电推进羽流电磁效应分析
发布时间：2018-08-12 11:18
【摘要】：随着航天技术的飞速发展,电推进系统因其具有更高的工质利用率和长时间的在轨寿命等突出优点得到了广泛的研究和应用。电推进技术已经成为通信卫星工程应用中必不可少的技术手段,对我国卫星领域的能力提升具有重要研制意义。在国外,电推进技术更加成熟,且已在主流大型卫星平台上应用,有众多值得借鉴之处。我国对电推进技术的研究也一直在进步,部分卫星平台上已经得到应用。但是由于电推进器在工作时,会向外喷射高温、高能的羽流,羽流的复杂电磁环境会对航天系统产生多种危害,进而造成巨大损失。所以必须要对电推进羽流和整星的电磁兼容问题开展全面且深入的研究工作,将在轨情形可能遇到的所有未知电磁问题使用地面仿真测试手段进行有效预估,以推动电推进技术在我国卫星平台上的成功应用。电推进羽流是一种复杂的非均匀等离子体,对等离子体的物理性质描述一般包括等离子体频率,碰撞频率和入射电磁波频率,这三者互相影响,存在着强烈的非线性作用,因此决定了等离子体和电磁波之间作用方式的复杂性与多样性。在本文中,根据入射电磁波的频段范围不同,介绍了多种用于分析羽流电磁效应的数值计算方法,及适用于不同方法的羽流电子浓度建模方式。主要包括近似算法:WKB近似方法和传播矩阵法;高精度算法有:FDTD方法和射线跟踪方法。重点仿真计算了羽流对通讯电磁波的能量、相位及辐射方向特性图的影响和卫星表面上任一点敏感元器件处的接受场值大小,并和无羽流情况作对比。测试结果表明了羽流的电磁影响,这为实际在轨情形中羽流与航天系统的电磁兼容性问题提供了一定的参考价值。
[Abstract]:With the rapid development of spaceflight technology, the electric propulsion system has been widely studied and applied because of its outstanding advantages such as higher working medium utilization rate and longer in-orbit life. The electric propulsion technology has become an indispensable technical means in the application of communication satellite engineering, and has important significance for the development of the capability improvement in the field of satellite in China. In foreign countries, the electric propulsion technology is more mature, and has been used in the mainstream large satellite platform, there are many worthy of reference. The research on electric propulsion technology in China has been progressing, and some satellite platforms have been applied. However, when the electric thruster is working, it will spray high temperature, high energy plume and complex electromagnetic environment of plume, which will cause many kinds of harm to the space system and cause great losses. Therefore, it is necessary to carry out a comprehensive and in-depth study on the electromagnetic compatibility between the electropropulsion plume and the whole satellite, and to effectively predict all the unknown electromagnetic problems that may be encountered in the orbit situation by means of ground simulation tests. In order to promote the successful application of the electric propulsion technology on the satellite platform of our country. The electropropulsion plume is a kind of complex inhomogeneous plasma. The physical properties of the plasma generally include the frequency of plasma, the frequency of collision and the frequency of incident electromagnetic wave. Therefore, the complexity and diversity of the interaction between plasma and electromagnetic wave are determined. In this paper, according to the different frequency range of the incident electromagnetic wave, several numerical methods for analyzing the plume electromagnetic effect are introduced, and the modeling methods of the plume electron concentration suitable for different methods are introduced. It mainly includes the approximate algorithm: WKB approximation method and propagation matrix method, and the high precision algorithm includes the: FDTD method and ray tracing method. The effects of plume on the energy, phase and radiation direction of the electromagnetic wave are simulated and calculated, and the value of the receiving field at any sensitive component on the satellite surface is calculated and compared with that in the case of no plume. The test results show that the electromagnetic effect of plume provides a certain reference value for the problem of electromagnetic compatibility between plume and space system in the actual orbital case.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O53;TN03
[Abstract]:With the rapid development of spaceflight technology, the electric propulsion system has been widely studied and applied because of its outstanding advantages such as higher working medium utilization rate and longer in-orbit life. The electric propulsion technology has become an indispensable technical means in the application of communication satellite engineering, and has important significance for the development of the capability improvement in the field of satellite in China. In foreign countries, the electric propulsion technology is more mature, and has been used in the mainstream large satellite platform, there are many worthy of reference. The research on electric propulsion technology in China has been progressing, and some satellite platforms have been applied. However, when the electric thruster is working, it will spray high temperature, high energy plume and complex electromagnetic environment of plume, which will cause many kinds of harm to the space system and cause great losses. Therefore, it is necessary to carry out a comprehensive and in-depth study on the electromagnetic compatibility between the electropropulsion plume and the whole satellite, and to effectively predict all the unknown electromagnetic problems that may be encountered in the orbit situation by means of ground simulation tests. In order to promote the successful application of the electric propulsion technology on the satellite platform of our country. The electropropulsion plume is a kind of complex inhomogeneous plasma. The physical properties of the plasma generally include the frequency of plasma, the frequency of collision and the frequency of incident electromagnetic wave. Therefore, the complexity and diversity of the interaction between plasma and electromagnetic wave are determined. In this paper, according to the different frequency range of the incident electromagnetic wave, several numerical methods for analyzing the plume electromagnetic effect are introduced, and the modeling methods of the plume electron concentration suitable for different methods are introduced. It mainly includes the approximate algorithm: WKB approximation method and propagation matrix method, and the high precision algorithm includes the: FDTD method and ray tracing method. The effects of plume on the energy, phase and radiation direction of the electromagnetic wave are simulated and calculated, and the value of the receiving field at any sensitive component on the satellite surface is calculated and compared with that in the case of no plume. The test results show that the electromagnetic effect of plume provides a certain reference value for the problem of electromagnetic compatibility between plume and space system in the actual orbital case.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：O53;TN03
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