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Updated: Jan 30, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
Acoustic directional source based on Penrose quasi-crystal arrangements of metallic rods embedded in a fluid
K Zong1, H Franklin2, A Tinel2
1Laboratoire Ondes et Milieux Complexes, UMR CNRS 6294, Université Le Havre Normandie, 75 rue Bellot, 76058 Le Havre, France; College of Automation and Electronic Engineering, Qingdao University of Science and Technology, 99 Road Songling, 266061 Qingdao, China.
Abstract:
The directional emission properties of a circular device formed of a small number of metallic rods placed at the nodes of Penrose's tiling are investigated. At the center of the device a non-directional primary source emits monochromatic acoustic waves. In a wide frequency range, the beams come out of the device along preferential directions related to the symmetry of order 5 of the tiling and the non-periodicity in the radial direction. There are some frequencies for which the waves are completely trapped by the device. The shape, the distribution and the intensity of the emitted beams outside are closely dependent on the frequency. A comparison between numerical results and experiments is presented.
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