Design of acoustic partitions with thin plate-like acoustic metamaterials

Langfeldt, Felix and Gleine, Wolfgang (2019) Design of acoustic partitions with thin plate-like acoustic metamaterials. Ochmann, Martin, Michael, Vorlander and Fels, Janina (eds.) In Proceedings of the 23rd International Congress on Acoustics. vol. 2019-September, International Commission for Acoustics. pp. 4870-4877 . (doi:10.18154/RWTH-CONV-239261).

Abstract

Acoustic metamaterials have emerged as new means for sound control with extraordinary properties, such as negative effective density and/or bulk modulus. Amongst the variety of different realizations of acoustic metamaterials, thin plate-like metamaterials (e.g. membrane-type acoustic metamaterials or inhomogeneous plates) have a high potential for improving the sound transmission loss of conventional partitions, especially in the challenging low-frequency regime. These types of metamaterials have been previously shown to achieve very high sound transmission loss values which can exceed the corresponding mass-law values considerably. However, further investigations have shown that when these metamaterials are integrated into a double wall partition, the beneficial effect of the metamaterials can be greatly diminished if an improper design is chosen. This contribution aims at providing a more detailed understanding of the important parameters in the design of acoustic partitions with thin plate-like acoustic metamaterials. The metamaterial is represented by a simple black-box model in order to reduce the parameter space. Analytical calculations of combinations of the metamaterial with single and double walls are used to identify the most relevant design parameters and possible limitations in the acoustic performance. General design guidelines for acoustic partitions are derived from these results and applied to laboratory test samples.

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Contributors

Author: Felix Langfeldt

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