Handling Comparison of Vehicles with Steerable Auxiliary Axles

Paper #:
  • 2013-01-2353

Published:
  • 2013-09-24
DOI:
  • 10.4271/2013-01-2353
Citation:
Williams, D. and Nhila, A., "Handling Comparison of Vehicles with Steerable Auxiliary Axles," SAE Int. J. Commer. Veh. 6(2):281-287, 2013, doi:10.4271/2013-01-2353.
Pages:
7
Abstract:
Self-steered or caster steered axles are commonly used to support load on multi-axle commercial vehicles. Such axles can allow more payload to be hauled in some vehicle configurations under the existing bridge formulas. These self-steered axles cannot generate a side load, and serve to unload surrounding fixed axles that do generate lateral forces to turn the vehicle with payload. Since the tire's ability to generate a side load is dependent upon its load, the use of caster-steered auxiliary axles can upset the balance (or the understeering) properties of the vehicle. This work will define the effect of adding a caster steered auxiliary axle and compare it with a steerable axle that positively controls the steer angle and thereby generates a lateral force. This work assumes the reader has a basic knowledge of the well publicized “bicycle” model, and particularly its extension to multi-axle vehicles.
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