title: Aperiodicity effects on sound transmission through arrays of identical cylinders perpendicular to the ground.
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.
authors.affiliation: Department of Design, Development, Environment, and Materials, The Open University, Milton Keynes MK7 6AA, United Kingdom. s.taherzadeh@open.ac.uk
authors.forename: Shahram
authors.initials: S
authors.lastname: Taherzadeh
authors.forename: Imran
authors.initials: I
authors.lastname: Bashir
authors.forename: Keith
authors.initials: K
authors.lastname: Attenborough
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D004548:Elasticity; D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D009622:Noise / Q000517:prevention & control; D011143:Polyvinyl Chloride; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013499:Surface Properties; D013997:Time Factors
chemical_list: D011143:Polyvinyl Chloride