数值计算

A non-singular single integral mathematical model is adopted to calculate the external intermittent and alternative longitudinal magnetic field acquired by single axisymmetrical and cylindrical hollow coil t which is coaxial to electrode and excitated by a revisable pulsed current of square wave t in austenitic stainless steel GTA welding.

针对奥氏体不锈钢外加纵向磁场的气体保护钨极电弧焊接时，与电极同轴的单个轴对称空心圆柱线圈在双向脉冲矩形励磁电流作用下产生的间歇交变纵向磁场，采用无暇点单积分磁场的数学模型，对＊TAW焊接外加间歇交变纵向磁场进行了数值计算，该方法具有模型简单、计算速度快和精度高等优点并讨论了该间隙交变纵向磁场的分布、磁场的均匀性及其纵向分量与径向分量的比率等规律及其对焊接行为的影响，认为横磁分量将削弱GTAW外加纵向磁场的有利作用，影响磁控电弧的焊接质量

Level set method introduced by Osher and Sethian is a numerical method, which translates the problem of evolution of 2-D (3-D) close curve into the evolution of level set function in the space with higher dimension. Level set is an accurate and steady algorithm; it can treat with the change of topology naturally.

水平集方法是由Osher和Sethian提出的一种数值计算方法，它将二维的闭合曲线的演化问题转化为高维空间中水平集函数曲面演化的隐含方式来求解，具有拓扑结构可自然变化、计算精度高、算法稳定的特点。

Afterthat,the quantum localization length was studied for to understand 1D-KBM'squantum diffusion characteristic and a critical value kb for 1D-KBM to diffusein global phase space like the classical case was obtained,which was partlyverified by further numerical computations.

在这之后，为了理解该模型的量子扩散特性，我们讨论了一维台球模型的量子局域化长度，计算出了其能够在全相空间中作半经典扩散的临界参数kb，并通过数值计算部分验证了kb的存在。

Firstly, a formula is presented in this paper, for theultimate strength of T-shaped unstiffened CHS-RHS joint under out-plane bendingload. The yield line model based on flexural failure of the chord face, is assumed onthe basis of Von-Mises stress distribution on the chord face.

本论文在有限元数值计算基础上，根据主管表面的应力分布，假定了基于弦杆表面塑性破坏模式下的节点屈服线模型，推导了平面外弯矩作用下非加劲节点的极限承载力公式，与有限元计算结果非常接近。

The two-dimensional flow field calculation software is developed by simple numerical method for determining the velocity distribution in the modul of MPC system.

本研究中，应用Simple数值计算方法开发了求解MPC系统模块结构中二维流场分布的计算软件。

The numerical results are compared with experiment results, it is verified that contribution of the ablated nozzle materials to the over-rise of pressure in pressure chamber can not be neglected. The model which takes the ablation effect into account is proved to be valid.

通过将考虑和不考虑烧蚀效应的数学模型数值计算所得的计算结果与试验结果相对比，说明了喷口烧蚀对上游压力升高的贡献不可忽略，并验证了考虑烧蚀效应电弧数学模型的正确性。

By the use of CAD method to carry out the research on key problems of three ring typed less teeth difference reducer-the inner and outer gears have to be designed by adopting modified transmission was advanced. And to study a method for carrying out numerical calculation by adopting the powerful functioned mathematical software MATHCAD in the solution of coincidence extent on less teeth differenced internal messing and in iterative computation for equation set of interference coefficient of tooth profile overlapping.

提出用CAD法研究三环式少齿差减速器设计的关键问题―内外齿轮必须采用变位传动的设计，并研究在求解少齿差内啮合的重合度和齿廓重叠干涉系数方程组的迭代计算中，选用功能强大的数学软件MATHCAD进行数值计算的方法。

Using the FLUENT software of fluid dynamics computation,the water heights around these different angles of groins was computed. The characteristics of the variation and the general rules were summarized,which could provide the theoretical supports for the skill of Slalom Kayaking.

运用计算流体力学FLUENT软件，对4种挑角的丁坝附近水流场的水位进行了数值计算，总结速度的变化特点和一般规律，为皮划艇激流回旋运动技术提供理论上的支持，为运动员改进和完善运动技术提供科学依据。

Some typical torsion problems of a cylinder involving a straight,kinked or curvilinear crack were calculated.The obtained results for the case of straight crack...

对圆弧裂纹、曲折裂纹以及直线裂纹的典型问题进行了数值计算，并与用Gauss_Chebyshev求积法计算的直裂纹情形结果进行了比较，证明了方法的有效性和正确性。

A software for calculating the critical load of scuffing has been compiled and numerical solutions have been obtained.

作者编制了表面胶合失效临界载荷的计算软件，并进行了数值计算。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新