In situ acoustic impedance measurement through microphone arrays and sparsity promoting algorithm
DOI:
https://doi.org/10.55753/aev.v33e50.86Keywords:
acoustic impedance, in situ meaurements, microphone arrays, sparsity promoting algorithmsAbstract
The acoustic behavior of classrooms, theaters, cars and airplanes is of paramount importance and subject to constant improvement. In order to simulate and predict the behavior of these objects or spaces it is necessary to know their geometry and the acoustic impedance of the building materials used. This work aims to characterize the acoustic impedance of construction materials using a microphone array and array processing techniques with sparsity promoting regularization. A computational model was developed to simulate the reflection of a wave by an infinite porous material and to evaluate the viability of the proposed technique. It was verified that the proposed sparsity promoting techniques were able to locate and segregate the direct sound of the reflected sound, for later calculation of the acoustic impedance. The results indicate that the method is viable for high frequencies but presents an overestimation of the impedance values when compared to the theoretical values for medium and low frequencies.
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