Through a simple model of a quarter-car, the isolation properties of a semi-active suspension has been studied using the SA1 sky-hook like algorithm. It has been shown that the isolation provided by the suspension is degraded by the nonlinearity of the semi-active algorithm, which tends to generate high frequency components at the harmonics of the unsprung mass resonance. These high frequency vibrations may potentially generate noise through the excitation of flexible modes of the vehicle. This energy transfer phenomenon may be alleviated to some extent by different means, like filtering the control signal or adding a resilient mounting to the semi-active damper. In this paper, an alternative semi-active algorithm has been presented. By imposing smooth variations to the damper constant, it has been found that, for a similar reduction of the body resonance, the isolation at high frequency is improved compared to the continuous semi-active sky-hook. Additionally, the RMS value of the sprung mass acceleration is also reduced, mainly because of a better damping of the wheel resonance.
High frequency energy transfer in semi-active suspension
Hochfrequenz-Energieübertragung in einer halbaktiven Aufhängung
Journal of Sound and Vibration ; 329 , 22 ; 4604-4616
2010
13 Seiten, 14 Bilder, 24 Quellen
Aufsatz (Zeitschrift)
Englisch
High frequency energy transfer in semi-active suspension
Online Contents | 2010
|Semi-active suspension and semi-active suspension control method and device
Europäisches Patentamt | 2024
|Kraftfahrwesen | 1987
|Semi-Active Hydropneumatic Suspension
British Library Conference Proceedings | 1994
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