Kinematics of a smart variable caster mechanism for a vehicle steerable wheel

Jazar, RN; Subic, A; Zhang, N

Kinematics of a smart variable caster mechanism for a vehicle steerable wheel

Jazar, RN Subic, A Zhang, N

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Publication Type:: Journal Article
Citation:: Vehicle System Dynamics, 2012, 50 (12), pp. 1861 - 1875
Issue Date:: 2012-12-01

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Field	Value	Language
dc.contributor.author	Jazar, RN	en_US
dc.contributor.author	Subic, A	en_US
dc.contributor.author	Zhang, N https://orcid.org/0000-0001-6408-0044	en_US
dc.date.issued	2012-12-01	en_US
dc.identifier.citation	Vehicle System Dynamics, 2012, 50 (12), pp. 1861 - 1875	en_US
dc.identifier.issn	0042-3114	en_US
dc.identifier.uri	http://hdl.handle.net/10453/23036
dc.description.abstract	The lateral force of a tyre is a function of the sideslip and camber angles. The camber angle can provide a significant effect on the stability of a vehicle by increasing or adjusting the required lateral force to keep the vehicle on the road. To control the camber angle and hence, the lateral force of each tyre, we can use the caster angle of the wheel. We introduce a possible variable and controllable caster angle in order to adjust the camber angle when the sideslip angle cannot be changed. As long as the left and right wheels are steering together according to a kinematic condition, such as Ackerman, the sideslip angle of the inner wheel cannot be increased independently to alter the reduced lateral force because of weight transfer and reduction of the normal load F z A variable caster mechanism can adjust the caster angle of the wheels to achieve their top capacity and maximise the lateral force, when needed. Such a system would potentially increase the safety, stability, and maneuverability of the vehicles. Using the screw theory, this paper will examine the kinematics of a variable caster and present the required mathematical equation to calculate the camber angle as a function of suspension mechanism parameters and other relevant variables. Having a steered wheel about a tilted steering axis will change the position and orientation of the wheel with respect to the body of the car. This paper provides the required kinematics of such a suspension and extracts the equations in special practical situations. The analysis is for an ideal situation in which we substitute the tyre with its equivalent disc at the tyre plane. © 2012 Copyright Taylor and Francis Group, LLC.	en_US
dc.relation.ispartof	Vehicle System Dynamics	en_US
dc.relation.isbasedon	10.1080/00423114.2012.699075	en_US
dc.subject.classification	Automobile Design & Engineering	en_US
dc.title	Kinematics of a smart variable caster mechanism for a vehicle steerable wheel	en_US
dc.type	Journal Article
utslib.citation.volume	12	en_US
utslib.citation.volume	50	en_US
utslib.for	0913 Mechanical Engineering	en_US
utslib.for	0902 Automotive Engineering	en_US
utslib.for	01 Mathematical Sciences	en_US
utslib.for	09 Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	closed_access
pubs.issue	12	en_US
pubs.publication-status	Published	en_US
pubs.volume	50	en_US

Abstract:

The lateral force of a tyre is a function of the sideslip and camber angles. The camber angle can provide a significant effect on the stability of a vehicle by increasing or adjusting the required lateral force to keep the vehicle on the road. To control the camber angle and hence, the lateral force of each tyre, we can use the caster angle of the wheel. We introduce a possible variable and controllable caster angle in order to adjust the camber angle when the sideslip angle cannot be changed. As long as the left and right wheels are steering together according to a kinematic condition, such as Ackerman, the sideslip angle of the inner wheel cannot be increased independently to alter the reduced lateral force because of weight transfer and reduction of the normal load F z A variable caster mechanism can adjust the caster angle of the wheels to achieve their top capacity and maximise the lateral force, when needed. Such a system would potentially increase the safety, stability, and maneuverability of the vehicles. Using the screw theory, this paper will examine the kinematics of a variable caster and present the required mathematical equation to calculate the camber angle as a function of suspension mechanism parameters and other relevant variables. Having a steered wheel about a tilted steering axis will change the position and orientation of the wheel with respect to the body of the car. This paper provides the required kinematics of such a suspension and extracts the equations in special practical situations. The analysis is for an ideal situation in which we substitute the tyre with its equivalent disc at the tyre plane. © 2012 Copyright Taylor and Francis Group, LLC.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/23036