飞机/发动机复杂腔体遮挡算法研究

利用电磁场高频近似理论，计算飞机进气道、喷管和座舱等腔体的RCS，需要考虑腔体内表面网格单元感应电流之间的相互影响，即判断网格单元之间的相互遮挡关系。在分析比较直接搜索及改进算法、并行＋直接搜索算法和拓扑法的基础上，提出了快速判断复杂腔体面网格单元相互可见性的新算法一拓扑踪迹算法。计算分析表明，文中算法不仅适用于任意复杂电大腔体遮挡关系判断，计算速度比其他三种算法提高若干倍，且构建腔体的体网格越大计算速度越快。

An Occlusion Algorithm for Complex Cavities of Aircraft and Engine

According to the high-frequency electromagnetic field approximation theory, it is necessary to consider faradic mutual interaction of the inner surface cells in the duct. That is to evaluate mutual occlusion of the cells by RCS calculation of the inlet, nozzle and cockpit in the aircraft. In this paper, on the basis of comparing direct search and improved algorithm, parallel＋direct search algorithm and topological algorithm, a new algorithm-topology trace algorithm is proposed, which can quickly judge the mutual visibility of surface grid cells on the complex cavities. Computational analysis shows that the algorithm presented in this paper is not only applicable to evaluating occlusion of any complex cavities, but also has the compution speed faster than the other three algorithms by several times. Furthermore, the bigger the volume meshes are, the faster the computation speed is.