Metodología experimental para obtener coeficientes de absorción de ruido

objective: a new methodology designed to obtain sound absorption coefficients using genetic algorithms is proposed. methodology: sound waves are generated and conducted along a rectangular silencer and attenuated by the absorbing material covering its walls. taking the sound pressure level related to attenuation, a search is developed to find parameters of the proposed attenuation expressions including geometric factors, wavelength and absorption coefficient. results: a variety of adjusted mathematical models were found capable of estimating the absorption coefficients based on the characteristics of a rectangular silencer used to measure attenuation. conclusions: this methodology allows to obtain in a simple and low-cost way absorption coefficients for new materials, provided it may slightly differ from those obtained by means of other methods, but admitting that it can also provide solutions within a certain range of accuracy in applied engineering for the design of noise control systems.