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On the acoustic black-hole effect in waveguides
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för datavetenskap.ORCID-id: 0000-0003-0473-3263
Department of Mathematics and Computer Science, Karlstad University, Karlstad, Sweden.ORCID-id: 0000-0001-8704-9584
2021 (engelsk)Inngår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 149, nr 4, artikkel-id A108Artikkel i tidsskrift, Meeting abstract (Fagfellevurdert) Published
Abstract [en]

The acoustic black-hole (ABH) effect is a well-known way of controlling structural vibrations in solid beams and plates. The theory behind this effect is to reduce the velocity of waves by altering the physical properties of the domain according to a power-law profile. For an ideal ABH, this leads to vanishing reflections from the end of the termination. In practice, there will be a truncation in the profile, which leads to some reflections. A well-known way of minimizing this truncation error is to add damping material to the end of the ABH termination.

For a waveguide embedding a set of rings with retarding inner radius according to a power-law profile, the velocity of sound waves tends to zero. However, unlike the structural counterpart, experimental results in the literature show that adding damping material to reduce the truncation error is not effective for waveguides. Here, we present a finite element simulation of the considered cylindrical setup. Our results confirm that the addition of damping material to the end of the waveguide is ineffective while suggesting that the local absorption effects at the lateral surface of the cylinder are a primary source of damping to achieve the ABH effect.

sted, utgiver, år, opplag, sider
Acoustical Society of America (ASA), 2021. Vol. 149, nr 4, artikkel-id A108
Emneord [en]
Acoustic black-hole, finite element method, acoustic waveguide
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-189729DOI: 10.1121/10.0004664OAI: oai:DiVA.org:umu-189729DiVA, id: diva2:1612909
Konferanse
ASA 2021, The 180th Meeting of the Acoustical Society of America, Acoustics in Focus, Virtual, June 8-10, 2021
Tilgjengelig fra: 2021-11-19 Laget: 2021-11-19 Sist oppdatert: 2021-11-22bibliografisk kontrollert

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