Negative Group Velocities of Lamb-Type Waves in a Glass/Water/Glass Structure Controlled by the Thickness of Water Layer
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概要
- 論文の詳細を見る
In this paper, we described the characteristics of negative group velocities of Lamb-type waves in a glass/water/glass structure controlled by the thickness of the water layer. Lamb waves in an elastic plate have negative group velocities. It is known that the range of existence of negative group velocities depends on the Poisson's ratio of the elastic plate. However, in the case of Lamb waves, their negative group velocities depend on the physical parameters of each material; therefore, we fabricated a structure such that the negative group velocities of Lamb waves are controllable without the limitation of the parameters of each material. The waves in such a structure are referred to as the Lamb-type waves. Using numerical calculations, we determined that the negative group velocities of the Lamb-type waves can be varied by changing the geometric parameters, and the negative group velocities are changed although the frequencies are fixed. Additionally, we found that the Lamb-type waves have various characteristics corresponding to the propagation modes.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2007-07-30
著者
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YAMAMOTO Ken
Kobayasi Institute of Physical Research
-
Mizutani Koichi
Graduate School Of Systems And Information Engineering Univ. Of Tsukuba
-
Wakatsuki Naoto
Graduate School Of Systems And Information Engineering University Of Tsukuba
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Nishimiya Kojiro
Graduate School Of Systems And Information Engineering University Of Tsukuba
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Mizutani Koichi
Graduate School of System and Information Engineering, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
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