Experimental methodology for obtaining sound absorption coefficients
DOI:
https://doi.org/10.17533/udea.rfnsp.5120Keywords:
noise, sound, absorption coefficient, attenuation, genetic algorithmsAbstract
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.
Downloads
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.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2021 Hernán D. Sepúlveda D., Carlos A. Macía M.

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
The contents of the articles are the responsibility of the authors
The editorial committee has editorial independence from the National School of Public Health "Héctor Abad Gómez" of the University of Antioquia.
The editorial committee is not responsible for aspects related to copying, plagiarism or fraud that may appear in the articles published in it.
When you are going to reproduce and disclose photographs or personal data in printed or digital format, informed consent is required. Therefore, this requirement is required of the author at the time of receipt of the manuscript.
Authors are responsible for obtaining the necessary permissions to reproduce any material protected by reproduction rights.
The authors preserve the moral rights and assign the economic rights that will correspond to the University of Antioquia, to publish it, distribute electronic copies, include them in indexing services, directories or national and international databases in Open Access, under the Creative Commons Attribution license -Not Commercial-Share Equal 4.0 International Commercial (CC BY-NC-SA) which allows others to distribute, remix, retouch, and create from the work in a non-commercial way, as long as the respective credit and license are granted. new creations under the same conditions.
The authors will sign the declaration of transfer of economic rights to the University of Antioquia, after the acceptance of the manuscript.
The editorial committee reserves the right to reject the articles whose authors do not offer satisfactory explanations about the contribution of each author, to meet the criteria of authorship in the submission letter. All authors must meet the four criteria of authorship according to ICMJE: "a) .- That there is a substantial contribution to the conception or design of the article or to the acquisition, analysis or interpretation of the data. b) That they have participated in the design of the research work or in the critical review of its intellectual content. c) .- That has been intervened in the approval of the final version that will be published.d). That they have the capacity to respond to all aspects of the article in order to ensure that issues related to the accuracy or integrity of any part of the work are adequately investigated and resolved. "