Parameters Influencing the Focalization Produced by a Graded Phononic Crystal
Journal Title: Romanian Journal of Acoustics and Vibration - Year 2014, Vol 11, Issue 1
Abstract
The geometrical distribution of immersed tubes has considerable influence on the propagation of an incident plane acoustic wave. A periodic distribution represents a phononic crystal (PC), which can be perfectly transparent or opaque at certain frequency ranges, called pass-bands and stop-bands respectively. If the periodicity is slightly perturbed, a graded phononic crystal (GPC) is obtained. Some selected graded phononic crystals having a linear variation of tube wall thickness from row to row, can produce wave focalization. The spacing between rows is however constant. The influence of this spacing, as well as the distance between rows, on the focalization point location and on the local acoustic pressure maxima are determined. A second analysis concerns the interlaced rows, in which the tubes of any two neighboring rows are placed in rhomboidal shapes. The variation of distances between tubes is correlated with focalization parameters.
Authors and Affiliations
MIHAI PREDOI, HERVÉ FRANKLIN, OLIVIER LENOIR, KUN ZONG
Keywords
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