摘要
对于给定的等幅疲劳成组试验数据 ,利用三参数幂函数方程来描述P -S -N等幅曲线。通过线性拟合相关系数的最优化来确定其中三个系数 ,采用割线法进行最优化求解。该方法具有迭代收敛快。
According to the given experimental constant amplitude fatigue life group data ,the three parameter exponential function equation can be adopted to describe the constant fatigue P-S-N curve. Three parameters can be determined through the optimization of the absolute value of the linear regression coefficient ,and this can be achieved by the secant method. It is showed that this new method is very accurate as well as very fast in convergence.
出处
《海洋工程》
CSCD
北大核心
2002年第2期74-77,共4页
The Ocean Engineering
基金
国家自然科学基金资助项目 (5 960 5 0 10
5 99790 15 )
关键词
等幅疲劳
等幅曲线
最优化
割线法
对数正态分布
fatigue reliability
P-S-N curve
curve fitting
secant method
logarithm normal distribution
