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Non-dimensionalised closed-form parametric analysis of semi-active vehicle suspensions using a quarter-car model

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Abstract:

This article provides a non-dimensionalised closed-form analysis of semi-active vehicle suspensions, using a quarter-car model. The derivation of the closed-form solutions for three indices that can be used for ride comfort, vehicle handling, and stability are presented based on non-dimensionalised suspension parameters. The behaviour of semi-active vehicle suspensions is evaluated using skyhook, groundhook, and hybrid control policies, and compared with passive suspensions. The relationship between vibration isolation, suspension deflection, and road holding is studied, using three performance indices based on the mean square of the sprung mass acceleration, rattle space, and tyre deflection, respectively. The results of the study indicate that the hybrid control policy yields significantly better comfort than a passive suspension, without reducing the road-holding quality or increasing the suspension displacement for typical passenger cars. The results also indicate that for typical passenger cars, the hybrid control policy results in a better compromise between comfort, road holding and suspension travel requirements than both the skyhook and groundhook control methods.

Keywords: closed-form; groundhook; hybrid; non-dimensionalised; semi-active; skyhook; suspensions; vehicle dynamics

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/00423114.2010.482671

Affiliations: Center for Vehicle Systems & Safety (CVeSS), Blacksburg, VA, USA

Publication date: January 1, 2011

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