计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (17): 210-211.

• 工程与应用 • 上一篇    下一篇

计算机精度对随机场网格尺寸的影响

徐腾飞,赵人达   

  1. 西南交通大学 桥梁工程系,成都 610031
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-11 发布日期:2011-06-11

Effect of computer precision on mesh size of random field

XU Tengfei,ZHAO Renda   

  1. Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-11 Published:2011-06-11

摘要: 分析了随机场相关模型离散后的近似随机场相关系数矩阵的正定性。根据计算机常用变量的表示范围,确定指数衰减模型的随机变量数目上限的估计公式,数值分析了平方指数衰减模型。结果表明随机场最小网格尺寸与相关长度有关:相关长度越长,最小网格尺寸越大,随机变量数目上限越小;在相同的相关长度下,平方指数衰减模型的最小网格尺寸较大。

关键词: 随机场, 相关系数矩阵, 网格尺寸, 相关长度

Abstract: Positive definiteness of correlation coefficient matrixes of approximate random field is investigated.The upper limit of random variables of exponential decay model is induced,considering the range of variables in person computer.Similarly,the square exponential decay model is studied by numerical method.The results demonstrate that the size of minimum mesh increases with increment of coefficient of correlation length.Meanwhile,the size of minimum mesh of square exponential decay model is larger than that of exponential decay model.

Key words: random field, correlation coefficient matrix, mesh size, correlation length