Vertical V-shaped continuously tunable frequency-selective microcell structure based on shape memory alloy

Abstract

This invention relates to a vertical V-shaped continuously adjustable frequency-selective micro-unit structure based on shape memory alloys, comprising a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, insulation, and metal sheets; an array of multiple said metal sheets can constitute a frequency-selective surface for electromagnetic waves. Through structural design, this invention enables the frequency-selective surface to achieve continuous adjustment, thereby greatly improving the applicability of the frequency-selective surface and providing a solution to the complex electromagnetic environments faced by ground equipment or aircraft radar, thus expanding the practicality of frequency-selective surfaces.

Description

Technical Field

[0001] This invention relates to the field of aircraft structural design technology, specifically to a vertical V-shaped continuously adjustable frequency-selective micro-unit structure based on shape memory alloy. Background Technology

[0002] Shape memory alloys: alloys that exhibit shape memory effects through thermoelasticity and martensitic phase transformation and its inverse. By changing the temperature, the internal crystal phase of the material can be controlled, thereby allowing the structural geometry to change between two states.

[0003] Frequency selective surface (FSS): A periodic array structure composed of a large number of passive resonant micro-units. By designing the planar geometry and shape of the resonant micro-units, it can exhibit total reflection or total transmission of electromagnetic waves in a specific frequency band. Micro-unit structure: The smallest periodic unit structure of a frequency selective surface.

[0004] Traditional frequency selective surfaces, whose total reflection or total transmission characteristics are limited by the state of the micro-unit structure before leaving the factory, cannot be adjusted during use, which limits their ability to cope with complex and ever-changing operating environments. Summary of the Invention

[0005] Purpose of the invention:

[0006] This invention proposes a vertical V-shaped continuously adjustable frequency-selective microcell structure based on shape memory alloy. Utilizing the geometric deformation characteristics of shape memory alloy with temperature changes, it achieves continuous and real-time adjustment of the operating frequency band of the frequency-selective surface without affecting filtering quality.

[0007] Technical solution:

[0008] A vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy is proposed, including a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, an insulating barrier, and metal sheets; the array of multiple metal sheets can form a frequency-selective surface for electromagnetic waves;

[0009] The tip of the V-shaped shape memory alloy deformable body is a fixed end, and the two forked arms of the V-shaped shape memory alloy deformable body form free ends. The metal surface layer is fixedly installed on the top of the support frame, and the metal surface layer has a window. The fixed end of the V-shaped shape memory alloy deformable body is fixed to the support frame as a whole. The V-shaped shape memory alloy deformable body is set corresponding to the window. Each forked arm end of the V-shaped shape memory alloy deformable body is fixed with a metal sheet, and an insulating barrier is provided between the metal sheet and the forked arm end for isolation. The metal sheets fixed at the ends of the two forked arms overlap. When the V-shaped shape memory alloy deformable body is heated and deformed, the overlapping metal sheets will slide against each other, thereby changing the overall projected area of ​​the two overlapping metal sheets.

[0010] Furthermore, the metal surface layer is made of the same material as the metal sheet.

[0011] Furthermore, the metal surface layer is made of a different material than the metal sheet.

[0012] Furthermore, the metal sheet is made of copper.

[0013] Furthermore, the support frame has a fixed interface, and multiple support frames can be fixed as a whole, so that the metal surface layers on each support frame are arrayed to form a whole.

[0014] Furthermore, the V-shaped shape memory alloy deformable body is fixed to the support frame by adhesive or plugging.

[0015] A vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy is proposed, including a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, an insulating barrier, and metal sheets; the array of multiple metal sheets can form a frequency-selective surface for electromagnetic waves;

[0016] The tip of the V-shaped shape memory alloy deformable body is a fixed end, and the two forked arms of the V-shaped shape memory alloy deformable body form free ends. The metal surface layer is fixedly installed on the top of the support frame, and the metal surface layer has multiple windows in an array. The fixed ends of the multiple V-shaped shape memory alloy deformable bodies are all fixed to the support frame as a whole. Each V-shaped shape memory alloy deformable body corresponds to one window, and the two forked arms of each V-shaped shape memory alloy deformable body are fixed with metal plates. An insulating barrier is provided between the metal plates and the forked arm ends for isolation. The metal plates fixed to the two forked arm ends overlap. When the V-shaped shape memory alloy deformable body is heated and deformed, the overlapping metal plates will slide against each other, thereby changing the overall projected area of ​​the two overlapping metal plates.

[0017] See Figures 1a-1b Through repeated stretching training, the angle of the unit can be changed with temperature, thus enabling controllable deformation of the unit's projected area in the adjustable frequency-selective structure. By optimizing the insulation design between the fork arm and the metal sheet of the V-shaped unit, the frequency coupling problem of this type of unit structure is eliminated, improving the filtering quality of the frequency-selective unit.

[0018] Shape memory alloys are prepared through high and low temperature cycling to stabilize the state of the unit structure. By heating or cooling the micro-unit structure using a temperature control device (flow channels in the support structure or a bottom-covering heating plate), the continuously adjustable micro-unit structure can be changed between state 1 and state 2, thereby adjusting the filtering characteristics of the frequency-selective structure. The characteristic curve changes as follows: Figure 3 As shown.

[0019] Technical effects:

[0020] This invention, through structural design, enables the frequency selective surface to achieve continuous adjustable functionality, thereby greatly improving the applicability of the frequency selective surface and providing a solution for the complex electromagnetic environment faced by ground equipment or aircraft radar, thus expanding the practicality of the frequency selective surface. Attached Figure Description

[0021] Figure 1a This is a schematic diagram of the deformation of the micro-unit structure (fork arms combined).

[0022] Figure 1b This is a schematic diagram of the deformation of the micro-unit structure (fork arm open state).

[0023] Figure 2 Side view of a continuously adjustable micro-unit;

[0024] Figure 3 This is a schematic diagram of the structure of Example 2;

[0025] Among them: 1-metal sheet, 2-insulating material, 3-V-shaped shape memory alloy deformable body, 4-metal surface layer, 5-support frame. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1, see appendix Figures 1a-2 A vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy is proposed, including a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, an insulating barrier, and metal sheets; the array of multiple metal sheets can form a frequency-selective surface for electromagnetic waves;

[0028] The tip of the V-shaped shape memory alloy deformable body is a fixed end, and the two forked arms of the V-shaped shape memory alloy deformable body form free ends. The metal surface layer is fixedly installed on the top of the support frame, and the metal surface layer has a window. The fixed end of the V-shaped shape memory alloy deformable body is fixed to the support frame as a whole. The V-shaped shape memory alloy deformable body is set corresponding to the window. Each forked arm end of the V-shaped shape memory alloy deformable body is fixed with a metal sheet, and an insulating barrier is provided between the metal sheet and the forked arm end for isolation. The metal sheets fixed at the ends of the two forked arms overlap. When the V-shaped shape memory alloy deformable body is heated and deformed, the overlapping metal sheets will slide against each other, thereby changing the overall projected area of ​​the two overlapping metal sheets.

[0029] The metal surface layer is made of the same material as the metal sheet.

[0030] The metal sheet is made of copper.

[0031] The support frame has a fixed interface, and multiple support frames can be fixed as a whole, so that the metal surface layers on each support frame are arrayed to form a whole.

[0032] The V-shaped shape memory alloy deformable body is fixed to the support frame by adhesive.

[0033] Example 2, see appendix Figures 1a-3 A vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy is proposed, including a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, an insulating barrier, and metal sheets; the array of multiple metal sheets can form a frequency-selective surface for electromagnetic waves;

[0034] The tip of the V-shaped shape memory alloy deformable body is a fixed end, and the two forked arms of the V-shaped shape memory alloy deformable body form free ends. The metal surface layer is fixedly installed on the top of the support frame, and the metal surface layer has multiple windows in an array. The fixed ends of the multiple V-shaped shape memory alloy deformable bodies are all fixed to the support frame as a whole. Each V-shaped shape memory alloy deformable body corresponds to one window, and the two forked arms of each V-shaped shape memory alloy deformable body are fixed with metal plates. An insulating barrier is provided between the metal plates and the forked arm ends for isolation. The metal plates fixed to the two forked arm ends overlap. When the V-shaped shape memory alloy deformable body is heated and deformed, the overlapping metal plates will slide against each other, thereby changing the overall projected area of ​​the two overlapping metal plates.

[0035] The metal surface layer is made of the same material as the metal sheet.

[0036] The metal sheet is made of copper.

[0037] The V-shaped shape memory alloy deformable body is fixed to the support frame by adhesive or plugging.

[0038] The above description is merely a specific embodiment of the present invention, providing a detailed description of the invention. Parts not covered herein are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy, characterized in that: It includes a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, an insulating barrier, and metal sheets; the array of multiple said metal sheets can form a frequency-selective surface for electromagnetic waves; The tip of the V-shaped shape memory alloy deformable body is a fixed end, and the two forked arms of the V-shaped shape memory alloy deformable body form free ends. The metal surface layer is fixedly installed on the top of the support frame, and the metal surface layer has a window. The fixed end of the V-shaped shape memory alloy deformable body is fixed to the support frame as a whole. The V-shaped shape memory alloy deformable body is set corresponding to the window. Each forked arm end of the V-shaped shape memory alloy deformable body is fixed with a metal sheet, and an insulating barrier is provided between the metal sheet and the forked arm end for isolation. The metal sheets fixed at the ends of the two forked arms overlap. When the V-shaped shape memory alloy deformable body is heated and deformed, the overlapping metal sheets will slide against each other, thereby changing the overall projected area of ​​the two overlapping metal sheets.

2. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 1, characterized in that: The metal surface layer is made of the same material as the metal sheet.

3. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 1, characterized in that: The metal surface layer is made of a different material than the metal sheet.

4. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 2 or 3, characterized in that: The metal sheet is made of copper.

5. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 1, characterized in that: The support frame has a fixed interface, and multiple support frames can be fixed as a whole, so that the metal surface layers on each support frame are arrayed to form a whole.

6. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 1, characterized in that: The V-shaped shape memory alloy deformable body is fixed to the support frame by adhesive or plugging.

7. A vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy, characterized in that: It includes a metal surface layer, a support frame, a V-shaped shape memory alloy deformable body, an insulating barrier, and metal sheets; the array of multiple said metal sheets can form a frequency-selective surface for electromagnetic waves; The tip of the V-shaped shape memory alloy deformable body is a fixed end, and the two forked arms of the V-shaped shape memory alloy deformable body form free ends. The metal surface layer is fixedly installed on the top of the support frame, and the metal surface layer has multiple windows in an array. The fixed ends of the multiple V-shaped shape memory alloy deformable bodies are all fixed to the support frame as a whole. Each V-shaped shape memory alloy deformable body corresponds to one window, and the two forked arms of each V-shaped shape memory alloy deformable body are fixed with metal plates. An insulating barrier is provided between the metal plates and the forked arm ends for isolation. The metal plates fixed to the two forked arm ends overlap. When the V-shaped shape memory alloy deformable body is heated and deformed, the overlapping metal plates will slide against each other, thereby changing the overall projected area of ​​the two overlapping metal plates.

8. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 7, characterized in that: The metal surface layer is made of the same material as the metal sheet.

9. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 7, characterized in that: The metal surface layer is made of a different material than the metal sheet.

10. The vertical V-shaped continuously tunable frequency-selective micro-unit structure based on shape memory alloy according to claim 8 or 9, characterized in that: The metal sheet is made of copper.

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