Numerical Methodology to Obtain the Sound Absorption of Materials by Inserting the Acoustic Impedance

• Autorzy: Borges Mendes Cláudia Ohana , De Araújo Nunes Maria Alzira

Identyfikatory

DOI

10.24425/aoa.2021.139641

• Języki publikacji: EN

Abstrakty

EN

Numerical models allow structural characteristics to be obtained by solving mathematical formulations. The sound absorption capacity of a material can be acquired by numerically simulating an impedance tube and using the method governed by ISO 10534-2. This study presents a procedure of obtaining sound pressure using two microphones and as outline condition, at one end of the tube, the impedance of fiber samples extracted from the pseudostem of banana plants. The numerical methodology was conducted in the ANSYS® Workbench software. The sound absorption coefficient was obtained in the MATLAB® software using as input data the sound pressure captured in the microphones and applying the mathematical formulations exposed in this study. For the validation of the numerical model, the results were compared with the sound absorption coefficients of the fiber sample collected from an experimental procedure and also with the results of a microperforated panel developed by Maa (1998). According to the results, the methodology presented in this study showed effective results, since the largest absolute and relative errors were 0.001 and 3.162%, respectively.

Słowa kluczowe

EN

impedance tube; ANSYSRO; finite element method; sound absorption

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2021
• Tom: Vol. 46, No. 4
• Strony: 649--656
• Opis fizyczny: Bibliogr. 14 poz., rys., tab., wykr.

Twórcy

autor

Borges Mendes Cláudia Ohana

• Graduate Program in Engineering Materials Integrity, University of Brasília-UnB, College UnB Gama-FGA Área Especial de Indústria Projeção A, Setor Leste, CEP:72.444-240, Gama, Distrito Federal, Brazil

autor

De Araújo Nunes Maria Alzira

• Graduate Program in Engineering Materials Integrity, University of Brasília-UnB, College UnB Gama-FGA Área Especial de Indústria Projeção A, Setor Leste, CEP:72.444-240, Gama, Distrito Federal, Brazil

Bibliografia

• 1. ASTM E1050:2019, Standard test method for impedance and absorption of acoustical materials using a tube, two microphones and a digital frequency analysis system.
• 2. ASTM E354:2003, Acoustics - measurement of sound absorption in a reverberation room.
• 3. Bóden H., Abom M. (1986), Influence of erros on the two-microphone method for measuring acoustic properties in ducts, The Journal of the Acoustical Society of America, 79(2): 541-549, doi: 10.1121/1.393542.
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• 6. ISO 10534-1:1996, Acoustic - Determination of sound absorption coefficient and impedance in impedance tubes - Part 1: Method using standing wave ratio.
• 7. ISO 10534-2:1998, Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes. Part 2: Transfer-function method.
• 8. ISO 354:2003, Measurement of sound absorption in a reverberant room.
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