Sound Propagation Characteristic of Phononic Crystals Pipeline with Periodic Vibration Isolation Mass

2020 ◽  
Author(s):  
X. Jiang ◽  
D. Wang ◽  
F. Zang ◽  
Q. Zeng ◽  
Y. Zhang
Keyword(s):  
Vibration Isolation ◽  
Sound Propagation ◽  
Propagation Characteristic ◽  
Phononic Crystals ◽  
Periodic Vibration

Simulation for Range Prediction of Active Sonar in Shallow Water

2013 ◽  
Vol 385-386 ◽  
pp. 514-517 ◽  
Author(s):  
Liang Zhang ◽  
Chun Xia Meng ◽  
Jian Na
Keyword(s):  
Shallow Water ◽  
Sound Speed ◽  
Sound Absorption ◽  
Sound Propagation ◽  
Propagation Characteristic ◽  
Water Medium ◽  
Speed Profile ◽  
Long Distance ◽  
Sound Speed Profile ◽  
Active Sonar

In shallow water the acoustic wave from ambient noise sources carries a large number of environment information based on the complicated reflection both on the surface and seabed interface. The sound speed profile is one of the influencing factors of sound propagation characteristic, while for a long distance the sound absorption coefficient of water medium has an important significance to propagation range. The simulation results show that in shallow water sound absorption of seabed, sound speed profile and sound absorption of water were taken into account, then range prediction of active sonar can be exactly obtained using normal-mode propagation.

scholarly journals Study on bandgap vibration isolation of super-cell phononic crystals based on magnetorheological elastomers

AIP Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 125113
Author(s):  
Guo-Jun Yu ◽  
Xi-Xi Wen ◽  
Cheng-Bin Du ◽  
Ling-Yun Wang ◽  
Shao-Jie Zhu
Keyword(s):  
Vibration Isolation ◽  
Phononic Crystals ◽  
Magnetorheological Elastomers ◽  
Super Cell

scholarly journals Elastic Wave Propagation of Two-Dimensional Metamaterials Composed of Auxetic Star-Shaped Honeycomb Structures

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 121 ◽  
Author(s):  
Shu-Yeh Chang ◽  
Chung-De Chen ◽  
Jia-Yi Yeh ◽  
Lien-Wen Chen
Keyword(s):  
Wave Propagation ◽  
Cross Sections ◽  
Vibration Isolation ◽  
Negative Refraction ◽  
Phononic Crystal ◽  
Phononic Crystals ◽  
The Self ◽  
The Finite Element Method ◽  
Elastic Waveguide ◽  
Potential Applications

In this paper, the wave propagation in phononic crystal composed of auxetic star-shaped honeycomb matrix with negative Poisson’s ratio is presented. Two types of inclusions with circular and rectangular cross sections are considered and the band structures of the phononic crystals are also obtained by the finite element method. The band structure of the phononic crystal is affected significantly by the auxeticity of the star-shaped honeycomb. Some other interesting findings are also presented, such as the negative refraction and the self-collimation. The present study demonstrates the potential applications of the star-shaped honeycomb in phononic crystals, such as vibration isolation and the elastic waveguide.

Thermal Tuning of Band Structures in a One-Dimensional Phononic Crystal

2013 ◽  
Vol 81 (4) ◽  
Author(s):  
Zuguang Bian ◽  
Wei Peng ◽  
Jizhou Song
Keyword(s):  
Band Gap ◽  
Acoustic Waves ◽  
Vibration Isolation ◽  
Phononic Crystal ◽  
Phononic Crystals ◽  
Band Gaps ◽  
Polybutylene Terephthalate ◽  
Band Structures ◽  
One Dimensional ◽  
Thermal Tuning

Phononic crystals make the realization of complete acoustic band gaps possible, which suggests many applications such as vibration isolation, noise suppression, acoustic barriers, filters, wave guides, and transducers. In this paper, an analytic model, based on the transfer matrix method, is developed to study the band structures of bulk acoustic waves including SH-, P-, and SV-waves in a one-dimensional phononic crystal, which is formed by alternating strips of two different materials. The analysis is demonstrated by the phononic crystal of Ba0.7Sr0.3TiO3 (BST) and polybutylene terephthalate (PBT), whose elastic properties depend strongly on the temperature. The results show that some band gaps are very sensitive to the temperature. Depending on the wave mode, the center frequency of the first band gap may decrease over 25% and band gap width may decrease over 60% as the temperature increases from 30 °C to 50 °C. The transmission of acoustic waves in a finite phononic crystal is also studied through the coefficient of transmission power. These results are very useful for the design and optimization of thermal tuning of phononic crystals.

Acoustic Metamaterial With Fractal Coiling Up Space for Sound Blocking in a Deep Subwavelength Scale

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
Baizhan Xia ◽  
Liping Li ◽  
Jian Liu ◽  
Dejie Yu
Keyword(s):  
Wave Propagation ◽  
Band Structure ◽  
Sound Propagation ◽  
Phononic Crystals ◽  
The Self ◽  
Robust Filtering ◽  
Straight Channel ◽  
Acoustic Metamaterial ◽  
Self Similar

Inspired by fractal photonic/phononic crystals, the self-similar fractal technique is applied to design acoustic metamaterial. By replacing the straight channel of coiling up space with a smaller coiling up space, a class of topological architectures with fractal coiling up space is developed. The significant effect of the fractal-inspired hierarchy on the band structure with fractal coiling up space is systematically investigated. Furthermore, sound wave propagation in the acoustic metamaterial with the fractal coiling up space is comprehensively highlighted. Our results show that the acoustic metamaterial with higher-order fractal coiling up space exhibits deep subwavelength bandgaps, in which the sound propagation will be well blocked. Thus, this work provides insights into the role of the fractal hierarchy in regulating the dynamic behavior of the acoustic metamaterial and provides opportunities for the design of a robust filtering device in a subwavelength scale.

Controlling underwater sound propagation using 3-D-printed phononic crystals

2019 ◽  
Vol 146 (4) ◽  
pp. 3044-3045
Author(s):  
Ahmed Allam ◽  
Karim G. Sabra ◽  
Alper Erturk
Keyword(s):  
Sound Propagation ◽  
Phononic Crystals ◽  
Underwater Sound

Band structure and defect states in acoustic phononic crystals using expansion and micro-perforated chamber mufflers

2021 ◽  
Vol 263 (5) ◽  
pp. 1194-1205
Author(s):  
Adriano Mitsuo Goto ◽  
Victor Gustavo Ramos Costa Dos Santos ◽  
José Maria Campos Dos Santos
Keyword(s):  
Sound Propagation ◽  
Transmission Loss ◽  
Dynamic Stiffness ◽  
Forced Response ◽  
Phononic Crystals ◽  
Defect States ◽  
Sound Control ◽  
Duct Systems ◽  
Stiffness Matrices ◽  
Periodic Arrangement

The expansion and the micro-perforated chamber mufflers are acoustic silencers designed to attenuate the sound propagation at duct systems. These silencers can show interesting phononic crystals behavior when set periodically. The concept of phononic crystals still is an emerging topic in vibration and sound control. The periodic arrangement of acoustic silencers can provide a significant enhancement of the sound absorption due to the "wave filtering" property where the wave cannot propagate at certain frequency ranges, called stopbands or bandgaps. However, these properties may be affected by defects, like the break of the periodicity due to manufacturing errors. For the present work, the influence of some defects on the acoustic efficiency is investigated numerically for expansion and micro-perforated chamber mufflers. A direct and efficient approach is used to obtain the transfer and dynamic stiffness matrices. Simulated examples are used to calculate the forced response, transmission loss, and dispersion diagram, which are verified by other methods.

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