含缺陷一维声子晶体斜入射声波的透射特性研究

doi:10.16180/j.cnki.issn1007-7820.2023.11.011

Abstract

Abstract:

The propagation of acoustic waves in the periodic structure of phononic crystals has energy band effects, and phononic crystals containing defects can form new defect modes in the original forbidden band. In this study, the omnidirectional transmission spectra of phononic crystals with and without defects in obliquely incident acoustic waves are calculated respectively by the transfer matrix method, and the defect modes caused by solid defects are found by comparative analysis. On this basis, the influence of the thickness and position of the defect layer on the transmittance of the defect state is studied in this study. The existence of defect modes caused by solid defects and their angle-dependent characteristics are verified by underwater acoustic transmission experiments. The experimental results show that there is a new transmission passband in the first Bragg forbidden band of the omnidirectional transmission spectrum of the defect-containing structure, and with the increase of the incident angle within a certain range, the frequency corresponding to this passband is shifted to the high frequency direction. This study improves the propagation characteristics of obliquely incident acoustic waves in one-dimensional phononic crystals containing defects, and provides a theoretical and experimental basis for the practical application of defect states.

Key words: ultrasonic, fluid-solid superlattice, defective state, Bragg forbidden band, transfer matrix, oblique incidence, transmission characteristics, sound energy regulation

CLC Number:

TN03

SHEN Jiamin,FAN Zhetao,XU Guidong,XU Chenguang. Study on the Transmission Characteristics of Oblique Incident Sound Waves in One-Dimensional Phononic Crystals with Defects[J].Electronic Science and Technology, 2023, 36(11): 76-82.

Figures/Tables 8

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References 18

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	密度 ρ/kg·m^-3	厚度 d/m	横波声速 c_t/m·s^-1	纵波声速 c_g/m·s^-1
A(PMMA)	1.18×10³	1.8×10^-3	1.3×10³	2.7×10³
B' (水)	1.00×10³	2.8×10^-3	-	1.5×10³
B' (水)	1.00×10³	1.8×10^-3	-	1.5×10³

Study on the Transmission Characteristics of Oblique Incident Sound Waves in One-Dimensional Phononic Crystals with Defects

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