Skip to Content
Merck
  • Aperiodicity effects on sound transmission through arrays of identical cylinders perpendicular to the ground.

Aperiodicity effects on sound transmission through arrays of identical cylinders perpendicular to the ground.

The Journal of the Acoustical Society of America (2012-10-09)
Shahram Taherzadeh, Imran Bashir, Keith Attenborough
ABSTRACT

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.

MATERIALS
Product Number
Brand
Product Description

Supelco
Poly(vinyl chloride), analytical standard, average Mw 85,000 (Typical), average Mn 40,000 (Typical)
Sigma-Aldrich
Poly(vinyl chloride), high molecular weight
Sigma-Aldrich
Poly(vinyl chloride), average Mw ~233,000, average Mn ~99,000
Sigma-Aldrich
Poly(vinyl chloride), average Mw ~43,000, average Mn ~22,000
Supelco
Poly(vinyl chloride), Selectophore, high molecular weight
Sigma-Aldrich
Poly(vinyl chloride), low molecular weight
Sigma-Aldrich
Poly(vinyl chloride), average Mw ~62,000, average Mn ~35,000
Poly(vinyl chloride), European Pharmacopoeia (EP) Reference Standard