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Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/1443

Title: On the need for bump event correction in vibration test profiles representing road excitations in automobiles
Authors: Giacomin, J
Steinwolf, A
Staszewski, WJ
Keywords: Vibration test profile
Vehicle
In-house testing
Wavelet analysis
Bump events
Shocks
Probability density function tails
Publication Date: 2002
Publisher: Professional Engineering
Citation: Proceedings of the IMechE, Part D - Journal of Automobile Engineering. 216: 279-295
Abstract: This paper presents an approach to the synthesis of compressed vibration test profiles representing much longer time histories obtained in road testing of ground vehicles. Vibration test profiles are defined as those related directly to operational testing on specific road surfaces and which summarise the input to the vehicle in the given conditions. The method extends classical Fourier transform technique by means of bump event correction in the background Fourier signal where the bump event term implies a high-amplitude transient event of the shock type. The orthogonal wavelet decomposition was used as a specific filtering tool facilitating bump event identification. Examples of seat guide vertical acceleration have been considered. Calculated probability density functions suggest the ability of the bump correction method to improve the statistical accuracy of the final vibration test profile with respect to the original road data. Test profiles obtained by means of Fourier transform synthesis with subsequent reinsertion of bump events from separated frequency bands were more accurate than those obtained by Fourier synthesis alone. Further developments led to advanced bump reinsertion with synchronisation of events occurring in different frequency bands at the same moment of time. Test profiles generated in this way have provided better accuracy compared to the non-synchronised algorithm.
URI: http://www.ingentaconnect.com/content/pep/jae/2002/00000216/00000004/art00005?token=004a198d2c6ebdf057630505d2a67232d45237b757a73385e5720415d7d6b4042dcdff7e81
http://bura.brunel.ac.uk/handle/2438/1443
Appears in Collections:Design
School of Engineering and Design Research papers

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