Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/34581
Title: | On the potential of meta-poro-elastic systems with mass inclusions to achieve broadband near-perfect absorption coefficient | Authors: | Ahsani, S Boukadia, R. F. Droz, C. Zielinski, T. G Jankowski, L Claeys, C Desmet, W DECKERS, Elke |
Issue Date: | 2020 | Source: | PROCEEDINGS OF INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION ENGINEERING (ISMA2020) / INTERNATIONAL CONFERENCE ON UNCERTAINTY IN STRUCTURAL DYNAMICS (USD2020), p. 2463 -2472 | Abstract: | This paper discusses the potential of meta-poro-elastic systems with small mass inclusions to create broadband sound absorption performance under the quarter-wavelength limit. A first feasibility study is done to evaluate whether embedding small mass inclusions in specific types of foam can lead to near-perfect absorption at tuned frequencies. This paper includes an optimization routine to find the material properties that maximize the losses due to the mass inclusion such that a near-perfect/perfect absorption coefficient can be achieved at specified frequencies. The near-perfect absorption is due to the mass-spring effect, which leads to an increase in the viscous loss. Therefore, it is efficient in the viscous regime. The well-known critical frequency, which depends on the porosity and flow resistivity of the material, is commonly used as a criteria to distinguish the viscous regime from the inertial regime. However, for the types of foam of interest to this work, the value of critical frequency is below the mass-spring resonance frequency. Hence, the inverse quality factor is used to provides a more accurate estimation on the frequency at which the transition from the viscous regime to the inertial regime. | Document URI: | http://hdl.handle.net/1942/34581 | ISBN: | 978-90-828931-1-3 | ISI #: | WOS:000652006003014 | Category: | C1 | Type: | Proceedings Paper |
Appears in Collections: | Research publications |
Show full item record
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.