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) EL323-EL328.
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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