Publisher DOI: 10.1121/10.0001925
Title: Optimizing the bandwidth of plate-type acoustic metamaterials
Language: English (United States)
Authors: Langfeldt, Felix 
Gleine, Wolfgang 
Issue Date: 9-Sep-2020
Journal or Series Name: The journal of the Acoustical Society of America 
Volume: 148
Issue: 3
Startpage: 1304
Endpage: 1314
Abstract: 
Plate-type acoustic metamaterials (PAM) consist of a thin film with multiple periodically attached masses. Although these metamaterials can be very lightweight and thin, the resulting sound transmission loss at low frequencies can be much larger than the corresponding mass-law. This is a result of anti-resonances at which the sound transmission through the PAM is strongly reduced. One general challenge, however, is that the anti-resonances are only very narrowband. This makes the application of PAM to noise control problems with broadband noise sources or changing tonal sources difficult. In this contribution, different design strategies to improve the bandwidth of PAM for low-frequency noise control applications (multiple masses per unit cell or stacking multiple PAM layers) are evaluated using optimizations. An efficient modal based model is employed to represent the PAM using their eigenfrequencies and modal masses. The model is validated using simulations and experimental measurements. The optimization results show that it is possible to significantly improve the bandwidth of PAM using the investigated design strategies. In fact, it is shown that the same bandwidths can be achieved either using multiple masses or multiple PAM layers. This allows for some flexibility in the design of suitable noise control treatments with PAM.
URI: https://reposit.haw-hamburg.de/handle/20.500.12738/10004
ISSN: 1520-8524
Institute: Department Fahrzeugtechnik und Flugzeugbau 
Fakultät Technik und Informatik 
Type: Article
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