From this paper, the equations of tangent planes of a quadratic surface are obtained by matrix operations.
本文应用矩阵的运算，给出求二次曲面的切平面方程的一个筒单方法。
The problem to determine the principal axis of quadratic surface is summed up to be that of finding the stop point of J-function.
并将确定二次有心曲面的主轴问题，归结为求J函数的逗留点问题。
In the paper, large deformation of symmetry fission has been described by a biquadratic surface revolution instead of several quadratic equations.
本文用四次方程代替常用的几个二次方程曲线的回转体，来描述对称裂交的大形变过程。
The main content: vector algebra, plane and linear space, special surfaces and secondary surfaces, general quadratic surfaces and general quadric surface.
主要内容有：向量代数、空间的平面和直线、特殊曲面和二次曲面、一般二次曲面和一般二次曲面。
As an important approach for improvement of productive efficiency and shape design, more and more attention is paid for reverse engineering, fitting of quadratic surface is one of its components.
作为提高生产效率和改善造型设计的重要途径，逆向工程受到越来越多的重视，空间二次曲面拟合是其重要组成部分之一。
Nowadays, general fitting methods are based on the character equations of quadratic surface to implement. For it is so complicated that a lot of fitting software exist a lot of restrict conditions.
目前的通用方法都是基于二次曲面的特征方程进行拟合，由于特征方程求解复杂，因此这些拟合软件在进行曲面拟合时均存在很多的限制条件。
Nonlinear regression and quadratic response surface models.
非线性回归和二次响应面模型。
The optimum design of plane quadratic enveloping ring surface worm drive has been realized using the theory and method of optimization.
针对平面二次包络环面蜗杆传动，运用优化理论和方法，对其进行了优化设计。
Auxiliary surface is commonly used as a graphic solution for the projections of the intersection line of quadratic cambers of revolution.
在两个二次回转曲面体相贯线的求解中，辅助面法是常用的图解方法。
A modified linear quadratic optimal controller is designed for the linear part, while adaptive gain is used in the nonlinear part for adapting to different control surface damages.
线性部分采用改进的线性二次型最优控制器法进行计算，而非线性部分采用自适应增益来更好地适应故障情况。
For structural reliability analysis of complex nonlinear implicit limit state equation, this method had lower error and higher precision than the traditional quadratic response surface method.
对于复杂非线性隐式极限状态方程的结构可靠度计算，该方法比传统的二次响应面法误差小、精度高。
Firstly part of quadratic term of Taylor series is chosen; a low-dimension surface is used to approximate limit state surface; and the modified reliability formula is derived.
首次选取泰勒级数的部分二次项，用一个距原点最近点处拟合的超低维曲面近似极限状态面。
To achieve the soft landing on a specified region of lunar surface, the paper studies a linear quadratic optimal guidance method for lunar soft landing.
为实现在月球表面指定区域的精确软着陆，研究了月球软着陆的线性二次型最优制导方法。
Given a response surface equation in quadratic form, the Six Sigma Black Belt will be able to compute the stationary point.
给出一个二次方程序形式的响应曲面公式，六西格玛黑带应能计算出驻点。
At realm of surface roughness of machined surface, forecast mathematical model is set up by using quadratic regression orthogonal design between NC turning parameter and machined surface.
在已加工表面粗糙度研究领域引入回归正交分析，采用多元二次回归正交设计得到了数控车削参数与已加工表面粗糙度的回归预报模型。
Based on clustering normal and attack training samples, by defining approaching degree of boundary surface of every clustering center, quadratic expression of standard SVM is improved;
通过对正常和攻击样本的聚类分析，定义聚类簇中心的边界面接近度因子，实现对标准SVM二次式的改进；
The response surface approximation models are used to replace the original complex vehicle performance model, the optimization is conducted using a sequential quadratic programming algorithm.
通过响应面近似模型的优化，完成了高超声速巡航飞行器的多学科设计优化。
Based on the results of single-factor experiments, a quadratic regression model was established with the help of two factors central composite experimental design and the response surface method.
在单因素试验基础上，利用二因素中心组合设计原理及响应面法分析建立二次回归模型。
Based on the results of single-factor experiments, a quadratic regression model was established with the help of two factors central composite experimental design and the response surface method.
在单因素试验基础上，利用二因素中心组合设计原理及响应面法分析建立二次回归模型。
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