计算物理 ›› 1993, Vol. 10 ›› Issue (3): 290-296.

• 论文 • 上一篇    下一篇

位场奇异积分计算与斜率变量

边少锋1, 吴晓平1, 刘权威2   

  1. 1. 中国人民解放军测绘学院, 郑州 450052;
    2. 太原工业大学 030034
  • 收稿日期:1991-10-22 修回日期:1993-04-29 出版日期:1993-09-25 发布日期:1993-09-25

THE EVALUATION OF SINGULAR INTEGRALS IN, POTENTIAL FIELDS AND THE SLOPE VARIABLE

Bian Shaofeng1, Wu Xiaoping1, Liu Quanwei2   

  1. 1. Zhengzhou Institute of Surveying and Mapping, Zhengzhou, 450052;
    2. Taiyuan Industry University, 030024
  • Received:1991-10-22 Revised:1993-04-29 Online:1993-09-25 Published:1993-09-25

摘要: 定义y/x作为新的变量z,将其与x作为一组新的变量(x,z)借以取代(x,y),结果表明这组新的变量(x,z)几乎可使位场与距离倒数1/r有关的奇异积分都非奇异。利用这组新的变量,本文给出了位场有关量的解析表示。本文还给了斜率变量使用前后的有关数值对比,结果表明在新变量形式下,数值积分收敛很快。

关键词: 奇异积分, 变量替换, 数值分析

Abstract: Definiting the slope y/x as a new variable z, the variable transformation from (x, y) to (x, z) is presented. It is found that such a set of new variable (x,z) almost makes the singular integrals dependent on the distance reciprocal r in potential fields become non-singular. By using the new variable, analytical expressions concerning common singular integrals in potential fields are derived as well. Numerical results show that the numerical integration con verges very fast with the method.

Key words: singular integral, variable transformation, numerical analysis