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Non-Linear Least Squares Minimization, with flexible Parameter settings, based on scipy.optimize, and with many additional classes and methods for curve fitting.

1.1 接触疲劳对滚子参数极度敏感 圆锥滚子轴承的失效模式里，接触疲劳剥落占了绝大多数。滚子与内滚道之间是线接触，名义上是一条线，实际受载后展开成一个窄矩形接触带。接触应力的峰值对滚子直径、滚子数量、接触长度这些参数非常敏感，而这种敏感性是幂函数级别的，不是线性级别。

因为 7 点法（7-point algorithm）在数值上极其不稳定：当点共面或接近共面时，系数矩阵接近奇异，解出的 F 会出现巨大误差，甚至秩不为2。 8 点法（8-point algorithm）将问题转化为最小二乘求解，鲁棒性高得多。