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Cavity structure using wave-absorbing material

A wave-absorbing material and cavity technology, which is applied in the field of aircraft stealth, can solve the problems of high cost of high-performance wave-absorbing materials, and achieve the effects of improving wave-absorbing performance, avoiding use, and effectively controlling

Active Publication Date: 2020-04-14
BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the deficiencies in the application schemes of the existing aircraft cavity structure absorbing materials and the high cost of using broadband high-performance absorbing materials, the present invention proposes a cavity structure using absorbing materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The first step: cavity structure model selection and model processing

[0049] According to the model or project requirements, select a specific aircraft inlet, mesh the inner surface, and use it to calculate the reflection angle: firstly, extract the equal-section data points of the inlet, starting from the inlet of the inlet, and then Take equidistant cross-section points of the inlet duct at intervals of 100 mm to obtain a certain number of cross-sections, select 100 data points for each cross-section, and then use the selected data points to form triangular surface elements to establish a calculation model. Process the inlet model, extract the inner surface of the model and design a surface field recorder for surface field strength simulation and analysis.

[0050] Step 2: Analysis and Statistics of Electromagnetic Wave Reflection Angle

[0051] The calculation parameters for the analysis and statistics of electromagnetic wave reflection angle include incident azim...

Embodiment 2

[0061] Step 1: Aircraft cavity structure model selection and model processing

[0062] Select a typical square air inlet, and divide the inner surface into a grid for calculating the reflection angle: firstly, the data points of the equal section of the air inlet are extracted, starting from the inlet of the air inlet, the air inlet is measured at intervals of 10mm Take equidistant cross-section points to obtain a certain number of cross-sections, select 20 data points for each cross-section, and then use the selected data points to form triangular surface elements to establish a calculation model. Process the inlet model, extract the inner surface of the model and design a surface field recorder for surface field strength simulation and analysis.

[0063] Step 2: Analysis and Statistics of Electromagnetic Wave Reflection Angle

[0064] The calculation parameters of electromagnetic wave reflection angle analysis and statistics include incident azimuth angle 0°~80°, azimuth an...

Embodiment 3

[0074] The first step: cavity structure model selection and model processing

[0075] According to the model or project requirements, select a specific aircraft exhaust pipe, mesh the inner surface, and use it to calculate the reflection angle: firstly, the exhaust pipe is extracted with equal cross-section data points, starting from the outlet of the exhaust system, and then Take equidistant cross-section points of the exhaust pipe at intervals of 100 mm to obtain a certain number of cross-sections, select 100 data points for each cross-section, and then use the selected data points to form triangular surface elements to establish a calculation model. Process the inlet model, extract the inner surface of the model and design a surface field recorder for surface field strength simulation and analysis.

[0076] Step 2: Analysis and Statistics of Electromagnetic Wave Reflection Angle

[0077] The calculation parameters for the analysis and statistics of electromagnetic wave ref...

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Abstract

The invention belongs to the technical field of air vehicle stealth, and particularly relates to a cavity structure using a wave-absorbing material. The cavity structure uses metal or a carbon fiber composite as a base, different positions of the interior of a cavity of the cavity structure are coated with different thicknesses or different types of wave-absorbing materials, through the wave-absorbing material application scheme designed through the design method, the wave-absorbing performance of a wave-absorbing material used for an air inlet channel can be effectively improved, and the potential of existing materials is achieved better; and the using zone of the wave-absorbing material is reduced, using of wide-frequency-band wave-absorbing materials is reduced, accordingly, the cost and difficulty of the wave-absorbing material scheme are decreased, and air inlet channel forward radar stealth is achieved with high efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of aircraft stealth, and in particular relates to a cavity structure of a wave-absorbing material flying chess based on the application of electromagnetic scattering characteristics. Background technique [0002] The cavity structure represented by the air inlet is one of the main forward radar scattering sources of the aircraft. Applying high-performance absorbing materials on the air inlet lip and channel is an important way to reduce the radar scattering of the air inlet. Includes suppression of lip radar returns and multiple bounce radar returns from the intake channel. [0003] At present, the technical scheme of spraying radar absorbing material on the surface of the lip of the air inlet and the inner surface of the air inlet channel has the following deficiencies: [0004] (1) At present, the absorbing performance of absorbing materials is mainly designed for the vertical incidence direction of elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02C7/04B64D33/02
CPCB64D33/02F02C7/04
Inventor 刘晓菲郭晓铛其他发明人请求不公开姓名
Owner BEIJING RES INST OF MECHANICAL & ELECTRICAL TECH
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