title: Diffusive benefits of cylinders in front of a Schroeder diffuser.
abstract: A numerical investigation is performed into the diffusive effects of cylinders positioned in front of a Schroeder diffuser. A regular line of cylinders is shown to offer notable improvements to diffusion from a periodic Schroeder device, provided lateral cylinder spacing is incommensurable with the Schroeder period width. Further investigation considers angular dependence and low frequency results in greater detail, as well as the effects on narrowband and modulated Schroeder devices. An optimization procedure is subsequently performed to investigate the effects of an irregular cylinder arrangement, which provides further diffusive benefits.
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom. markpogson@gmail.com
authors.forename: M A
authors.initials: MA
authors.lastname: Pogson
authors.forename: D M
authors.initials: DM
authors.lastname: Whittaker
authors.forename: G A
authors.initials: GA
authors.lastname: Gehring
authors.forename: T J
authors.initials: TJ
authors.lastname: Cox
authors.forename: R J
authors.initials: RJ
authors.lastname: Hughes
authors.forename: J A S
authors.initials: JA
authors.lastname: Angus
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004058:Diffusion; D004867:Equipment Design; D005160:Facility Design and Construction; D008962:Models, Theoretical; D009716:Numerical Analysis, Computer-Assisted; D013016:Sound