On the need for bump event correction in vibration test profiles representing road excitations in automobiles
نویسندگان
چکیده
This paper presents an approach to the synthesis of compressed vibration test pro les representing much longer time histories obtained in road testing of ground vehicles. Vibration test pro les are de ned as those related directly to operational testing on speci c road surfaces and which summarize the input to the vehicle in the given conditions. The method extends the 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 speci c ltering tool facilitating bump event identi cation. 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 nal vibration test pro le with respect to the original road data. Test pro les obtained by means of Fourier transform synthesis with subsequent re-insertion of bump events from separated frequency bands were more accurate than those obtained by Fourier synthesis alone. Further developments led to advanced bump re-insertion with synchronization of events occurring in diVerent frequency bands at the same moment of time. Test pro les generated in this way have provided better accuracy compared with the non-synchronized algorithm.
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