Chiral phononic crystal-inspired railway track for low-frequency vibration suppression

International Journal of Mechanical Sciences, Год журнала: 2024, Номер 274, С. 109275 - 109275

Опубликована: Апрель 8, 2024

Язык: Английский

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

Mechanics of Materials, Год журнала: 2025, Номер unknown, С. 105262 - 105262

Опубликована: Янв. 1, 2025

Язык: Английский

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Polarization-independent full mode-converting elastic metasurfaces

International Journal of Mechanical Sciences, Год журнала: 2024, Номер 266, С. 108975 - 108975

Опубликована: Янв. 2, 2024

Язык: Английский

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Tunable bandpass filters using a defective phononic crystal shunted to synthetic negative capacitance for longitudinal waves

Journal of Applied Physics, Год журнала: 2024, Номер 135(16)

Опубликована: Апрель 22, 2024

This study illustrates the successful achievement of tunable defect bands in one-dimensional defective phononic crystals (PnCs) through incorporation piezoelectric defects with synthetic negative capacitances (SNCs) for first time. The efficacy SNCs creating bandpass filters across a broad frequency range is thoroughly examined using proposed analytical and numerical models. A newly developed electroelastically coupled transfer matrix that incorporates presented, considering either series or parallel connection between bimorph elements. Defect band transmittance analyses are conducted S-parameter methods. Two key findings emerge from this investigation. First, when total equivalent capacitance elements SNC becomes zero, representing point-symmetric defect-mode shape can be customized throughout entire bandgap. Second, constant value, resembling short-circuit conditions, highlights remarkable ability to tune without energy dissipation, paving way fully filters. To propel research forward, future investigations could explore expanding design space double defects, adopting enhanced modeling techniques account lateral shear effects, developing control algorithm automatic optimization values actively filters, incorporating artificial intelligence into methods electrical connections.

Язык: Английский

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Electrically controllable behaviors in defective phononic crystals with inductive-resistive circuits

International Journal of Mechanical Sciences, Год журнала: 2024, Номер 278, С. 109485 - 109485

Опубликована: Июнь 15, 2024

Язык: Английский

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Concurrent generation and amplification of longitudinal and bending waves using defective phononic crystals

Applied Mathematics and Mechanics, Год журнала: 2025, Номер 46(2), С. 269 - 288

Опубликована: Янв. 30, 2025

Язык: Английский

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Temperature-Controlled Defective Phononic Crystals with Shape Memory Alloys for Tunable Ultrasonic Sensors

Crystals, Год журнала: 2025, Номер 15(5), С. 412 - 412

Опубликована: Апрель 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

Язык: Английский

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

Crystals, Год журнала: 2024, Номер 14(8), С. 701 - 701

Опубликована: Авг. 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.

Язык: Английский

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Electrically controllable and reversible coupling degree in a phononic crystal with double piezoelectric defects

Thin-Walled Structures, Год журнала: 2024, Номер 204, С. 112328 - 112328

Опубликована: Авг. 8, 2024

Язык: Английский

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