESULTS FOR SMALL INPUT LEVELS (E.G., A RIDE DISTURBANCE OF 1 INCH AMPLITUDE WITH NO CORNERING, AND A LATERAL ACCELERATION OF 0.25G ON FLAT, HORIZONTAL TERRAIN.). HOWEVER, AS THE MAGNITUDES OF THE INPUTS ARE INCREASED, THE COMPUTER SIMULATION EXHIBITS EFFECTS OF NONLINEARITIES BEYOND THE SCOPE OF LINEAR THEORY THAT ARE WELL KNOWN IN COMPETITION DRIVING. /BPR/

• Supplemental Notes:
  • Adm Cont, CAL NO VJ2251-VJ, ORDER B5-252
• Corporate Authors:

  Cornell Aeronautical Laboratory, Incorporated

  4455 Genesee Street
  Buffalo, NY  United States  14221

  New York State Department of Transportation

  1220 Washington Avenue
  Albany, NY  United States  12232

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Larrabee, E E
• Publication Date: 1969-5

Subject/Index Terms

• TRT Terms: Automobiles; Computer programs; Linear systems; Mathematical models; Perturbation theory; Simulation; Steering; Vehicle dynamics
• Old TRIS Terms: Cornering (Vehicle); Lateral movement
• Subject Areas: Highways; Safety and Human Factors;

Filing Info

• Accession Number: 00222583
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS, STATEDOT
• Created Date: Sep 22 1994 12:00AM