Journal article
3D shape optimization of loudspeaker cabinets for uniform directivity
Department of Electrical and Photonics Engineering, Technical University of Denmark1
Acoustic Technology, Department of Electrical and Photonics Engineering, Technical University of Denmark2
Department of Civil and Mechanical Engineering, Technical University of Denmark3
Solid Mechanics, Department of Civil and Mechanical Engineering, Technical University of Denmark4
GN Audio A/S5
This paper presents a method to perform gradient-based shape optimization to minimize the root mean square deviation of the exterior acoustic sound pressure level distribution in front of an initially spherically shaped loudspeaker. The work includes several examples of how different multi-frequency optimization strategies can affect the final optimized design performance.
This includes testing, averaging, and weighting of multi-frequency cost functions or using a minimax formulation. The shape optimization technique is based on an acoustic Boundary Element Method coupled to a Lumped Parameter loudspeaker model. To control and alter the deformation of the loudspeaker cabinet the optimization method adapts a spherical free-form deformation approach based on Bernstein polynomials.
For the particular optimization problems presented, it is shown that improvements in the root mean square deviation of the sound pressure level in front of the loudspeaker can be achieved between 1 and 5 kHz. In the best-case scenario, less than a 1 dB sound pressure level (SPL) variation is observed between on-axis and a 70° off-axis response in the range 2 to 5 kHz.
The widest frequency bandwidth and smoothest response of the root mean square deviation is found by utilizing the minimax formulation.
Language: | English |
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Publisher: | Springer Berlin Heidelberg |
Year: | 2022 |
ISSN: | 16151488 and 1615147x |
Types: | Journal article |
DOI: | 10.1007/s00158-022-03451-2 |
ORCIDs: | Andersen, Peter Risby , Cutanda Henríquez, Vicente , Aage, Niels and 0000-0002-4342-1871 |