查询词典 numerical technique

The dynamic meshing technique was adopted to realize the 3-D transient numerical simulation of vehicle overtaking process in order to study the influence of relative velocity and absolute velocity on the aerodynamic characteristics of the overtaking and overtaken vehicles during the overtaking process.

为了研究超车过程中相对车速和绝对车速对汽车气动特性的影响，采用动网格技术实现了超车过程的三维瞬态数值模拟。

Based on the Volume of Fluid Method, the wave damping absorber of the numerical wave flume for irregular waves has been investigated. Setting the Turbulence motion equation and the Renault equation as the governing equations and using the wall function technique in the near-wall region, an absorbing wave-maker is set at the left side of the flume.

本文对基于VOF方法的不规则波数值波浪水槽进行了阻尼消波研究，以湍流运动方程一雷诺方程为控制方程，在近壁区应用壁函数技术，在数值波浪水槽的左端设置了主动吸收式造波机。

Determination of laser absorptivity of metal by numerical calculation technique and trial-and-error method .

用数值计算技术和试错法确定金属材料表面对激光的吸收率。

The sub-modeling technique of finite element analysis or FEA is studied as an alterative numerical method.

箱形结构中应力集中部位椭圆形表面裂纹区域的名义应力场分布不规则，无法使用现有的解析解和经验公式，有限元子模型法是求解此类问题的途径之一。

The computation of two-dimensional advection transport using current methods such as Alternating Direction Implicit Method and linear interpolation technique can be subject to numerical attenuation,parasite oscillation and poor reproduction of wave propagation when large time steps are used.

在概化的平面区域内，采用上述方法模拟了二维初始浓度高斯分布和水流激波在旋转速度场及均匀速度场上的对流输移问题，结果表明方法在优化幅值衰减和数值扰动以及计算效率方面具有相当的发展潜力和应用前景

Based on this, a new WENO difference scheme which based on Dispersion-Relation-Preserving relation is developed, and representative test cases with this scheme for computational aeroacoustics problems has been implemented and compared in order to test capability of wave capturing; In addition, WENO schemes generally do not converge at high order in the presence of contact discontinuity of Euler equations, so a conservative front tracking technique coupling WENO schemes and Level Set method to simulate the translating density profile is presented here, and numerical simulation with this technique for representative test case has been implemented and results show the desired accuracy.

本文研究了高阶精度加权基本无振荡格式及其在双曲守恒律方程中的应用，在此基础上作了两个方面的工作：一是针对高频声波问题构造出一种基于保色散关系的WENO有限差分格式，并对计算气动声学问题的代表性算例进行了大量数值实验，比较了该格式捕捉波数的能力；另外，针对高阶WENO格式在处理Euler方程的接触间断时精度有所降低的问题，研究了利用界面追踪技术Level Set方法和高阶激波捕捉WENO格式相结合的一种守恒追踪方法，并且给出有代表性的密度滑移面问题的算例，得到一致高阶精度的数值模拟结果。

The main research areas of this paper include:For simulation model of cyclist dummy, it is proposed that a combined custom modeling technique set up new cyclist dummy that adapts for two-wheeler collision accidents. The technique is achieved based on the analysis of modeling features of existing numerical dummy and the problems that occur when it is used to simulate the two-wheeler cyclists.

研究的主要方面包括：在两轮车骑车人仿真假人模型的研究方面，通过分析现有数值假人的建模特点和其用于对骑车人进行仿真模拟上存在的问题，根据本文研究的需要，提出组合式定制假人建模技术建立适合于两轮车碰撞事故研究的骑车人数值仿真假人。

Through the study of the style of knowledge description, the paper elaborates the numerical model knowledge, the symbolic experience knowledge and the instantial swatch knowledge. These three kinds of different knowledge have been used in loans risk classification in the paper. Just as the using of the Object Oriented technique and the AI (include ES, ANN, and the integrated of ANN and ES) technique, can the paper realize the five-grade loans risk classification.

本文通过对知识描述形式的研究，表述了经验符号性知识、模型化数量性知识和实例样本性知识三种类型，通过对其行为特征及转换、集成的研究，将这三种异构知识引入贷款风险分类分析；采用面向对象技术和人工智能的ES、ANN两种形式及其结合，实现了贷款风险五级分类。

The reconstruction problem is ill-posed, so two optimal criterions, the least module and the smoothness criterion base on Tikhonov regularization technique, are introduced into reconstruction algorithm. Many regularization parameters choice strategies are investigated, and the TPA(Two—Parameter Algorithm) strategy which is based on the Morozov discrepancy principles, is implemented in two regularization reconstruction algorithms.Numerical experiment results show that the nonnegative and smoothness constraint condition can overcome the difficulty of iteration semiconvergent, preconditioned technique can improve convergence rate and reconstruction accuracy, smoothness regularization criterion can meliorate ill-posed problem of reconstruction and enhance iteration stability, and the TPA is an effective strategy of regularization parameters choice.

数值试验表明：在共轭梯度法中引入非负约束和光滑约束改善了迭代的&半收敛&性，非负约束保证了解的非负性，光滑约束抑制了重建解的振荡现象，约束算法的重建精度与无约束算法相比大幅度提高；在约束共轭梯度重建算法中引入预优技术，可以加快算法的收敛速度，提高迭代的稳定性和重建精度；引入光滑准则的正则化技术可以有效改善图像重建问题的不适定性，加快迭代的收敛速度，提高迭代的稳定性和图像重建质量，计算正则参数的TPA算法在闪光照相图像重建中是有效的。

D net work numerical modeling technique for discontinuities of rock mass is a new technique developed recently, which can be a very important basic work to evaluate the stability and geometric parameters for engineering design in jointed rock mass.

岩体随机不连续面三维网络数值模拟技术是近年来逐步发展起来的一项新技术，该技术对坚硬块状节理化岩体的稳定性评价，及岩土工程设计几何参数的获取是一项重要的基础工作。

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。