Ultrasonic transmission experiments on porous materials

• Autorzy: Kelders L. , Lauriks W. , Thoen J.
• Konferencja: International Symposium on HYDROACOUSTICS AND ULTRASONICS EAA Symposium (formerly 13th FASE Symposium) Gdańsk-Jurata, 12-16 May 1997
• Języki publikacji: EN

Abstrakty

EN

The experiments are based on the detection of air-borne slow compressional waves after transmission through absorbent porous materials. The measurement of the attenuation and the velocity of the slow wave at ultrasonic frequencies enables us to determine some important material parameters which are needed for the prediction of the acoustic performance (in the audible range) of the samples. In addition, an XY positioning system is useful for probing the samples at different positions. The difference in velocity and attenuation as a function of the measuring point on the sample gives information on the homogeneity of the material. This leads to non-destructive testing and to a study of the difference in material properties within one sample.

• Wydawca: Polskie Towarzystwo Akustyczne. Oddział Gdański
• Czasopismo: Hydroacoustics
• Rocznik: 1997
• Tom: Vol. 1
• Strony: 307--310
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Kelders L.

• Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde Katholieke Universiteit Leuven Celestijnenlaan 200D B-3001 Leuven Belgium

autor

Lauriks W.

• Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde Katholieke Universiteit Leuven Celestijnenlaan 200D B-3001 Leuven Belgium

autor

Thoen J.

• Laboratorium voor Akoestiek en Thermische Fysica Departement Natuurkunde Katholieke Universiteit Leuven Celestijnenlaan 200D B-3001 Leuven Belgium

Bibliografia

• [1] M.A. Biot, (1956), Theory of propagation of elastie waves in a fluid-saturared porous solid, J. Acoust. Soc. Am., 28, 168 - 191
• [2] J.F. Allard, (1994), Sound propagation in porous media : Modeling sound absorbing materials, EIsevier, New York
• [3] r.r. Allard, B. Castagnede, M. Henry, W. Lauriks, (1994), Evaluation of tortuosity in acoustic porous materials saturated by air, Rev. Sci. Instrum., 65 (3), 754 - 755
• [4] D.L. Johnson, J. Koplik, R. Dashen, (1987), Theory of dynamic permeability and tortuosity in fluid-saturated porous media, J. Fluid. Mech., 176, 379 - 402
• [5] Y. Champoux, J.F. Allard, (1991), Dynamic tortuosity and bulk modulus in air-saturated porous media, J. ApI. Phys., 70 (4), 1975 - 1979
• [6] P. Leclaire, L. Kelders, W. Lauriks, C. Glorieux, J. Thoen, (1996), Determination of the viseous characteristic length in air-filled porous materials by ultrasonic attenuation measurements, J. Acoust. Soc. Am., 99(4), 1944 - 1948
• [7] Ph. Leclaire, L. Kelders, W. Lauriks, M. Melon, N. Brown, B. Castagnede, (1996), Determination of the viscous and thermal characteristic lengths of plastic foams by ultrasonic measurements in heli um and air, J. AppI. Phys., 80 (4), 2009 - 2012
• [8] Ph. Leelaire, L. Kelders, W. Lauriks, J.F. Allard, C. Glorieux, (1996), Ultrasonic wave propagation in reticulated foams saturated by different gases : High frequency limit of the classical models, Appl. Phys. Lett., 69 (18), 2641 - 2643