For three-dimensional pentamode metamaterials, it is of great significance to realize underwater low frequency acoustic wave control. Therefore, in order compare with traditional double-cone two multilayer composite cylindrical metamaterials and broad band gaps are proposed this paper. By using lattice constants on the centimeters, phononic below 60 Hz single-mode area 30 can be obtained. In addition, compared asymmetrical locally resonant lower edge frequency, relative bandwidth figure...

Abstract The topological simulation of acoustic waves has induced unconventional propagation characteristics, thereby offering extensive application potential in the field acoustics. In this paper, we propose a machine learning-assisted method for inverse design wave edge states and demonstrate its practical applicability. Leveraging predictions from trained artificial neural network algorithm, wide-bandwidth insulators is achieved, with results indicating an approximately 2.8-fold...

The Valley Hall effect and topological chiral boundary states play a crucial role in investigating elastic wave transmission properties. In this study, to construct the phononic crystal plate structure, periodic scatterer structures are arranged on bottom at certain thickness. Simulation analysis reveal that modulating edge of designed achieves greater degrees freedom enhanced backscattering suppression capabilities. Straight boundary, right-angle turning valley transport with defect...

Abstract The study of optical topological insulators (PTIs) has revealed intriguing properties that diversify the ways in which light can be manipulated, offering significant potential for a wide range applications. This paper presents machine learning (ML)-based approach reverse design PTIs. Using finite element methods, addresses challenge computing band structure dual-band model, enabling construction dataset suitable ML training. With goal maximizing bandgaps, employs random forest...

The reverse design method of acoustic structure based on a deep learning algorithm has been developed as an important means metamaterial design. In this paper, multi-band topological insulator is designed, and the improved competitive search Long Short-Term Memory (LSTM) model used to predict its potential optimal parameter combination assist on-demand working frequency band topology insulator. Finally, numerical simulation established using optimized structural parameters, topologically...

In this paper, we devise a pentamode metamaterial plate exhibiting topological characteristics. By organizing structural elements, boundary states are attained, effectively safeguarding propagation of elastic waves. Moreover, based on the numerical simulation model, employ polymer to fabricate macro-scale specimen via additive manufacturing. Through assessing vibrational response sample, corroborate its attributes in governing wave transmission. This discovery paves way for novel approach...

Abstract Drawing upon the physical phenomenon of polarization transformation, this paper proposes an ultra-broadband, high-efficiency linear converter composed a metallic grating, L-shaped patch, and dielectric substrate. The conversion properties have been scrutinized using finite element numerical simulation software CST. computational outcomes reveal that operates within frequency range 0.5 THz to 1.8 THz, exhibiting relative bandwidth 113%, transmission coefficient exceeding 0.87,...

In this paper, a tunable elastic topological insulator based on bicomponent is designed. We rotate the perforated structure of mixed components in two different ways, local and global, to reduce structural symmetry lattice obtain insulator. By introducing mixed-component with certain rotation angle into primitive cell, incomplete quadruple degenerate state constructed. When locally rotating component structure, separated reversed at Γ point, we can get properties. addition, without...

The topological simulation of acoustic waves has induced unconventional propagation characteristics, thereby offering extensive application potential in the field acoustics. In this paper, we propose a Machine Learning-assisted method for inverse design wave edge states and demonstrate its practical applicability. Leveraging predictions from trained artificial neural network algorithm, wide-bandwidth insulators is achieved, with results indicating an approximately 2.8-fold enlargement...

An elastic topological insulator with pseudo-spin characteristics is designed based on honeycomb lattice phononic crystals positive hexagonal carriers, which can realize path defect immunity and backscattering suppression transmission characteristics. By introducing a hexagon carrier certain size at the narrow diameter junction of two-dimensional structure to achieve symmetry breaking, four-fold accidental degeneracy point be obtained by adjusting cell parameters. The main variable primitive...

Abstract For three-dimensional pentamode metamaterials, it is of great significance to realize underwater ultra-low frequency acoustic wave control. Therefore, two types multilayer composite cylindrical metamaterials with and broad band gaps are proposed in this paper. By using lattice constants on the order centimeters, phononic below 60 Hz single-mode area 30Hz can be obtained. Compared asymmetrical double-cone locally resonant lower edge frequency, relative bandwidth figure merit first...