Since the gradient of the velocity is high in the mould, the control method of simulation points is applied in the least square approximation.
由于口模内速度变化梯度较大，采用最小二乘近似节点控制方法来控制近似效果。
The two methods of model simplification are presented for large scale systems, they are the least square approximation and the rational fraction approximation.
本文针对大系统的频域模型简化提出了两种方法：最小二乘近似法和有理分式近似法。
And then an new iterative method is presented to solve the nonlinear equations system obtained from moving least-square approximation.
之后，借鉴牛顿法、平衡法和摄动法对由移动最小二乘法得到的非线性代数方程组提出了新的求解方法。
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