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Crystals 2016, 6(4), 45; doi:10.3390/cryst6040045

Analysis of Longitudinal Waves in Rod-Type Piezoelectric Phononic Crystals

Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of Education, and School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
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Academic Editors: Victor J. Sanchez-Morcillo, Vicent Romero-Garcia and Luis M. Garcia-Raffi
Received: 14 February 2016 / Revised: 28 March 2016 / Accepted: 12 April 2016 / Published: 18 April 2016
(This article belongs to the Special Issue Phononic Crystals)
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Abstract

Phononic crystals can be used to control elastic waves due to their frequency bands. This paper analyzes the passive and active control as well as the dispersion properties of longitudinal waves in rod-type piezoelectric phononic crystals over large frequency ranges. Based on the Love rod theory for modeling the longitudinal wave motions in the constituent rods and the method of reverberation-ray matrix (MRRM) for deriving the member transfer matrices of the constituent rods, a modified transfer matrix method (MTMM) is proposed for the analysis of dispersion curves by combining with the Floquet–Bloch principle and for the calculation of transmission spectra. Numerical examples are provided to validate the proposed MTMM for analyzing the band structures in both low and high frequency ranges. The passive control of longitudinal-wave band structures is studied by discussing the influences of the electrode’s thickness, the Poisson’s effect and the elastic rod inserts in the unit cell. The influences of electrical boundaries (including electric-open, applied electric capacity, electric-short and applied feedback control conditions) on the band structures are investigated to illustrate the active control scheme. From the calculated comprehensive frequency spectra over a large frequency range, the dispersion properties of the characteristic longitudinal waves in rod-type piezoelectric phononic crystals are summarized. View Full-Text
Keywords: piezoelectric phononic crystals; periodic composite rods; longitudinal waves; modified transfer matrix method; method of reverberation-ray matrix; frequency spectra; band structures; high frequency analysis; poisson’s effect piezoelectric phononic crystals; periodic composite rods; longitudinal waves; modified transfer matrix method; method of reverberation-ray matrix; frequency spectra; band structures; high frequency analysis; poisson’s effect
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, L.; Guo, Y. Analysis of Longitudinal Waves in Rod-Type Piezoelectric Phononic Crystals. Crystals 2016, 6, 45.

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