Conference paper
Optimization of the Performance of Small Speaker Systems with Passive Radiators
Department of Electrical Engineering, Technical University of Denmark1
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark2
Korea Advanced Institute of Science and Technology3
Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark4
Department of Mechanical Engineering, Technical University of Denmark5
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.
| Language: | English |
|---|---|
| Publisher: | Institute of Noise Control Engineering |
| Year: | 2021 |
| Pages: | 5779-5790 |
| Proceedings: | 49<sup>th</sup> International Congress and Exposition on Noise Control EngineeringInter-Noise |
| Series: | Inter-noise Proceedings |
| Types: | Conference paper |
| ORCIDs: | Nielsen, Daniel Gert , Jensen, Jakob Søndergaard and Agerkvist, Finn T. |
