Estimating Surface Acoustic Impedance With the Inverse Method

• Autorzy: Piechowicz J.
• Języki publikacji: EN

Abstrakty

EN

Sound field parameters are predicted with numerical methods in sound control systems, in acoustic designs of building and in sound field simulations. Those methods define the acoustic properties of surfaces, such as sound absorption coefficients or acoustic impedance, to determine boundary conditions. Several in situ measurement techniques were developed; one of them uses 2 microphones to measure direct and reflected sound over a planar test surface. Another approach is used in the inverse boundary elements method, in which estimating acoustic impedance of a surface is expressed as an inverse boundary problem. The boundary values can be found from multipoint sound pressure measurements in the interior of a room. This method can be applied to arbitrarily-shaped surfaces. This investigation is part of a research programme on using inverse methods in industrial room acoustics.

Słowa kluczowe

EN

room acoustics; sound absorption coefficient; acoustic impedance

• Wydawca: Taylor & Francis
• Czasopismo: International Journal of Occupational Safety and Ergonomics
• Rocznik: 2011
• Tom: Vol. 17, No. 3
• Strony: 271--276
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Piechowicz J.

• Department of Mechanics and Vibroacoustics, AGH University of Science and Technology, Kraków, Poland

Bibliografia

• 1.Webster AG. Acoustical impedance and theory of horns and of the phonograph. Proceedings of the National Academy of Sciences. 1919;5:275–82.
• 2.European Committee for Standardization (CEN). Acoustics—determination of sound absorption coefficient and impedance in impedances tubes—part 1: method using standing wave ratio (ISO 10534-1:1996) (Standard No. EN ISO 10534-1:2001). Brussels, Belgium: CEN; 2001.
• 3.European Committee for Standardization (CEN). Acoustics—determination of sound absorption coefficient and impedance in impedances tubes—part 2: transfer-function method (ISO 10534-2:1998) (Standard No. EN ISO 10534-2:2001). Brussels, Belgium: CEN; 2001.
• 4.Nocke C. In-situ acoustic impedance measurement using a free-field transfer function method. Appl Acoust. 2000;59:253–64.
• 5.Mommertz E. Angle-dependent in-situ measurement of reflection coefficients using a subtraction technique. Appl Acoust. 1995;46(3):251–63.
• 6.Batko W, Dąbrowski Z, Engel Z, Kiciński J, Weyna S. Nowoczesne metody badania procesów wibroakustycznych cz. I [Modern methods of studying vibroacoustic processes part I]. Radom, Poland: ITE-PIB; 2005. In Polish.
• 7.Engel Z, Piechowicz J, Stryczniewicz L. Podstawy wibroakustyki przemysłowej [The principles of industrial vibroacoustics]. Kraków, Poland: WIMiR AGH; 2003.
• 8.Piechowicz J. Determination of the sound power of a machine inside an industrial room by the inversion method. Arch Acoust. 2009;34(2):169–76.
• 9.Batko W, Dąbrowski Z, Engel Z, Kiciński J, Weyna S. Nowoczesne metody badania procesów wibroakustycznych cz. I [Modern methods of studying vibroacoustic processes part I]. Radom, Poland: ITE-PIB; 2005. In Polish.
• 10.Nava GP, Yasuda Y, Sakamoto S. On the situ estimation of surface acoustic impedance in interiors of arbitrary shape by acoustical inverse methods. Acoust Sci & Tech. 2009;30(2):100–9.