Broadband topological valley transport of elastic wave in reconfigurable phononic crystal plate

2021 ◽  
Vol 118 (6) ◽  
pp. 063502
Author(s):  
Nan Gao ◽  
Sichao Qu ◽  
Liang Si ◽  
Jiao Wang ◽  
Weiqiu Chen
Keyword(s):  
Elastic Wave ◽  
Phononic Crystal ◽  
Crystal Plate

scholarly journals Tunable characteristics of low-frequency bandgaps in two-dimensional multivibrator phononic crystal plates under prestrain

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hai-Fei Zhu ◽  
Xiao-Wei Sun ◽  
Ting Song ◽  
Xiao-Dong Wen ◽  
Xi-Xuan Liu ◽  
...  
Keyword(s):  
Phononic Crystal ◽  
Real Life ◽  
Low Frequency ◽  
Acoustic Vibration ◽  
Crystal Plate ◽  
Frequency Noise ◽  
Two Dimensional ◽  
The Matrix ◽  
Noise Frequency ◽  
Realtime Control

AbstractIn view of the influence of variability of low-frequency noise frequency on noise prevention in real life, we present a novel two-dimensional tunable phononic crystal plate which is consisted of lead columns deposited in a silicone rubber plate with periodic holes and calculate its bandgap characteristics by finite element method. The low-frequency bandgap mechanism of the designed model is discussed simultaneously. Accordingly, the influence of geometric parameters of the phononic crystal plate on the bandgap characteristics is analyzed and the bandgap adjustability under prestretch strain is further studied. Results show that the new designed phononic crystal plate has lower bandgap starting frequency and wider bandwidth than the traditional single-sided structure, which is due to the coupling between the resonance mode of the scatterer and the long traveling wave in the matrix with the introduction of periodic holes. Applying prestretch strain to the matrix can realize active realtime control of low-frequency bandgap under slight deformation and broaden the low-frequency bandgap, which can be explained as the multiple bands tend to be flattened due to the localization degree of unit cell vibration increases with the rise of prestrain. The presented structure improves the realtime adjustability of sound isolation and vibration reduction frequency for phononic crystal in complex acoustic vibration environments.

scholarly journals A Phononic Crystal with Differently Configured Double Defects for Broadband Elastic Wave Energy Localization and Harvesting

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 643
Author(s):  
Soo-Ho Jo ◽  
Byeng D. Youn
Keyword(s):  
Elastic Wave ◽  
Wave Energy ◽  
Phononic Crystal ◽  
Square Lattice ◽  
Energy Localization ◽  
Piezoelectric Patch ◽  
Single Defect ◽  
Piezoelectric Energy ◽  
Piezoelectric Effects ◽  
Elastic Wave Energy

Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems to broaden the bandwidth. However, these prior studies are limited to examining an identical configuration of the double defects. Therefore, this paper aims to propose a new design concept for PnCs that examines differently configured double defects for broadband elastic wave energy localization and harvesting. For example, a square-pillar-type unit cell is considered and a defect is considered to be a structure where one piezoelectric patch is bonded to a host square lattice in the absence of a pillar. When the double defects introduced in a PnC are sufficiently distant from each other to implement decoupling behaviors, each defect oscillates like a single independent defect. Here, by differentiating the geometric dimensions of two piezoelectric patches, the defects’ dissimilar equivalent inertia and stiffness contribute to individually manipulating defect bands that correspond to each defect. Hence, with adequately designed piezoelectric patches that consider both the piezoelectric effects on shift patterns of defect bands and the characteristics for the output electric power obtained from a single-defect case, we can successfully localize and harvest the elastic wave energy transferred in broadband frequencies.

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

A highly sensitive compact liquid sensor based on slotted phononic crystal plates

Lab on a Chip ◽  
2016 ◽  
Vol 16 (23) ◽  
pp. 4595-4600 ◽  
Author(s):  
Chen Wang ◽  
Feiyan Cai ◽  
Fei Li ◽  
Long Meng ◽  
Jiangyu Li ◽  
...  
Keyword(s):  
Phononic Crystal ◽  
High Sensitivity ◽  
Crystal Plate ◽  
Liquid Sample ◽  
Highly Sensitive

We report a slotted phononic crystal plate (SPCP) sensor detecting a small amount of liquid sample with a high sensitivity.

Band gap in tubular pillar phononic crystal plate

Ultrasonics ◽  
2016 ◽  
Vol 71 ◽  
pp. 172-176 ◽  
Author(s):  
Fengfeng Shu ◽  
Yongshun Liu ◽  
Junfeng Wu ◽  
Yihui Wu
Keyword(s):  
Band Gap ◽  
Phononic Crystal ◽  
Crystal Plate
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