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A waveguide stealth device applied to water waves and its design method

A water wave and waveguide technology, applied in the field of waveguide cloaking devices, can solve the problem of reducing wave amplitude and achieve the effect of wave amplitude reduction

Active Publication Date: 2021-08-31
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In previous theoretical research and practice, there has been no effective way to reduce the wave amplitude

Method used

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  • A waveguide stealth device applied to water waves and its design method
  • A waveguide stealth device applied to water waves and its design method
  • A waveguide stealth device applied to water waves and its design method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Take an isosceles trapezoidal gentle slope structure composed of a slope section curved panel 1 and a horizontal section flat plate 2 as the body, and set a slope section with a length of 1.78m and a width of 0.15m at both ends of the similar trapezoidal gentle slope structure. The side is a height-gradient curved surface; the middle horizontal section area is set to a horizontal section with a length of 2.44m, a height of 0.133m, and a width of 0.15m. The total length of the body is 6m. The body is arranged side by side in the waveguide along the direction of water wave propagation; the top view is as follows: figure 1 As shown, the cross-sectional view is as figure 2 shown;

[0075] (2) When the body of the similar trapezoidal gentle slope structure is immersed in water, the water depth at the bottom of the body is h, h=0.15m; the height distribution of the body along the x-axis direction is recorded as d(x), then the water depth at the bottom of the body The wa...

Embodiment 2

[0087] (1) Take a plurality of cylinders with different diameters and an array spacing of 0.5m to form the main body of the cloaking device, arrange them in 13 rows, with 3 cylinders in each row, and the total length L of the main body is 6m. and the cylinders with the same spacing, the length is L 1 is 2m, such as image 3 and Figure 4 shown;

[0088] (2) The body is arranged in the water tank along the direction of water wave propagation. Let the direction of water wave propagation be the x-axis and the water depth direction as the y-axis. When the body is immersed in water, the water depth at the bottom of the body is 0.5m, and the height of the body is 0.7m. The body is equally spaced along the x-axis direction, and the refractive index distribution of the body along the x-axis direction is recorded as n(x), and n(x) satisfies the formula in the x direction:

[0089] 1) When -11 , then the refractive index of this region can be expressed as: n2(x)=N 1 =1.5

[0090] 2...

Embodiment 3

[0098](1) Take five right-angled trapezoidal structures composed of slope section curved panels and horizontal section flat plates and arrange them side by side continuously as the main body; set a slope section with a length of 1.78m and a width of 0.15m at one end of the right-angled trapezoidal gentle slope structure, and the slope section The side is a height-gradient curved surface; the middle horizontal section area is set to a horizontal section with a length of 4.22m, a height of 0.133m, and a width of 0.15m. The total length of the main body is 6m. The main body is arranged side by side in the waveguide along the direction of water wave propagation; Figure 5 As shown, the cross-sectional view is as Figure 6 shown;

[0099] (2) When the body of the quasi-right-angled trapezoidal structure is immersed in water, the water depth at the bottom of the body is h, where h=0.15m; the height distribution of the body along the x-axis direction is denoted as d(x), and the The ...

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Abstract

The invention discloses a waveguide cloaking device applied to water waves and a design method thereof, which includes a body, and the body is two isosceles trapezoidal structures arranged side by side. Or, the body is a plurality of right-angled trapezoidal structures arranged continuously side by side with slope sections with gradually changing heights at one end. Or, the body is a pile structure formed by a plurality of cylindrical arrays. After design, the quasi-trapezoidal isosceles structure, quasi-right-angled trapezoidal structure or array pile structure can greatly reduce the wave amplitude in the middle of the waveguide when a plane wave with a specific wavelength and frequency is incident, thereby achieving a stealth effect.

Description

technical field [0001] The invention relates to the field of wave theory and engineering technology, in particular to a waveguide cloaking device applied to water waves and a design method thereof. Background technique [0002] When a plane wave encounters a solid structure, it will always be reflected, causing the wave field around the solid structure to be disordered and no longer maintain the characteristics of a plane wave. The wave exerts force on the structure in the water during the propagation process, and the floating body structure on the water surface will shake with the wave, and the amplitude of the plane wave is difficult to be reduced. In previous theoretical research and practice, there has been no effective way to reduce the wave amplitude. Contents of the invention [0003] The purpose of the present invention is to address the deficiencies of the prior art, to provide a wave control device and design method with wave-absorbing effect, which solves the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/00G02B27/00
CPCG02B6/00G02B27/0012
Inventor 王振宇陈焕阳徐亚东
Owner ZHEJIANG UNIV
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