新型通用进气道类复杂腔体结构电磁散射计算方法

A Novel and Universal Method for Calculating Electromagnetic Scattering from Complex Inlet Cavity Structure

利用Unigraphics(UG)内部基于非均匀有理B样条(NURBS)的建模技术,采用UG二次开发,实现了在任意腔体中射线路径准确追踪,寻迹效率较高。提出一种射线追踪的新方法,解决了传统弹跳射线法(SBR)确定射线路径困难、精度不高和效率较低的问题。在此新方法基础之上开发了可以计算任意形状进气道类复杂电大腔体及角形结构雷达散射截面(RCS)的计算软件,实现了腔体建模与RCS计算的无缝集成,不用对腔体进行网格剖分,计算精度和效率都较高,使用方便,通用性好,具有较高的工程应用价值。使用该软件计算了圆形直腔、二面角和S形进气道的RCS,结果与其他方法吻合良好,具有比较好的计算精度。

Accurate and fast ray tracing in arbitrarily shaped cavities is realized in this article based on non-uniform rational B-splines （NURBS） modeling technique and a secondary development of Unigraphics（UG）. A novel ray-tracing method is developed, which overcomes the disadvantages in ray-tracing of the traditional shooting and bouncing ray （SBR） method. Software is developed based on the novel method to calculate the radar cross section （RCS） of an arbitrarily shaped complex cavity and corner structure, in which cavity modeling and its RCS calculating are integrated in UG to provide a universal and promising platform for engineers to conduct easy cavity modeling and RCS simulation with good accuracy and high performance. Finally, the RCS of a circle cylinder, a dihedral comer reflector and an S-shaped inlet is calculated, and the results demonstrate high accuracy of the proposed method.