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Fabrication and Characterization of Thickness Mode Piezoelectric Devices for Atomization and Acoustofluidics
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Published on: August 5, 2020

Influence of material parameters on acoustic wave propagation modes in ZnO/Si bi-layered structures

Hui-dong Gao1, Shu-Yi Zhang, Xue Qi

  • 1Lab of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing, 210093, China. paslab@nju.edu.cn

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|February 9, 2006
PubMed

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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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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end.