摘要
混凝土多轴疲劳试验样本因其含有大量的重复数据和试验数据离散性极大,因此许多传统的方程拟合方法都不适于这类特殊问题。对基于最小二乘法的多元线性或可化为线性的非线性拟合问题,对一切可能方程的求法进行了改进,并对各种方法进行了全面比较研究,最后找到了适用于混凝土疲劳这一类特殊问题拟合的R估计方法。利用相对较好的拟合方程查找异常值,然后据此分析异常值产生的原因,从而指导进一步的试验或者对异常值进行有效处理。
There are a lot of similar data in specimens of concrete multiple axes fatigue tests. On the other hand, concrete fatigue test data scatter greatly, so many of conventional fitting equation methods are not suitable to this kind of sspecial pnoblems. This paper studies and compares the mended whole instances of fitting question of multiple linear or nonlinear of linear based on least squares method, and brings forwarda selecting method for all possible fitting equations, and finds R-estimation used in a kind of special problem fitting as concrete fatigue in the end; the next step is to find out singular values by better fitting equations, then to analyse reasons, so that the next step test can be done better or singular values can be availably disposed.
出处
《海洋工程》
CSCD
北大核心
2004年第1期103-106,共4页
The Ocean Engineering
基金
国家自然科学基金资助项目(50078010)
关键词
拟合
最小二乘法
R估计
混凝土
疲劳
fitting
least squares method
R-estimation
concrete
fatigue
