论文部分内容阅读
针对矩形网射线追踪存在的模型剖分灵活性差、速度界面描述精度差等问题,研究了复杂结构三角网最小走时射线追踪全局算法。(1)根据剖分区域点、线、面的结构关系,遵循Delaunay三角剖分的优化准则进行三角网格剖分;(2)定义三角单元射线追踪的拓扑关系;(3)波源点及某一时刻波到达的每一个节点点构成波行面,在波行面扩展过程中计算节点的最小走时和次级源位置,实际次级源检索采用双曲线近似算法;(4)利用各节点走时和次级源方向信息,通过最小走时搜索,拾取从接收点到源点的射线路径。数值模拟结果表明,三角网射线追踪方法模型剖分时灵活性强、速度间断面的描述精度高,追踪结果准确。
In view of the problems of poor meshing accuracy and poor description accuracy of the rectangular mesh, the global minimum traveltime ray tracing algorithm for complex structure triangulation is studied. (1) According to the structural relationship of points, lines and planes in the subdivision area, triangulation is performed according to the optimal criteria of Delaunay triangulation; (2) the topological relations of ray tracing of triangular elements are defined; (3) For each node arriving at a time wave, the minimum traveling time and secondary source position are calculated in the wave spreading process. The actual secondary source search uses the hyperbolic approximation algorithm. (4) And secondary source direction information, through the minimum travel time to pick up the ray path from the receiving point to the source point. The numerical simulation results show that the method of triangulation ray tracing method has the advantages of high flexibility and high precision of velocity discontinuity, and the tracking result is accurate.