Waveguide propagation of microwave radiation in two-layer metamaterial

Veselago, V. G.; Vinogradov, E. A.; Голованов, В. И.; Zhukov, A. A.; Romanov, A. A.; Kapustyan, O. V.; Urlichich, Yuri M.; Lavrishchev, V. P.

doi:10.1134/s1063785011030163

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…Metamaterial has been developed to obtain the unique performance by the clever structural design and precision manufacturing relative to original natural materials [17][18][19][20]. In order to reduce the occupied space of a sound absorber with the desired sound absorption property, acoustic metamaterials with online tunable parameters have been developed [21][22][23][24][25][26], which can satisfy the requirements of limited total thickness and various noise spectrum, simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Study on a Hexagonal Acoustic Metamaterial Cell of Multiple Parallel-Connection Resonators with Tunable Perforating Rate

Cheng,

Yang,

Shen

et al. 2023

Materials

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The limited occupied space and various noise spectrum requires an adjustable sound absorber with a smart structure and tunable sound absorption performance. The hexagonal acoustic metamaterial cell of the multiple parallel-connection resonators with tunable perforating rate was proposed in this research, which consisted of six triangular cavities and six trapezium cavities, and the perforation rate of each cavity was adjustable by moving the sliding block along the slideway. The optimal geometric parameters were obtained by the joint optimization of the acoustic finite element simulation and cuckoo search algorithm, and the average sound absorption coefficients in the target frequency ranges of 650–1150 Hz, 700–1200 Hz and 700–1000 Hz were up to 0.8565, 0.8615 and 0.8807, respectively. The experimental sample was fabricated by the fused filament fabrication method, and its sound absorption coefficients were further detected by impedance tube detector. The consistency between simulation data and experimental data proved the accuracy of the acoustic finite element simulation model and the effectiveness of the joint optimization method. The tunable sound absorption performance, outstanding low-frequency noise reduction property, extensible outline structure and efficient space utilization were favorable to promote its practical applications in noise reduction.

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Section: Introductionmentioning

confidence: 99%

Study on a Hexagonal Acoustic Metamaterial Cell of Multiple Parallel-Connection Resonators with Tunable Perforating Rate

Cheng,

Yang,

Shen

et al. 2023

Materials

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“…In this case, cooling capacity

Q

is determined as follows 14 :

Q={W}_{\mathrm{out}}\frac{\left(K+1\right)\cdot tg\alpha}{K-{tg}^2\alpha }

and temperature difference Δ Т between the external medium and the anisotropic device, which is achieved by the adiabatic isolation of the faces of the plate

\Delta T=\frac{Q-{q}_{los}}{s\cdot M},

where

{q}_{los}

are losses due to cooling of electrically conductive and metal layers on the upper and lower faces of the converter, s is heat capacity, M is its weight.…”

Section: Possible Applications Of the Proposed Methods Of Energy Tran...mentioning

confidence: 99%

“…To create suggested devices (Figures 5, 6, and 7) already known as bipolar materials, for example, layer graphite received by the thermal schedule of liquid carbohydrates by the subsequent deposition of their pairs in the gravitational chamber can be used. This material will be characterized by the conversion factor m = 1, 5÷4 14,15 . also known materials on the basis of directed‐crystallized bare ewtetic A II B V – MeSb , where A II B V – CdSb , ZnAs 2 , Me‐Ni , Cr , Co , Fe and other elements of the transition group of the Mendeleyev table 16,17 .…”

Section: Methodsmentioning

confidence: 99%

“…This material will be characterized by the conversion factor m = 1, 5÷4. 14,15 also known materials on the basis of directed-crystallized bare ewtetic A II B V -MeSb, where A II B V -CdSb, ZnAs 2 , Me-Ni, Cr, Co, Fe and other elements of the transition group of the Mendeleyev table. 16,17 The coefficient of transformation m of these materials will be within the limits of 0,4÷0,8.…”

Section: Methodsmentioning

confidence: 99%

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The method of turbulent transformation of energy

Ashcheulov

Derevianchuk

Lavreniuk

2023

Engineering Reports

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Currently, new methods of energy transformation are of interest. The results of the researches in the directions of anisotropic transformation of electric energy show that the existing devices are characterized by a small coefficient of transformation. This is primarily due to the use of unipolar anisotropic materials and the appearance, as a result, in their volumes the electric vortices that are characterized by a laminar flow. This article proposes a new method of energy transformation, which is carried out by means of vortices with turbulent character of flow. According to our studies, such vortices appear in devices working on the basis of bipolar anisotropic materials. Depending on the characteristics of such material, they can be used as generators of electricity, heat, and cold. Their work is based on the transformation of the electric current by the bipolar anisotropic electric conductive medium and their further interaction with the external energy environment. These anisotropic materials in selected crystallographic directions are characterized by different p‐ and n‐types of conductivity providing the presence of ohmic contact between the layers. The leakage of the external electrical current of the sinusoidal form through this rectangular plate causes the appearance in its volume the electric current vortices with turbulent character of the current. For the first time it is shown that such a method of energy transformation is an effective mechanism that transfers energy between the external environment and the anisotropic plate.

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“…AMs exhibit new physical effects, which can be used to regulate the refraction, scattering, and absorption of sound waves, thereby achieving different acoustic functions, and have good application prospects [20][21][22][23][24][25][26]. Veselago et al [27][28][29] studied the wave propagation properties of waves in metamaterials and materials with a negative index of refraction, also called left-handed or metamaterials, and the extraordinary physical properties of metamaterials were further explained.…”

Section: Introductionmentioning

confidence: 99%

A New Multi-Mechanism Synergistic Acoustic Structure for Underwater Low-Frequency and Broadband Sound Absorption

Shi,

Li,

et al. 2023

JMSE

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The acoustic absorption characteristics of anechoic coatings attached to the surface of underwater vehicles are closely related to their acoustic stealth. Owing to the essential property of local resonance, the narrow sound-absorption band cannot meet the underwater broadband sound absorption requirements. To this end, a multi-mechanism synergistic composite acoustic structure (MMSC−AS) was designed according to the integration of multiple acoustic dissipation mechanisms in this paper. Then, the acoustical calculation model for MMSC−AS was developed by using the graded finite element method (G-FEM), and the feasibility and the correctness of the established acoustical calculation model were verified. The underwater sound absorption behaviors of MMSC−AS were studied, and the optimization of the sound absorption characteristics of the MMSC−AS was also carried out. The results indicated that the calculation accuracy of the G-FEM was better than that of the FEM under the condition of the same mesh elements. Moreover, there were many sound wave regulation mechanisms in the MMSC−AS, and the synergy between the mechanisms enriched the mode of sound acoustic energy dissipation, which could widen the absorption band with effect. This study provides theoretical and technical basis for breaking through the challenge of low-frequency and broadband acoustic structure design of underwater vehicles.

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Waveguide propagation of microwave radiation in two-layer metamaterial

Cited by 4 publications

References 4 publications

Study on a Hexagonal Acoustic Metamaterial Cell of Multiple Parallel-Connection Resonators with Tunable Perforating Rate

Study on a Hexagonal Acoustic Metamaterial Cell of Multiple Parallel-Connection Resonators with Tunable Perforating Rate

The method of turbulent transformation of energy

A New Multi-Mechanism Synergistic Acoustic Structure for Underwater Low-Frequency and Broadband Sound Absorption

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