Size-dependent topology optimization for eigenfrequency maximization of microplates using consistent couple stress theory

Advances in Engineering Software, Год журнала: 2025, Номер 206, С. 103941 - 103941

Опубликована: Апрель 23, 2025

Язык: Английский

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Topology design of two dimensional viscoelastic phononic crystals for wave attenuation based on deep generative neural networks

Engineering Structures, Год журнала: 2025, Номер 336, С. 120313 - 120313

Опубликована: Апрель 23, 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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Topology Optimization of Wide‐Frequency Tunable Phononic Crystal Resonators with a Reconstructable Point Defect

Advanced Theory and Simulations, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

Abstract Phononic crystal (PnC) resonators and their dynamic regulation of wave transmission hold significant practical importance in the field acoustic energy harvesting. However, majority existing PnC are typically designed manufactured for fixed frequencies limited functionalities. Once these manufactured, achieving tunable characteristics becomes challenging. To address challenge, this study presents a topology optimization strategy based on an efficient point defect diagonally movement reconstruction mechanism. For broadest range various resonators, proposed involves use gradient‐free algorithm to successively design surrounding unit cells defects resonator, leading successful realization with customized functions. Optimization results from several examples demonstrate defect‐band frequency that covers almost entire bandgap. Furthermore, explores relationship between resonant diagonal moving distance Both numerical simulations experimental tests effectiveness creating wide‐frequency characteristics. It achieves real‐time automated resonance response changes external sound sources, offering novel approach designing harvesters within engineering domain.

Язык: Английский

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A matrix method for designing bandgap of stretch-dominated mechanical metamaterials

Journal of Sound and Vibration, Год журнала: 2025, Номер unknown, С. 119257 - 119257

Опубликована: Июнь 1, 2025

Язык: Английский

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Target-oriented inverse optimization design of phononic crystals with variable constraints for vibration attenuation

Journal of Vibration and Control, Год журнала: 2024, Номер unknown

Опубликована: Апрель 24, 2024

Previous research on phononic crystals (PnCs) design mostly focused the maximum band gap (BG) between adjacent orders and could not optimize desired target frequency based actual engineering problems. In order to achieve an arbitrarily specified BG structure of PnCs near frequency, a new topology method for is proposed using special triangular lattice PnC as object. genetic algorithm (GA) optimization framework, two variable constraint strategies, fixed-step adaptive, are form (VC-GA), which enables non gradient process be continuous uninterrupted. This model also divides into stages, can search individuals maximize under constraints BG. Combining with improved fast plane wave expansion (IFPWEM) optimizing single multi-objective BGs in in-plane out-of-plane modes, weight coefficient introduced broaden its scope application. The effectiveness verified through experiments, vibration reduction carried out within specific range corrugated plate example.

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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Investigation on enhanced band-gap properties of 2D hierarchical phononic crystals

Mechanical Systems and Signal Processing, Год журнала: 2024, Номер 223, С. 111827 - 111827

Опубликована: Авг. 23, 2024

Язык: Английский

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Isogeometric topology optimization for maximizing band gap of two-dimensional phononic crystal structures

Applied Mathematical Modelling, Год журнала: 2024, Номер 137, С. 115702 - 115702

Опубликована: Сен. 11, 2024

Язык: Английский

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Topological Design of Two-Dimensional Phononic Crystals Based on Genetic Algorithm

Materials, Год журнала: 2023, Номер 16(16), С. 5606 - 5606

Опубликована: Авг. 13, 2023

Phononic crystals are a kind of artificial acoustic metamaterial whose mass density and elastic modulus periodically arranged. The precise efficient design phononic with specific bandgap characteristics has attracted increasing attention in past decades. In this paper, an improved adaptive genetic algorithm is proposed for the reverse customization two-dimensional designed to maximize relative bandwidth at low frequencies. energy band dispersion relation transmission loss optimal structure calculated by finite-element method, effective wave-attenuation effect range verified. This provides solution custom-made metamaterials excellent low-frequency sound insulation or other engineering applications.

Язык: Английский

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