Experimental methodology for obtaining sound absorption coefficients

Authors

  • Hernán D. Sepúlveda D. University of Antioquia
  • Carlos A. Macía M.

DOI:

https://doi.org/10.17533/udea.rfnsp.5120

Keywords:

noise, sound, absorption coefficient, attenuation, genetic algorithms

Abstract

Objective: the authors propose a new methodology for estimating sound absorption coefficients using genetic algorithms. Methodology: sound waves are generated and conducted along a rectangular silencer. The waves are then attenuated by the absorbing material covering the silencer’s walls. The attenuated sound pressure level is used in a genetic algorithm-based search to find the parameters of the proposed attenuation expressions that include geometric factors, the wavelength and the absorption coefficient. Results: a variety of adjusted mathematical models were found that make it possible to estimate the absorption coefficients based on the characteristics of a rectangular silencer used for measuring the attenuation of the noise that passes through it. Conclusions: this methodology makes it possible to obtain the absorption coefficients of new materials in a cheap and simple manner. Although these coefficients might be slightly different from those obtained through other methodologies, they provide solutions within the engineering accuracy ranges that are used for designing noise control systems.

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Author Biographies

Hernán D. Sepúlveda D., University of Antioquia

Chemical Engineer, Master in Occupational Health, Occupational Health Development Group (GIDSO) of the National School of Public Health, University of Antioquia, Medellín, Colombia.

Carlos A. Macía M.

Master in occupational health; engineer in environmental evaluation and control, Medellín, Colombia.

References

(1). Harris M. Manual de medidas acústicas y control de ruido. 3.ª ed. Madrid: Mc Graw Hill; 1993.

(2). Jaramillo A. Acustica: La ciencia del sonido. Medellin: Fondo editorial itm; 2007.

(3). Ballagh KO. Acoustical Properties of Wool. Appkd Acoustics [revista en internet] 1996 [acceso 13 de agosto de 2009]; 48(2). Disponible en: http://www.sciencedirect.com/science/article/pii/0003682X95000428. DOI: https://doi.org/10.1016/0003-682X(95)00042-8

(4). Puerta J, Quinchía R. Evaluación y control de ruido industrial. Medellín: IngeAire; 1991

(5). ISOVER. Manual de aislamiento en la industria. [internet] [ac-ceso 12 de abril de 2009]. Disponible en: http://www.ingenieroambiental.com/4006/Acustica%20Edificio%20-%20Manual%20Aislamiento%20Industrial%20Isover.pdf

(6). Fundación Mapfre. Manual de Higiene Industrial. 3ª ed. Madrid: Mapfre; 1991.

(7). ASTM. Standard Test Method for Impedance and Absorption of Acoustical Materials by Impedance Tube Method. [inter-net] [acceso 08 de septiembre de 2009]. Disponible en: http://www.astm.org/Standards/C384.htm.

(8). Castañeda JA, González HA. Medición del coeficiente de absorción del sonido. Scientia et Técnica Año X [revista en internet] 2004 Agosto. [acceso 12 de abril de 2009] 25(1) .Disponible en http://www.utp.edu.co/php/revistas/ScientiaEtTechnica/docs-FTP/162112101-106.pdf.

(9). Famighetti T. Investigations into the performance of the reverberation chamber of the integrated acoustics laboratory. [Trabajo de grado en internet] [acceso 10 de Marzo de 2009] Georgia: Georgia Institute of Technology; 2005. Disponible en: http://etd.gatech.edu/theses/available/etd-04022005-223652/unrestricted/famighetti_tina_m_200505_mast.pdf.

(10). National Instruments. “Acoustic test chambers and environments”. [internet] [acceso 15 de enero de 2009]. Disponible en: http://zone.ni.com/devzone/nidzgloss.nsf/webmain/62E64F4028A2D77C862568C6005E4B84?OpenDocument.

(11). Bobgolds. Fiberglass, Rockwool, Polyester, Cotton, and Sheep Absorption Coefficients. [internet] [acceso 15 de Agosto de 2009]. Disponible en: http://www.bobgolds.com/AbsorptionCo-efficients.htm.

(12). Rodríguez M, Simón F, Pfretzschner J. Optimización de las cara-cterísticas absorbentes de materiales granulados reciclados. Instituto de acústica. [internet] [acceso 12 de Abril de 2009]. Disponi-ble en http://www.ia.csic.es/Sea/publicaciones/4320gp003.pdf.

(13). Skinner C, Peters J, Vandenbroeck J. Acoustic Absorbers: A third way for the management of sound in automobiles. Paper for uechEurope. [revista en internet] 2006 marzo [acceso 15 de agosto de 2009]. Disponible en: http://www.huntsman.com/pu/Media/UTECH2006_Acoustic_Materials.pdf.

(14). Barnard AR, Rao MD. A Comparison of Acoustic Absorption Coefficient Measurements from the In-Situ Method with Tradi-tional Methods. [internet] [acceso 20 de marzo de 2009]. Dis-ponible en: http://www.me.mtu.edu/courses/meem4704/project/papers/nc04_insitu_method.pdf.

(15). Giese F, Ries H, Eigenbrod C. On the Performance of Porous Sound Absorbent Material in High Temperature Applications. Journal of Engineering for Gas Turbines and Power [revista en internet]. December 2010 [acceso 12 de abril de 2009] 132(12). Disponible en: http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000132000012121301000001&idtype=cvips&gifs=yes&ref=no. DOI: https://doi.org/10.1115/1.4001823

(16). Glé P, Gourdon E, Arnaud L. Acoustical properties of materials made of vegetable particles with several scales of porosity Applied Acoustics [revista en internet]. 2011 [acceso 16 de mayo de 2009] 72. Disponible en: http://cat.inist.fr/?aModele=afficheN&cpsidt=23933212. DOI: https://doi.org/10.1016/j.apacoust.2010.11.003

(17). Holland J. Genetics Algorithms. [internet] [acceso 3 de Junio de 2009]. Disponible en http://www.econ.iastate.edu/tesfatsi/holland.GAIntro.htm.

(18). Mitchell M. An introduction to genetic algorithms. usa: Massa-chusets Institute of Technology Press; 1998.

(19). Koza J. Genetic programming: on the programming of comput-ers by mean of natural selection. usa: Massachusets Institute of Technology Press; 1992.

Published

2011-10-10

How to Cite

1.
Sepúlveda D. HD, Macía M. CA. Experimental methodology for obtaining sound absorption coefficients. Rev. Fac. Nac. Salud Pública [Internet]. 2011 Oct. 10 [cited 2025 Feb. 27];29(2):129-38. Available from: https://revistas.udea.edu.co/index.php/fnsp/article/view/5120

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