The efficiency of tram articulations compared to vibroacoustic emissions

Tomasz Nowakowski; Paweł Komorski; Franciszek Tomaszewski

doi:10.5604/01.3001.0010.6161

Authors

Tomasz Nowakowski Poznan University of Technology, Department of Rail Vehicles, Poznan, Poland Author
Paweł Komorski Poznan University of Technology, Department of Rail Vehicles, Poznan, Poland Author
Franciszek Tomaszewski Poznan University of Technology, Department of Rail Vehicles, Poznan, Poland Author

DOI:

https://doi.org/10.5604/01.3001.0010.6161

Keywords:

tram articulations, sound quality, vibrations, squealing noise

Abstract

Human quality of life is constantly increasing, and so does the comfort of travel by various means of public transport, especially rail transport. One of the more crucial criteria for assessment of travel comfort is vibroacoustic comfort. This aspect is also substantial among rail vehicle operators and manufacturers. Sound quality evaluation is related to psychoacoustic indicators, but reducing the levels of acoustic pressure does not always correlate to increased quality of the perceived sound and improvement of human sound perception. Moreover the cause of unpleasant noise has to be taken into consideration. In many examples it is induced by specific vibrations and/or friction forces through components. The following article presents experimental research carried out in the in-situ conditions, testing the quality of work carried out by tram articulations considering vibroacoustic emissions. Several measurements were taken of vibroacoustic signals in several urban rail vehicles of the same type. Two different trams were chosen for analysis and their vibroacoustic emission levels as well as sound quality parameters were compared. One of the more crucial aspects of the research was to determine the dependency between vibrations around the area of articulations and squealing noise. The results indicate a large correlation between signals and deterioration in the work quality of the articulation in the given tram. Moreover, the authors suggest expanding on currently carried out maintenance in order to minimise inconvenient vibroacoustic phenomena during use.

References

ENGEL, Z., 2013. Environmental protection against vibration and noise, PWN (Scientific Polish Publishing House). Available at: (in Polish).

FACEBOOK SOCIAL GROUP “SPOTTED: MPK POZNAN,” 2017. P: Tymczasem w tatrze... Przecież to się jechać nie da. Available at: https://www.facebook.com/332551400182715/ videos/1127014797403034/ [Accessed April 27, 2017].

FASTL, H. & ZWICKER, E., 2007. Psychoacoustics: Facts and models, Springer-Verlag, Berlin.

HU, K. et al, 2014. Sound quality evaluation and optimization for interior noise of rail vehicle. Advances in Mechanical Engineering, 2014.

KHAN, S., 2002. Evaluation of Acoustical Comfort in Passenger Trains. Acta Acustica united with Acustica,, 88(2), pp. 270-277.

LEI-MING, S., SHOU-GUAN, S. & XIN-HUA, Z., 2005. Analysis of Acoustic Property of Space Inside Rail Car Based FEM. Noise and Vibration Control, 2.

LETOURNEAUX, F., GUERRAND, S. & POISSON, F., 2000. Assessment of the Acoustical Comfort in High-Speed Trains At the Sncf: Integration of Subjective Parameters. Journal of Sound and Vibration, 231(3), pp. 839-846. Available at: http://linkinghub.elsevier.com/retrieve/pii/S00 22460X99925671.

ORRENIUS, U. & CARLSSON, U., 2014. Attractive train interiors: Minimizing annoying sound and vibration. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 126, pp. 707-714.

ORRENIUS, U. & CARLSSON, U., 2013. Attractive Train Interiors: Minimizing Annoying Sound and Vibration. KTH Railway Group. Available at: http://link.springer.com/10.1007/978-3-662-44832-8_84.

PARIZET, E., HAMZAOUI, N. & JACQUEMOUD, J., 2002. Noise assessment in a high-speed train. Applied Acoustics, 63(10), pp. 1109-1124.

PARK, B. et al., 2015. Short-term noise annoyance assessment in passenger compartments of high-speed trains under sudden variation. Applied Acoustics, 97, pp. 46-53. Available at: http://dx.doi.org/10.1016/j.apacoust.2015.04.007.

SANDROCK, S. et al., 2008. Experimental studies on annoyance caused by noises from trams and buses. Journal of Sound and Vibration, 313(3–5), pp. 908-919.

STANDARDIZATION, E.C. FOR, 2010. DIN 45631/A1 standard: Calculation Of Loudness Level And Loudness From The Sound Spectrum - Zwicker Method,

ZHANG, X. et al., 2012. Sound Quality Subjective Evaluation Analysis of Noise Inside High-speed Trains. Proceedings of 2012 International Conference on Mechanical Engineering and Material Science, (Mems), pp. 634-636.