Reflection structure of terahertz FOD radar and radar

Abstract

The utility model discloses a terahertz FOD radar and a reflection structure thereof, according to the terahertz FOD radar reflection structure, a back frame comprises a skin and a foam core layer filled in the skin, the skin is made of a carbon fiber composite material, the skin comprises a back skin part and a reflection skin part, an installation fixing piece is connected with the back skin part, and the reflection skin part is connected with the back skin part. A reflection profiling surface is arranged on the reflection skin part, and a reflection layer is arranged on the reflection profiling surface. The skin made of the carbon fiber material is matched with the foam core layer to form the sandwich structure, on one hand, compared with a conventional metal frame, the weight of the frame is reduced, the strength of the frame is guaranteed, and the load of a servo system is reduced; on one hand, the foam core layer can effectively absorb and attenuate wind vibration and mechanical vibration, restrain resonance and reduce phase noise, and on the other hand, the surface precision failure caused by thermal expansion and cold contraction is eliminated, and the long-term focusing capability of terahertz wave beams is ensured.

Description

Technical Field

[0001] This utility model relates to the field of terahertz FOD radar technology, and in particular to a terahertz FOD radar reflection structure. Background Technology

[0002] Terahertz FOD radar relies on reflector antennas to focus and direct electromagnetic waves. Its performance is highly dependent on the surface accuracy of the reflector (i.e., the degree to which the geometry of the reflector matches the ideal parabola). Traditional reflector frames often use metal back frames made of aluminum alloy or Invar, which have the following problems: 1. Heavy weight: Large metal back frames are very bulky, hindering rapid radar deployment and agile rotation of the servo system. 2. Sensitivity to thermal deformation: Metal materials have a high coefficient of thermal expansion. Changes in ambient temperature (such as sunlight and diurnal temperature variations) can cause the frame to expand and contract, causing the reflector to deviate from the ideal shape, resulting in decreased gain, beam distortion, and severely affecting high-precision detection in the terahertz band. 3. Susceptibility to vibration: Wind loads, motor vibrations, etc., can easily cause frame resonance, leading to high-frequency jitter of the reflector and affecting signal quality. Therefore, in practical use, even if the surface accuracy of the reflector meets the requirements, the reflector frame itself still has a significant impact on radar performance. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model proposes a terahertz FOD radar reflection structure.

[0004] The present invention proposes a terahertz FOD radar reflection structure, comprising: a back frame and mounting fasteners;

[0005] The back frame includes a skin and a foam core layer filled inside the skin. The skin is made of carbon fiber composite material and includes a back skin part and a reflective skin part. The back skin part is connected by a mounting fastener. The reflective skin part is provided with a reflective contour surface, and a reflective layer is provided on the reflective contour surface.

[0006] Preferably, the skin is formed by laminating and curing multiple carbon fiber layers.

[0007] Preferably, the skin is formed in one piece using a mold.

[0008] Preferably, the mounting fastener is a metal insert pre-embedded and fixed to the back skin portion.

[0009] Preferably, the foam core layer is made of high-strength closed-cell foam.

[0010] Preferably, the foam core layer is made of polymethacrylamide foam.

[0011] This invention also includes a terahertz FOD radar, comprising the aforementioned reflective structure.

[0012] Preferably, it includes a transmission channel and a receiving channel;

[0013] The transmitting channel includes a first reflective structure as the transmitting end reflective structure, and the receiving channel includes a second reflective structure as the receiving end reflective structure.

[0014] In this invention, the proposed terahertz FOD radar and its reflective structure include a back frame comprising a skin and a foam core layer filled inside the skin. The skin is made of carbon fiber composite material and includes a back skin portion and a reflective skin portion. A mounting fastener connects the back skin portion, and the reflective skin portion has a reflective contoured surface with a reflective layer. The combination of the carbon fiber skin and the foam core layer forms a sandwich structure. On one hand, compared to conventional metal frames, this reduces frame weight while maintaining frame strength, thus reducing the load on the servo system. On the other hand, the thermal expansion coefficients of the carbon fiber material and the foam core layer are significantly reduced, eliminating surface accuracy failures caused by thermal expansion and contraction, ensuring the long-term focusing capability of the terahertz beam. Furthermore, the foam core layer can effectively absorb and attenuate wind vibration and mechanical vibration, suppress resonance, and reduce phase noise. Attached Figure Description

[0015] Figure 1 This is an exploded structural diagram of one embodiment of the reflection structure of a terahertz FOD radar proposed in this utility model.

[0016] Figure 2 This is a schematic diagram of one embodiment of the reflection structure of a terahertz FOD radar proposed in this utility model.

[0017] Figure 3 This is a schematic diagram of the geometric model of the reflection structure of the transmitting and receiving channels in one embodiment of the terahertz FOD radar proposed in this utility model.

[0018] Figure 4 This invention presents a Mises stress simulation cloud map of a terahertz FOD radar under a wind load of level 10 in a forward blowing condition, as proposed in this utility model.

[0019] Figure 5 This invention presents a simulation cloud map of the displacement of a terahertz FOD radar under a wind load of level 10 in a forward blowing condition, as proposed in this utility model.

[0020] Figure 6 This invention presents a Mises stress simulation cloud map of a terahertz FOD radar under an overall rotational speed of 6 r / min, as proposed in one embodiment of the radar.

[0021] Figure 7This invention presents a simulation cloud map of the displacement of a terahertz FOD radar at an overall rotational speed of 6 r / min, as proposed in one embodiment of the radar. Detailed Implementation

[0022] Reference Figure 1 and 2 The present invention proposes a terahertz FOD radar reflection structure, a back frame and mounting fastener 4;

[0023] The back frame includes a skin 1 and a foam core layer 2 filled inside the skin 1. The skin 1 is made of carbon fiber composite material. The skin 1 includes a back skin part 11 and a reflective skin part 12. The mounting fastener 4 connects the back skin part 11. The reflective skin part 12 is provided with a reflective contour surface, and the reflective contour surface is provided with a reflective layer 3.

[0024] In this embodiment, the proposed terahertz FOD radar reflection structure includes a back frame comprising a skin and a foam core layer filled inside the skin. The skin is made of carbon fiber composite material and includes a back skin portion and a reflective skin portion. A mounting fastener connects the back skin portion, and the reflective skin portion has a reflective contoured surface with a reflective layer. The combination of the carbon fiber skin and the foam core layer forms a sandwich structure. On one hand, compared to a conventional metal frame, this reduces the frame weight while maintaining frame strength, thus reducing the load on the servo system. On the other hand, the thermal expansion coefficients of the carbon fiber material and the foam core layer are significantly reduced, eliminating surface accuracy failures caused by thermal expansion and contraction, ensuring the long-term focusing capability of the terahertz beam. Furthermore, the foam core layer can effectively absorb and attenuate wind vibration and mechanical vibration, suppress resonance, and reduce phase noise.

[0025] In the specific processing of the skin, skin 1 is formed integrally using a mold. The carbon fiber composite surface layer is formed by stacking multiple layers of carbon fiber prepreg according to an optimized layup angle, and then curing it in a high-precision mold conforming to the target parabolic surface. Specifically, the back skin portion of the radar reflection structure is formed by a precision mold. The surface of the reflective skin portion is either flat or a contoured surface designed according to the back skin portion, and is formed by a precision mold to have a high-precision profile consistent with the target reflective surface. The reflective layer is directly glued or installed on the reflective skin portion through a transition structure.

[0026] In the specific processing, multiple carbon fiber layers are first laminated and cured together in a mold to form a skin 1. Then, a structural foam core layer is filled and firmly bonded under the carbon fiber composite skin, together forming the basic frame of a complete high-stiffness sandwich structure. Specifically, the foam core layer 2 uses high-strength closed-cell foam to ensure the foam's support and shock absorption effect. For example, polymethacrylamide foam can be used.

[0027] In the specific installation method, the mounting fastener 4 is fixed to the back skin part 11 by pre-embedding a metal insert.

[0028] In practical applications, the transmitting and receiving channels of a terahertz FOD radar consist of three parts: a reflector structure, a link, and a feed. Terahertz FOD radar relies on the reflector structure to focus and direct electromagnetic waves, and its performance is highly dependent on the surface accuracy of the reflector (i.e., the degree to which the geometry of the reflector matches the ideal parabola).

[0029] Figure 4 and 5 Mises stress and displacement simulation cloud map of a 240GHz radar under a wind load of level 10 (upward blowing). Figure 6 and 7 The simulation cloud diagrams of Mises stress and displacement for the 240GHz radar under an overall rotational speed of 6 r / min are shown. The simulation results indicate that the 240GHz radar with the radar reflection structure of this embodiment exhibits very low stress levels and maximum deformation under both level 10 wind load and an overall rotational speed of 6 r / min, meeting the stiffness and strength requirements of the structural design.

[0030] Compared with traditional metal back frame structures, this embodiment has the following significant advantages:

[0031] 1. Lightweight and high stiffness: The specific strength and specific modulus of carbon fiber composites are much higher than those of metals. Combined with the support of the foam core layer, higher overall stiffness is achieved with lighter weight, reducing the load on the servo system.

[0032] 2. Thermal stability: Both carbon fiber and the selected structural foam have lower coefficients of thermal expansion, which can be designed to be close to zero. This makes the entire frame extremely insensitive to temperature changes, fundamentally eliminating surface accuracy failures caused by thermal expansion and contraction, and ensuring the long-term focusing capability of the terahertz beam.

[0033] 3. Vibration damping performance: The foam core layer is an excellent damping material that can effectively absorb and attenuate wind vibration and mechanical vibration, suppress resonance, provide a "silent" stable platform for the reflector, and reduce phase noise.

[0034] 4. High precision and integration: By molding in a precision mold in one go, a frame body with high precision surface can be obtained, avoiding the cumulative error caused by assembling multiple parts and ensuring the final precision of the reflective surface.

[0035] 5. Design freedom and weather resistance: It can easily form complex curved structures, and the carbon fiber material itself has excellent corrosion resistance and fatigue resistance, making it suitable for long-term outdoor deployment.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A reflecting structure for terahertz FOD radar, characterized by, Comprising: a backrest and a mounting fixture; the backrest comprises a skin made of carbon fiber composite material and a foam core layer filled inside the skin, the skin comprises a back skin part and a reflecting skin part, the mounting fixture is connected to the back skin part, a reflecting profile is provided on the reflecting skin part, and a reflecting layer is provided on the reflecting profile.

2. The terahertz FOD radar reflecting structure of claim 1, wherein, The skin is formed by laminating and curing a plurality of carbon fiber layers.

3. The terahertz FOD radar reflecting structure of claim 1, wherein, The skin is integrally formed by a mold.

4. The terahertz FOD radar reflecting structure of claim 1, wherein, The mounting fixture is fixed to the back skin part by embedding a metal insert.

5. The terahertz FOD radar reflecting structure of claim 1, wherein, The foam core layer is made of high-strength closed-cell foam.

6. The terahertz FOD radar reflecting structure of claim 5, wherein, The foam core layer is made of polymethacrylimide foam.

7. A terahertz FOD radar, characterized by, Comprising the reflecting structure according to any one of claims 1-6.

8. The terahertz FOD radar of claim 7, wherein, Comprising a transmitting channel and a receiving channel; The transmitting channel comprises a first reflecting structure as a transmitting end reflecting structure, and the receiving channel comprises a second reflecting structure as a receiving end reflecting structure.

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