RESEARCH ON IDENTIFICATION OF VEHICLE CHARACTERISTICS. PROCEEDINGS ENTITLED "THE DYNAMICS OF VEHICLES ON ROADS AND ON RAILWAY TRACKS"

The concept of inverse sensitivity is discussed as one approach to assessing and resolving vehicle dynamics problems. A systematic method of using parametric sensitivity coefficients is employed to identify equivalent cornering coefficients of front and rear wheels. A mathematical description of using parametric sensitivity coefficients in identifying problems based on the calculus of variations is stated. Experimental vehicle response to a given input is normally considered to correspond to the desired response. Model parameters are automatically adjusted so that model response coincides with vehicle response. A concept of structural stability is introduced to determine the range of parameter variations. The inverse sensitivity concept allows vehicle characteristics to be identified in relation to speed and steering wheel angle. It is shown that cornering characteristics in driving conditions do not coincide with the values from tire-testing machines; they vary with vehicle speed. Cornering characteristics in driving conditions are affected by variation in the balance of roll stiffness via change in suspension geometry, variation in camber angle and tire load caused by rolling, change in the performance of tire slip due to the relative motion of front and rear axles, and other factors.

• Supplemental Notes:
  • Also published in HS-026 982U, "The Dynamics of Vehicles on Roads and on Railway Tracks. Proceedings of International Union of Theoretical and Applied Mechanics Symposium, Delft, The Netherlands, 1975 August 18-22," Amsterdam, 1976 p 119-30.
• Corporate Authors:

  International Union of Theoretical and Applied Mechanics

  Chalmers University of Technology, Sweden
  S-412 96 Gothenburg,   Sweden 
• Authors:
  • Inoue, S
  • Iwamoto, S
  • Watari, A
• Publication Date: 1976

Media Info

• Features: References;
• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Mathematical models; Mechanical stability; Motor vehicles; Speed; Steering; Traffic speed; Vehicle characteristics; Vehicle dynamics
• Old TRIS Terms: Cornering (Vehicle)
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00394098
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: HS-026 988U
• Files: HSL, USDOT
• Created Date: May 31 1985 12:00AM