湖南大学学报（自然科学版）
湖南大學學報（自然科學版）
호남대학학보（자연과학판）
JOURNAL OF HUNAN UNIVERSITY(NATURAL SCIENCES EDITION)
2014年
1期
39-44
,共6页
射线追踪%LTI算法%交叉扫描%扩张%收缩扫描法%改进算法
射線追蹤%LTI算法%交扠掃描%擴張%收縮掃描法%改進算法
사선추종%LTI산법%교차소묘%확장%수축소묘법%개진산법
ray tracing%LTI algorithm%cross-scan%extension & compaction scanning algorithm%im-proved algorithm
在LTI(Linear Travel-time Interpolation)射线追踪算法基础上提出的扩张收缩扫描算法能正确追踪直达波、绕射波和回波的射线路径，但其存在计算效率低、收敛速度慢的问题。采用交叉扫描方式对扩张收缩扫描算法进行改进，并由此提出了基于交叉扫描方式的扩张收缩扫描改进算法。理论分析及数值模拟结果表明：改进算法在保留了原扩张收缩扫描算法所有优点的同时，具有更高的计算效率；当模型网格尺寸划分较细时，改进算法在计算效率上的优势更为显著。
在LTI(Linear Travel-time Interpolation)射線追蹤算法基礎上提齣的擴張收縮掃描算法能正確追蹤直達波、繞射波和迴波的射線路徑，但其存在計算效率低、收斂速度慢的問題。採用交扠掃描方式對擴張收縮掃描算法進行改進，併由此提齣瞭基于交扠掃描方式的擴張收縮掃描改進算法。理論分析及數值模擬結果錶明：改進算法在保留瞭原擴張收縮掃描算法所有優點的同時，具有更高的計算效率；噹模型網格呎吋劃分較細時，改進算法在計算效率上的優勢更為顯著。
재LTI(Linear Travel-time Interpolation)사선추종산법기출상제출적확장수축소묘산법능정학추종직체파、요사파화회파적사선로경，단기존재계산효솔저、수렴속도만적문제。채용교차소묘방식대확장수축소묘산법진행개진，병유차제출료기우교차소묘방식적확장수축소묘개진산법。이론분석급수치모의결과표명：개진산법재보류료원확장수축소묘산법소유우점적동시，구유경고적계산효솔；당모형망격척촌화분교세시，개진산법재계산효솔상적우세경위현저。
The extension & compaction scanning algorithm based on LTI (Linear Travel-time Interpo-lation)ray tracing algorithm can properly trace the ray path of the direct wave,diffraction wave and echo 's,but it has the following problems:low computational efficiency and slow convergence speed.Aiming at these problems and using the cross-scan mode to improve the algorithm,an improved extension &compac-tion scanning algorithm based on the cross-scan mode was presented.Theoretical analysis and the results of numerical calculation show that the improved algorithm not only maintains all the advantages of the ex-tension & compaction scanning algorithm,but also has a higher computational efficiency.When the model is mesh more refined,the advantage of the improved algorithm is more significant in computational efficien-cy.
