Influence of tyre properties on the ride dynamics of heavy off-road vehicles
2011 (English)Conference paper (Other academic)
Wheeled earthmoving machines are a class of off-road vehicles that are typically equipped withlarge and soft tyres to obtain sufficient traction and flotation on unpaved surfaces. Theunsuspended mass is typically larger than for road vehicles. This indicates that the tyreproperties will affect not only the dynamics of the wheels and axles, but may also have asubstantial effect on the ride dynamics of the vehicle. This paper investigates how the tyrecharacteristics influence the optimal design of a wheel suspension for an off-road constructionmachine. Frequency domain analysis of a pitch and bounce model show that overallacceleration levels are significantly affected by tyre stiffness and damping, but that the tradeoffbetween pitch and bounce is unaffected by tyre properties although the main ride frequenciesare offset. Also, optimal suspension damping is fairly independent of the tyres. It is alsoinvestigated if a locked front axle suspension may be used in the loaded case, to simplifysuspension system design by using tyres as sole suspension elements. It is found that thisconfiguration leads to decreased ride quality, mainly due to the increased suspension stiffnessand lack of damping.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-33884OAI: oai:DiVA.org:kth-33884DiVA: diva2:418341
Joint 9th Asia-Pacific ISTVS Conference and Annual Meeting of Japanese Society for Terramechanics
QC 201105312011-05-222011-05-222011-05-31Bibliographically approved