查询词典 numerical method

Finally, some preliminary numerical results of this method are given, and it indicates that the method is effective.

最后，一些初步的数值结果表明方法是有效的。

Numerical tests shows that indicator function method is a simple and fast method, by which better reconstruction can be gained for no superior knowl-edge of the physical properties about media.

数值实验表明，指示函数方法简单快速而准确，能在不对介质的物理性质有先验的假设基础上，给出较好的重构效果。

With the compare of research methods such as direct experiment, indirect method and numerical simulation method, and with the applied background of the Virtual Prototype technology, the paper puts forward a new strategy for the design of the testing device for dynamic response of road based on Pro/E、 ADAMS and ANSYS software. On the basis of the theory, this paper analyze the scheme and the important parts, and has proposed that actual modeling parameter, pattern and arrangement scheme, and structured the complete machine scheme of a testing device for testing road dynamic response based on dynamic load of vehicle-road.

本文在系统分析了各种车路系统动载荷研究方法的基础上，针对直接试验方法、间接试验方法和数字仿真方法的发展，并结合"虚拟样机"技术的应用背景，提出了一种基于Pro／E、ADAMS和ANSYS软件的基于车路动载荷的测试路面力学响应的试验装置的虚拟样机的实现策略，并在此基础上，对方案和重要部件进行了分析，提出了实际的建模参数、型式和布局方案，构建了一种基于车路系统动力学的测试路面动态力学响应的试验装置的整机方案。

A modified backward Euler method is developed which enables to increase considerably the accuracy of jump voltage computation as a result of freeing its computing from the influence of the faint asymmetrical initial current in such an inductive circuit as converter and completely eliminate numerical oscillation in converter simulation as often seen in the case of implicit trapezoidal integration method.

本文提出一种变形的后退欧拉法，用该法对换流器这样的纯电感电路进行跃变电压计算，可完全避免初始电流中微弱的不平衡对跃变电压计算的影响，大大提高了跃变电压的计算精度，并彻底消除了隐式梯形积公法用于换流器仿真时所存在的非原型数值振荡。

This paper introduces the simulation method and advanced computer technology combining with ship statics principle into cargo shipment of bulk grain carrier,and develops loading simulation system of the bulk grain carrier. And introduce the principle of system and method of implement particularly. This Paper describes the relating high precision calculation algorithms of the stability,trim and strength calculation used by the loading software in detail,focuses on the algorithms of numerical value integral and curve difference and imitate algorithms.

另外，本文还引入模拟的方法，采用先进的计算机技术，结合船舶静力学原理和散装谷物船舶稳性校核的特殊要求，开发了散装谷物船舶的装载模拟系统，并详细介绍了该系统的原理和实现方法，在计算方法上，采用了高精度的浮态、稳性、和强度的计算方法。

The research achievement are acquired as follows: 1From mathematical models for inverse scattering in two dimensional homogenous media including Dirichlet, Neumann, Robin,all kinds of probable mixed boundaries and cracks, direct and inverse scattering are discussed, and ill-posed integral equation and indicator function method are formulated for the diverse of boundary identification. It is shown that the kernel of the integral equation characters the boundary of scatterer, which is determined by solving it by virtual of regularity method, meanwhile, some numerical tests are given.

本研究取得了如下研究成果： 1）在二维均匀介质逆散射各种边界识别的数学模型（包括Dirichlet，Neumann，Robin，各种可能的混合边界问题，裂纹问题）下，分别考虑了正散射问题和逆散射问题，推导了上述各种边界识别的不适定积分方程以及指示函数方法，由于积分方程的核充分表征了散射物的边界，由此说明只要利用正则化方法求解该积分方程，就可以确定散射物的边界，并给出了一些数值实验。

A optimal space interpolation method, Kriging method , was introduced to groundwater numerical simulation in this paper.

本文详细介绍了空间优插值方法—克里格法的原理及计算步骤，并将其应用于地下水数值模拟初始流场的形成，提高了模拟的精度和效率。

The use of numerical value different method made the results intuitionist and creditable, which provides an effective simple method for the future power matching calculation about wind-PV system

同时数值分析插值法第一次在风光混合系统优化匹配中使用，得到的结果直观且具有可信性，希望能为以后的风光系统的使用提供一个简单、实用的方法。

In the ***, all types and fundamental principles of Radon transform are summarized systematacially. This *** starts from the general linear Radon transform, and then researches how to use the damped least square method to find the solution of the forward transform. However, the least squares smoothing effect will lead to a certain degree of trails in the data of Radon domain, which led to the application\'s limitations. After that the implementation in Radon domain and relative merits of linear Radon transform, parabolic Radon transform and polynomial Radon transform which have time invariance are introduced, the conjugate gradient method that can solve numerical solution is also given. And then the high resolution Randon transform is discussed, it introduces the regularization theory and Bayes principle into inversion, which successfully remove the negative affect caused by discrete Radon transform. Finally, we introduce the optimal weighting similar coefficient Radon transform, which adapt to the time variant quality of hyperbolic Radon transform.

本文系统总结了Radon变换的各种类型及其基本原理，从τ- p变换(即一般线性Radon变换)出发，研究利用阻尼最小二乘平方法求解其正变换，但是最小平方法的平滑作用会导致Radon域数据存在一定程度的拖尾效应，给这种方法的应用带来了很大的局限性；然后先容了具有时不变性的线性、抛物和多项式Radon变换在频率域的实现及其优缺点，给出了求解其数值解的共轭梯度算法；接着讨论了高分辨率Radon变换，它把正则化思想和贝叶斯原理引进到了反演中，很好的克服了离散Radon变换产生的截断效应对结果的不利影响；最后先容了适应双曲Radon变换时变性质的高分辨率最优相似系数加权Radon变换。

By the principle of penalt function, the irrotational fluid field is constrained, and author has proposed the Difference Method for distinguishing fluid vortex modes among the natural modes of coupled systems. Author has calculated the real frequencies with the extra deductive method, and discussed the influence of the numerical solution due to the irrotational constraint.

对于流体有限扰动时的非线性耦合系统的有限元分析作了一些探讨，给出了非线性系统的基本方程、变分原理及有限元方程，并具体地导出了三维几何非线性流体单元的切线刚度公式，采用增量形式的Newmark预报——校正逐步积分法计算系统的动力响应，由Newton-Raphson迭代法及其修正方法求解系统的非线性方程组，还列出了不平衡力余量检查和位移迭代增量检查等迭代收敛判断准则。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。