Maximizing acoustic band gap in phononic crystals via topology optimization

International Journal of Mechanical Sciences, Journal Year: 2024, Volume and Issue: 270, P. 109107 - 109107

Published: Feb. 15, 2024

Language: Английский

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Topology optimization of acoustic bandgap crystals for topological insulators

Engineering With Computers, Journal Year: 2024, Volume and Issue: 40(4), P. 2581 - 2594

Published: Jan. 27, 2024

Abstract Recent advances in topology optimization methods have driven the development of bandgap crystals. These artificial materials with maximized operational bandwidth provide basis for wave manipulation and investigating topological phase matter. However, it is still challenging to efficiently design acoustic crystals via existing methods. Most previous studies considering only a volume fraction constraint on constituent material may impractical wide band gaps due pseudo-air resonant modes. To solve this issue, paper establishes new method creating periodically composed solid air. We adopt air permeability ensure connective channels within periodic microstructures, which more applicable engineering practice. The optimized unit cells from proposed are further analyzed realize topologically protected states, providing opportunities multi-dimensional systems. Numerical examples demonstrate effectiveness designing broad bandgaps any given orders, gapped/gapless edge states corner can be achieved resulting insulators.

Language: Английский

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Topology optimization of hard-magnetic soft phononic structures for wide magnetically tunable band gaps

Journal of Applied Mechanics, Journal Year: 2024, Volume and Issue: 91(10)

Published: July 9, 2024

Abstract Hard-magnetic soft materials, which exhibit finite deformation under magnetic loading, have emerged as a promising class of active materials for the development phononic structures with tunable elastic wave band gap characteristics. In this paper, we present gradient-based topology optimization framework designing hard-magnetic materials-based two-phase wide and magnetically anti-plane shear gaps. The incompressible Gent hyperelastic material model, along ideal is used to characterize constitutive behavior structure phases. To extract dispersion curves, an in-house element model in conjunction Bloch’s theorem employed. method moving asymptotes iteratively update design variables obtain optimal distribution phases within unit cell. Analytical sensitivity analysis performed evaluate gradient maximization function respect each one variables. Numerical results show that optimized width comparison standard central circular inclusion, demonstrating effectiveness proposed numerical framework. presented study, derived conclusions, can serve valuable guide futuristic manipulators.

Language: Английский

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Topology Design of Soft Phononic Crystals for Tunable Band Gaps: A Deep Learning Approach

Materials, Journal Year: 2025, Volume and Issue: 18(2), P. 377 - 377

Published: Jan. 15, 2025

The phononic crystals composed of soft materials have received extensive attention owing to the extraordinary behavior when undergoing large deformations, making it possible provide tunable band gaps actively. However, inverse designs them mainly rely on gradient-driven or gradient-free optimization schemes, which require sensitivity analysis cause time-consuming, lacking intelligence and flexibility. To this end, a deep learning-based framework conditional variational autoencoder multilayer perceptron is proposed discover mapping relation from topology layout applied with prestress. nonlinear superelastic neo-Hookean model employed describe constitutive characteristics, based structures are obtained via transfer matrix method accompanied Bloch theory. results show that data-driven approach can efficiently rapidly generate multiple candidates predicted in accord each other also consistent prescribed targets, verifying accuracy flexibility simultaneously. Furthermore, generalization performance, design space deeply exploited obtain desired whose stop bands characterized by wider bandwidth, lower location, enhanced wave attenuation performance.

Language: Английский

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Forward-backstepping design of phononic crystals with anticipated band gap by data-driven method

Mechanical Systems and Signal Processing, Journal Year: 2024, Volume and Issue: 224, P. 111975 - 111975

Published: Sept. 30, 2024

Language: Английский

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Floating projection topology optimization framework for efficient design of bi-connected 3D acoustic metamaterials

Computer Methods in Applied Mechanics and Engineering, Journal Year: 2025, Volume and Issue: 441, P. 118020 - 118020

Published: April 18, 2025

Language: Английский

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

Advances in Engineering Software, Journal Year: 2025, Volume and Issue: 206, P. 103941 - 103941

Published: April 23, 2025

Language: Английский

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

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

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Topology Optimization of Wide‐Frequency Tunable Phononic Crystal Resonators with a Reconstructable Point Defect

Advanced Theory and Simulations, Journal Year: 2025, Volume and Issue: unknown

Published: April 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.

Language: Английский

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A method for eliminating local modes caused by isolated structures in dynamic topology optimization

Computer Methods in Applied Mechanics and Engineering, Journal Year: 2023, Volume and Issue: 418, P. 116557 - 116557

Published: Nov. 4, 2023

Language: Английский

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