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Drawer-like tunable ventilated sound barriera).

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This study presents a tunable ventilated sound barrier using a novel drawer-like design. This innovation optimizes low-frequency sound insulation bandwidth for practical acoustic applications.

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Area of Science:

  • Acoustics
  • Materials Science
  • Mechanical Engineering

Background:

  • Ventilated acoustic barriers are crucial for noise reduction but often suffer from limited bandwidth and adjustability.
  • Existing designs struggle to provide effective low-frequency sound insulation over a wide range.

Purpose of the Study:

  • To experimentally demonstrate a novel drawer-like tunable ventilated sound barrier.
  • To optimize the low-frequency bandwidth of ventilated sound barriers for enhanced performance.

Main Methods:

  • The study utilizes a monolayer periodic lattice of oppositely oriented Helmholtz resonators with a drawer-like movable design.
  • The design allows for precise control over the resonant frequency and working bandwidth.
  • Two types of dual-layer unit cells with varying numbers of resonator pairs were optimized.

Main Results:

  • The drawer-like design enables tunable and optimizable bandwidth for low-frequency sound insulation.
  • Fractional bandwidths of 14.8% and 31.8% were achieved for dual-layer unit cells.
  • Sound insulation is attributed to the coupling of symmetric and anti-symmetric modes, involving sound reflection and absorption.

Conclusions:

  • The developed ventilated barrier offers tunable bandwidth for effective low-frequency sound insulation.
  • This research provides a practical approach for architectural acoustics and ventilated noise reduction.
  • The design overcomes limitations of traditional barriers, offering improved adjustability and bandwidth.