An attempt of an employment of a continuous wavelet transform for evaluation of temporary comfort disturbances

• Autorzy: Grzegożek W. , Szczygieł J. , Król S.
• Języki publikacji: EN

Abstrakty

EN

This paper focuses on an attempt of an employment of a continuous wavelet transform as a tool of time-frequency analysis to identify and asses the comfort on discrete events. A short review of practical procedures for predicting vibration discomfort defined by ISO 2631-5 and BS 6041, ENV 12299 is enclosed. The results of research of tram temporary comfort disturbances are also described in the paper. The research enclosed the comfort on curve transitions and comfort on discrete events. Research was carried out in the old city centre as in this area there are a lot of curves and large number of excitations can be expected. An exemplary analysis of tram comfort using a continuous wavelet transform is presented. The signals in time intervals in which PCr and PDE indexes that have high values are analyzed. Moreover, the evaluation of comfort disturbances using wavelet transform based on Morlet mother wavelet is done. The continuous wavelet transform that was employed proves high usefulness of this method for assessment of temporary comfort disturbances. The results of Fourier transform of the signals measured are also presented in this article. Traditional methods based on the vibration dose value and frequency weighting methodsfor assessment of these vibrations are less useful in respect to non-stationary character of temporary disturbances.

Słowa kluczowe

EN

ride comfort analysis; continuous wavelet transform (CWT); vibration discomfort; comfort on discrete events

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2009
• Tom: Vol. 16, No. 1
• Strony: 165--172
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Grzegożek W.

autor

Szczygieł J.

autor

Król S.

• Cracow University of Technology Jana Pawła II37, 31-864 Cracow, Poland tel. [phone],

Bibliografia

• [1] Chudzikiewicz, A., Groll, W., Metoda oceny komfortu jazdy w łukach i krzywych przejściowych, Pojazdy Szynowe 2002: Nowe wyzwania i technologie dla logistyki: XV Konferencja Naukowo-Techniczna, Szklarska Poręba, 2002.
• [2] Griffin, M. J., Discomfort from feeling vehicle vibration, Vehicle System Dynamics, Vol. 45, Nos. 7-8, 679-698, 2007.
• [3] CEN ENV 12299, Railway applications – Ride comfort for passengers – Measurements and evaluation, Draft, Brussels, 1999, 2006.
• [4] ISO 2631, Evaluation of human exposure to whole-body vibration – Part 1: General requirements, Geneve, 1985.
• [5] BS 6841, Guide to measurement and evaluation of human exposure to wholebody mechanical vibration and repeated shock, British Standard Institution, London, 1985.
• [6] Barański R., Falkowa funkcja przejścia w analizie drgań układu „narzędzie ręczne – ręka operatora”, Doctoral thesis, AGH, 2005.
• [7] Augustyniak P., Transformacje falkowe w zastosowaniach elektrodiagnostycznych, AGH, Uczelniane Wydawnictwa Naukowo-Dydaktyczne, 2003.
• [8] Białasiewicz J. T., Falki i aproksymacje, Wydawnictwa Naukowo Techniczne, 2004.