数值方法

The one Presented here is used to determine the parameters of double linear softening curve of Frictious Crack Model by fitting the experimentally measused P－δ curve segmentally.

其一是提出了分段拟合实测P～δ曲线确定虚裂缝模型的双线性软化曲线参数的数值方法。

We reproduce the well-established and self-generated magnetic field equations, which are nonlinear partial differential equations.

我们证明该非线性偏微分方程具有塌缩波解，并用标准的数值方法解此方程来验证分析结果。

This paper studies the numerical methods of the temperature field and design sensitivity analysis for thermal shock problems.

本文研究热冲击问题的温度场及其设计灵敏度分析的数值方法。

A kinematic analysis theory and numerical method for shakedown analysis of periodic ductile composite materials are presented.

本文提出了在交变载荷下周期性韧性复合材料安定分析的机动理论和数值方法。

In SHET, equations which represent relation of fundamental component and preparatory eliminated harmonic components are a system of nonlinear, transcendental equations that require the interative Newton-Raphson matrix method for its solution, and convergence in solution depends on whether or not starting value given is right.

特定消谐技术中，表征基波及各次谐波幅值与开关角关系的方程组为非线性超越方程组，一般只能采用牛顿迭代法等数值方法求解，而解的收敛性取决于所给初值的正确与否。

The shortest confidence interval of parameter of Gamma distribution is in practice a question of conditional extremum. It can be transferred to a group of equations that can be solved by a method of numerical value.

Γ分布中未知参数θ的最短置信区间实际上是一个条件极值问题，它能转化成一个方程组可用数值方法迭代求解。

In this paper, a new singular element about three dimensional cracks was formed and a new method to compute 3-D stress intensity factors was proposed.

构造了一种新的三维奇异单元，提出了一种有效计算三维裂纹应力强度因子新的数值方法。

The examples given have proved the advantage of the Boundary Element Method. In the analysis of the fracture mechanics using Boundary Element Method, the calculation model of one-quarter singular element has been established, and has been proved its validity.

把边界元法应用于线弹性结构断裂分析中，建立了裂尖奇异区分析的四分之一奇异元计算模型，算例表明，用四分之一奇异元分析断裂力学问题是一种有效的逼近裂尖场的数值方法。

SFBEM not only retains the advantages of boundary element method, but also avoids solving singular integral equations.

样条虚边界元法是针对传统问接奇异边界元法存在的问题而提出的一种半解析半数值方法。

The major implementations of the developed model include: Pseudo-spectral and finite-difference schemes are employed to approximate the spatial-differential operators in the horizontal and vertical directions, respectively. A second-order Runge-Kutta method is adopted to integrate in time for the velocity field and the free-surface elevation. The solenoidal condition of the velocity field is satisfied by solving the transformed pressure Poisson equation. A modified secant method is used to accelerate the iterative solution of the non-separable Poisson equation.

模式的主要数值方法包括：分别以拟频谱法以及二阶有限差分法近似控制方程与边界条件中的水平与垂直导数；以二阶Runge-Kutta法进行非稳态的自由液面位移与流场速度的时间积分；利用改良式割线叠代法求解计算区间中不可分离的压力Poisson方程式，以满足不可压缩流条件。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐