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三维弹性波
相关语句
  3-d elastic wave
     A PARALLEL ALGORITHM WITH FINITE ELEMENT FOR SOLVING 3-D ELASTIC WAVE EQUATIONS
     有限元解三维弹性波方程的并行算法
短句来源
     Absorption boundary for the finite-element modeling of the 3-D elastic wave
     三维弹性波有限元模拟的吸收边界
短句来源
     The finite element modelling of 3-D elastic wave implemented in microcomputer
     三维弹性波有限元模拟在微机上的实现
短句来源
     Here, we use second-order, tempo- ral- and high-order spatial finite-difference formulations with a staggered grid for discretization of the 3-D elastic wave equations of motion. The set of absorbing boundary conditions based on paraxial approximations of 3-D elastic wave equations are applied to the numerical boundaries.
     采用时间上二阶、空间上高阶近似的交错网格高阶差分公式求解三维弹性波位移-应力方程,并在计算边界处应用基于傍轴近似法得到的三维弹性波方程吸收边界条件。
短句来源
  3 d elastic wave
     In this paper, on the base of paraxial approximations, we present a set of absorbing boundary conditions of 3D elastic wave equations and apply to the 3D elastic wave numerical modeling in isotropic medium.
     本文基于傍轴近似法提出了计算三维弹性波方程的吸收边界条件公式 ,表示了各边界面、边棱和角点处波场所满足的单程波方程 ,并在三维弹性波数值模拟中进行了应用 .
短句来源
  “三维弹性波”译为未确定词的双语例句
     According to the Born approximation solution of the scattering of three-dimensional elastic waves,the scattering from an ellipse void in a long Al rod is analyzed comparatively.
     在三维弹性波散射问题的Born近似解基础上,进一步分析了在纵波入射条件下二维散射问题的Born近似解,对铝质长杆中的椭圆形空穴缺陷的散射场情况进行了对比分析;
短句来源
     THE PARTIAL SEPARATION OF VARIABLES-FRACTIONAL STEPS DIFFERENCE METHOD FOR SOLVING 3-DIMENSIONAL ELASTIC WAVE FIELD IN CYLINDRICAL COORDINATE SYSTEM
     柱坐标系下求解三维弹性波场的部分分离变量-分步差分方法
短句来源
     On Scattering Inversion of a Three-Dimensional Elastic Wave Equation
     三维弹性波场的线性化逆散射问题
短句来源
     With weak scattering assumed,a theoretical approach to the scattering inversion of elas-tic wave in the solid with Born approximation is proposed.
     在弱散射假设下,建立了三维弹性波多参数反演的理论方法。
短句来源
     At first, 2D elastic wavefield in a multilayered medium is extended to 3D space, and the propagation of elastic wave is studied in the frequency domain.
     首先,我们将层状介质中的传递矩阵理论从二维推向三维空间,在频率域研究了任意面源激发的三维弹性波理论问题。
短句来源
  相似匹配句对
     THREE-DIMENSIONAL FINITE ELEMENT MODELLING OF ELASTIC WAVES
     弹性三维有限元模拟
短句来源
     Absorption boundary for the finite-element modeling of the 3-D elastic wave
     三维弹性有限元模拟的吸收边界
短句来源
     The finite element modelling of 3-D elastic wave implemented in microcomputer
     三维弹性有限元模拟在微机上的实现
短句来源
     On Scattering Inversion of a Three-Dimensional Elastic Wave Equation
     三维弹性场的线性化逆散射问题
短句来源
     Elastic wave diffraction tomography
     弹性衍射CT
短句来源
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  3-d elastic wave
The numerical modeling of 3-D elastic wave equation using a high-order, staggered-grid, finite difference scheme
      
Here, we use second-order, temporal- and high-order spatial finite-difference formulations with a staggered grid for discretization of the 3-D elastic wave equations of motion.
      
The set of absorbing boundary conditions based on paraxial approximations of 3-D elastic wave equations are applied to the numerical boundaries.
      
  3 d elastic wave
2d and 3D elastic wave propagation by a pseudo-spectral domain decomposition method
      


With weak scattering assumed,a theoretical approach to the scattering inversion of elas-tic wave in the solid with Born approximation is proposed.Two orthogonal illuminants ofwide-band plane waves,i.e., the P, SV , and SH waves,are used to illuminate an objec-tive, and the scattering data on the closed surface of measuremnt encircling the objectivehave been collected as a function of time, By calculating the plane-wave scattering ampli-tudes from the data and by choosing proper polarization of the incident S-waves,...

With weak scattering assumed,a theoretical approach to the scattering inversion of elas-tic wave in the solid with Born approximation is proposed.Two orthogonal illuminants ofwide-band plane waves,i.e., the P, SV , and SH waves,are used to illuminate an objec-tive, and the scattering data on the closed surface of measuremnt encircling the objectivehave been collected as a function of time, By calculating the plane-wave scattering ampli-tudes from the data and by choosing proper polarization of the incident S-waves, the un-known mass density and elastic parameters in wave-number space can be decoupled in Fouri-er transform domain, The inversion results obtained are in a form of filtered back-projectionbut with a weighting factor.

在弱散射假设下,建立了三维弹性波多参数反演的理论方法。采用两束相互垂直的宽带平面波照射目标体,在包围目标体的封闭测量面上获取散射玻场,通过计算“平面波散射振幅”并选择适当的偏振方向将未知参数在富立叶变换域内解耦.所得结果类似于X射线CT成像,具有“滤波反投影”的形式。

In order to deal with large computer storage and long time of calculation in the finite element modelling of 3-D elastic wave, we used a particular segment method and the bandwidth compact storage method of the upper semi-band of stiffness matrix. Simultaneously, we make use of the central mass matrix and the explicit formula of center time difference. Using these methods to save computer storage and increase calculation speed, the finite clement modelling of 3-D elastic wave is implemented in micro-computer....

In order to deal with large computer storage and long time of calculation in the finite element modelling of 3-D elastic wave, we used a particular segment method and the bandwidth compact storage method of the upper semi-band of stiffness matrix. Simultaneously, we make use of the central mass matrix and the explicit formula of center time difference. Using these methods to save computer storage and increase calculation speed, the finite clement modelling of 3-D elastic wave is implemented in micro-computer. The correctness and efficiency of this algorithm is proved by the results of theoretical modelling.

针对三维弹性波有限元模拟要求计算机内存大和计算时间长的困难,本文采用一种特殊剖分法和刚度矩阵的上半带等带宽压缩存贮法,并采用集中质量矩阵和中心差分时间积分显格式的结合,极大地节省了内存,提高了运算速度,在微机上实现了三维弹性波有限元模拟的计算。理论模型的试算验证了算法的正确性和可行性。

The absorbing boundary conditions to avoid the artificial boundary reflections must be required in the numerical simulation of seismic wave propagation. In this paper, on the base of paraxial approximations, we present a set of absorbing boundary conditions of 3D elastic wave equations and apply to the 3D elastic wave numerical modeling in isotropic medium. The snapshots of the theoretical and salt model show that they reduce artificial reflections to a great extent and absorb energy over a wide range of incident...

The absorbing boundary conditions to avoid the artificial boundary reflections must be required in the numerical simulation of seismic wave propagation. In this paper, on the base of paraxial approximations, we present a set of absorbing boundary conditions of 3D elastic wave equations and apply to the 3D elastic wave numerical modeling in isotropic medium. The snapshots of the theoretical and salt model show that they reduce artificial reflections to a great extent and absorb energy over a wide range of incident angles. Since using forth order approximations, they save computer storage and are convenient to implement.

在地震波传播数值模拟的过程中 ,需要使用吸收边界条件从而达到衰减人为边界反射的目的 .本文基于傍轴近似法提出了计算三维弹性波方程的吸收边界条件公式 ,表示了各边界面、边棱和角点处波场所满足的单程波方程 ,并在三维弹性波数值模拟中进行了应用 .理论模型及三维盐丘地质模型波场切片快照试算结果表明 ,该吸收边界条件可以有效地吸收人为边界反射 ,适用于较大入射角情况 ,从而消除了边界有效波信息的干扰 .由于采用四阶近似方程 ,在保证计算精度的前提下 ,该方法具有节省计算工作量和易于实现的特点

 
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