Insertion loss spectra for 2D periodic arrays of rigid or elastic cylinders with their axes parallel to a nearby surface

Details Insertion loss spectra for 2D periodic arrays of rigid or elastic cylinders with their axes parallel to a nearby surface Insertion loss spectra for 2D periodic arrays of rigid or elastic cylinders with their axes parallel to a nearby surface

2011-02-15

arxiv.org/abs/1102.3159v2

J. Acoust. Soc. Am. 130 (6), December 2011

Physics

Mathematical Physics

Scientific paper

10.1121/1.3655880

The acoustical performances of regular arrays of cylindrical elements with their axes aligned and parallel to a ground plane have been investigated through predictions and laboratory experiments. Semi-analytical predictions based on multiple scattering theory and numerical simulations based on Boundary Elements formulation have been made. In an anechoic chamber, 7x3 arrays of solid scatterers (hollow PVC cylinders of 55 mm diameter) have been located near to ground planes consisting of Medium Density Fibreboard (MDF) plate or sheets of porous materials. Measurements of Insertion Loss (IL) spectra due to the arrays have been made without and with ground planes for several source and receiver heights. The resulting data have been compared with predictions and numerical simulations. The introduction of a ground plane is shown to have noticeable influences on free field IL spectra. The effects are most adverse when the frequencies of the band gaps coincide with the minima in the excess attenuation spectrum due to the ground alone. On the other hand if the ground effect excess attenuation minimum coincides with an array pass band then it is retained in the insertion loss. Cases are identified where it is possible to obtain an insertion loss with the array in the presence of ground that is greater than that of the same array in the free field.

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