人体电磁防护服的仿真分析

发布时间：2018-01-20 09:32

本文关键词： 微波防护服防护效能时域有限差分方法比吸收率孔缝解剖学人体模型　出处：《华东师范大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着经济社会的快速发展和电磁技术的进步,电磁设施和设备的应用日益广泛,环境电磁辐射水平也随之增强,因电磁暴露带来的健康问题受到人们的严重关注。我国相关法规规定,环境电磁辐照水平超出10 w/m2时必须采取适当的防护措施。除了对电磁辐照源进行严格管控外,电磁防护服的穿戴是目前对人员的防护中使用较为广泛的被动措施之一。在电磁防护服的设计和制造中,从防护服孔、缝进入人体的电磁能量是需要考虑的重要问题,也是决定电磁防护服防护效能的关键因素。现有的电磁防护服实验和理论研究主要把关注的重点放在防护服面料的电磁屏蔽性能上,较少考虑防护服开口设计的影响,将防护服和人体作为统一系统的研究也很欠缺。为此,本文在真实人体解剖学模型的基础上,运用时域有限差分法计算了良导体防护服在0.3-3 GHz频段内,平面波从不同方向以各种极化方式辐照下,着装状态人体的电磁吸收及防护服开口大小对其电磁防护性能的影响。我们通过计算穿着防护服前后,人体模型内电磁能量吸收的变化,主要得到如下规律(1)良导体防护服上所开的孔缝是其电磁泄露的主要原因,当缝隙与电磁波的电场极化方向垂直时,电磁波的能量更容易发生泄漏;(2)当电磁波频率在0.3 GHz到3 GHz之间时,相同开口设计的良导体防护服的防护效能随频率的增高而增强,并趋于稳定;(3)对孔缝不进行处理的防护服一般难以达到30 dB以上的防护效果。我们提出了一种抑制孔缝电磁泄漏的新方法,仿真分析表明,能很好地抑制防护服孔缝电磁泄漏,可有效提升防护服的防护性能。本文的研究为防护服的设计提供了技术支撑。
[Abstract]:With the rapid development of economy and society and the progress of electromagnetic technology, the application of electromagnetic facilities and equipment is increasingly widespread, and the level of environmental electromagnetic radiation is also enhanced. Due to electromagnetic exposure to health problems caused by people's serious concern. China's relevant laws and regulations. Appropriate protective measures must be taken when the ambient electromagnetic radiation level exceeds 10 w/ m ~ 2. In addition to strict control of electromagnetic radiation sources. The wear of electromagnetic protective clothing is one of the more widely used passive measures in the protection of personnel. In the design and manufacture of electromagnetic protective clothing, the hole of protective clothing is used. The electromagnetic energy that seams into the human body is an important issue to be considered. It is also a key factor to determine the effectiveness of electromagnetic protective clothing. The existing electromagnetic protective clothing experiments and theoretical research mainly focus on the electromagnetic shielding performance of protective clothing fabric. Less consideration is given to the influence of the design of the opening of protective clothing, and the study of the uniform system of protective clothing and human body is also lacking. Therefore, this paper is based on the real anatomy model of human body. The finite difference time-domain (FDTD) method is used to calculate the radiation of plane wave in the range of 0.3-3 GHz under various polarization modes. The effect of the electromagnetic absorption and the size of the opening of the protective clothing on the electromagnetic protection performance. We calculate the changes of the electromagnetic energy absorption in the human body model before and after wearing the protective clothing. The main results are as follows: 1) the main reason of electromagnetic leakage is the opening of holes in good conductor protective clothing. When the gap is perpendicular to the polarization direction of the electric field of the electromagnetic wave, the energy of the electromagnetic wave is more likely to leak; (2) when the frequency of electromagnetic wave is between 0.3 GHz and 3 GHz, the protective efficiency of the good conductor protective clothing designed with the same opening increases with the increase of frequency and tends to be stable; 3) the protective clothing without the treatment of hole seam is difficult to achieve more than 30dB protective effect. We propose a new method to restrain the electromagnetic leakage of the hole seam, and the simulation results show that the method is more than 30 dB. This paper provides technical support for the design of protective clothing.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS941.731.7

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