基于三维仿真模拟的电磁屏蔽服装屏蔽效能分布研究

发布时间：2019-06-24 20:06

【摘要】：随着科学技术的快速发展,各种电子设备在给人们的生活带来便利的同时,电磁辐射也在时刻威胁着人们的健康。为了有效地保护人体健康,免受电磁辐射的影响,电磁屏蔽服装开始进入人们的视野,成为电磁防护用品研究的热点。但是服装为了满足服用性,在制作的过程中会出现一些孔或缝,这在一定程度上影响了电磁屏蔽服装整体的屏蔽效能,并且电磁屏蔽服装屏蔽效能测试因受到实验场地和设备的限制,只能测得电磁屏蔽服装在一定频率范围内的屏蔽效能,不能覆盖所有情况。因此,本文借助电磁仿真软件对带孔、缝的电磁屏蔽服装屏蔽效能进行仿真模拟,以期得到在更宽的频率范围内孔的大小、个数和间距以及缝的宽度对电磁屏蔽服装屏蔽效能的影响规律。本文首先建立了女性人体模型,其次采用反演法根据电磁屏蔽基本理论以及建立的人体模型在电磁仿真软件CST中进行仿真实验的分析验证,证明了本文所用仿真方法的准确度。然后建立带孔缝电磁屏蔽服装在电磁辐射下的仿真模型,计算出带有不同孔、缝的电磁屏蔽服装的屏蔽效能,最后对仿真的结果进行分析,得出不同孔、缝对电磁屏蔽服装屏蔽效能的影响规律。仿真结果表明,电磁屏蔽服装上孔的大小、间距和位置以及缝隙的宽窄对其屏蔽效能有一定的影响,当两个长方形纽扣孔的面积相差在10mm2以内时,长宽比小的长方形孔洞对服装屏蔽效能的影响更小。纽扣孔的间距在10mm以内时会明显影响服装整体的屏蔽效能,超过20mm时,服装整体的屏蔽效能降低,但是纽扣孔的间距则不再影响服装的屏蔽效能。纽扣孔的个数增加时,电磁屏蔽服装的屏蔽效能会相应降低。但是,当孔的个数为2—4个时,电磁屏蔽服装的屏蔽效能因纽扣孔个数的变化不太明显。缝隙长度一定,宽度变大时,服装的屏蔽效能随之降低,缝隙宽度在1mm以内时,缝隙的宽窄对服装整体的屏蔽效能影响不大,缝隙宽度在1mm—2mm之间时,服装整体的屏蔽效能降低,但服装屏蔽效能因缝隙宽度的变化不太明显。缝隙宽度超过2mm以后,屏蔽效能又开始显著降低。因此,在设计电磁屏蔽服装时,掌握孔洞大小、个数和间距以及缝隙的宽度对电磁屏蔽服装屏蔽效能的有效影响区间,通过控制纽扣孔的长宽比,间距,个数以及缝隙的宽度可以更加灵活合理的设计电磁屏蔽服装的结构。
[Abstract]:With the rapid development of science and technology, all kinds of electronic equipment not only bring convenience to people's life, but also threaten people's health at all times. In order to effectively protect human health from the influence of electromagnetic radiation, electromagnetic shielding clothing began to enter people's field of vision, and has become a hot spot in the research of electromagnetic protective equipment. However, in order to meet the serviceability, there will be some holes or seams in the process of manufacture, which affects the overall shielding effectiveness of electromagnetic shielding clothing to a certain extent, and the electromagnetic shielding clothing shielding effectiveness test can only be measured in a certain frequency range because of the limitations of the experimental site and equipment, and can not cover all the cases. Therefore, in this paper, the shielding effectiveness of electromagnetic shielding clothing with holes and seams is simulated by means of electromagnetic simulation software, in order to obtain the influence of the size, number and spacing of holes and the width of seams on the shielding effectiveness of electromagnetic shielding clothing in a wider frequency range. In this paper, the female mannequin model is established firstly, and then the simulation experiment is carried out in the electromagnetic simulation software CST by using the inversion method according to the basic theory of electromagnetic shielding and the established mannequin, which proves the accuracy of the simulation method used in this paper. Then the simulation model of electromagnetic shielding clothing with holes and seams is established, and the shielding effectiveness of electromagnetic shielding clothing with different holes and seams is calculated. Finally, the simulation results are analyzed, and the influence of different holes and seams on the shielding effectiveness of electromagnetic shielding clothing is obtained. The simulation results show that the size, spacing and position of the holes and the width and narrowing of the gap have a certain influence on the shielding effectiveness of the electromagnetic shielding garment. When the area difference of the two rectangular button holes is within 10mm2, the rectangular holes with small aspect ratio have less influence on the shielding effectiveness of the clothing. When the distance between button holes is within 10mm, the shielding effectiveness of clothing will be obviously affected. When the distance between button holes is higher than 20mm, the shielding effectiveness of clothing will be reduced, but the spacing of button holes will no longer affect the shielding effectiveness of clothing. When the number of button holes increases, the shielding effectiveness of electromagnetic shielding clothing will be reduced accordingly. However, when the number of holes is 2 鈮，

本文编号：2505331