Taherzadeh, Shahram; Bashir, Imran and Attenborough, Keith
Aperiodicity effects on sound transmission through arrays of identical cylinders perpendicular to the ground.
Journal of the Acoustical Society of America, 132(4)
Results of laboratory measurements of sound transmission through 5 × 10 arrays of meter long polyvinyl chloride pipes with lattice constants of 5 and 10 cm with filling fractions of 13% and 50% located either on medium density fibreboard or a layer of felt are reported. Ground effects and sonic crystal effects are found to be additive. Measurements and predictions show that, while there is little broadband advantage in a periodic configuration compared with a random one, a quasi-periodic arrangement in which the perturbation has a standard deviation equal to the scatterer diameter gives the best overall attenuation.
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