查询词典 numerical analysis

For analyzing the relation between uncertainty of soft numerical control real-time tasks and manufacturing accuracy, a mismachining tolerance analysis method based on model is presented.

为分析软数控实时任务的不确定性与加工精度的关系，提出一种基于模型的加工误差分析方法。

A brief introduction of numerical manifold method,a new analysis tool of rock engineering ,is given first in this paper.

阐述数值流形法的基本原理，介绍数值流形法在岩体工程中的几个应用实例，并对数值流形法的特点及其在岩体工程中的应用前景进行简要评价。

The following are main contents studied: A finite element method for Navier-Stokes equation with ALE formulation is considered and by combined with theNewmark method of numerical intergration a pressure correction scheme is obtained for the solution of the FE formulation of N-S equation. Because the incompressibility condition can be satisfied approximately in this scheme, the interpolation functions of elements can be equalorder for the velocity field and pressure field. In the ALE formulation the fluid-solid interaction analysis became a three-field coupling problem of the fluid field, the solid field and the fluid dynamic mesh. The properties and charactiristices of this three-field coupling problem are deeply discussed.

研究的主要内容有：主容器中流体大晃动是一种强非线性问题，文中研究了求解ALE描述的粘性流体N-S方程的有限元方法，以有利于大晃动自由液面的跟踪和流体大晃动中非线性现象的描述；并结合Newmark数值积分法推出了求解ALE型N-S方程的压力修正解法，由于这种解法可以近似满足不可压条件，因此可以采用速度场和压力场等阶插值的有限元离散格式，从而较好地解决了普遍采用的不等阶插值解法中，速度场和压力场数值精度不一致、程序编制不便等的不足。

Based on the numerical calculation and the analysis of the calculated results, a solution to alleviate the harm of the slurry waterhammer in the pipeline was proposed, i.e.,installing a surge tank at the highest point of the pipeline and increasing the moment of inertia of the water pump motor.

通过对数值计算结果的分析，提出了在管道顶端最高点设置调压井和增大电机飞轮力矩的方法来降低管道中浆体水击的危害。

Power and mechanical engineering ; flow characteristic ; numerical simulation ; high pressure steam valve ; qualitative analysis

动力机械工程；流动特性；数值模拟；高压蒸汽阀；定性分析

Experiments show that numerical simulation and experimental results are consistent, providing an effective analysis for spot welding on aluminum alloy.

试验验证表明，数值模拟和试验结果吻合良好，为铝合金点焊基础理论研究提供了种有效的分析手段。

Through the numerical simulation analysis, the stress concentrationstatus before the crack splits has been researched, and the have been found. Therelationships between fracture splitting force 、 factor and opening angle,curvature radius、the depth of crackle groove have been carried out.

通过数值模拟，分析了应力集中程度，得出了预制裂解槽张角、曲率半径、槽深对裂解力及几何形状因子的影响曲线。

It is important to reduce the span of the hard roof to avoid its impact load on supports. However, at longwall top coal caving face, the periodical weight of roof is a main factor that crushes the top coal, which is beneficial to the top coal recovery. How to use the roof pressure safely is of crucial importance in top coal caving. Based on field monitoring, theoretical analysis of strata movement, the numerical model of compound structure of hard roof stepped cantilever and the top coal cantilever beam is built, and the parameters of the model are also determined. The elasto-plastic finite element method is used to analyze the effect of hard coal fracture under the abutment pressure of hard roof, and the cracking coefficient is defined according to the stress state of the element.

通过对岩层移动的现场观测，建立了&两硬&条件综放采场台阶悬臂—悬臂梁组合的煤岩组合结构力学模型，并以此煤岩结构为基础，建立&两硬&条件综放采场顶煤压裂的有限元数值模型，分析了坚硬顶板不同来压步距对坚硬顶煤的压裂效应，并确定了合理的支架阻力，从而对坚硬顶板进行有效的控制，消除坚硬项板对采场的冲击隐患，同时保证采场矿压对坚硬顶煤的有效压裂，达到提高顶煤回收率之目的，由此形成了坚硬顶煤、坚硬顶板条件下综放采场围岩控制的基本理论和方法。

Through further numerical calculations and analysis, the rule of influence on acoustic radiation with respect to certain structural parameters ,as well as with respect to those of sound-absorbing layers, are discussed in detail.

通过进一步数值计算及分析，详细讨论了结构及消声瓦的各参数对远场声辐射的影响规律。

Simulated results show that the model has a better analysis capacity on both time domain and frequency domain, and can also be used in other solar photo-thermal applications.2 Numerical simulation of road snow-melting processThe whole snow-melting process, including the idling process, the snow-melting process and the after-snow process, is simulated.

模拟结果表明，该模型在时域和频域都具有良好的分析能力，而且可以推广至其它有关的太阳能光热应用领域。2道路融雪过程数值模拟在上述温度场分析软件基础上，分别对待融过程、融雪过程和融后过程进行了模拟研究。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。