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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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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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Resonance in an AC Circuit01:26

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The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
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Resonance02:52

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Concept of Resonance and its Characteristics01:19

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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Fabrication and Characterization of Disordered Polymer Optical Fibers for Transverse Anderson Localization of Light
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Energy Localization through Locally Resonant Materials.

Marco Moscatelli1,2, Claudia Comi1, Jean-Jacques Marigo2

  • 1Department of Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy.

Materials (Basel, Switzerland)
|July 10, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel system using Locally Resonant Materials (LRMs) to focus mechanical energy from elastic waves. This metamaterial-based energy harvester optimizes wave localization for efficient energy concentration.

Keywords:
energy harvestinghomogenizationlocally resonant material

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Area of Science:

  • Metamaterials and wave phenomena
  • Solid mechanics and acoustics
  • Energy harvesting technologies

Background:

  • Metamaterials offer unique wave manipulation capabilities, including focusing and localization.
  • Novel energy harvester configurations are being explored using these properties.
  • Elastic anti-plane waves carry mechanical energy that can be harnessed.

Purpose of the Study:

  • To develop and optimize a system for concentrating mechanical energy from elastic anti-plane waves.
  • To design a Fabry-Pérot interferometer-like system using Locally Resonant Materials (LRMs).
  • To achieve maximum focusing of incoming mechanical energy through geometric optimization.

Main Methods:

  • Utilizing Locally Resonant Materials (LRMs) for wave attenuation and localization.
  • Employing a two-scale asymptotic technique for effective LRM behavior analysis.
  • Developing a complete analytic description of the system's motion.
  • Validating analytic results with numerical simulations.

Main Results:

  • A system design based on LRMs and a homogeneous cavity, analogous to a Fabry-Pérot interferometer, was developed.
  • The attenuation properties of LRMs enable wave localization at specific frequencies.
  • Geometric optimization of the system was performed to maximize mechanical energy focusing.
  • Analytic models were validated by numerical simulations, confirming the system's performance.

Conclusions:

  • The developed system effectively concentrates mechanical energy from elastic anti-plane waves.
  • Locally Resonant Materials are crucial for achieving wave localization and energy focusing.
  • The study provides a validated analytic framework for designing such energy harvesters.
  • This research opens avenues for novel metamaterial-based energy harvesting solutions.