Novel cross shape phononic crystals with broadband vibration wave attenuation characteristic: Design, modeling and testing

2021 ◽  
Vol 163 ◽  
pp. 107665
Author(s):  
Emad Panahi ◽  
Ali Hosseinkhani ◽  
Mohammad Farid Khansanami ◽  
Davood Younesian ◽  
Mostafa Ranjbar
Keyword(s):  
Wave Attenuation ◽  
Phononic Crystals ◽  
Attenuation Characteristic ◽  
Vibration Wave

Wide range of wave attenuation in beam-supported stepped hybrid phononic crystals

Wave Motion ◽  
2022 ◽  
Vol 108 ◽  
pp. 102827
Author(s):  
J.C. Guo ◽  
J.R. Li ◽  
L. Zhang ◽  
Z. Zhang
Keyword(s):  
Wave Attenuation ◽  
Phononic Crystals ◽  
Wide Range

Maximizing wave attenuation in viscoelastic phononic crystals by topology optimization

Ultrasonics ◽  
2019 ◽  
Vol 94 ◽  
pp. 419-429 ◽  
Author(s):  
Yafeng Chen ◽  
Di Guo ◽  
Yang Fan Li ◽  
Guangyao Li ◽  
Xiaodong Huang
Keyword(s):  
Topology Optimization ◽  
Wave Attenuation ◽  
Phononic Crystals

scholarly journals Plane and Surface Acoustic Waves Manipulation by Three-Dimensional Composite Phononic Pillars with 3D Bandgap and Defect Analysis

Acoustics ◽  
2021 ◽  
Vol 3 (1) ◽  
pp. 25-41
Author(s):  
Muhammad ◽  
C.W. Lim ◽  
Andrew Y. T. Leung
Keyword(s):  
Acoustic Waves ◽  
Wave Attenuation ◽  
Numerical Technique ◽  
Surface Acoustic Waves ◽  
Three Dimensional ◽  
Phononic Crystals ◽  
Defect State ◽  
Two Dimensional ◽  
Defect Analysis ◽  
Acoustic Metamaterials

The current century witnessed an overwhelming research interest in phononic crystals (PnCs) and acoustic metamaterials (AMs) research owing to their fantastic properties in manipulating acoustic and elastic waves that are inconceivable from naturally occurring materials. Extensive research literature about the dynamical and mechanical properties of acoustic metamaterials currently exists, and this maturing research field is now finding possible industrial and infrastructural applications. The present study proposes a novel 3D composite multilayered phononic pillars capable of inducing two-dimensional and three-dimensional complete bandgaps (BGs). A phononic structure that consisted of silicon and tungsten layers was subjected to both plane and surface acoustic waves in three-dimensional and two-dimensional periodic systems, respectively. By frequency response study, the wave attenuation, trapping/localization, transmission, and defect analysis was carried out for both plane and surface acoustic waves. In the bandgap, the localized defect state was studied for both plane and surface acoustic waves separately. At the defect state, the localization of both plane and surface acoustic waves was observed. By varying the defect size, the localized frequency can be made tailorable. The study is based on a numerical technique, and it is validated by comparison with a reported theoretical work. The findings may provide a new perspective and insight for the designs and applications of three-dimensional phononic crystals for surface acoustic wave and plane wave manipulation, particularly for energy harvesting, sensing, focusing and waves isolation/attenuation purposes.

scholarly journals Influence of Cavity Width on Attenuation Characteristic of Gas Explosion Wave

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Dengke Xu ◽  
Chaomin Mu ◽  
Zhongqing Li ◽  
Wenqing Zhang
Keyword(s):  
Wave Attenuation ◽  
Mach Reflection ◽  
Attenuation Factor ◽  
Diameter Ratio ◽  
Gas Explosion ◽  
Explosion Wave ◽  
Attenuation Characteristic ◽  
Cavity Structure ◽  
Cavity Width ◽  
Ratio Range

This study aimed to investigate the influence of cavity width on the attenuation characteristic of gas explosion wave. Attenuation mechanism of gas explosion wave through cavity was obtained by numerical simulation. The gas explosion shock wave energy can be greatly attenuated through the cavity structure in five stages, namely, plane wave, expansion, oblique reflection, Mach reflection, and reflection stack, to ensure that it is eliminated. Cavities with various width sizes, namely, 500   ∗ 300   ∗ 200, 500   ∗ 500   ∗ 200, and 500   ∗ 800   ∗ 200 (length   ∗ width   ∗ height, unit: mm), were experimented to further investigate the attenuation characteristics through a self-established large-size pipe gas explosion experimental system with 200 mm diameter and 36 m length. Results showed an evident attenuation effect on flame duration light intensity (FDLI) and peak overpressure with increasing cavity width. Compared with 300 mm, the overall FDLI decreased by 83.0%, and the peak overpressure decreased by 71.2% when the cavity width was 800 mm. The fitting curves of the FDLI and peak overpressure attenuation factors to width-diameter demonstrated that the critical width-diameter was 2.19 when the FDLI attenuation factor was 1. The FDLI attenuation factor sharply decreased at the width-diameter ratio range from 1.5 to 2.5 and basically remained steady at 0.17 at the width-diameter ratio range from 2.7 to 4.0. The peak overpressure attenuation factor gradually decreased with the increase of width-diameter ratio and changed from 0.93 to 0.28 with width-diameter ratio from 1.5 to 4.0. The research results can serve as a good reference for the design of gas explosion wave-absorbing structures.

Wave attenuation and dissipation mechanisms in viscoelastic phononic crystals

2013 ◽  
Vol 113 (10) ◽  
pp. 106101 ◽  
Author(s):  
Joo Hwan Oh ◽  
Yoon Jae Kim ◽  
Yoon Young Kim
Keyword(s):  
Wave Attenuation ◽  
Phononic Crystals

Modeling and Analysis of Phononic Crystal With Coupled Lanes for Enhanced Elastic Wave Attenuation

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Jiawen Xu ◽  
Guobiao Hu ◽  
Lihua Tang ◽  
Yumin Zhang ◽  
Ruqiang Yan
Keyword(s):  
Elastic Wave ◽  
Phase Difference ◽  
Wave Attenuation ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Fem Analysis ◽  
Phononic Crystals ◽  
Attractive Potential ◽  
Destructive Interference ◽  
Unit Cells

Abstract Phononic crystals and metamaterials have attractive potential in elastic wave attenuation and guiding over specific frequency ranges. Different from traditional phononic crystals/metamaterials consisting of identical unit cells, a phononic crystal with coupled lanes is reported in this article for enhanced elastic wave attenuation in the low-frequency regime. The proposed phononic crystal takes advantages of destructive interference mechanism. A finitely length phononic crystal plate consisting of coupled lanes is considered for conceptual verification. The coupled lanes are designed to split the incident elastic wave into separated parts with a phase difference to produce destructive interference. Theoretical modeling and finite element method (FEM) analysis are presented. It is illustrated that significant elastic wave attenuation is realized when the phase difference of elastic waves propagating through the coupled lanes approximates π. Besides, multiple valleys in the transmission can be achieved in a broad frequency range with one at a frequency as low as 1.85 kHz with unit cells’ width and length of 25 mm and ten unit cells in one lane.

scholarly journals Spider Web-Like Phononic Crystals for Piezoelectric Mems Resonators to Reduce Acoustic Energy Dissipation

Micromachines ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 626 ◽  
Author(s):  
Bao ◽  
Wu ◽  
Zhou ◽  
Wu ◽  
Zhang ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Wave Attenuation ◽  
Phononic Crystals ◽  
Acoustic Energy ◽  
Acoustic Metamaterials ◽  
Element Analysis ◽  
Micro Electro Mechanical Systems ◽  
Spider Web ◽  
Mems Resonators ◽  
Energy Leakage

Phononic crystals (PnC) are a remarkable example of acoustic metamaterials with superior wave attenuation mechanisms for piezoelectric micro-electro-mechanical systems (MEMS) resonators to reduce the energy dissipation. Herein, a spider web-like PnC (SW-PnC) is proposed to sufficiently isolate the wave vibration. Finite-element analysis is performed to gain insight into the transmission property of finite PnC, and band characteristics by infinite periods. In comparison with the circle hole PnC at a similar bandgap, due to its already very lightweight PnC structure compared with previously reported PnCs, the proposed PnC offers a significantly lighter weight, smaller lattice constant, and greater energy leakage inhibition. More specifically, the resonator with the SW-PnC plate as the anchoring substrate exhibited a quality factor as high as 66569.7 at 75.82 MHz.

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