近似值理论

词组短语

approximation theory

与近似值理论相关的网络例句 [注：此内容来源于网络，仅供参考]

By introducing proper stretchy variable and constructing boundary layer function, it concludes N-order approximate solution, and using theory of differential inequality, uniformly validity of asymptotic expansion is proved.

通过引进适当的伸长变量，构造边界层函数，得到了解的N阶近似值，并利用微分不等式理论证明了解的渐近展开式的一致有效性。

In the paper, the stability of the static states of the system was discussed theoretically and the control parameter was determined nearby the point of Neimark-Sacker bifurcation.

首先利用理论分析了一个二维离散超混沌系统的不动点的稳定性，以此得到系统发生Neimark-Sacker分岔时参数α的近似值。

Firstly, this paper investigated roundly the basic theory of the ambient vibration method, analyzed systematically the main methods of ambient vibration identification, and discussed their advantages and disadvantages. Then we established the finite element model of structural dynamics and test model and analyzed their mutual relation, improved MUSIC method and correlation function method in the harmonic identification, and gave the subspace method and correlation function method based on continuous model, which is multi-harmonic retrieve technique. And then, this paper also puts forward least-squares method to estimate directly structural physical and modal parameters; this approach replaced the derivative operator in the continuous time model with an equivalent approximation, and estimated the physical parameters of structures by the least-squares method. And then, we discussed the approximation methods of derivative and their convergence. Finally, this paper researched the modal parameters of a frame structure by the simulation and test. The results demonstrated that subspace method, correlation function method and the least-squares method are effective and stable respectively.

全面地研究环境振动识别方法的基本理论，系统地分析环境振动识别方法的主要方法，讨论它们的优点和不足；建立结(来源：6666AB44C论文网www.abclunwen.com)构动力学的有限元模型和试验模型，分析有限元模型与试验模型之间的相互关系；改进谐波识别中的MUSIC识别方法和相关函数识别方法，给出大型结构模态识别的连续型的子空间分解识别方法和相关函数识别方法，这个方法是多元谐波识别方法；提出直接识别结构的物理参数和模态参数的最小二乘方法，这个方法利用导数的近似值代替导数值，并运用最小二乘方法识别结构的物理参数，讨论导数近似值的选择方法，分析算法的收敛性；通过仿真计算和模型实验，研究高层框架结构的模态参数识别，验证子空间分解识别方法、相关函数识别方法和最小二乘识别方法的有效性，算法的稳定性；从理论和试验两个方面分析和研究噪声对识别精度的影响，影响识别精度的因素，以及部分模态成分的模态参数不能够被识别的原因。

与近似值理论相关的网络解释 [注：此内容来源于网络，仅供参考]

approximation theorem：逼近定理=>近似定理

approximation roasted grain 近似于烘干种子 | approximation theorem 逼近定理=>近似定理 | approximation theory of price index number 近似值物价指数理论

approximation theory：近似理论

approximation of lagrange function拉格朗日函数近似 | approximation theory近似理论 | approximative value近似值

Journal of Approximation Theory：近似值理论杂志

Journal of Applied Probability 应用概率杂志 | Journal of Approximation Theory 近似值理论杂志 | Journal of Combinatorial Optimization 组合最优化学报

Schrodinger equation：薛定谔方程

他发展了化学中的企图方式,这些方式是基于对薛定谔方程(Schrodinger equation)中的波函数作不同的描写. 他创立了一个理论模型化学,其中用一系列越来越准确的近似值,系统地促进量子化学方程的准确解析,从而可以掌握企图的精度,

approximative value：近似值

approximation theory近似理论 | approximative value近似值 | arbitrary unit任意单位