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Design of flat broadband sound insulation metamaterials by combining Helmholtz resonator and fractal structure

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Abstract

A new sound insulation metamaterial (SIM) is designed by combining a Helmholtz resonator and a fractal structure for sound insulation in the frequency range of 600 to 1700 Hz. Using a fractal-based internal structure, the designed hybrid SIM shows a relatively constant value of sound transmission loss (STL) over the target frequency range. The basic concept of this work is to develop two functional parts working in each effective frequency range. One is a Helmholtz resonance structure that operates with a high value of STL from 600 to 1000 Hz, and the other is an internal fractal structure that shows a high STL at higher frequencies in the 1000 to 1700 Hz range. In this work, the proposed metamaterial has a mean of 16.34 dB with a standard deviation of 1.73 dB within the wide target range of 600 to 1700 Hz. Additionally, the proposed SIM is approximately 40 % smaller in size than the previous resonator and has a higher mean STL with a small ΔSTL of 1.7 dB between highest and lowest values.

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Acknowledgments

This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A5A808320112) and was supported by the Technology Innovation Program (No. 2001124301) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Pusan National University, Busan, 46241, Korea

    Seoung-Ho Baek & Jun-Young Jang

  2. School of Mechanical Engineering, and ERC/NSDM, Pusan National University, Busan, 46241, Korea

    Kyung-Jun Song & Sang-Hu Park

Authors
  1. Seoung-Ho Baek
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  2. Jun-Young Jang
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  3. Kyung-Jun Song
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  4. Sang-Hu Park
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Corresponding author

Correspondence to Sang-Hu Park.

Additional information

Seoung Ho Baek is currently M.S. degree student in School of Mechanical Engineering at Pusan National University. His research topics are the design of acoustic metamaterials and their applications.

Jun-young Jang is currently a Ph.D. course student in Mechanical Engineering at Pusan National University. He earned his M.S. at Pusan National University. His research topics are acoustic metastructures.

Kyung Jun Song is a Professor of Mechanical Engineering at Pusan National University. He earned his M.S. and Ph.D. in Mechanical Engineering at University of Michigan in 2004 and 2010, respectively. His research fields are mechanical meta-structures for acoustics and vibration control.

Sang Hu Park is a Professor of Mechanical Engineering at Pusan National University. He earned his M.S. and Ph.D. in Mechanical Engineering at KAIST in 1996 and 2006, respectively. His research fields include engineering for additive manufacturing, sheet metal formation, and nanofabrication.

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Baek, SH., Jang, JY., Song, KJ. et al. Design of flat broadband sound insulation metamaterials by combining Helmholtz resonator and fractal structure. J Mech Sci Technol 35, 2809–2817 (2021). https://doi.org/10.1007/s12206-021-0604-2

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  • DOI: https://doi.org/10.1007/s12206-021-0604-2

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