计算

With the computing software MATLAB,the authors make a numerical evaluation of the velocity of the piston wind in an interzonal tunnel,analyze the influences of the train speed, the length of the tunnel, the length of the train and the blockage ratio to the piston wind.

隧道中活塞风速度的计算方法主要有两种：按恒定流计算和按照非恒定流计算。列车在隧道中的行驶所形成的活塞风实际上是随时间而变化的。

And then the isochronous field of the 17MeV-2mA H〓 Sector Focused Cyclotron is calculated and analyzed.

第四章简单介绍了工作中所用到的一些计算工具，如三维电磁场计算程序MAFIA以及等时场分析程序EQUIL，并给出了17MeV-2mA H〓扇聚焦回旋加速器的等时场的计算结果。

The calculation of urban water supply system is relative complicated in consideration of network s modeling, node demand calculation, initial flow distribution, forming of correlative matrix, universal programming, and drawing method of isopiestic line .

城市给水管网计算是一个较复杂的系统，从管网的建模、节点流量的计算、初始流量的分配、各相关矩阵的自动生成、具有通用性的平差计算到管网图形和等压线的绘制，需要考虑各种相关因素的影响。

In chapter six, A finite element model to evaluate the mechanics properties of thin wall structure is put forwards. The 4-node quadrilateral Hughes-Liu shell element with five through-the-thickness integration points is employed. The material is assumed to satisfy the elastic-plastic yield condition with isotropic hardening. The single surface contact algorithm is taken to deal with the contact searching. The priori stabilization procedures for the numerical control of the hourglass instability and the penalty method for the evaluation of contact force are used. The classical Coulomb law of friction is employed to evaluate the friction force.

第六章采用法向方向5点积分的4节点Hughes-Liu壳单元，前置参数法砂漏控制技术，等向强化弹塑性材料模型，分步增量应力回映方法，一体化接触搜寻算法，罚参数接触力计算方法及经典摩擦定律，建立了一种计算受冲薄壁结构大变形力学特性计算的有限元模型，通过对汽车A传动轴及汽车纵向方形吸能梁的大变形力学特性分析，验证了该有限元模型的正确性。

On the base of analysis, an improved iteration method is given in this paper, which can reduce the amount of calculating work from n2 to n.

通过研究和分析，本文提出了改进的迭代计算方法，避免了"0"元素的存储和计算，从而将计算工作量从二次方级降至一次方级。

In order to improve and simplify the solution, the relationship between frequency and cable tension was studied by conducting numerical iterative computation. Furthermore, the format of the existing formula for cable tension identification was investigated, and one set of practical formula for cable tension identification were proposed by employing numerical fitting method.

为提高精度及简化计算，通过分析迭代计算得到的反映频率与索力相关关系的曲线，和已有索力识别经验公式的形式特点，进行数值拟合，提出一组索力计算的实用公式。

In order to cause the result to be more reasonable, this article uses the iterative computation to convergence separately before determined the load of the forward and the after propeller respective, namely when calculates an propeller, its interference velocity which is by another propeller adds on inflow velocity to new inflow of this propeller, the continuously iterative computation for convergence.

为使水动力预报的结果更为合理，本文采用迭代计算的收敛来分别确定前桨和后桨各自的载荷，即在计算一个桨时，将另一个桨对该桨干扰速度加上该桨的来流速度来作为该桨新的来流，一直迭代计算到收敛。

The development and research progress of ground deformation induced by pipe jacking construction was reviewed in the paper.

对顶管施工引起的地面变形计算方法的发展概况及研究进展进行了分析，把地面变形计算方法归纳为现场监测方法、数值计算方法、理论方法和实例数据分析法，并进行了比较，以更好地指导工程施工。

The effects of ground on trimming and maneuvering control were studied.Taking a typical helicopter as an example,the trims for steady flight with different velocities and altitudes were first solved.Then control laws for lateral jink maneuver were obtained for helicopter NOE flight.The calculation results conform to the ground effect theory,and load factor and control variation of the maneuver can be used for reference.

以某直升机为算例，在近地飞行和考虑不同速度与高度时，分别进行了直升机稳定飞行时的配平计算，然后以侧向紧急转弯机动为例，对机动操纵规律的问题进行了计算分析，计算结果与地面效应的理论相符合，机动过载和操纵变化规律可以为飞行试验提供借鉴。

Based on decomposition-coordination model of an electric power system, the general augmented Lagrange method and auxiliary problem principle are adopted to form iterative distributed transfer capability computation framework, in which the influence on the internal system exposed by external system is considered through exchanging the information of boundary nodes.

该方法通过分解－协调模型实现互联电网的解耦，采用增广拉格朗日法和辅助问题原理实现输电能力按地理分区，形成一个迭代形式的分布式输电能力计算框架，迭代中通过交换边界节点信息将互联外网信息反映到各分区的计算中，各地的子网络计算相对独立。

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。