In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 104, No. 3_Supplement ( 1998-09-01), p. 1744-1744
Abstract:
Here, it is shown, for the first time, a systematic analysis (experiment and theory) of the acoustic transmission of a two-dimensional periodic array of rigid cylinders with two different configurations: square and triangular. The influence of the filling fractions, ranging from 0.06 up to 0.41, on the appearance of the pseudogaps and full band gaps is studied. Above a certain filling fraction, an overlap is observed between the attenuation peaks measured along the two high symmetry directions of the Brillouin zone. This effect is considered as the fingerprint of the existence of a full acoustic gap. Nevertheless, the comparison with our calculation of band structures shows that the lattice has band states in that frequency range. These bands are called deaf bands (i.e., they cannot be excited by experiments of sound transmission) [Sanchez-Perez et al., Phys. Rev. Lett. (to be published)].
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1998
detail.hit.zdb_id:
1461063-2
detail.hit.zdb_id:
219231-7
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