Maximizing acoustic band gap in phononic crystals via topology optimization

International Journal of Mechanical Sciences, Год журнала: 2024, Номер 270, С. 109107 - 109107

Опубликована: Фев. 15, 2024

Язык: Английский

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

Journal of Applied Mechanics, Год журнала: 2024, Номер 91(10)

Опубликована: Июль 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.

Язык: Английский

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Topology optimization of acoustic bandgap crystals for topological insulators

Engineering With Computers, Год журнала: 2024, Номер 40(4), С. 2581 - 2594

Опубликована: Янв. 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.

Язык: Английский

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

Materials, Год журнала: 2025, Номер 18(2), С. 377 - 377

Опубликована: Янв. 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.

Язык: Английский

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

Mechanical Systems and Signal Processing, Год журнала: 2024, Номер 224, С. 111975 - 111975

Опубликована: Сен. 30, 2024

Язык: 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, Год журнала: 2023, Номер 418, С. 116557 - 116557

Опубликована: Ноя. 4, 2023

Язык: Английский

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Multi-material topology optimization of phononic crystal considering isotropic/anisotropic materials

Computers & Structures, Год журнала: 2024, Номер 302, С. 107479 - 107479

Опубликована: Июль 19, 2024

Язык: Английский

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Optimal design of a novel nested metamaterial with hybrid auxetic-locally resonant band gap for suppressing robotic grinding vibration

Mechanics of Advanced Materials and Structures, Год журнала: 2024, Номер unknown, С. 1 - 12

Опубликована: Дек. 17, 2024

To suppress vibration during robotic grinding of aero-engine blades caused by low stiffness and point-to-point movement, a novel metamaterial comprising double-nested auxetic structure local resonator is proposed. It simultaneously achieves enhanced-stiffness an ultra-low frequency wide-range band gap generated the hybrid auxetic-locally resonant characteristic. Young's modulus studied analytically numerically. A co-simulation procedure applied to obtain optimized (the bottom boundary 18.03 Hz) based on modal analysis results, verified through experimental study. The design nested provides effective strategy for suppressing vibration.

Язык: Английский

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Three-field topology optimization of single-phase phononic crystals with desired bandgaps for elastic wave manipulation

Engineering Structures, Год журнала: 2024, Номер 326, С. 119554 - 119554

Опубликована: Дек. 27, 2024

Язык: 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, Год журнала: 2025, Номер 441, С. 118020 - 118020

Опубликована: Апрель 18, 2025

Язык: Английский

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