Optimization of the Performance of Small Speaker Systems with Passive Radiators

Daniel Gert Nielsen, Gyeong-Tae Lee, Yong-Hwa Park, Jakob Søndergaard Jensen, Finn T. Agerkvist

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Abstract

Small transportable Bluetooth- and smart/AI speakers are becoming an increasing part of many households. Due to their small size, these speakers have limited output at low frequencies, and typically have a vented port or in some cases a passive radiator to improve the low-frequency performance. In this work, we show how a density based material optimization approach can be used to optimize the frequency response of the system. The passive radiator is placed at the top of a cylinder with a down-firing speaker, driven with a voltage source, which, via a lumped model, is connected to a multi-physics finite element framework. The speaker radiates sound into an unbounded domain, which is realized by using perfectly matched layers. The performance of the speaker is based on a numerical measurement 1 meter away from the speaker. Several optimization results are shown and these are compared with a more generic type of small speaker system.
Original languageEnglish
Title of host publicationProceedings of 49th International Congress and Exposition on Noise Control Engineering
PublisherInstitute of Noise Control Engineering
Publication date2021
Pages5779-5790
Publication statusPublished - 2021
Event49th International Congress and Exposition on Noise Control Engineering - Virtual event, Seoul, Korea, Republic of
Duration: 23 Aug 202026 Aug 2020
https://internoise2020.org/

Conference

Conference49th International Congress and Exposition on Noise Control Engineering
LocationVirtual event
Country/TerritoryKorea, Republic of
CitySeoul
Period23/08/202026/08/2020
Internet address
SeriesInter-Noise Proceedings
Volume261

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