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1)  Arc Fitting
圆弧拟合
1.
Application of Arc Fitting in NC Machining of Noncircular Profile Curve;
圆弧拟合在非圆轮廓曲线数控加工中的应用
2.
In order to enhance tooth form precision of hobbing and shaving cutter, arc fitting method has been applied to tooth form manufacturing of involute worm in the investigation of gear hobbing and shaving cutter with big modular, hard face, and high precision.
在进行大模数硬齿面高精度滚剃刀的研制中,将圆弧拟合的方法用于渐开线蜗杆的齿形制造,可以提高滚剃刀渐开线的齿形精度。
2)  biarc fitting
双圆弧拟合
1.
Building on mathematical theories of calculation geometric and function approaching method, circular-arc spline fitting and biarc fitting are gived for tabulated curve, circular-arc spline fitting is invariant in geometry , it is simple and accurate than other kinds of spline curve in calculation.
文章从计算几何、函数逼近论等数学理论出发,对列表曲线进行了圆弧样条拟合和双圆弧拟合
3)  Single Arc Fitting
单圆弧拟合
1.
Single Direction Compensation for Single Arc Fitting in Dressing of Gear form Grinding Wheel;
修整成形磨齿砂轮的单圆弧拟合单向误差补偿法
4)  elliptic arc fitting
椭圆弧拟合
5)  double are curve fitting
双圆弧拟合曲线
6)  circular arc approximation
圆弧拟和
补充资料:非线性最小二乘拟合
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性质:用最小二乘法拟合非线性方程。有些变量之间的非线性模型,通过变量变换可以化为线性模型,此称为外在线性。而有些变量之间的非线性模型,通过变量变换不能化为线性模型,通称为内在非线性。对于非线性模型y=f(ξ,θ)+ε,其残差平方和。S(θ)是θ的函数,当模型关于θ是非线性的,正规方程关于θ也是非线性的。基于使残差平方和s(θ)达到极小的原理求出θ的估计值,拟合非线性回归方程。

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