Sensitivity Analysis of Acoustic Field Parameters on a Change of Boundary Conditions in a Room

• Autorzy: Suder-Dębska K. , Czajka I. , Czechowski M.

Identyfikatory

DOI

10.2478/aoa-2014-0039

• Języki publikacji: EN

Abstrakty

EN

The area of environmental protection concern minimises the impact that technical objects have on the environment. Usually the most effective way of protecting the environment is to influence the source of the problem. For this reason studies are conducted to modify the construction of machines, power machines in particular, so as to minimise their impact on the environment. In the case of environmental protection from noise it is most convenient to carry out measurements in an anechoic chamber. Unfortunately, this is possible only in very limited circumstances. In all other cases measurements are performed using an engineering method or the survey method, both of which are described in the standards and by taking into account the so-called environmental corrections. The obtained results are burdened with greater error than those of measurements in an anechoic chamber. Therefore, it would seem advantageous to develop a method of obtaining similar and reliable results as those in an anechoic chamber, but in a reverberant field. The authors decided to use numerical modelling for this purpose. The main objective of this work is a comprehensive analysis of the numerical model of a laboratory designed for acoustic tests of selected power machines. The geometry of a room comprising an area of analysis is easy to design. The main difficulty in modelling the phenomena occurring in the analysed area can be the lack of knowing the boundary conditions. Therefore, the authors made an attempt to analyse the sensitivity of various acoustic parameters in a room in order to change these boundary conditions depending on the sound absorption coefficient.

Słowa kluczowe

EN

sensitivity analysis; acoustic parameter; geometrical method; sound absorption coefficient; noise of power machines

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2014
• Tom: Vol. 39, No. 3
• Strony: 343--350
• Opis fizyczny: Bibliogr. 12 poz., wykr.

Twórcy

autor

Suder-Dębska K.

• AGH University of Science and Technology al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Czajka I.

• AGH University of Science and Technology al. A. Mickiewicza 30, 30-059 Kraków, Poland

autor

Czechowski M.

• AGH University of Science and Technology al. A. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

• 1. GOŁAŚ A., SUDER-DĘBSKA K. (2009), Analysis of dome home hall theatre acoustic field, Archives of Acoustics, 34, 3, 273-293.
• 2. KULOWSKI A. (2007), Room acoustics, [in Polish: Akustyka sal], Wydawnictwo Politechniki Gdańskiej, Gdańsk.
• 3. KUTTRUFF H. (2009), Room Acoustics, Spon Press, London-New York.
• 4. MECHEL F.P. (2008), Formulas of Acoustics, Springer Verlag, Berlin-Heidelberg-New York.
• 5. PIECHOWICZ J. (2009), Determination of the sound power of a machine inside an industrial room by the inversion method, Archives of Acoustics, 34, 2, 169¬176.
• 6. PIECHOWICZ J., CZAJKA I. (2012), Estimation of acoustic impedance for surfaces delimiting the volume of an enclosed space, Archives of Acoustics, 37, 1, 97¬102.
• 7. SALTELLI A., TARANTOLA S., CAMPOLONGO F., RATTO M. (2004), Sensitivity Analysis in Practice, John Wiley & Sons, Chichester, England.
• 8. Standard ISO 3744:2011, Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essentially free field over a reflecting plane.
• 9. Standard ISO 3745:2012, Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pessure - Precision methods for anechoic rooms and hemi-anechoic rooms.
• 10. Standard ISO 3746:1995, Acoustics - Determination of sound power levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane.
• 11. Standard ISO 11690-3:2002, Recommended practice for the design of low-noise workplaces containing machinery - Part 3: Sound propagation and noise prediction in workrooms.
• 12. Regulation of the Minister of the Environment of 14 June 2007 on permissible noise levels in the environment, (Dz. U. z 2007 r. Nr 120, poz. 826).