数值算法

Numerical simulation signal and vibration acceleration signal of a roughing mill main drive speed reduction unit have been decomposed by using empirical mode decomposition algorithm; each component has been carried on spectral analysis.

摘要运用经验模式分解算法对数值仿真信号及某轧钢厂粗轧机主传动减速机振动加速度信号进行了分解，从而得到若干个基本模式分量，对每个模式分量进行了频谱分析。

In this paper, numerical calculations of magnetically induced twist effect in planar nematic liquid crystal are presented. The transmission of polarized light passing through magnetically induced twist distribution in planar nematic liquid crystal is calculated with "4-4" matrix algorithm. On the experimental side, the optical phase retardation method is used to detect the magnetically induced twist effect in planar nematic liquid crystal 5CB(4′-n-penty1-4-cyanobiphenyl) at 27℃.

对平行排列5CB(4′-n-penty1-4-cyanobinpheny1)丝状液晶在静磁场中扭曲变形做了严格的数值解，给出了严格分布情况；利用光学&4*4&矩阵算法，计算了线偏振光在严格分布下的传输情况；在实验方面，应用光学相位延迟法对平行排列5CB丝状液晶在静磁场中(温度27℃)线偏振光的通过情况进行了测量。

The real data verification shows that the wavelet, reflection factor and acoustic impedance given by PCGA are more accurate, quicker convergent and value stable than the existing direct sparse inversion method.

用实际数据检验算法，表明预条件共轭梯度法反演的子波、反射系数和波阻抗要比直接稀疏反演精度高、收敛快、数值稳定。

The results show that grooves on magnetic pole surface can change the magnetic field distribution effectively and enhance the grade of magnetic field,so the higher finishing efficiency can be obtained.

利用有限差分的方法对磁极开槽情况下磁力研磨加工区域中的磁场分布进行了数值分析，提出了一种等磁位线的计算绘制算法，得到了加工区域磁场分布的等磁位线图。

The algorithm takes advantages of wavelet analysis and homotopy inversion method. It shows high capability of global search.

算法结合小波反演和同伦反演的优点，数值结果表明其具有较强的全局搜索能力。

On the basis of it, the cascade flow field with endwall suction, the effects of suction on the different endwall locations (such as near the leading-edge, in the middle of the passage or near the suction surface) on the development of secondary flow, the distributions of total pressure loss coefficient and yaw angle are investigated respectively.

本文首先采用三维稳态时均N—S方程组的有限体积差分法及压力修正算法数值求解技术对一直列透平静叶栅通道内流动的发展进行了模拟，利用文献中的实验结果验证了计算方法与程序的适用性。

This algorithm is based on DWT method.

基于离散小波变换方法，提出了一种可用于计算三维数值模拟样本面密度的平滑算法。

In the third parts, by using high accurate methods and HPF parallel computing, the N-S equations under cylindrical coordinates are used to simulate space developing compressible axisymmetric jet.

第三部分采用高精度的差分格式求解柱坐标下的三维N—s方程，利用HPF并行算法对空间发展的可压缩轴对称射流进行直接数值模拟。

This is the numerical analysis algorithm doolittle procedures, complete with C language.

这是数值分析中doolittle算法的实现程序，用C语言完成。

The element-free Galerkin method was used for discretization of degree of freedom in space, the refinement integration method for time-domain integration, the modified variation principle to meet boundary conditions, the least-squares method for interpolating, and the Romberg algorithm for numerical integration.

该方法利用无网格方法进行空间自由度的离散，采用精细积分方法对时域积分，采用修正变分原理满足边界条件、最小二乘法进行插值，龙贝格算法进行数值积分。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。