Experimental Validation for Mechanically Tunable Defect Bands of a Reconfigurable Phononic Crystal with Permanent Magnets DOI Creative Commons

Jeonggyu Yang,

Soo-Ho Jo

Crystals, Journal Year: 2024, Volume and Issue: 14(8), P. 701 - 701

Published: Aug. 1, 2024

Phononic crystals (PnCs) have garnered significant attention due to their unique ability control elastic waves in unconventional ways. One area of research focuses on utilizing defects within PnCs. Defects create new pass bands band gaps, leading concentrated wave energy the defects. However, defect-mode-enabled localization is effective only at specific frequencies, limiting its usefulness when frequencies incident vary. Existing methods mechanically tune defect involve changing geometries unit cells or attaching foundations, which necessitates detachment and reattachment certain structures depending engineering situation. Considering these challenges, this study introduces a novel approach that utilizes reconfigurable PnC design, incorporating permanent magnets ferromagnetic materials. The case involves one-dimensional consisting long metal beam with rectangular block-shaped periodically arranged attached by magnetic forces. A created shifting subset parallel. extent parallel movement alters vibrating characteristics defect, facilitating mechanical defective PnC. effectiveness experimentally validated.

Language: Английский

Electroelastically coupled stiffness matrix method for phononic crystals with piezoelectric defects and its applications to filters, sensors, and energy harvesters DOI
Soo-Ho Jo

Mechanics of Materials, Journal Year: 2025, Volume and Issue: unknown, P. 105262 - 105262

Published: Jan. 1, 2025

Language: Английский

Citations

1
Concurrent generation and amplification of longitudinal and bending waves using defective phononic crystals DOI
Soo-Ho Jo

Applied Mathematics and Mechanics, Journal Year: 2025, Volume and Issue: 46(2), P. 269 - 288

Published: Jan. 30, 2025

Language: Английский

Citations

0
Programmable piezoelectric phononic crystal beams with shunt circuits: A deep learning neural network-assisted design strategy for real-time tunable bandgaps DOI
Gongye Zhang,

Xiu-Dong Gao,

Jun Hong

et al.

Journal of Applied Physics, Journal Year: 2024, Volume and Issue: 136(15)

Published: Oct. 18, 2024

A deep learning neural network-assisted design strategy for programmable piezoelectric phononic crystal (PnC) beams with shunt circuits is proposed. The feasibility of integrating into the tunable PnCs to achieve real-time vibration isolation demonstrated through numerical examples. influence (capacitance) on bandgaps studied by finite element (FE) simulations. results show that bandgap frequency and range vary capacitance electrode length. Moreover, incorporating supercell structures introduces an additional bandgap, significantly expanding demonstrating circuit modifications can tailor width bandgap. suite network (NN) algorithms developed predicting inversely designing PnC parameters, greatly accelerating calculation enabling faster inverse than existing models. accuracy NN verified comparing their predictions those from FE combination designed NNs enables reduction isolation. This successfully validated in a practical scenario involving train rails.

Language: Английский

Citations

3
Opening Bandgap in Monoatomic-diatomic Convertible Metamaterial with Nonlinearity DOI

Myung Hwan Bae,

Seung‐Hyun Kim, Hong Min Seung

et al.

International Journal of Mechanical Sciences, Journal Year: 2025, Volume and Issue: unknown, P. 110067 - 110067

Published: Feb. 1, 2025

Language: Английский

Citations

0
Phononic crystals with decoupled different defects enhance energy localization and harvesting performance DOI
Guoyu Zhang, Zi‐Jiang Liu, Yan Zhang

et al.

The Journal of the Acoustical Society of America, Journal Year: 2025, Volume and Issue: 157(4), P. 2697 - 2708

Published: April 1, 2025

Utilizing phononic crystals (PnCs) to enhance the performance of piezoelectric energy harvesting (PEH) devices is essential for addressing self-power challenges low-power devices. Building on prior research concerning incomplete line defect PnCs, this study presents a PnC designed with decoupled defects (i.e., point-defects and defects). The dispersion curve, localization, system were investigated. results indicate that as distance between two subsystems point-defect system) decreases, all constructed supercells exhibit decoupling properties. Notably, when reduced unit cells, demonstrates optimal broadband localization performance, achieving maximum output power 9.49 mW. Compared previous studies, exhibits superior capabilities, electrical increasing by factor 2.56 7.68. Consequently, offer novel insights strategies enhancing PEH through application PnCs multiple defects.

Language: Английский

Citations

0
Temperature-Controlled Defective Phononic Crystals with Shape Memory Alloys for Tunable Ultrasonic Sensors DOI Creative Commons
Soo-Ho Jo

Crystals, Journal Year: 2025, Volume and Issue: 15(5), P. 412 - 412

Published: April 28, 2025

Phononic crystals (PnCs) have garnered significant interest owing to their ability manipulate wave propagation, particularly through phononic band gaps and defect modes. However, conventional defective PnCs are limited by fixed defect-band frequencies, which restricts adaptability dynamic environments. This study introduces a novel approach for temperature-controlled tunability of integrating shape memory alloys (SMAs) into regions. The reversible phase transformations SMAs, driven temperature variations, induce changes in mechanical properties, enabling real-time adjustment frequencies. An analytical model is developed predict the relationship between temperature-modulated material properties shifts, validated numerical simulations. results demonstrate that frequencies can be dynamically controlled within specified range, thereby enhancing operational bandwidth ultrasonic sensors. Additionally, sensing-performance analysis confirms while shift with temperature, output voltage sensors remains stable, ensuring reliable sensitivity across varying conditions. represents advancement tunable PnC technology, paving way next-generation enhanced reliability complex

Language: Английский

Citations

0
Experimental Validation for Mechanically Tunable Defect Bands of a Reconfigurable Phononic Crystal with Permanent Magnets DOI Creative Commons

Jeonggyu Yang,

Soo-Ho Jo

Crystals, Journal Year: 2024, Volume and Issue: 14(8), P. 701 - 701

Published: Aug. 1, 2024

Phononic crystals (PnCs) have garnered significant attention due to their unique ability control elastic waves in unconventional ways. One area of research focuses on utilizing defects within PnCs. Defects create new pass bands band gaps, leading concentrated wave energy the defects. However, defect-mode-enabled localization is effective only at specific frequencies, limiting its usefulness when frequencies incident vary. Existing methods mechanically tune defect involve changing geometries unit cells or attaching foundations, which necessitates detachment and reattachment certain structures depending engineering situation. Considering these challenges, this study introduces a novel approach that utilizes reconfigurable PnC design, incorporating permanent magnets ferromagnetic materials. The case involves one-dimensional consisting long metal beam with rectangular block-shaped periodically arranged attached by magnetic forces. A created shifting subset parallel. extent parallel movement alters vibrating characteristics defect, facilitating mechanical defective PnC. effectiveness experimentally validated.

Language: Английский

Citations

2