【摘要】：溫度場(chǎng)仿真技術(shù)是紅外圖像仿真的基礎(chǔ),涉及傳熱學(xué)、物理學(xué)和空氣動(dòng)力學(xué)多門(mén)學(xué)科,溫度場(chǎng)計(jì)算的準(zhǔn)確性直接決定了紅外圖像仿真的可靠性和真實(shí)性,進(jìn)而影響紅外圖像的應(yīng)用。通過(guò)研究天空目標(biāo)溫度場(chǎng)的分布特性,綜合考慮各種影響溫度場(chǎng)的影響因子,能夠更為準(zhǔn)確的模擬出天空目標(biāo)的溫度場(chǎng),從而大幅度降低了實(shí)際測(cè)量溫度場(chǎng)的成本,加快實(shí)驗(yàn)的進(jìn)度,提高工作效率。論文的主要工作包括:溫度場(chǎng)仿真技術(shù)的國(guó)內(nèi)外研究現(xiàn)狀綜述與分析,在此基礎(chǔ)上提出了一種溫度場(chǎng)的仿真系統(tǒng)框架并給出其實(shí)現(xiàn)。仿真系統(tǒng)的實(shí)現(xiàn)包括以下幾個(gè)方面:天空目標(biāo)建模、3DS文件讀取、一般運(yùn)動(dòng)狀態(tài)下飛行器溫度場(chǎng)計(jì)算以及快速運(yùn)動(dòng)狀態(tài)下飛行器溫度場(chǎng)計(jì)算。具體來(lái)講,論文首先介紹了天空目標(biāo)的建模過(guò)程及網(wǎng)格劃分;然后利用3DS文件作為系統(tǒng)的模型輸入,通過(guò)研究3DS文件的塊結(jié)構(gòu),介紹了模型的讀取方法及流程;接著針對(duì)天空目標(biāo)的受熱特性,詳細(xì)分析了影響天空目標(biāo)溫度場(chǎng)分布的主要因素:外部氣體對(duì)蒙皮的氣動(dòng)加熱、外部氣體與蒙皮的對(duì)流換熱、太陽(yáng)對(duì)蒙皮的熱輻射、飛行器的內(nèi)熱源工作產(chǎn)生的熱輻射、飛行器內(nèi)部電子設(shè)備的熱輻射以及內(nèi)部氣體與蒙皮的對(duì)流換熱等。由于這些因素對(duì)天空目標(biāo)不同部位的影響差異,因此在計(jì)算溫度場(chǎng)時(shí)將天空目標(biāo)分為不同模塊進(jìn)行計(jì)算。其中一般運(yùn)動(dòng)狀態(tài)下天空目標(biāo)分為:除去內(nèi)熱源后目標(biāo)和目標(biāo)內(nèi)熱源�？焖龠\(yùn)動(dòng)狀態(tài)下天空目標(biāo)分為:目標(biāo)頭部、目標(biāo)體與目標(biāo)內(nèi)熱源。最后,通過(guò)在不同參數(shù)下模擬天空目標(biāo)的狀態(tài)變化,仿真出天空目標(biāo)溫度場(chǎng)的分布情況,并將實(shí)驗(yàn)結(jié)果與理論結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證了本文所提方法的有效性。
[Abstract]:Temperature field simulation technology is the foundation of infrared image simulation. It involves many subjects such as heat transfer, physics and aerodynamics. The accuracy of temperature field calculation directly determines the reliability and authenticity of infrared image simulation. Then the application of infrared image is affected. By studying the distribution characteristics of the temperature field of the sky target and synthetically considering the influence factors of the temperature field, the temperature field of the sky target can be more accurately simulated, thus greatly reducing the cost of the actual measurement of the temperature field. Speed up the progress of the experiment and improve the working efficiency. The main work of this paper is as follows: the research status of temperature field simulation technology at home and abroad is summarized and analyzed. Based on this, a simulation system framework of temperature field is proposed and its realization is given. The implementation of the simulation system includes the following aspects: the sky target modeling, the reading of 3DS files, the calculation of the temperature field of the aircraft in general motion state and the calculation of the temperature field in the fast moving state. Specifically, the paper firstly introduces the modeling process and grid division of sky target, then uses 3DS file as the model input of the system, and introduces the reading method and flow of the model by studying the block structure of the 3DS file. Then, the main factors influencing the temperature field distribution of sky target are analyzed in detail: the aerodynamic heating of the outer gas to the skin, the convection heat transfer between the outer gas and the skin, and the thermal radiation of the sun to the skin. The thermal radiation from the internal heat source of the aircraft, the thermal radiation from the electronic equipment inside the aircraft, and the convection heat transfer between the inner gas and the skin, etc. Because of the difference of these factors on different parts of the sky target, the sky target is divided into different modules to calculate the temperature field. The sky target in general moving state can be divided into two parts: the target after removing the internal heat source and the target internal heat source. The sky target in the fast moving state can be divided into the target head, the target body and the internal heat source of the target. Finally, the distribution of the temperature field of the sky target is simulated by simulating the state change of the sky target under different parameters, and the experimental results are compared with the theoretical results to verify the effectiveness of the proposed method.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN219

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本文編號(hào)：2288944