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Related Concept Videos

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Areconfigurable coding acoustic metasurface for multifunctional beam manipulation.

Hu Jie1, Zhou Hao2, Jiang Mengqi2

  • 1College of information science and technology & College of artificial intelligence, Nanjing Forestry University, Nanjing, P.R. China. hujie@njfu.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a reconfigurable coding acoustic metasurface with compact, subwavelength unit cells for dynamic acoustic wavefront shaping. The design offers a broad operating band and simple reconfiguration, enabling applications in acoustic imaging and communication.

Keywords:
Acoustic focusingAcoustic metamaterialsBeam splittingCoding metasurfaceReconfigurable

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Area of Science:

  • Acoustics
  • Materials Science
  • Wave Engineering

Background:

  • Reconfigurable metasurfaces offer advanced control over acoustic waves.
  • Challenges remain in achieving subwavelength thickness, wide bandwidth, and design simplicity.

Purpose of the Study:

  • To theoretically design and experimentally realize a reconfigurable coding acoustic metasurface.
  • To achieve dynamic wavefront shaping with a compact, subwavelength, and broad operating band design.

Main Methods:

  • Design of compact unit cells with a coiled configuration enabling binary encoding (0 and 1).
  • Utilizing a single structural parameter change for reconfiguration.
  • Theoretical design, numerical simulation, and experimental verification.

Main Results:

  • Demonstrated a reconfigurable coding acoustic metasurface with unit cells of deep-subwavelength scale (H=18 mm).
  • Achieved dynamic wavefront shaping across a broad frequency range (1.7-2.5 kHz).
  • Verified performance through beam splitting and acoustic focusing, with excellent agreement between simulated and measured results.

Conclusions:

  • The designed metasurface efficiently and flexibly manipulates acoustic wavefronts for desired patterns.
  • The design offers advantages in easy fabrication, ultrathin thickness, and broad bandwidth.
  • Opens avenues for novel acoustic functional devices and applications in acoustic imaging and communication.