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进行飞机防雷设计的第一步即为确定飞机的雷击附着位置。提出了一种基于分形先导发展模型的直升机初始雷击附着位置数值分析方法。首先对先导发展模型进行了描述,分析了雷电下行先导电荷分布及发展规则、迎面先导起始判据及发展规律、最终击穿条件等;并根据分形理论,采用电介质击穿模型中的概率发展方式来决定下行先导的发展方向。然后,根据标准SAE-ARP 5416A中规定的相关试验方法对仿真环境中各项参数的选择进行了讨论,包括极板尺寸、直升机与极板之间的距离等。最后,利用所提出的方法对UH-60“黑鹰”进行仿真,得到了其初始雷击附着位置。
The first step in aircraft lightning protection design is to determine the location of aircraft lightning strike attachment. A numerical analysis method of helicopter initial lightning attachment position based on the fractal pilot development model is proposed. Firstly, the model of pilot development is described. The distribution and development rules of pilot charge, the initiation criterion and development rules of the pilot, the final breakdown condition and so on are analyzed. Based on the fractal theory, the probability distribution of the dielectric breakdown model Way to determine the direction of development of the downward leader. The choice of parameters in the simulation environment is then discussed according to the relevant test methods specified in the standard SAE-ARP 5416A, including the plate size, the distance between the helicopter and the plate, and so on. Finally, the proposed method is used to simulate the UH-60 Black Hawk, and the initial location of the lightning strike is obtained.