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Analysis of Ackermann Steering Geometry
Technical Paper
2006-01-3638
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Ackermann steering geometry relates the steer angle of an inside tire to that of the outside tire. When turning the inside tire travels a shorter radius than the outside tire and thus must have a greater steer angle to avoid tire scrub. Classic Ackermann minimizes scrub by positioning both tires perpendicular to the turn center. It can have a significant impact on tire wear [1]. Ackermann analysis can also be used as a tuning tool in cases where classic Ackermann may not be the objective.
Ackermann has been around longer than the motor vehicle - over a century - but there is little rigorous analysis in the literature. There are two common measurements of Ackermann which give very different results. Both are used in texts and computer programs[8] Yet a literature search revealed only a couple sentences discussing the relationship between the two.
This paper presents a mathematical analysis of Ackermann which explains the two measurements and develops a formula relating the two metrics. It also derives additional analytical tools which provide better understanding of Ackermann steering geometry.
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Citation
Mitchell, W., Staniforth, A., and Scott, I., "Analysis of Ackermann Steering Geometry," SAE Technical Paper 2006-01-3638, 2006, https://doi.org/10.4271/2006-01-3638.Also In
References
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