期刊
PHYSICS LETTERS A
卷 380, 期 47, 页码 3963-3969出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2016.09.055
关键词
Phononic crystals; Band gaps; Defect modes; Fiber Bragg gratings (FBGs); Flexural waves
资金
- National Natural Science Foundation of China [11272282]
This work experimentally studies influences of the point defect modes on the group velocity of flexural waves in a phononic crystal Timoshenko beam. Using the transfer matrix method with a supercell technique, the band structures and the group velocities around the defect modes are theoretically obtained. Particularly, to demonstrate the existence of the localized defect modes inside the band gaps, a high-sensitivity fiber Bragg grating sensing system is set up and the displacement transmittance is measured. Slow propagation of flexural waves via defect coupling in the phononic crystal beam is then experimentally demonstrated with Hanning windowed tone burst excitations. (C) 2016 Elsevier B.V. All rights reserved.
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