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the central difference
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  中心差分
     1. On detailed study of the central difference finite volume method proposed by Jameson, discrete formulae of 3-D Euler equations and N-S equations are presented.
     1.详细研究了Jameson的中心差分有限体积法,推导了Euler方程和N-S方程的空间和时间离散公式。
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     Replacing the central difference operator with finite first order difference operator (Crank-Nicolson), we can get 45° one-way wave equation in unconditionally stable difference scheme.
     本文在该方程中进一步引入了Crank-Nicolson一阶有限差分算子来代替中心差分算子,从而得出了45°无条件稳定差分格式的单行波方程。
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     Based on Hamilton's principle, the equations of motion and boundary conditions are obtained. By using the central difference method, the response of the structure with different vortex-shedding loads is obtained.
     本文采用了后一种柔性模型,根据哈密顿原理建立结构的运动方程和边界条件,运用中心差分法得到结构受到不同的涡旋脱落荷载作用下的响应,主要工作可以概括为:
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     In view of that there exist some defects when the Extend Kalman Filter(EKF) is employed in the vehicle integrated navigation,the Central Difference Filter(CDKF) as a new nonlinear filtering method is applied to the nonlinear state estimation of the vehicle integrated GPS/DR navigation systems.
     针对扩展卡尔曼滤波(EKF)在车辆导航中存在着计算复杂、线性化误差大等缺点,将一种新的非线性滤波方法———中心差分卡尔曼滤波(CDKF)用于车辆GPS/DR组合导航中。
短句来源
     If we heighten the precision of measuring equipment, the central difference's relative error of the estimation variance improved great, which is less than 10%.
     若提高测量仪表精度,则中心差分法估计方差相对值明显改善,可提高到10%以内.
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  中心差
     By using the central difference quotient operator for  2x 2 and the diagonal Padé approximation of exp t , two kinds of symplectic schemes which have accuracy O( Δ x 2+ Δ t 2l ) and O( Δ x 4+ Δ t 2l ) , respectively, can be attained for wave partial differential equation.
     对 2x2 利用中心差商算子 ,对expt作对角Pad啨逼近 ,由波动偏微分方程可得到两类具有O(Δx2 +Δt2l)和O(Δx4+Δt2l)精度的辛格式 .
短句来源
     In order to resolve the Navier-Stokes equations and Spalart-Allmaras one-equation turbulence model, the central difference scheme by Jameson and local time stepping method were employed.
     计算中采用Jameson的中心差分格式使用全局时间推进方法求解N S方程和Spalart Allmaras一方程湍流模型。
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     The central difference schemes JST and SLIP that satisfy LED principle are used.
     计算中采用了具有当地极值递减(LED)性质的JST和SLIP中心差分格式。
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     The central difference scheme of Jameson and one-equation turbulence model of Spalart-Allmaras were used to resolve the Naviers Stokes equation.
     模拟过程中应用Jameson中心差分格式,结合Spalart-Allmaras一方程湍流模型,使用时间推进法求解雷诺平均N-S方程。
     The central difference scheme of Jameson and algebraic turbulence model of Baldwin-Lomax are used . Detailed flow structures and parameters are showed.
     计算中采用Jameson的中心差分格式结合Baldwein-Lomax湍流模型求解雷诺平均N-S方程,得到了三维复杂流场中气体参数分布的详细结构和规律,具有较高的精度。
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  “the central difference”译为未确定词的双语例句
     (2)With the reduction of therectangular niesh, the scheme will be reduced to the central difference formula automatically.
     (2)能随网格的退化而自动退化为高阶中心格式;
短句来源
     By resolving the differential operator for the wave equation in Generalized Orthogonal Coordi-nates(GOC),two unidirectional wave equations are ohtained,and by using the central difference approximate method,Mur's absorbing boundary condition of second order in GOC is presented in this paper. The results are compared with those in orthogonal and cylinder coordinates.
     本文由广义正变坐标系下的波动方程,通过微分算子的分解得到了两个单向波方程,利用差分近似方法得到广义正交坐标系下Mur二阶吸收边界条件,并与文献给出的直角和圆柱坐标系下的Mur二阶吸收边界条件进行了对比和补充.
短句来源
     Their propagation in pseudodynamic test is investigated with the central difference method as an example, and then discussions about the computed results are performed.
     以中央差分法为例研究了下冲误差在拟动力试验过程中的传播特性 ,并通过理论推导对结果进行了讨论
短句来源
     Based on the central difference method,the displacement control method of starting stage by x__-1,x__1 is analyzed.
     文章对采用中央差分法进行的拟动力试验过程控制,分析了x-1、x1等几种起步试验位移控制方法。
短句来源
     Firstly,RGB color space is transformed into LUV color space,and the central difference of luminance is calculated to estimate the normal.
     首先把原始的RGB色彩空间转换成LUV色彩空间;
短句来源
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  the central difference
The limits of maximum stable velocity are obtained around 0.39, 0.43, and 0.43 for the central difference, for the explicit upwind difference, and for the semi-implicit upwind difference schemes, respectively.
      
As the BGK relaxation time is increased at constant CFL number, the stability of the central difference LB scheme may not be ensured.
      
Indeed, this is said to be the central difference between those true beliefs that qualify as knowledge and those that are true merely by luck-the former, unlike the latter, are achievements of the subject and are thereby creditable to her.
      
On equidistant and variable sized rectangular grids we choose limited κ= related schemes to approximate the advective flux and the central difference scheme for the diffusive flux.
      
Then, the finite element method with lumped mass and the central difference method are incorporated to establish 2D wave motion equations, which can be transformed into 1D equations by discretization principle and explicit finite element method.
      
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The new method for instrument correction of RDZl-12-66 strong-motion pendulum galvanometer system is presented. In the procedure of differentiation and integration, one term of the correction involves digital differentiation where the central-difference method is replaced by a new differentiation transfer formula accurate up to frequency of 45 HZ for data equally spaced at 100 points/ second. Another term of the correction involves digital integration followed by a baseline correction of thei ntegrated...

The new method for instrument correction of RDZl-12-66 strong-motion pendulum galvanometer system is presented. In the procedure of differentiation and integration, one term of the correction involves digital differentiation where the central-difference method is replaced by a new differentiation transfer formula accurate up to frequency of 45 HZ for data equally spaced at 100 points/ second. Another term of the correction involves digital integration followed by a baseline correction of thei ntegrated displacement data to avoid long period errors. The processing result shows that the method is more effective for instrument correcting, keeping valuable high frequency components in record and eliminating long period error which comes from the uncertainty of initial displacement and integration calculation.

本文对中国制造的电流计记录式加速度仪RDZ1-12-66记录的振幅失真校正方法进行了改进,针对微分-积分运算过程,提出:第一,用一种新的微分变换公式代替目前通用的中心差分法,对于采样率为100点/秒的等间距离散化加速度记录,校正频率可以高达45赫兹,并具有较高的精确度;第二,在进行仪器失真校正运算之前,对积分所得位移数据先进行一次基线修正,消除长周期误差对仪器修正计算的影响。实际处理结果表明,该方法能更有效地校正仪器的失真和充分保留记录中有价值的高频分量。

This paper mainly describes how to get the numerical solution of the scalar wave equation by finite element method. The processing programs used are suitable for the inhomogeneous media, in which the wave velo- city varies longitudinally and transversely. In arder to simplify the procedure of the calculation and save the time needed for computing, instead of the 3-D space, the 2-D space is adopted. The whole work was completed by the computer of model IRIs-60 with the Galerkins method,the triangular elements...

This paper mainly describes how to get the numerical solution of the scalar wave equation by finite element method. The processing programs used are suitable for the inhomogeneous media, in which the wave velo- city varies longitudinally and transversely. In arder to simplify the procedure of the calculation and save the time needed for computing, instead of the 3-D space, the 2-D space is adopted. The whole work was completed by the computer of model IRIs-60 with the Galerkins method,the triangular elements as well as the central difference scheme were adopted. Results show no difference to the physical models,they are in conformity with each other very well.

本文研究用有限元法求标量波动方程的数值解。相应的处理程序适用于非均匀介质中波的传播。也就是说,波在介质中的传播速度不仅在纵向上有变化,而且在横向上也有变化。为了减少计算时间,可以用二维空间来简化三维空间。计算中应用了Galerkin法、三角形单元和中心差分格式。计算是在IRIS—60机上进行的。计算结果与物理模型一致。

The propagating enclosure method is proposed in dynamic analysis using the finite element method. In this technique the position of the artificial boundary enclosing the computational model is not fixed but propagates forward and backward along with the wave front, in order to prevent the contamination of the solutions from spurious reflected waves. The method is simple and efficient. A recursion formula to calculate the effective load at the boundary is presented. The appropriate selections of the moving interval,...

The propagating enclosure method is proposed in dynamic analysis using the finite element method. In this technique the position of the artificial boundary enclosing the computational model is not fixed but propagates forward and backward along with the wave front, in order to prevent the contamination of the solutions from spurious reflected waves. The method is simple and efficient. A recursion formula to calculate the effective load at the boundary is presented. The appropriate selections of the moving interval, truncation error and the point of onset is to minimize the computer storage and the number of operations required. For a layered model the computational procedure for the central difference method of direct integration is very simple and easy. This method is applicable in direct integration schemes and finite difference analysis. The limitation of the method is that it requires a larger computer storage.

本文就波动问题提出一种移动边界的有限单元解法。此时模型边界的位置不是固定的,它将随着波前向前推进和退回,以保证在计算时间长度内边界反射波不到达观测点。文中给出了计算边界有效载荷的递推公式,可以简便有效地避免虚假反射波的干扰。为降低运算量和虚模型中的存贮,应适当选取移动间隔,截断误差和移动起点。对于层状模型,若采用直接积分的中心差分方法,计算过程十分简单,也可用于有限差分等方法的计算中。该方法在应用上的限制是对计算机内存量的要求较通常方法为大。

 
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