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Tuesday, July 9 • 16:10 - 16:30
[NO-SHOW] Broadband forbidden transmission by multiple CPA-based detuned Helmholtz resonators

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The present study investigates acoustic wave propagation characteristics in a duct loaded with multiple Helmholtz resonators (HRs) in the presence of the dissipative effect, focusing on sound absorption and transmission. The analytical investigations are conducted using the transfer matrix method. Acoustic coupling of two detuned resonators is systematically investigated. Special attention is devoted to the coherent perfect absorption (CPA) induced by two asymmetric, slightly detuned resonators. It is found that a transmission forbidden band is formed when CPA occurs, within which acoustic transmission is completely forbidden. Moreover, the band is insensitive to the separation of resonators, which offers a potential to build a compact system with wide transmission forbidden bandwidth. Inspired by this finding, we propose a compact and broadband CPA-based transmission forbidden system, composed of multiple detuned HRs, in which the geometric parameters of each two adjacent resonators satisfy the CPA condition and the resonators are closely placed. By overlapping the forbidden band of each two adjacent resonators, the width of the forbidden band is broadened significantly. The proposed compact system shows promise for duct noise control in practical applications.


Hans Boden

Professor, KTH


Tuesday July 9, 2019 16:10 - 16:30 EDT
Westmount 1