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Sound vibration damping optimization with application to the design of speakerphone casings
Umeå University, Faculty of Science and Technology, Department of Computing Science.ORCID iD: 0000-0003-0473-3263
Umeå University, Faculty of Science and Technology, Department of Computing Science.
2013 (English)In: : Paper id 5569, 2013Conference paper, Published paper (Refereed)
Abstract [en]

We optimize the thickness distribution in a 1D beam model of an elastic plate, subject to forced vibration at one of its ends, in order to minimize the structural vibration in a given area of the plate. The optimization is carried out both in broadband and band-pass cases. Geometric constraints, weight constraints, and constraints on the static compliance are imposed in the optimization. A broadband optimization over 50 frequencies, evenly distributed in the 300–3400 Hz range, reduces the vibration by around 5–10 dB on average throughout the frequency range. When targeting only the higher end of the above frequency range, it is possible to achieve more dramatic results. Vibration reductions of 20 dB and more can be achieved in the 2300–2800 Hz region. In the latter case, the results suggest that a band-gap phenomenon occurs, similarly as for phononic band gap materials. To validate the results, the best-performing optimal shape for the clamped case was imported into a 3D computational structural model, and the resulting forced vibration response agreed well with the the beam-model computations. These results were first announced in a technical report by Lacis et al. [5].

Place, publisher, year, edition, pages
2013.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:umu:diva-133488OAI: oai:DiVA.org:umu-133488DiVA, id: diva2:1087894
Conference
10th World Congress of Structural and Multidisciplinary Optimization, Orlando, Florida, USA, May 19-24, 2013
Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2019-06-19Bibliographically approved

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Berggren, MartinWadbro, Eddie

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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Output format
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