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3D intra-cellular wave dynamics in a phononic plate with ultra-wide bandgap : attenuation, resonance and mode conversion

Saeid Hedayatrasa (UGent) and Mathias Kersemans (UGent)
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Abstract
The intra-cellular wave dynamics of a water jetted phononic plate are experimentally investigated by means of high-resolution 3D scanning laser Doppler vibrometry. The study is focused on the vibrational behavior around the ultra-wide bandgap of the plate (with a relative bandgap width of 0.89), as the critical frequency range of its phononic functionality. Broadband vibrational excitations are applied using a piezoelectric transducer and both in-plane and out-of-plane operational deflection shapes of the unit-cells are analyzed with respect to mode shapes calculated by finite element simulation. Attenuation and resonance of both symmetric and antisymmetric wave modes are validated, and it is shown that despite the absence of in-plane wave energy actuation, the symmetric modes are effectively excited in the phononic lattice, due to mode conversion from co-existing antisymmetric modes. Supported by finite element modal analysis, this mode conversion observation is explained by the slight through-the-thickness asymmetry introduced during manufacturing of the phononic plate which leads to coupling of modes with different symmetry. The results confirm the potential of such detailed 3D inspection of phononic crystals (and in general acoustic metamaterials) in gaining full insight about their intracellular dynamics, which can also illuminate discrepancies with respect to idealized numerical models, that might be due to manufacturing imperfections.
Keywords
Phononic crystal, Bandgap, Guided waves, 3D Laser Doppler vibrometry, Intra-cellular dynamics, Mode conversion, TOPOLOGY OPTIMIZATION, PROPAGATION, DESIGN

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MLA
Hedayatrasa, Saeid, and Mathias Kersemans. “3D Intra-Cellular Wave Dynamics in a Phononic Plate with Ultra-Wide Bandgap : Attenuation, Resonance and Mode Conversion.” SMART MATERIALS AND STRUCTURES, vol. 31, no. 3, 2022, doi:10.1088/1361-665x/ac4d65.
APA
Hedayatrasa, S., & Kersemans, M. (2022). 3D intra-cellular wave dynamics in a phononic plate with ultra-wide bandgap : attenuation, resonance and mode conversion. SMART MATERIALS AND STRUCTURES, 31(3). https://doi.org/10.1088/1361-665x/ac4d65
Chicago author-date
Hedayatrasa, Saeid, and Mathias Kersemans. 2022. “3D Intra-Cellular Wave Dynamics in a Phononic Plate with Ultra-Wide Bandgap : Attenuation, Resonance and Mode Conversion.” SMART MATERIALS AND STRUCTURES 31 (3). https://doi.org/10.1088/1361-665x/ac4d65.
Chicago author-date (all authors)
Hedayatrasa, Saeid, and Mathias Kersemans. 2022. “3D Intra-Cellular Wave Dynamics in a Phononic Plate with Ultra-Wide Bandgap : Attenuation, Resonance and Mode Conversion.” SMART MATERIALS AND STRUCTURES 31 (3). doi:10.1088/1361-665x/ac4d65.
Vancouver
1.
Hedayatrasa S, Kersemans M. 3D intra-cellular wave dynamics in a phononic plate with ultra-wide bandgap : attenuation, resonance and mode conversion. SMART MATERIALS AND STRUCTURES. 2022;31(3).
IEEE
[1]
S. Hedayatrasa and M. Kersemans, “3D intra-cellular wave dynamics in a phononic plate with ultra-wide bandgap : attenuation, resonance and mode conversion,” SMART MATERIALS AND STRUCTURES, vol. 31, no. 3, 2022.
@article{8736156,
  abstract     = {{The intra-cellular wave dynamics of a water jetted phononic plate are experimentally investigated by means of high-resolution 3D scanning laser Doppler vibrometry. The study is focused on the vibrational behavior around the ultra-wide bandgap of the plate (with a relative bandgap width of 0.89), as the critical frequency range of its phononic functionality. Broadband vibrational excitations are applied using a piezoelectric transducer and both in-plane and out-of-plane operational deflection shapes of the unit-cells are analyzed with respect to mode shapes calculated by finite element simulation. Attenuation and resonance of both symmetric and antisymmetric wave modes are validated, and it is shown that despite the absence of in-plane wave energy actuation, the symmetric modes are effectively excited in the phononic lattice, due to mode conversion from co-existing antisymmetric modes. Supported by finite element modal analysis, this mode conversion observation is explained by the slight through-the-thickness asymmetry introduced during manufacturing of the phononic plate which leads to coupling of modes with different symmetry. The results confirm the potential of such detailed 3D inspection of phononic crystals (and in general acoustic metamaterials) in gaining full insight about their intracellular dynamics, which can also illuminate discrepancies with respect to idealized numerical models, that might be due to manufacturing imperfections.}},
  articleno    = {{035010}},
  author       = {{Hedayatrasa, Saeid and Kersemans, Mathias}},
  issn         = {{0964-1726}},
  journal      = {{SMART MATERIALS AND STRUCTURES}},
  keywords     = {{Phononic crystal,Bandgap,Guided waves,3D Laser Doppler vibrometry,Intra-cellular dynamics,Mode conversion,TOPOLOGY OPTIMIZATION,PROPAGATION,DESIGN}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{14}},
  title        = {{3D intra-cellular wave dynamics in a phononic plate with ultra-wide bandgap : attenuation, resonance and mode conversion}},
  url          = {{http://dx.doi.org/10.1088/1361-665x/ac4d65}},
  volume       = {{31}},
  year         = {{2022}},
}

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