Band gap of piezoelectric/piezomagnetic phononic crystal with graded interlayer

2013 ◽  
Vol 225 (6) ◽  
pp. 1779-1794 ◽  
Author(s):  
Man Lan ◽  
Peijun Wei
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Graded Interlayer

scholarly journals Tunable Low Frequency Band Gap and Waveguide of Phononic Crystal Plates with Different Filling Ratio

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 828
Author(s):  
Shaobo Zhang ◽  
Jiang Liu ◽  
Hongbo Zhang ◽  
Shuliang Wang
Keyword(s):  
Band Gap ◽  
Composite Structure ◽  
Structural Parameters ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Filling Ratio ◽  
Height Ratio ◽  
Road Vehicles ◽  
Aluminum Base ◽  
Gap Width

Aiming at solving the NVH problem in vehicles, a novel composite structure is proposed. The new structure uses a hollow-stub phononic-crystal with filled cylinders (HPFC) plate. Any unit in the plate consists of a lead head, a silicon rubber body, an aluminum base as outer column and an opposite arranged inner pole. The dispersion curves are investigated by numerical simulations and the influences of structural parameters are discussed, including traditional hollow radius, thickness, height ratio, and the new proposed filling ratio. Three new arrays are created and their spectrum maps are calculated. In the dispersion simulation results, new branches are observed. The new branches would move towards lower frequency zone and the band gap width enlarges as the filling ratio decreases. The transmission spectrum results show that the new design can realize three different multiplexing arrays for waveguides and also extend the locally resonant sonic band gap. In summary, the proposed HPFC structure could meet the requirement for noise guiding and filtering. Compared to a traditional phononic crystal plate, this new composite structure may be more suitable for noise reduction in rail or road vehicles.

Band gap and defect state engineering in a multi-stub phononic crystal plate

2015 ◽  
Vol 117 (15) ◽  
pp. 154301 ◽  
Author(s):  
Ping Jiang ◽  
Xiao-Peng Wang ◽  
Tian-Ning Chen ◽  
Jian Zhu
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Crystal Plate ◽  
Defect State

scholarly journals Fano resonance based defected 1D phononic crystal for highly sensitive gas sensing applications

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shrouk E. Zaki ◽  
Ahmed Mehaney ◽  
Hekmat M. Hassanein ◽  
Arafa H. Aly
Keyword(s):  
Band Gap ◽  
Gas Sensor ◽  
Fano Resonance ◽  
Figure Of Merit ◽  
Phononic Crystal ◽  
Acoustic Properties ◽  
Effect Of Temperature ◽  
Sensing Applications ◽  
Damping Rate ◽  
Different Temperatures

Abstract The defected acoustic band gap materials are promising a new generation of sensing technology based on layered cavities. We introduced a novel 1D defected phononic crystal (1D-DPC) as a high-sensitive gas sensor based on the Fano resonance transmitted window. Our designed (Lead–Epoxy) 1D-DPC multilayer has filled with a defect layer with different gases at different temperatures. In this study, Fano resonance—based acoustic band gap engineering has used to detect several gases such as O2, CO2, NH3, and CH4. For the first time, Fano resonance peaks appeared in the proposed gas sensor structures which attributed to high sensitivity, Q-factor, and figure-of-merit values for all gases. Also, the relation between the Fano resonance frequency and acoustic properties of gases at different temperatures has been studied in detail. The effect of the damping rate on the sensitivity of the gas sensor shows a linear behavior for CO2, O2, and NH3. Further, we introduced the effect of temperature on the damping rate of the incident waves inside the 1D-DPC gas sensor. The highest sensitivity and figure of merit were obtained for O2 of 292 MHz/(kg/m3) and 647 m3/Kg, respectively. While the highest figure-of-merit value of 60 °C−1 at 30 °C was attributed to O2. The transfer matrix method is used for calculating the transmission coefficient of the incident acoustic wave. We believe that the proposed sensor can be experimentally implemented.

Waveguiding inside the complete band gap of a phononic crystal slab

2007 ◽  
Vol 76 (5) ◽  
Author(s):  
Fu-Li Hsiao ◽  
Abdelkrim Khelif ◽  
Hanane Moubchir ◽  
Abdelkrim Choujaa ◽  
Chii-Chang Chen ◽  
...  
Keyword(s):  
Band Gap ◽  
Phononic Crystal

Evidence of a large elastic band gap in a one-dimensional phononic crystal

2016 ◽  
Author(s):  
Etienne Coffy ◽  
Sebastien Euphrasie ◽  
Pascal Vairac ◽  
Abdelkrim Khelif
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Elastic Band ◽  
One Dimensional
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