4.7 Article

Tunable characteristics of low-frequency bandgaps in two-dimensional multivibrator phononic crystal plates under prestrain

Journal

SCIENTIFIC REPORTS
Volume 11, Issue 1, Pages -

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41598-021-87904-6

Keywords

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Funding

  1. National Natural Science Foundation of China [51562021]
  2. Key Talent Foundation of Gansu Province [2020RCXM100]
  3. Key Natural Science Foundation of Gansu Province [20JR5RA427, 20JR5RA211]
  4. Innovation Fund Project of Colleges and Universities in Gansu Province [2020A-039]
  5. Talent Innovation and Entrepreneurship Project of Lanzhou City [2020-RC-18]

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A novel two-dimensional tunable phononic crystal plate was studied, with bandgap characteristics calculated and low-frequency bandgap mechanism discussed. The influence of geometric parameters on bandgap characteristics was analyzed, along with studying bandgap adjustability under prestretch strain. Results showed lower bandgap starting frequency and wider bandwidth compared to traditional structures, with the ability to actively control low-frequency bandgap in real-time by applying prestretch strain.
In view of the influence of variability of low-frequency noise frequency on noise prevention in real life, we present a novel two-dimensional tunable phononic crystal plate which is consisted of lead columns deposited in a silicone rubber plate with periodic holes and calculate its bandgap characteristics by finite element method. The low-frequency bandgap mechanism of the designed model is discussed simultaneously. Accordingly, the influence of geometric parameters of the phononic crystal plate on the bandgap characteristics is analyzed and the bandgap adjustability under prestretch strain is further studied. Results show that the new designed phononic crystal plate has lower bandgap starting frequency and wider bandwidth than the traditional single-sided structure, which is due to the coupling between the resonance mode of the scatterer and the long traveling wave in the matrix with the introduction of periodic holes. Applying prestretch strain to the matrix can realize active realtime control of low-frequency bandgap under slight deformation and broaden the low-frequency bandgap, which can be explained as the multiple bands tend to be flattened due to the localization degree of unit cell vibration increases with the rise of prestrain. The presented structure improves the realtime adjustability of sound isolation and vibration reduction frequency for phononic crystal in complex acoustic vibration environments.

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