查询词典 numerical

This dissertation realizes one computer numerical control system for two and half axises upright numerical control milling machine using computer software, hardware and DSP technology.

本论文利用计算机软、硬件技术、DSP技术，实现了用于两轴半立式数控铣床装置的计算机数控系统。

There are two modeling methods used in this research area, that is analytical method and numerical method. Analytical method can be used to analyze the sound pressure within enclosures, and to analyze the control mechanisms theoretically, however it can be used for regular cuboids only. Numerical modeling method can manage enclosures with arbitrary boundaries, nevertheless, the results obtained using this method are dispersed sound pressure. It is hard to conduct real time control with this method. The two modeling methods have their own inherent defects.

对于封闭空间的结构声辐射，目前有解析建模和数值建模两种建模方法，解析建模方法可以从理论上对系统进行分析，探讨消声机理，但它只适用于长方体等规则封闭空间；数值建模方法不受空间边界形状的限制，得到的是空间声压的离散结果，难以用于实时控制，两种方法都存在着局限性。

From the analysis and comparing with different illustration, it proves that the numerical model used in this paper is correct and the results of numerical study are in agreement with the facticity about the flow field.

通过对数值计算结果的分析和比较，证明数值模拟所用的计算模型是有效的，较好地反映了旋流器内液固两相流场的物理真实性。

Both numerical control induction machine tool X-Z axis and slew workbench of part drive by numerical contral, the coil feed motion is drived with servo motor which joins to ball screw assemblly to carry out.

数控感应淬火机床X-Z轴和工件的回转工作台均采用数控驱动，感应头的进给运动通过伺服电机带动滚珠丝杠来实现。

Both numerical control induction machine tool x-z axis and slew workbench of part drive by numerical contral,the coil feed motion is drived with servo motor which joins to ball screw assemblly to carryout.

本设计课题紧跟现代数控技术的发展，针对具有曲线形状的板类、盘类及需要精密分度的零件表面热处理要求而设计。

This paper introcluces the design and calculation procedure of vertical feed ball screw auxiliary in X6132 milling machine numerical control transformation,It also discusses consciously design the choice of accuracy,The purpose is to provide design reference for numerical control machine transformation of other kind

本文介绍了X6132铣床数控改造中纵向滚珠丝杠副的设计计算过程，并对选择精度的3个原则作了简单介绍，可供其它类型的机床数控改造滚珠丝杠副设计及选用参考。

In chapter 1, the history of numerical simulation of extinguish fire is introduced. The technique and theory of fire suppression by water mist are presented, and the sort of numerical simulation of extinguish fire is discussed.

第一章回顾了细水雾灭火过程数值模拟的发展历程，介绍了细水雾灭火技术和灭火机理，同时阐述了火灾数值模拟的分类，以及国内外在灭火数值模拟方面的研发现状。

In this dissertation the"Penalty"finite element method was employed to compute the velocity of the three-dimensional flow of power-law fluid in a profile die. In order to decrease the needed computer memory and raise the stability of numerical simulation, a set of decoupled methods such as PFEM, pseudo-body force method and transformation of momentum equation to the elliptic equation was developed to establish the general finite element equations to compute the distributions of velocity and viscoelastic stress of the three-dimensional viscoelastic flow of the Phan ThienTanner fluid in a profile die. During numerical simulation of the extrudate swell of the PTT fluid, the flow in the die and out of the die was analyzed separately, which demands less computer memory.

本文建立了求解挤出口模内幂律流体流动速度场的通用三维罚有限元模型；对于非线性粘弹性的Phan Thien-Tanner流体，为了降低模拟计算对计算机硬件的要求，并使模拟计算更加稳定，采用了一种去耦算法，包括罚有限元方法、拟体力方法和动量方程的椭圆类方程转化方法，并建立了求解速度场和粘弹性应力场的总体有限元方程；对于PTT流体的挤出胀大问题，提出了挤出胀大熔体口模内外分离模拟法，这样可以显著降低数值模拟对计算机硬件的要求。

Furthermore the numerical flux from the Riemann solver is delicately expressed in a compact manner, say by the well known Godunov flux function, which paves the way to full investigation of numerical approximations.

由上述的Riemann解所提供的数值流通量经仔细验证后可以被简洁地表示为Godunov流通量的函数值，这为研究一般意义下的数值逼近铺平了道路。

Based on numerical simulation flow after treatment methods and implementation. This paper drawing river ice jam thickness contour map, vertical water flow under the ice jam contour map as an example, the use of Surfer software described in detail various graphics rendering; Focused on the Surfer with VB programming software secondary development to achieve flow numerical simulation after treatment, showed that automatic change the data files to the Surfers;Introduced Active automation technology and Visual Basic Application Program Interface, and the interface technology will combinate VB powerful software development capabilities and Surfer software powerful mapping functions , achieve the key code and the mapping results map examples: under the ice sheet flow velocity field vertical contour map, three-dimensional wire-frame plans, such as flow field vector graphics, and dynamic display and output the graphics.

基于水流数值模拟后处理的方法与实现，本文以绘制河流冰塞厚度等值线图、冰塞下水流纵向流速等值线图为例，详细介绍了运用Surfer软件绘制各种图形的方法；重点阐述了用VB编程对Surfer软件进行二次开发实现水流数值模拟后处理，显示向Surfer数据文件自动转换的过程；介绍了Active自动化技术及其与VB应用程序的接口技术，并利用该接口技术将VB的强大软件开发能力和Surfer软件强大的绘图功能相结合，给出了实现该接口技术的关键代码以及绘制成果图件的实例：冰盖下流速场纵向流速等值线图、三维线框图、流场矢量图等图形，并输出图形与动态显示。

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。