天空目标温度场仿真研究
发布时间：2018-10-23 10:20
【摘要】：温度场仿真技术是红外图像仿真的基础,涉及传热学、物理学和空气动力学多门学科,温度场计算的准确性直接决定了红外图像仿真的可靠性和真实性,进而影响红外图像的应用。通过研究天空目标温度场的分布特性,综合考虑各种影响温度场的影响因子,能够更为准确的模拟出天空目标的温度场,从而大幅度降低了实际测量温度场的成本,加快实验的进度,提高工作效率。论文的主要工作包括:温度场仿真技术的国内外研究现状综述与分析,在此基础上提出了一种温度场的仿真系统框架并给出其实现。仿真系统的实现包括以下几个方面:天空目标建模、3DS文件读取、一般运动状态下飞行器温度场计算以及快速运动状态下飞行器温度场计算。具体来讲,论文首先介绍了天空目标的建模过程及网格划分;然后利用3DS文件作为系统的模型输入,通过研究3DS文件的块结构,介绍了模型的读取方法及流程;接着针对天空目标的受热特性,详细分析了影响天空目标温度场分布的主要因素:外部气体对蒙皮的气动加热、外部气体与蒙皮的对流换热、太阳对蒙皮的热辐射、飞行器的内热源工作产生的热辐射、飞行器内部电子设备的热辐射以及内部气体与蒙皮的对流换热等。由于这些因素对天空目标不同部位的影响差异,因此在计算温度场时将天空目标分为不同模块进行计算。其中一般运动状态下天空目标分为:除去内热源后目标和目标内热源。快速运动状态下天空目标分为:目标头部、目标体与目标内热源。最后,通过在不同参数下模拟天空目标的状态变化,仿真出天空目标温度场的分布情况,并将实验结果与理论结果进行对比分析,验证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.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN219
[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.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN219
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