quadratic approximation

A successive approximation algorithm of designing optimal disturbances rejection controllers is developed with respect to quadratic performance indexes.

关于二次型性能指标给出了一种设计最优扰动抑制控制律的逐次逼近方法。

In this paper, for the function of Chebyshev expansion, the approximating function having the approximant's order of Chebyshev polynomials is given by means of Faber mapping and quadratic Pad é approximation of power series, and it is also expressed by the fraction of Chebyshev polynomials.

对于具有Chebyshev展式的函数，文章利用Faber映射及幂级数二次Padé逼近，给出其具有关于Chebyshev正交多项式的逼近阶的逼近函数，并将其用Chebyshev正交多项式分式表示。