Experimental study on slow flexural waves around the defect modes in a phononic crystal beam using fiber Bragg gratings
Journal
Physics Letters, Section A: General, Atomic and Solid State Physics
Journal Volume
380
Journal Issue
47
Start Page
3963
End Page
3969
ISSN
03759601
Date Issued
2016
Author(s)
Abstract
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.
Subjects
Band Gaps
Defect Modes
Fiber Bragg Gratings (fbgs)
Flexural Waves
Phononic Crystals
Crystals
Elastic Waves
Energy Gap
Fiber Bragg Gratings
Light Velocity
Phonons
Transfer Matrix Method
Defect Mode
Fiber Bragg Grating Sensing System
Fiber Bragg Gratings (fbgs)
High Sensitivity
Localized Defects
Phononic Crystal
Point-defect Modes
Supercell Technique
Defects
Publisher
Elsevier B.V.
Type
journal article