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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Programmable Elastic Wave Control Via Mechanical-Acoustic Interaction in Bistable Metamaterials.

Yuanyuan Li1,2, Yonghua Yu1,2, Chuanqing Chen1,2

  • 1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a mechanical-acoustic interaction (MAI) paradigm for programmable elastic wave control using bistable mechanical states in acoustic dome metamaterials (ADMs). This method allows for reconfigurable wave manipulation without external stimuli.

Keywords:
acousticsattenuationbistabilitymechanicsmetamaterialmodular designscalabilityvibrationwave propagation

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Area of Science:

  • Solid mechanics
  • Acoustics
  • Materials science
  • Metamaterials

Background:

  • Conventional elastic wave metamaterials have fixed structures, limiting their adaptability for specific applications.
  • Reconfigurable wave manipulation requires novel approaches beyond static designs.

Purpose of the Study:

  • To propose a mechanical-acoustic interaction (MAI) paradigm for mechanically programmable elastic wave control.
  • To develop an acoustic dome metamaterial (ADM) with reconfigurable functionalities through bistable mechanical states.

Main Methods:

  • The proposed acoustic dome metamaterial (ADM) utilizes modular bistable units that switch between peak and valley configurations.
  • Spatially encoding these bistable states allows for reconfiguration of band structure and transmission characteristics.
  • Numerical simulations and experimental validation were employed to demonstrate the MAI paradigm.

Main Results:

  • Demonstrated low-frequency vibration suppression using the ADM.
  • Achieved reconfigurable waveguiding and defect-state-enabled energy localization.
  • Introduced a one-press programming strategy for enhanced efficiency and reproducibility.

Conclusions:

  • The MAI paradigm offers a physically intuitive and scalable mechanism for elastic wave programming.
  • This approach enables reconfigurable acoustic metamaterials and intelligent acoustic devices.
  • Mechanical programming of elastic wave control is achieved through reversible bistable states.