Journal of Vibration and Sound

Journal of Vibration and Sound

Low-Frequency Noise Reduction with Metamaterial Mufflers Based on Labyrinthine Cells

Document Type : research article

Author
Alumnus of Imam Hossein University
Abstract
This study focuses on the design and development of a metamaterial muffler for low-frequency noise reduction in compact environments. The proposed muffler is an acoustic metamaterial (AMM) consisting of nine labyrinthine cells, each specifically designed to attenuate noise within a particular frequency range. The design process involves acoustic simulations in COMSOL and backpressure analysis in ANSYS Fluent, followed by experimental validation of transmission loss.



Results indicate that the metamaterial muffler effectively reduces noise over 25 dB in the 200-500 Hz frequency range. The primary noise reduction mechanism is acoustic resonance within the labyrinthine cells, which dissipates acoustic energy. Additionally, the optimized design generates a backpressure of 8700 Pascals, which has minimal negative impact on engine performance. A comparison between simulation and experimental results shows a good agreement, though minor discrepancies at higher frequencies are attributed to fabrication errors in the cells.



The findings highlight the potential of metamaterial mufflers for low-frequency noise reduction in various industries without increasing volume or compromising performance.
Keywords
Subjects

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