TORSIONAL DESIGN ASPECTS OF LONG WHEELBASE VEHICLES

Torsional stiffness - does it need to be high or low? What is the effect of suspension roll stiffness? What is the best way of distributing torsion resisting structure? These are some of the questions in the mind of the designer of the vehicle chassis, and this paper examines some of the aspects of designing for torsion. Four types of torsional loading are identified, covering asymmetrically distributed load, ground plane twist, lateral acceleration due to cornering, turning loads and dynamic response from ground plane ripple. Two simplified chassis models are considered - the 'backbone', consisting of one or more torsionally resistant longitudinal members; the peripheral frame, in which the two torsionally flexible longitudinal members are connected at their ends by torsionally resistant members; and the ladder frame, in which the longitudinals are connected by many cross-members. The effect of varying the cross-sectional shape, size and disposition of the torsionally resistant members is examined from the point of view of minimising weight while maintaining a satisfactory stress level. The analyses use both simple structural theory and computer analysis for the more complex structures. /Author/ /TRRL/

Media Info

  • Features: Figures; References;
  • Pagination: p. 123-148

Subject/Index Terms

Filing Info

  • Accession Number: 00137796
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0853346429
  • Report/Paper Numbers: Proceeding
  • Files: ITRD, TRIS
  • Created Date: Apr 27 1977 12:00AM