Simulation of Aircraft Electromagnetic Environment to Compute EMC Test Conditions

Nehal Akram, Nimra Arshad, I. Majid
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引用次数: 1

Abstract

EMI issues are a stark reality confronting avionics equipment. In an aircraft not only a number of electronic systems operate in a confined space but also the external Electromagnetic Environment (EME) has become very harsh, due to presence of high power transmitters and more significantly lightning associated EM fields. Thus EMC testing of aircraft is a complex and costly undertaking where during testing High Intensity Radiated Fields (HIRF) of magnitudes comparable to actual conditions has to be generated. In recent past an innovative approach has been formulated to make this testing easier to perform, namely Low Level Coupling (LLC) tests. Where transfer functions are computed through simulations that can predict the resultant surface currents and EM fields on & inside the fuselage, which grossly lowers test level magnitudes. Therefore, the testing can be done at much lower levels. However, a calculation of these transfer functions requires intricate 3DEM simulations and is time extensive. So far the transfer functions computed by aviation regulatory authorities are generic in nature. This paper elaborates computation of more specific transfer functions, taking into account the effect of additional factors like apertures and orientation of wires, whereas the original transfer function is dependent on fuselage length only. Results are computed through 3D EM simulations and presented and analyzed.
飞机电磁环境仿真计算电磁兼容测试条件
电磁干扰问题是航空电子设备面临的严峻现实。在飞机上,不仅许多电子系统在密闭空间中运行,而且由于存在高功率发射机和更明显的闪电相关电磁场,外部电磁环境(EME)也变得非常恶劣。因此,飞机的电磁兼容测试是一项复杂而昂贵的工作,在测试过程中必须产生与实际条件相当的高强度辐射场(HIRF)。在最近的过去,一种创新的方法已经制定,使这种测试更容易执行,即低水平耦合(LLC)测试。通过模拟计算传递函数,可以预测机身内外产生的表面电流和电磁场,这大大降低了测试水平的幅度。因此,可以在更低的级别上进行测试。然而,这些传递函数的计算需要复杂的3DEM模拟,并且时间很长。到目前为止,航空监管部门计算的传递函数本质上是通用的。本文阐述了更具体的传递函数的计算,考虑了其他因素的影响,如孔径和导线的方向,而不是原来的传递函数只依赖于机身长度。通过三维电磁仿真对结果进行了计算和分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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