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Underwater Directional Acoustic Source Based on pentamode material

Acta Mechanica Solida Sinica 2024年第1期37卷 1-9页

作者： Binghao Zhao Peng Wang Dongwei Wang Gengkai Hu School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Wuhan Second Ship Design and Research Institute Wuhan 430205China

An underwater directional acoustic emitter is conceived with a highly anisotropic lattice material,whose acoustic characteristics manifest strong dependence on the orientation of the lattice material’s principal axis.Exploiting these features,a cylindrical structure made of such anisotropic lattice material is engineered to possess distinct impedance values in different directions,thereby facilitating wave emission along the principal axis while inducing reflection in other directions.Notably,through numerical simulations,it is demonstrated that the emission direction can be effectively manipulated by adjusting the principal axis orientation,concurrently enhancing the emitted power.In contrast to previous directional acoustic structures,the compact emitter presented in this study can get rid of the size-wavelength constraint,enabling effective control of low-frequency waves.

关键词： Underwater Directional emission pentamode material Broadband frequency

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Scattering Analysis and Optimization of Spherical Acoustic Cloak with Unideal pentamode material

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Acta Mechanica Solida Sinica 2020年第3期33卷 347-360页

作者： Xin Nie Yi Chen Xiaoning Liu Key Laboratory of Dynamics and Control of Flight Vehicle Ministry of EducationSchool of Aerospace EngineeringBeijing Institute of TechnologyBeijing 100081China

The acoustic scattering is theoretically studied in this paper for three-dimensional spherical cloak composed of unideal pentamode material,for which small shear rigidity is always inevitable for a real designed microstructure.A theoretical formulation is developed to efficiently evaluate the cloaking performance.The generic scattering feature of the cloak and the efTects of material imperfectness and inner cloak boundary constraints are systematically examined.The preferable constraint type and the critical imperfectness parameter of the material are identified for possible broadband invisibility.In addition,a very practical lining shell scheme is proposed to tune the constraint strength on the inner boundary.By combining the theoretical model with optimization algorithm,it is further proved that the cloak can be reduced by several piecewiseuniform layers and optimized to achieve excellent invisibility in targeted frequency bands.The study will provide valuable guidance for the future microstructural design of cloaks.

关键词： pentamode material Spherical acoustic cloak Scattering calculation Boundary effect Optimization

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Design of elliptical underwater acoustic cloak with truss-latticed pentamode materials

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Theoretical & Applied Mechanics Letters 2022年第4期12卷 221-226页

作者： Yuanyuan Ge Xiaoning Liu Gengkai Hu School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

pentamode acoustic cloak is promising for underwater sound control due to its solid nature and broadband efficiency,however its realization is only limited to simple cylindrical shape.In this work,we established a set of techniques for the microstructure design of elliptical pentamode acoustic cloak based on truss lattice model,including the inverse design of unit cell and algorithms for latticed cloak assembly.The designed cloak was numerically validated by the well wave concealing performance.The work proves that more general pentamode acoustic wave devices beyond simple cylindrical geometry are theoretically feasible,and sheds light on more practical design for waterborne sound manipulation.

关键词： Elliptical acoustic cloak pentamode material Microstructure design Truss lattice

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