STEERING AND DYNAMIC STABILITY OF RAILWAY VEHICLES

For railway vehicles having coned wheels mounted on solid axles there is a conflict between dynamic stability and steering ability. It is shown that the stiffness and kinematic properties of all possible interwheelset connections are characterised by two properties describing the distortional characteristics of the vehicle in plan. Within this framework, the various possibilities for steered wheelsets are considered, and several past and current proposals are reviewed. Using the linear approach to dynamic stability and curve negotiation the performance of existing and newly proposed configurations is discussed. For any symmetric, two-axle vehicle it is shown that for perfect steering on a curve there should be zero bending stiffness between the wheelsets. It is further shown that if the bending stiffness is zero, the vehicle lacks dynamic stability as the critical speed of instability is zero. In this case, the vehicle undergoes a steering oscillation which occurs at the kinematic frequency of a single wheelset and which is a motion in which pure rolling occurs. Similar results are obtained with vehicles with three or more axles if adjacent axles are connected by shear structures. However, it is shown that it is possible to satisfy both the requirements of perfect steering and a non-zero critical speed if the vehicle has zero bending stiffness and if, in addition to adjacent wheelsets being connected in shear, at least one pair of non-adjacent axles are connected by a shear structure.

  • Availability:
  • Corporate Authors:

    Swets and Zeitlinger BV

    3476 Heerweg, Publications Department
    Lisse,   Netherlands 
  • Authors:
    • WICKENS, A H
  • Publication Date: 1975-8

Media Info

  • Pagination: p. 15-16
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00142935
  • Record Type: Publication
  • Source Agency: British Railways
  • Files: TRIS
  • Created Date: Dec 15 1976 12:00AM