空中目標紅外輻射建模及成像仿真
發(fā)布時間：2019-03-07 09:12
【摘要】：溫度高于絕對零度的物體都會向外輻射出能量,空中目標在空中做高速飛行,外部條件以及內(nèi)部結構的不同都會導致空中目標蒙皮溫度場分布產(chǎn)生變化。同時當發(fā)動機處于工作狀態(tài)時,會有大量的高溫燃燒產(chǎn)物排放到大氣之中,向外進行大量的紅外輻射。這些都為空中目標的探測、追蹤以及攔截提供了依據(jù)。隨著大規(guī)模集成電路的發(fā)展,計算機計算速度大幅提高,紅外仿真技術也得到了迅速發(fā)展。利用紅外仿真技術可以逼真的對目標的紅外特性進行成像仿真,可為紅外制導武器的研制設計依據(jù)。本文對空中目標的紅外輻射特性進行了研究,主要對組成空中目標輻射源的蒙皮與尾焰在探測方向上的輻射強度進行計算,并在此基礎上進行紅外成像,最終得到空中目標的紅外仿真圖像。本文首先建立了空中目標的幾何模型,并對其進行了非結構網(wǎng)格的劃分,在綜合考慮外部大氣對目標蒙皮的氣動加熱、外部環(huán)境對目標蒙皮的投入輻射以及目標內(nèi)部各部件間的換熱的基礎上,采用有限體積法建立導熱方程,并對其進行離散求解,最終得到空中目標在飛行過程中蒙皮的非穩(wěn)態(tài)溫度場分布情況。其次,在傳統(tǒng)二流法和六流法的基礎上,對由傳統(tǒng)熱流法演變得到的源項六流法數(shù)學模型進行研究,并在已知尾焰流場的溫度、壓強以及各組分濃度分布的前提下,將尾焰包裹在一個圓柱體內(nèi),采用源項六流法對輻射傳遞方程進行求解,最終得到探測方向上的輻射強度值。最終,由計算得到的蒙皮溫度場分布,通過普朗克公式求得目標蒙皮的本征輻射強度,同時考慮太陽、天空以及地面在蒙皮上反射到探測器方向的輻射強度。在考慮蒙皮及尾焰輻射在大氣中的傳輸效應的基礎上,通過網(wǎng)格裁剪以及“深度緩存”的思想,最終得到空中目標在探測器上的紅外仿真圖像。
[Abstract]:Objects whose temperature is higher than absolute zero will radiate energy out of the air. The different external conditions and internal structure will result in the change of the temperature field distribution of the skin of the aerial target due to the high-speed flight of the aerial target in the air. At the same time, when the engine is in operation, a large number of high-temperature combustion products will be emitted into the atmosphere, and a large amount of infrared radiation will be carried out outward. All of these provide a basis for the detection, tracking and interception of aerial targets. With the development of large scale integrated circuits (LSI), the computer computing speed has been greatly increased, and infrared simulation technology has also been developed rapidly. Infrared simulation technology can be used to simulate the infrared characteristics of target realistically, which can be used as the basis for the development and design of infrared guided weapons. In this paper, the infrared radiation characteristics of aerial targets are studied. The radiation intensity of the skin and the plume of the aerial target radiation source is calculated in the direction of detection, and the infrared imaging is carried out on this basis. Finally, infrared simulation images of aerial targets are obtained. In this paper, the geometric model of the aerial target is first established, and the unstructured mesh is divided into two parts, and the aerodynamic heating of the target skin by the external atmosphere is considered comprehensively. On the basis of the input radiation of the external environment to the target skin and the heat transfer between the components inside the target, the heat conduction equation is established by the finite volume method, and the heat conduction equation is solved by discrete method. Finally, the unsteady temperature distribution of the skin during the flight process of the aerial target is obtained. Secondly, on the basis of the traditional two-flow method and the six-flow method, the mathematical model of the source-term six-flow method derived from the traditional heat flow method is studied, and on the premise of known temperature, pressure and concentration distribution of each component in the wake flow field, The tail flame is wrapped in a cylinder and the radiative transfer equation is solved by the source term six-current method. Finally, the radiation intensity in the direction of detection is obtained. Finally, based on the calculated temperature distribution of the skin, the intrinsic radiation intensity of the target skin is obtained by Planck formula, and the radiation intensity of the sun, the sky and the ground reflected from the skin to the direction of the detector is also taken into account. On the basis of considering the propagation effect of the skin and flame radiation in the atmosphere, the infrared simulation image of the aerial target on the detector is obtained through the idea of mesh clipping and "depth buffer".
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TJ01;TN219
本文編號：2435978
[Abstract]:Objects whose temperature is higher than absolute zero will radiate energy out of the air. The different external conditions and internal structure will result in the change of the temperature field distribution of the skin of the aerial target due to the high-speed flight of the aerial target in the air. At the same time, when the engine is in operation, a large number of high-temperature combustion products will be emitted into the atmosphere, and a large amount of infrared radiation will be carried out outward. All of these provide a basis for the detection, tracking and interception of aerial targets. With the development of large scale integrated circuits (LSI), the computer computing speed has been greatly increased, and infrared simulation technology has also been developed rapidly. Infrared simulation technology can be used to simulate the infrared characteristics of target realistically, which can be used as the basis for the development and design of infrared guided weapons. In this paper, the infrared radiation characteristics of aerial targets are studied. The radiation intensity of the skin and the plume of the aerial target radiation source is calculated in the direction of detection, and the infrared imaging is carried out on this basis. Finally, infrared simulation images of aerial targets are obtained. In this paper, the geometric model of the aerial target is first established, and the unstructured mesh is divided into two parts, and the aerodynamic heating of the target skin by the external atmosphere is considered comprehensively. On the basis of the input radiation of the external environment to the target skin and the heat transfer between the components inside the target, the heat conduction equation is established by the finite volume method, and the heat conduction equation is solved by discrete method. Finally, the unsteady temperature distribution of the skin during the flight process of the aerial target is obtained. Secondly, on the basis of the traditional two-flow method and the six-flow method, the mathematical model of the source-term six-flow method derived from the traditional heat flow method is studied, and on the premise of known temperature, pressure and concentration distribution of each component in the wake flow field, The tail flame is wrapped in a cylinder and the radiative transfer equation is solved by the source term six-current method. Finally, the radiation intensity in the direction of detection is obtained. Finally, based on the calculated temperature distribution of the skin, the intrinsic radiation intensity of the target skin is obtained by Planck formula, and the radiation intensity of the sun, the sky and the ground reflected from the skin to the direction of the detector is also taken into account. On the basis of considering the propagation effect of the skin and flame radiation in the atmosphere, the infrared simulation image of the aerial target on the detector is obtained through the idea of mesh clipping and "depth buffer".
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TJ01;TN219
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相關期刊論文 前3條
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，本文編號：2435978
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