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Wave propagation in nonlinear acoustic metamaterials has drew widespread interest. In this paper, we investigate wave propagation and its mitigation in a nonlinear metamaterial beam. Thorough numerical evaluations reveal that a strongly nonlinear acoustic metamaterials can result in effective erosion waves in an infinite structure and the impact vibration in a finite structure with a much higher fidelity than that achieved in linear counterparts.
Source link: https://europepmc.org/article/PPR/PPR557259
An optimal configuration of joint simulation scheme incorporating the finite element simulation and cuckoo search algorithms was suggested to achieve the broadband sound absorption at low frequencies within a small area. The initial geometric parameters of the investigated acoustic metamaterials were determined first, in order to minimize the optimization burden and increase optimization quality, according to the actual noise reduction goals. The findings revealed that the most effective design strategy was applicable to the production of broadband sound absorption in various low frequency ranges, providing a new approach for the manufacture and application of acoustic metamaterials.
Source link: https://europepmc.org/article/MED/36143762
Wave physics is of vital interest to wave physics, with crucial significance for underwater communications. Speeding up the movement of information carried by waves is of fundamental interest to wave physics. To solve the current information transfer capacity deficits, here we outline and experimentally demonstrate a system based on multipath sound twisting to enable real-time high-capacity communication without signal processing or sensor-scanning. A simple example of complicated image transmission is experimentally demonstrated, displaying as many independent channels as the path number multiplies by a vortex mode number and an extremely low bit error rate nearly 1/10 of the forward error correction limit.
Source link: https://europepmc.org/article/MED/36055988
Changes in the length of rear cavity for each chamber can be carried out in transfer function tube measurement as an improvement over other optimization techniques by theoretical modeling or finite element simulation. In the finite element simulation, which may demonstrate the sound absorption mechanism, the distributions of sound pressure for peak absorption frequency points were found. Meanwhile, finite element simulation revealed the APH-AM's greater length of the aperture and a smaller diameter of the aperture, which could further demonstrate the effectiveness of APH-AM in the low-frequency sound absorption.
Source link: https://europepmc.org/article/MED/36079319
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