Applied Acoustics 139 (2018) 203–212 Contents lists available at ScienceDirect Applied Acoustics journal homepage: www.elsevier.com/locate/apacoust An impedance tube submerged in a liquid for the low-frequency ☆,☆☆ transmission-loss measurement of a porous material a a b, Miša Oblak , Miha Pirnat , Miha Boltežar Kolektor Etra d.o.o., Šlandrova 10, 1231 Ljubljana, Slovenia Faculty of Mechanical Engineering, Aškerčeva 6, 1000 Ljubljana, Slovenia ARTIC L E I NF O ABSTRAC T Keywords: According to the standard ASTM E2611 an impedance tube can be used to measure the sound transmission and Impedance tube reﬂection losses in an absorption material. However, application in a liquid medium in the low-frequency range Metal foam presents diﬃculties with respect to the size of the structure and the waveguide-related distortion of the plane- Low frequency wave propagation. In this paper a four-microphone impedance tube for use in liquids in the low-frequency range, Waveguide complying with the transfer-matrix method for transmission-loss measurements, is presented. The impedance Attenuation tube is validated on the basis of research on an underwater, two-microphone impedance tube. It is demonstrated Phase velocity that in the low-frequency range the loudspeaker couples well into the plane-wave propagation. Furthermore, existing methods for measuring the group velocity and the
Applied Acoustics – Elsevier
Published: Oct 1, 2018
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