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Experimental study of coupled acoustic-mechanical bandgaps

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Abstract

This experimental study investigates the presence of coupled bandgaps for bending and acoustic waves in acoustic-mechanical systems through the analysis of a bandgap structure. The vibrational and acoustic behaviour of a non-planar unit cell with an added acoustic cavity is analyzed using finite element analysis, considering the interaction between acoustics and structure. Band diagrams are utilized to explore the bandgap phenomenon in acoustic, mechanical, and acoustic-structure interaction. Two coupled finite structures, based on specific geometric dimensions, are constructed using a non-planar plate as the mechanical domain, but with different volumes of the acoustic domain. Finite element analysis is employed to evaluate the vibro-acoustic behaviour of these finite structures composed of non-planar unit cells. Additionally, experimental investigations are conducted on micro-milled finite structures to comprehensively analyze the bandgap phenomenon. With these two approaches, the existence of a coupled bandgap is demonstrated, where no wave propagation occurs for both mechanical and acoustic waves. In addition, it is observed that varying the volume of the acoustic domain can adversely affect the coupled bandgap phenomenon. This study contributes valuable insights to the utilization of bandgap structures for vibration reduction in coupled acoustic-mechanical systems.

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Abbreviations

ASI :

Acoustic structural interaction

RC :

Reference case

VC :

Incremented volume case

BD :

Band diagram

VR :

Vibrational response

BG :

Bandgap

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Acknowledgments

All the authors acknowledge the support of the Audio Research Group in GN Audio A/S. This work was supported by the Danish Council for Independent Research - Individual Postdoctoral Grants.

Author information

Authors and Affiliations

  1. Research Department, AcústicaDNS, Quito, Ecuador

    Daniel Nunez-Solano

  2. Audio Research, GN Audio A/S, Lautrupbjerg 7, 2750, Ballerup, Denmark

    Junghwan Kook

  3. Sound and Acoustic Engineer Department, Universidad de Las Américas, Quito, Ecuador

    Virginia Puyana-Romero

Authors
  1. Daniel Nunez-Solano
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  2. Junghwan Kook
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  3. Virginia Puyana-Romero
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Corresponding author

Correspondence to Junghwan Kook.

Additional information

Daniel Nunez-Solano received his M.Sc. degree in Engineering Acoustics from the Department of Electrical Engineering, Technical University of Denmark. He was a lecturer and researcher in the Department of Sound and Acoustic Engineering at the Universidad de Las Americas (2018–2020) in Ecuador. In 2020, he became a researcher and consultant at AcusticaDNS. Since 2022, he has been a consultant at Engineering Dynamics, Vysus, Denmark. His current research interests include noise, architectural acoustics, and vibroacoustic.

Junghwan Kook received his Ph.D. from the School of Information and Mechatronics, Gwangju Institute of Science and Technology (GIST), South Korea (2012). He was an Assistant Professor in the Department of Electrical Engineering, Technical University of Denmark (2015–2017). Since 2017, he has been a research scientist at the Audio Research, GN Audio (JABRA). His current research interests multidisciplinary design optimization and vibroacoustic.

Virginia Puyana-Romero received her Ph.D. from the Department of Architecture and Industrial Design of the University of Campania, Aversa, Italy. She was a lecturer in the Department of Sound and Acoustic Engineering of the Universidad de Las Americas, Quito, Ecuador. Since 2022 she has been working as a laboratory technician at the Laboratory of Applied Linguistics of the Universidad de Cadiz, Spain. Her current research areas are architectural acoustics, environmental acoustics, and natural materials.

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Nunez-Solano, D., Kook, J. & Puyana-Romero, V. Experimental study of coupled acoustic-mechanical bandgaps. J Mech Sci Technol 37, 4973–4980 (2023). https://doi.org/10.1007/s12206-023-0904-9

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  • DOI: https://doi.org/10.1007/s12206-023-0904-9

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