Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Wang, Huaping; Zhang, Lei; Shah, Shahnawaz; Zhu, Rongrong; Zheng, Bin

doi:10.1038/s41598-021-91146-x

Cited by 4 publications

(2 citation statements)

References 26 publications

(28 reference statements)

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“…Acoustic metamaterials, a significant subset of metamaterials, can offer unparalleled control over sound waves, leading to extraordinary capabilities [9][10][11][12][13][14][15][16], including invisibility cloaks that render obstacles undetectable [17,18], meta-surfaces that guide and control sound trajectories [19][20][21], and flat acoustic lenses with the power to concentrate sound waves [22]. Pentamode metamaterials (PMs) are one kind of acoustic metamaterials, and maintain fluid-like properties.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Pentamode Metamaterials: Properties, Manufacturing, and Applications

Zhou,

Li,

Sun

et al. 2024

Crystals

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Metamaterials are artificial materials with properties depending mainly on their designed structures instead of their materials. Pentamode metamaterials are one type of metamaterial. They have solid structures with fluid-like properties, which can only withstand compressive stresses, not shear stresses. Two-dimensional pentamode metamaterials are easier to manufacture than three-dimensional models, so they have received wide attention. In this review, the properties, manufacturing, and applications of two-dimensional pentamode metamaterials will be discussed. Their water-like properties are their most important properties, and their velocities and anisotropy can be designed. They can be processed by wire-cut electrical discharge machining, waterjet cutting, and additive manufacturing techniques. They have a broad application prospect in acoustic fields such as acoustic stealth cloaks, acoustic waveguides, flat acoustic focusing lenses, pentamode acoustic meta-surfaces, etc.

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Section: Introductionmentioning

confidence: 99%

Two-Dimensional Pentamode Metamaterials: Properties, Manufacturing, and Applications

Zhou,

Li,

Sun

et al. 2024

Crystals

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“…The idea of transformation medium for concentrating wave energy has received great attention. Wang et al [22] used a linear transformation function to design an acoustic wave rotary-concentrating device with homogeneous materials, which would be provided a theoretical support in fields of communication and acoustic sensing. Fakheri et al [23] adopted the transformation acoustic theory to design an arbitrary shaped acoustic concentrator with natural homogeneous materials by effective medium theory.…”

Section: Introductionmentioning

confidence: 99%

Guide and control of thermal conduction with isotropic thermodynamic parameters based on a rotary-concentrating device

Liu

Yan²

2023

Chinese Phys. B

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In this paper, a rotary-concentrating device for thermal conduction is constructed to control and guide thermal energy transmitting in elastic plates. The designed device has the ability of concentrating for thermal conduction and controlling the processes of thermal diffusion in a plate. The multilayered isotropic material properties of the rotary-concentrating device are derived based on the transformation and rotary medium method and a rotation parameter to control the thermal diffusion process is introduced. The efficiency of the rotary-concentrating device for thermal conduction is verified. Stability of temperature fields in a plate with the rotary-concentrating device is analyzed to study the performance of rotary-concentrating. Numerical examples show that the constructed rotary-concentrating device for thermal conduction can effective rotate and focus on the thermal energy into the device for a wide range of diffusion temperatures, which can enhance the thermal conduction. Therefore, this study can provide a theoretical support for potential applications in fields of energy harvesting and thermal conduction control.

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Diffusionics: Basic Theory and Theoretical Framework

Zhuang

2024

Diffusionics

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Diffusionics, distinct from traditional physical laws, focuses on designing material parameters to actively control diffusion fields. The introduction of transformation theory provides a novel method to achieve active control of diffusion transport, leading to the design of devices with unique functions such as cloaks, concentrators, and rotators. However, materials corresponding to the parameters designed by transformation theory are challenging to find in nature. Therefore, the spatial arrangement of one or multiple materials to effectively achieve the desired parameters has become an alternative approach, indirectly spurring the development of metamaterials. This article reviews the fundamental theories and theoretical framework in diffusion science. We first introduce the basic concept of transformation theory, followed by a review of alternative theories such as effective medium theory and scattering cancellation theory. To study topological phenomena in diffusion systems and space-time modulated systems, the foundations of quantum mechanics, namely matrix mechanics and wave mechanics, are employed. Lastly, the article summarizes some challenges in diffusion science theory, which may be addressed by other methods in the future, such as transformation field methods and machine learning approaches.

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Homogeneous material based acoustic concentrators and rotators with linear coordinate transformation

Cited by 4 publications

References 26 publications

Two-Dimensional Pentamode Metamaterials: Properties, Manufacturing, and Applications

Two-Dimensional Pentamode Metamaterials: Properties, Manufacturing, and Applications

Guide and control of thermal conduction with isotropic thermodynamic parameters based on a rotary-concentrating device

Diffusionics: Basic Theory and Theoretical Framework

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