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Related Concept Videos

Standing Waves01:17

Standing Waves

Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
Sound Waves: Resonance01:14

Sound Waves: Resonance

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...
Wave Parameters01:10

Wave Parameters

The simplest mechanical waves are associated with simple harmonic motion and repeat themselves for several cycles. These simple harmonic waves can be modeled using a combination of sine and cosine functions. Consider a simplified surface water wave that moves across the water's surface. Unlike complex ocean waves, in surface water waves, water moves vertically, oscillating up and down, whereas the disturbance of the wave moves horizontally through the medium. If a seagull is floating on the...
Travelling Waves01:04

Travelling Waves

A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is water;...
Shock Waves01:16

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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Modes of Standing Waves - I01:03

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This phenomenon...

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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
06:51

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Published on: August 21, 2018

Phononic plate waves.

Tsung-Tsong Wu1, Jin-Chen Hsu, Jia-Hong Sun

  • 1Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan. wutt@ndt.iam.ntu.edu.tw

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|October 13, 2011
PubMed
Summary
This summary is machine-generated.

Phononic crystals (PCs) in thin plates enable control of Lamb waves for advanced filters and resonators. This review covers theoretical and experimental studies on PC plate waves, highlighting improved resonator performance.

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Area of Science:

  • Acoustics and Materials Science
  • Solid-State Physics
  • Wave Phenomena

Background:

  • Phononic crystals (PCs) offer unique frequency band gaps and tunable band structures.
  • Lamb waves in thin plates with PC structures are crucial for filters, resonators, and waveguides.

Purpose of the Study:

  • To review recent theoretical and experimental studies on Lamb waves in 2D phononic crystal plate structures.
  • To highlight the potential applications of phononic crystal plates in wave manipulation and resonant devices.

Main Methods:

  • Theoretical analyses using plane wave expansion (PWE), finite-difference time-domain (FDTD), and finite-element (FE) methods.
  • Experimental design and fabrication of silicon-based Lamb wave resonators utilizing PC plates.

Main Results:

  • Demonstrated PC-based negative refraction, lensing, waveguides, and resonant cavities for Lamb waves.
  • Investigated the influence of geometric parameters on guiding, resonance efficiency, and mode frequencies.
  • Achieved significant improvements in insertion losses and quality factors of resonators using PC plates.

Conclusions:

  • Phononic crystal plates offer effective control over Lamb wave propagation and localization.
  • The integration of PCs in resonators significantly enhances their performance characteristics.
  • This review underscores the potential of phononic crystal plates for advanced acoustic devices.