A methodology to analyze the vehicle vibration response to deformable terrain stiffness and damping properties

Hamid Taghavifar, Subhash Rakheja

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A dynamic soil–wheel interaction model that considers energy loss due to soil compaction during multiple trafficking can potentially yield an enhanced understanding of vibration responses of a vehicle traversing the deformable terrains. This article presents a practical methodology for modeling the vehicle ride vibration responses, while interacting with deformable terrain irregularities. The proposed formulations incorporate adaptive contact patch and tire deflection in addition to soil sinkage using the Bekker’s pressure–sinkage relationship. The effect of repeated passes of the driven as well as driving wheels on effective stiffness and damping of the soil is also incorporated in the proposed formulations considering a tire slip term by adoption of the Holm’s theory. An in-plane 4-degrees-of-freedom vehicle model is formulated considering a generic compliant tire coupled with the deformable soil model and MSC ADAMS multibody dynamic model is employed for the co-simulations and validation purpose. The coupled terrain–vehicle is analyzed to determine chassis vibration responses together with variations in the dynamic tire–terrain contact force in the time and frequency domains. The results suggested that the root mean square vertical and pitch chassis acceleration responses of the vehicle operating on a deformable terrain are lower than those obtained for the undeformable terrain. The ratio of the dynamic tire force to the static load, a measure of road holding of the vehicle, however, tends to be higher for the deformable terrain. Both the road holding and root mean square chassis acceleration responses, invariably, show a significant increase with increase in the vehicle forward speed. The proposed methodology may serve as an important tool for assessing the vibration exposure of operators and for deriving optimal suspension designs for vehicles operating on deformable terrains.
Original languageEnglish
Pages (from-to)1123-1136
Number of pages14
JournalProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
Volume234
Issue number4
Early online date21 Jul 2019
DOIs
Publication statusPublished - 1 Mar 2020
Externally publishedYes

Keywords

  • Terrain deformation
  • multipass
  • soil damping
  • tire
  • vehicle ride comfort

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering

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