速度函数

Firstly, based on the method of pressure-velocity coupling introduced by SIMPLE algorithm and a revised method of solving the unsteady equation of stream function and vorticity on uniform grid, a special algorithm called primitive-variable-time-dependent approach is formed in the present study. In this algorithm the Navier-Stokes equation in primitive variable form is solved by using the time-dependent approach on non-uniform staggered grid system. The second-order accuracy finite difference is used for the first and second partial derivatives of all variables of the convective terms and diffusion terms.

首先，本文在SIMPLE算法系列处理速度与压力耦合问题的思路和均匀网格下改进的关于流函数涡量方程的数值求解方法的基础上，将非定常原始变量Navier-Stokes方程的求解推广至非等距交错网格剖分，形成了具有本文特色的原始变量时间推进方法，其中对流项和扩散项中各变量的各阶导数均采用二阶精度公式，包括温度在内的离散方程组采用ADI迭代方法求解。

In view of the principle of pointbypoint comparison method, the foundation deciding whether the middle point interpolation is the control step error of NC system has been advanced, the math mould of inserting and compensation method established and the function that judges error by interpolating method has been improved.

基于逐点比较法原理，提出中点插补算法作为数控系统控制步进的偏差判别依据，建立了插补算法的数学模型，对插补算法偏差判别函数进行了改进和完善。实例分析结果表明，中点插补算法使插补精度由原来的小于等于一个脉冲当量提高到小于等于 0 。5个脉冲当量，插补点大幅度地下降，系统的响应速度加快和插补精度提高

In this paper Ply system was used to measure the probability density function and scaling law in the turbulent boundary layer of a flat plate.

利用高分辨率、高帧率PIV系统对湍流边界层中的脉动速度结构函数及标度律进行了实验研究。

In this paper the extrapolation object is the shorten polynomial but not the original signal itself. This algorithm is much easier than prolate spherical wave function expansion method.

本文采用外推截断多项式的方法对HRV信号进行外推，避免了采用长球函数外推信号运算量大的缺点，可以提高运算速度。

This method takes the advantages of fast convergence of CG and not easily to trap the local extreme of SH, which make it can converge to global extreme at a high rate of speed in solving the problems of quadratic function optimization.

这种方法结合了共轭梯度法的快速收敛和随机爬山法的全局收敛的优点，在求解二次函数极值的问题上具有收敛速度快，并能收敛到全局极值的特点。

Finish to design the micro CNC, I have to investigate the adaptable parameters for cutting. This paper had calculated tool's radius, spindle's rotational speed, radial depth, and feed speed by the instantaneous cutting areas of the cutting forces model. To find out the instantaneous cutting areas by mathematica which can calculate the tangential, radial and axial component of cutting forces during cutting.

设计完微型工具机后，接著探讨最佳的切削参数，本论文采用瞬时投影面积的数学模型，且推导出利用刀具半径、主轴转速、径向切深、进给速度等参数来做为瞬时切削投影面积的函数，并使用软体mathematica算出瞬间面积大小，预测出切削过程里所产生的切线切削力、径向切削力和轴向切削力。

Radical basis function neural networks have the powerful approximating capability, simple structure and outstandinglearning speed in comparison with other sorts of neural networks.

径向基函数神经网络具有其它前向神经网络所不具有的最佳逼近功能，并且结构简单，训练速度快。

Simulation results indicate that the proposed wavelet network in the paper has a good approximation capability, and has the advantages of rapid convergence rate and high ...

结果表明，这种新的小波网络具有良好的函数逼近能力，收敛速度快且逼近精度高。

The optimization computing of Goldstein and Price function is made to show that the new genetic algorithm has better global search capacity and rapid convergence rate.

通过对Goldstein和Price函数的优化计算，说明了该方法具有良好的全局搜索能力和较快的收敛速度。

Simulation results indicate that the proposed wavelet network in the paper has a good approximation capability, and has the advantages of rapid convergence rate and high approximation accuracy.

结果表明，这种新的小波网络具有良好的函数逼近能力，收效速度快且逼近精度高。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。