查询词典 numerical calculation

Numerical simulations showed the axial velocity in the precessing flow were decreased significantly because of the entrainment of ambient air. The swirling motion, the wall attachment effect and the reverse flow were also found in the numerical flow field. It is shown that the simulation results of the precessing jet flow accord well with the analysis and the previous work.

数值模拟表明旋进射流的轴向流动速度衰减得很快，流场中存在明显的旋流、附壁效应和反向回流现象，所得到的结果与已有的分析结论基本吻合。

By studying the numerical simulation technology of sheet metal formation in recent decades,the article puts forward a method for redeveloping friction model of numerical simulation of sheet metal formation on the basis of ABAQUS.

对近年来兴起的板料成形过程数值模拟新技术研究，提出了一种基于ABAQUS的板料成形数值模拟摩擦模型的二次开发及实现的方法。

It was proved through experiment that optimum passive numerical shimming can achieve a high level in superconducting NMR imaging magnets and it can be realized very easily and very economically. Field regression is not absolutely necessary in the technique of optimum passive numerical shimming, but it is useful to know the structure of the field error Bz'.

磁场回归在超导核磁共振成像主磁体的无源数值匀场技术中虽然并不是绝对必需的，但在对主磁体进行无源数值匀场时，如能知道成像空间内不均匀磁场的磁场偏差B〓的结构，也是非常有用的。

Has the advanced mechanical device, the abundant technical force, has the unique research to the wiredrawing equipment, the product quality is reliable, produces numerical control clean ball machine, combined drawing machine, completely automatic multi-purpose numerical control belt stuffing noodle maker, electricity galvanization machine equipment, for this factory leading product.

拥有先进的机械设备，雄厚的技术力量，对拉丝的设备有独特的研究，产品质量可靠，其中生产的数控清洁球机，组合式拉丝机，全自动多功能数控带馅面条机，电镀锌机设备，为本厂的主导产品。

Finally, the numerical simulation approach of tool wear was studid on the basis of numerical simulation of SPIF, and the process parameters on the impact of the tool wear were researched.

最后，在渐进成形数值分析的基础上，探讨了对工具头磨损进行数值模拟分析的方法和流程，并通过仿真，研究了工艺参数对工具磨损的影响关系。

Based on the literature review, this paper analyzes and investigates the development and status of digital image processing techniques in quantitative analysis and associated numerical simulation of the geomaterials. It includes quantitative analysis of particle shapes, quantitative analysis of internal structures of soil, rock, asphalt concretes and cement concrete, quantitative analysis of macro-structures of rock mass in the ground, and numerical modeling and simulation of geomaterials by taking into account their actual internal structures, Based on the review results, the paper discusses the development history and future trend of the utilization of the digital images and associated techniques in soil and rock.

本文在研究相关文献的基础上，分析和研究了数字图像技术在土、岩及混凝土内部结构定量分析和力学数值计算中的发展过程和研究成果，内容包括：单个骨料颗粒形态特征定量分析；土、岩和混凝土内部结构定量分析；岩体结构定量分析中的应用；基于数字图像处理的土、岩和混凝土细观结构力学计算。

CAD/The CAM technology development, enables in the numerical control processing to become directly using the CAD design data possibly, specially the microcomputer and the numerical control engine bed joint, causes the design, the craft plan and the programming entire process completes completely on the computer, does not need to output the special technological document generally.

加工表面粗糙度要求低时，vF 可选择得大些。在加工过程中，vF 也可通过机床控制面板上的修调开关进行人工调整，但是最大进给速 www.3722.cn (整理。版权归原作者所有)如果您不是在 3722.cn 网站下载此资料的，不要随意相信。请访问3722，加入 3722.cn 必要时可将此文件解密度要受到设备刚度和进给系统性能等的限制。

The results show that:(1) The penetration resistance of functionally graded layered armour made of metal Matrix Composites is better than that of the Aluminum plate;(2) The penetration resistance of the functionally graded layered armour whichlay_up is 0%/57%/0%/26%/0%/12%/0% is the best;(3) The resistance penetration of the the functionally graded layered armour can be greately promoted through optimizing the lay_up and volume fraction of the reinforced particle;(4) The functionally graded armour in which the particles distribute continuous has better behavior of resistance penetration when the volume fraction of the reinforcements are constant;(5) The higher volume fraction of the reinforcements at the surface of FGM and the more non-homogeneous the reinforcements distribution, the higher thesurface Youngs Modulus and the flow stress are;(6) The behavior of penetration resistance of the functionally graded armour in which the particles distribute continuously is better than that of homogeneous steel plate;(7) The functionally graded armour provedes a important approach for the optimization and design of the resistance penetration;(8) The numerical results of simulation of the bird striking the aircraft structureshow that the finite element model of the balance leg is effective;(9) The numerical results show that the structure internal force is relative largewhen the bird strikes the top of the balance leg;(10) The process of the birdstrike is thaf.after the bird penetrting through the front skin of the balance leg and striking the front beam,the bird is broken up in three parts.

经过本文所进行的数值模拟后我们发现：(1)在层状梯度装甲板的抗侵彻过程中层状功能梯度板比铝板的抗侵彻性能好；(2)在层状梯度装甲板的抗侵彻过程中铺层顺序为0%/57%/0%/26%/0%/12%/0%的功能梯度装甲板的抗侵彻性能最好；(3)通过优化组合层状梯度板的铺层顺序以及增强颗粒的含量可以大大改善梯度板的抗侵彻性能；(4)当SiC颗粒体积含量一定时，增强颗粒连续分布的功能梯度板表现出了优越的抗侵彻性能；(5)增强颗粒连续分布的功能梯度板表面SiC颗粒体积含量越高，分布越不均匀，表面的弹性模量就越高，屈服应力就越高；畜此工业大学硕士研究生学位论丈(6)增强颗粒连续分布的功能梯度装甲板比匀质钢板表现出良好的抗侵彻性能；(7)功能梯度装甲板为整个抗侵彻性的优化设计提供了重要的途径。

For such a shallow water Twin-skeg ship with high block coefficient and big B/T, lacking references so far, numerical simulation for viscous flow is a tough task, especially in the grid generation and corresponding numerical treatment near the stern.

经过二十多年的的研究，双尾船的设计与开发已取得了长足的进展。本文依托于交通部西部开发办的&赤水河航运新船型研究&项目，对该研究项目设计的双尾船进行粘性流场的数值模拟。

The one-dimensional complete hydrodynamic model for border irrigation based on the hybrid numerical method can obviously increase computational stability and convergence, and effectively improve computational precision and efficiency, and provide a good numerical simulation tool for the design of border irrigation system and performance evaluation.

基于混合数值解法的一维畦灌全水动力学数值模拟方法可明显增强数值计算的稳定性和收敛性，有效提高了计算精度和效率，为开展畦灌系统设计与性能评价提供了可靠的数值模拟手段。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。