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Heavy vehicle pitch dynamics and suspension tuning

Cao, Dongpu and Rakheja, Subhash and Su, Chun-Yi (2008) Heavy vehicle pitch dynamics and suspension tuning. Vehicle system dynamics, 46 (10). pp. 931-953. ISSN 0042-3114

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    Abstract

    The influence of suspension tuning of passenger cars on bounce and pitch ride performance has been explored in a number of studies, while only minimal efforts have been made for establishing similar rules for heavy vehicles. This study aims to explore pitch dynamics and suspension tunings of a two-axle heavy vehicle with unconnected suspension, which could also provide valuable information for heavy vehicles with coupled suspensions. Based on a generalised pitch-plane model of a two-axle heavy vehicle integrating either unconnected or coupled suspension, three dimensionless measures of suspension properties are defined and analysednamely the pitch margin (PM), pitch stiffness ratio (PSR), and coupled pitch stiffness ratio (CPSR)for different unconnected suspension tunings and load conditions. Dynamic responses of the vehicle with three different load conditions and five different tunings of the unconnected suspension are obtained under excitations arising from three different random road roughness conditions and a wide range of driving speeds, and braking manoeuvres. The responses are evaluated in terms of performance measures related to vertical and pitch ride, dynamic tyre load, suspension travel, and pitch-attitude control characteristics of the vehicle. Fundamental relationships between the vehicle responses and the proposed suspension measures (PM, PSR, and CPSR) are established, based on which some basic suspension tuning rules for heavy vehicles with unconnected suspensions are also proposed.

    Item Type: Article
    Journal or Publication Title: Vehicle system dynamics
    Additional Information: The final, definitive version of this article has been published in the Journal, Vehicle System Dynamics, 46 (10), 2008, © Informa Plc
    Uncontrolled Keywords: heavy vehicles ; pitch dynamics ; suspension tuning ; unconnected suspension ; dimensionless suspension measures ; tuning rules ; BRAKING ; MODEL
    Subjects: UNSPECIFIED
    Departments: Faculty of Science and Technology > Engineering
    ID Code: 50046
    Deposited By: ep_importer_pure
    Deposited On: 29 Sep 2011 14:29
    Refereed?: Yes
    Published?: Published
    Last Modified: 24 Jan 2014 05:21
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/50046

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