title: Hybrid phononic crystals for broad-band frequency noise control by sound blocking and localization.
abstract: A bandgap cannot be enlarged sufficiently enough to suppress a broad-band noise only with a single type of finite-length phononic crystals. Here, a hybrid phononic crystal consisting of a bi-prism and an inverted bi-prism is proposed for noise control in a broad band; a stop band is formed in a central frequency range while positive-positive and positive-negative refractions occur in lower and higher frequency ranges to concentrate acoustic energy in a central localized zone. Thereby, the remaining zone becomes little affected by the noise. Analysis and numerical simulations are given for the justification of the proposed configuration.
authors.affiliation: School of Mechanical and Aerospace Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea. novalisg@snu.ac.kr
authors.forename: Sungmin
authors.initials: S
authors.lastname: Yoo
authors.forename: Yoon Jae
authors.initials: YJ
authors.lastname: Kim
authors.forename: Yoon Young
authors.initials: YY
authors.lastname: Kim
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D004867:Equipment Design; D020342:Finite Element Analysis; D008962:Models, Theoretical; D009622:Noise / Q000517:prevention & control*; D009716:Numerical Analysis, Computer-Assisted; D011312:Pressure