【摘要】：預(yù)警機(jī)(AWACS)是一種集指揮和預(yù)警于一體的飛機(jī),是現(xiàn)代空戰(zhàn)的空中指揮中心,預(yù)警機(jī)的重要性日益彰顯,對(duì)其進(jìn)行有效的探測(cè)和打擊對(duì)空戰(zhàn)的勝利至關(guān)重要。近年來,隨著隱身材料的廣泛應(yīng)用,雷達(dá)探測(cè)技術(shù)的發(fā)展遇到了瓶頸,與此形成對(duì)比的是,這類目標(biāo)運(yùn)動(dòng)速度高、紅外輻射強(qiáng)烈,有利于通過紅外技術(shù)達(dá)到識(shí)別和探測(cè)的目的。預(yù)警機(jī)蒙皮紅外輻射特征明顯,有利于進(jìn)行紅外探測(cè)和成像,進(jìn)而實(shí)現(xiàn)對(duì)預(yù)警機(jī)的探測(cè)和打擊,具有重要的研究意義。本文分析了空間大氣環(huán)境的特點(diǎn),提出了大氣透過率計(jì)算模型,分析了斜程探測(cè)下的短、中、長波紅外的大氣平均透過率。重點(diǎn)對(duì)預(yù)警機(jī)進(jìn)行實(shí)體建模,并根據(jù)真實(shí)飛行環(huán)境進(jìn)行了CFD仿真,利用仿真數(shù)據(jù)和相關(guān)算法對(duì)蒙皮進(jìn)行紅外輻射特征計(jì)算分析。在對(duì)蒙皮進(jìn)行紅外特性分析的基礎(chǔ)上,利用空間坐標(biāo)變換和投影映射的方法,仿真得到機(jī)身蒙皮的紅外圖像。最后,對(duì)運(yùn)動(dòng)中的探測(cè)器整流罩進(jìn)行氣動(dòng)熱仿真分析,研究了整流罩氣動(dòng)熱對(duì)紅外成像和探測(cè)的影響,提出整流罩溫度控制指標(biāo)。本文主要分為四個(gè)部分進(jìn)行介紹:1.以紅外輻射基本理論為基礎(chǔ),先介紹了空間大氣的分子密度、溫度和壓強(qiáng)等參數(shù),并由此提出紅外波段大氣平均透過率的計(jì)算步驟,根據(jù)預(yù)警機(jī)的飛行特點(diǎn),計(jì)算了不同探測(cè)行程下的大氣平均透過率,為對(duì)預(yù)警機(jī)進(jìn)行紅外輻射特性分析和紅外圖像仿真提供了重要參數(shù)。2.針對(duì)預(yù)警機(jī)的紅外特性,對(duì)預(yù)警機(jī)蒙皮的紅外輻射特征進(jìn)行分析,利用SolidWorks軟件對(duì)預(yù)警機(jī)建立實(shí)體模型,然后用ICEM-CFD軟件建立仿真模型并完成網(wǎng)格劃分,用Fluent軟件對(duì)預(yù)警機(jī)進(jìn)行CFD仿真,考慮太陽輻射原因得到蒙皮溫度分布情況,結(jié)合遮擋和消隱相關(guān)算法,計(jì)算出不同探測(cè)方位和探測(cè)角度下預(yù)警機(jī)蒙皮的紅外輻射特征,并將分析結(jié)果與相關(guān)數(shù)據(jù)進(jìn)行對(duì)比。3.根據(jù)對(duì)預(yù)警機(jī)蒙皮紅外特征仿真分析的數(shù)據(jù),建立紅外成像仿真系統(tǒng)模型,利用空間坐標(biāo)變換和投影映射的方法,并考慮到目標(biāo)背景和噪聲的影響,對(duì)預(yù)警機(jī)蒙皮的紅外成像技術(shù)進(jìn)行仿真分析。4.最后,將探測(cè)器整流罩氣動(dòng)熱看作是環(huán)境背景熱噪聲,對(duì)不同運(yùn)動(dòng)速度下的整流罩進(jìn)行建模仿真和氣動(dòng)熱分析,研究整流罩氣動(dòng)發(fā)熱對(duì)紅外成像結(jié)果的影響,并根據(jù)紅外探測(cè)系統(tǒng)的信噪比,提出探測(cè)器整流罩溫度控制相關(guān)指標(biāo)。
[Abstract]:Early warning aircraft (AWACS) is a kind of aircraft which integrates command and warning and is the air command center of modern air combat. The importance of AWACS is becoming more and more obvious. It is very important to detect and strike AWACS effectively to the victory of air combat. In recent years, with the wide application of stealth materials, the development of radar detection technology has encountered a bottleneck. By contrast, this kind of target has high speed and strong infrared radiation, which is conducive to the purpose of identification and detection through infrared technology. The characteristics of infrared radiation on the skin of AWACS are obvious, which is conducive to infrared detection and imaging, and then to achieve the detection and strike of AWACS, which has an important research significance. In this paper, the characteristics of the space atmospheric environment are analyzed, and a model for calculating atmospheric transmittance is proposed. The atmospheric average transmittance of short, medium and long wave infrared is analyzed under oblique range detection. The solid modeling of the AWACS is emphasized, and CFD simulation is carried out according to the real flight environment. The infrared radiation characteristics of the skin are calculated and analyzed by using the simulation data and related algorithms. Based on the analysis of the infrared characteristics of the skin, the infrared image of the skin of the fuselage is obtained by using the method of space coordinate transformation and projection mapping. Finally, the aerodynamic thermal simulation of the detector fairing in motion is carried out, and the influence of the aerodynamic heat of the fairing on the infrared imaging and detection is studied, and the temperature control index of the fairing is proposed. This article is divided into four parts to introduce. Based on the basic theory of infrared radiation, the molecular density, temperature and pressure of the space atmosphere are introduced, and the calculation steps of the average atmospheric transmittance in the infrared band are put forward according to the flight characteristics of the AWACS. The average atmospheric transmittance under different detection stroke is calculated, which provides an important parameter .2. for infrared radiation characteristic analysis and infrared image simulation of AWACS. According to the infrared characteristic of the AWACS, the infrared radiation characteristics of the skin of the AWACS are analyzed. The solid model of the AWACS is established by SolidWorks, and then the simulation model is established by ICEM-CFD software and the mesh division is completed. The CFD simulation of the AWACS was carried out by fluent software. The temperature distribution of the skin was obtained by considering the reason of solar radiation. The infrared radiation characteristics of the skin of the AWACS were calculated under different detection azimuth and detection angle by combining the occlusion and blanking correlation algorithms. The results of the analysis are compared with the related data. According to the data of infrared feature simulation analysis of the skin of AWACS, the infrared imaging simulation system model is established. The method of space coordinate transformation and projection mapping is used, and the influence of target background and noise is considered. The infrared imaging technology of the skin of AWACS is simulated and analyzed. 4. Finally, the aerodynamic heat of the detector fairing is regarded as the ambient background thermal noise, and the aerodynamic thermal analysis and modeling of the fairing at different moving speeds are carried out to study the influence of the aerodynamic heating of the fairing on the infrared imaging results. According to the signal-to-noise ratio of the infrared detection system, the temperature control index of the detector fairing is put forward.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：E926.37

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