Parameters of cloud to cloud and intra-cloud lightning strikes to CFC and metallic aircraft structures

J. Fisher, P. Hoole, K. Pirapaharan, S. Hoole
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引用次数: 3

Abstract

This paper presents for the first time an assessment of the impact of direct cloud-to-cloud (CC) and intra-cloud (IC) lightning flash on a commercial and a military aircraft. In contrast to cloud-to-ground (CG) lightning strikes to aircraft, where measurements of CG flash measurements may be extended to aircraft strikes, CC and IC flashes are not so accessible. The effects of CC and IC flashes differ from CG flash largely owing to the earth resistance present in CG flashes which imposes limits on the lightning return stroke. It applies the experimentally-attested transmission line model which was reviewed in a previous companion paper to assess the impact on metallic and carbon fiber composite (CFC) structures of modern aircraft. It compares the electrical impact of CC lightning flash on aircraft made of CFC and metallic structures. The simulations and analysis of voltages and the first return stroke current waveforms demonstrate the important distinctions in the characteristics of direct CC lightning effects on metallic and non-metallic airframes. Among the significant results observed are large differences in current time derivatives on the surface of the carbon fiber composites and metallic airframes. Further observations show that there are rise times for the voltage and currents which fall within the subnano and submicro seconds yielding large time derivatives for both the voltages and the currents. This can have important implications for the shielding and protection of the aircraft electrical and electronics systems.
云对云和云内雷击对CFC和金属飞机结构的参数
本文首次对直接云对云(CC)和云内(IC)闪电对商用和军用飞机的影响进行了评估。与云对地(CG)雷击到飞机相比,CG闪光测量可以扩展到飞机撞击,CC和IC闪光不那么容易获得。连击和集成电路闪光的效果不同于连击闪光,主要是由于连击闪光中存在地电阻,地电阻对雷击回击有限制。它应用在之前的伴随论文中审查的实验证明的传输线模型来评估对现代飞机的金属和碳纤维复合材料(CFC)结构的影响。比较了氯氟烃和金属结构对飞机的电学影响。通过对电压和首回行程电流波形的仿真分析,揭示了金属和非金属机体上直接CC雷电效应特性的重要区别。在观察到的重要结果中,碳纤维复合材料表面和金属机身表面的电流导数有很大差异。进一步的观察表明,电压和电流的上升时间落在亚纳米和亚微秒内,从而产生电压和电流的大时间导数。这对飞机电气和电子系统的屏蔽和保护具有重要意义。
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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