The Effect of Plate Discretization on Accuracy of the Sound Radiation Efficiency Measurements

• Autorzy: Kolber K. , Snakowska A. , Kozupa M.

Identyfikatory

DOI

10.2478/aoa-2014-0055

• Języki publikacji: EN

Abstrakty

EN

This paper deals with the problem of the effect of discretization level and certain other parameters characterizing the measurement setup on accuracy of the process of determination of the sound radiation efficiency by means of the Discrete Calculation Method (DCM) described by Hashimoto (2001). The idea behind DCM consists in virtual division of an examined sound radiating structure into rectangular elements each of which is further assumed to contribute to the total radiation effect in the same way as a rigid circular piston having the surface area equal to this of the corresponding virtual element and vibrating in an infinite rigid baffle. The advantage of the method over conventional sound radiation efficiency measurement techniques consists in the fact that instead of acoustic pressure values, source (plate) vibration velocity amplitude values are measured in a selected number of regularly distributed points. In many cases, this allows to determine the sound radiation efficiency with sufficient accuracy, especially for the low frequency regime. The key part of the paper is an analysis of the effect of discretization level (i.e. the choice of the number of points at which vibration amplitude measurements are to be taken with the use of accelerometers) on results obtained with the use of the method and their accuracy. The problem of determining an optimum level of discretization for given excitation frequency range is a very important issue as the labor intensity (time-consuming aspect) of the method is one of its main flaws. As far as the technical aspect of the method is concerned, two different geometrical configurations of the measurement setup were tested.

Słowa kluczowe

EN

sound radiation efficiency; sound radiation from plates; discrete calculation method

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2014
• Tom: Vol. 39, No. 4
• Strony: 511--518
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Kolber K.

• AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, Department of Mechanics and Vibroacoustics Al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Snakowska A.

• AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, Department of Mechanics and Vibroacoustics Al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Kozupa M.

• ABB Sp. z o.o. Corporate Research Starowislna 13A, 31-038 Kraków, Poland

Bibliografia

• 1. ARENAS J. P. (2009), Matrix method for estimating the sound power radiated from a vibrating plate for noise control engineering applications, Latin American Applied Research 39, 345-352
• 2. FAHY F., GARDONIO P., Sound and Structural Vibration – Radiation, Transmission and Response, Amsterdam etc., Academic Press 2007, 135-240
• 3. HASHIMOTO N. (2001), Measurement of sound radiation efficiency by the discrete calculation method, Applied Acoustics, 62, 429-446
• 4. LEPPINGTON F. G., BROADBENT E. G., HERON K. H. (1982), The Acoustic Radiation Efficiency of Rectangular Panels, Proc. R. Soc. Lond. A 382, 245-271
• 5. LI W. L. (2001), An analytical solution for the self- and mutual radiation resistances of a rectangular plate, Journal of Sound and Vibration, 245, 1, 1-16
• 6. MAIDANIK G. (1962), Response of Ribbed Panels to Reverberant Acoustic Fields, J. Acoust. Soc. Amer. 34, 6, 809-826
• 7. PUTRA A., THOMPSON D. J. (2010), Sound radiation from rectangular baffled and unbaffled plates, Applied Acoustics 71, 1113-1125
• 8. RDZANEK W.P., RDZANEK W.J., SZEMELA K. (2010), Asymptotic approximation of the modal acoustic impedance of a circular membrane, Journal of Computational Acoustics, 18, 4, 335–362
• 9. RDZANEK W. P., RDZANEK W. J., PIECZONKA D. (2012), The Acoustic Impedance of a Vibrating Annular Piston Located on a Flat Rigid Baffle Around a Semi-Infinite Circular Rigid Cylinder, Archives of Acoustics, 37, 4, 411–422
• 10. SKUDRZYK E. (1971), The Foundations of Acoustics - Basic Mathematics and Basic Acoustics, New York – Wien, Springer – Velag, 663-676
• 11. WALLACE C. E. (1970), Radiation Resistance of Rectangular Panel, J. Acoust. Soc. Amer. 51, 946-952