Acoustical Analysis of Enclosure as Initial Approach to Vehicle Induced Noise Analysis Comparatevely Using STFT and Wavelets

• Autorzy: Błażejewski A. , Kozioł P. , Łuczak M.

Identyfikatory

DOI

10.2478/aoa-2014-0042

• Języki publikacji: EN

Abstrakty

EN

It is assumed in the paper that the signals in the enclosure in a transient period are similar to a noise induced by vehicles, tracks, cars, etc. passing by. The components of such signals usually points out specific dynamic processes running during the observation or measurements. In order to choose the best method of analysis of these phenomena, an acoustic field in a closed space with a sound source inside is created. Acoustic modes of this space influence the sound field. Analytically, the modal analyses describe the above mentioned phenomena. The experimental measurements were conducted in the room that might comprise the closed space with known boundary conditions and the sound source Br¨uel & Kjær Omni-directional type 4292 inside. To record sound signals before the field’s steady state was reached, the microphone type 4349 and the 4-channel frontend 3590 had been used. The obtained signals have been analysed by using two approaches, i.e. Fourier and the wavelet analysis, with the emphasis on their efficiency and the capability to recognise important details of the signal. The results obtained for the enclosure might lead to the formulation of a methodology for an extended investigation of a rail track or vehicles dynamics.

Słowa kluczowe

EN

modal analysis; short-time Fourier transform; wavelet transform; acoustic signal processing

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2014
• Tom: Vol. 39, No. 3
• Strony: 385--394
• Opis fizyczny: Bibliogr. 8 poz., rys., wykr.

Twórcy

autor

Błażejewski A.

• Institute of Technology and Education, Koszalin University of Technology Sniadeckich 2, 75-453 Koszalin, Poland

autor

Kozioł P.

• Department of Civil and Environmental Engineering, Koszalin University of Technology Sniadeckich 2, 75-453 Koszalin, Poland

autor

Łuczak M.

• Department of Civil and Environmental Engineering, Koszalin University of Technology Sniadeckich 2, 75-453 Koszalin, Poland

Bibliografia

• 1. Błażejewski a., (2013), Modal analysis application in passive sound level control inside bounded space in steady state, [in:] Dynamical Systems-Application, Awrejcewicz J., Kazimierczak M., Olejnik P., Mrozowski J. [Eds.], pp. 409–421, Wydawnictwo Politechniki Łódzkiej, Łódz.
• 2. Koziol P. (2010), Wavelet approach for the vibratory analysis of beam-soil structures: Vibrations of dynamically loaded systems, VDM Verlag Dr. Müller.
• 3. Koziol P., Mares C. (2010), Wavelet approach for vibration analysis of fast moving load on a viscoelastic medium, Shock and Vibration, 17, 4–5, 461–472.
• 4. Koziol P., Mares C., Esat I. (2008), Wavelet approach to vibratory analysis of surface due to a load moving in the layer, International Journal of Solids and Structures, 45, 2140–2159.
• 5. Mallat S. (1998), A wavelet tour of signal processing, Academic Press Inc. Ltd, London.
• 6. Meissner M. (2008), Influence of wall absorption on low-frequency dependence of reverberation time in room of irregular shape, Applied Acoustics, 69, 583–590.
• 7. Morse P.M., Bolt R.H. (1944), Sound waves in rooms, Reviews of Modern Physics, 16, 69–150.
• 8. Morse P.M., Ingard K.U. (1968), Theoretical acoustics, Mc Graw-Hill.