查询词典 numerical calculation

Compared with traditional numerical methods such as the FEM, FDM, etc, the LB method has several important features, including: simplicity in algorithm, easily programming, direct calculation of pressure from a state equation and amenability to simulate all kinds of flow field with complex boundaries, it also has much advantage in the respect of parallel computation because of its regional evolution.

与传统的计算方法如FEM、FDM等相比，LB方法具有算法简单、编程容易、压力可以通过状态方程直接求解、能够模拟各种复杂边界的流场等优点，并且计算的局域性使其在并行计算方面也具有很大的优势。

In example of two -dimensional numerical analysis, the roekfall motion trace, angular velocity and jumping height in horizontal and vertical directions were defined, which provided necessary calculation data for engineering measures of disaster prevention and mitigation.

在二维落石运动路径的实例数值分析中，明确了落石水平垂直方向的运动路径、角速度和跳跃高度，为防灾减灾的工程措施提供必要的计算数据。

A simplified approximate calculation method is present in this paper for the central principal axis stiffness of numerical control processing.

这篇文章介绍了一种简化的近似计算数控加工中心主轴组件的方法。

Combining the definition of CWT and the derivative property of convolution, we constructed a general method to calculate the approximate derivative of signal through CWT by using the first and second derivative of Gaussian function, Haar, and the first derivative of three-order-Spline function as wavelets. As compared with the other approaches of calculating derivative, which include the numerical differentiation, polynomial filters, Fourier transform, and the recently proposed DWT method, fast calculation and simple mathematical operation were remarkable advantages of CWT method. For the signal corrupted by severe noise (Signal-toNoise Ratio=5), the satisfactory results could also obtained via CWT method through appropriately adiusting the dilations.

在此基础上，(1)结合连续小波变换的特点和卷积的微分性质，提出了使用Gaussian函数的一阶和二阶导数，Haar和三次样条函数的一阶导数作为小波函数的连续小波变换计算信号近似导数的一般性方法，与其他导数计算方法(包括数字微分法，多项式滤波法，Fourier变换法和离散小波变换法)相比，本法简单便捷，计算速度快，对于噪声含量较高的信号(S/N为5)，只要适当调节尺度即可获得比较满意的结果。

Meanwhile, as a numerical approximation method, calculation error of meshless method is inevitable, so the adaptive process is programmed.

同时，作为一种数值近似计算方法，无网格法的计算误差是不可避免的，因此引入自适应方法。

We introduce the principle and arithmetic of Finite Difference Time Domain method particularly, and primarily discuss on several essential questions including excitation sources, the conditions of stability of calculation, and Perfectly Matched Layer boundary conditions. All of these factors have effect on the results of the numerical simulation.

2详细介绍了有限时域差分法(Finite Difference Time Domain， FDTD)的原理和算法，着重讨论和分析了激励源设置、FDTD法的稳定条件、PML吸收边界条件等几个关键问题，这些因素会直接影响模拟结果。

The velocity distribution of the numerical simulation and the theoretical equations calculation are compared on the condition of axial symmetry.

结果表明，在轴对称条件下，对数模、理论计算的速度分布进行对比分析，证实了旋涡流场不仅是径向的函数，而且还是轴向的函数。

Took Chongqing Gong-he tunnel as an engineering example and studied the failure mechanism of surrounding rock and the correlation with bolt support system by using the methods of theoretical analysis, modeling test, numerical simulation and in situ test, some helpful conclusions were arrived as follows.Firstly, a new failure criterion for transversely isotropic rock mass was proposed with consideration of bedding plane orientation and major principal stress, and the corresponding algorithm, arrived through VC++6.0, can be easily embedded into the software FLAC3D for the geotechnical calculation.

论文在国家自然科学基金专项基金创新群体基金项目(No.50621403)以及国家自然科学基金重点项目"隧道与地下空间工程结构物的稳定性与可靠性(No.50334060)"的资助下，以共和隧道为示范工程，运用理论分析、物理模型实验、数值模拟和现场测试等手段，对共和隧道大埋深段层状岩体的围岩变形破坏机理、锚杆支护力学效应及围岩-支护结构的变形特征等内容进行了研究，其主要研究成果有：①在总结和探讨国内外学者提出的层状岩体经验型连续介质破坏准则基础上，结合层状岩体力学特性，考虑层面方向和最大主应力方向两个影响因素，提出了共和隧道层状岩体横观各向同性破坏准则；采用汇编语言VC++6.0实现了横观各向同性弹塑性本构关系的算法，并嵌入FLAC3D有限差分数值分析软件接口中实现数值运算。

This paper presents the boundary value problem solved as the biharmonic equation of upper plane and strip domain with Green functional method and it deals with the numerical solution of bihormonic equation, using the Matlab program calculation to realize the visualization of numeric solution.

用Green函数法求解了区域为上半平面和带形区域的双调和泊松方程的边值问题；以及探讨了双调和方程的数值解，并用Matlab编程计算实现了双调和方程数值解的可视化。

Finally, a calculation example of Bingham oil was shown the numerical difference of the two methods.

本文以Bingham流体为例，对非牛顿流体的差分方法进行了研究，从理论上分析了势梯度分量差分方法的错误，并提出了正确的势梯度模差分方法，最后给出了显示二种方法差别的数值计算实例。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。