波动方程

The finite element numerical method based on centimo theory and dispart-insert-value One side ,it is conventional energy method. It is transfiguration of Ritz-Galerkin method .

在求解非线性波动方程时，有限元方法通过剖分插值构造有限维子空间SN的基函数的方法保持了古典Ritz-Galerkin方法的优点，克服了它的不足。

Absorbing boundary condition ; wave equation ; spectral element ; central difference method

吸收边界条件；波动方程；谱元；中心差分法

At the same time , we analyses the effect of the air speed on the property of silencer on real condition and modify the wave equation and the boundary condition.

同时，根据实际情况分析了气流对消声器特性的影响，对波动方程及其边界条件进行了修正。

In the thesis, the fundamental formula of FFD method derives from the square root that is approximated by a continued fraction expansion in the one-way wave equation. Optimizations of the parameters of the finite-difference operator improve the validity of the method.

本论文用连分式近似单程波波动方程中的平方根导出FFD算法的基本公式，并对FFD算法中的有限差分算子进行了系数优化，进一步提高了计算的有效性。

Using the method of convolution model and wave equation numerical simulation, This paper systematically studied several kinds of typical geologic bodies.

4利用褶积模型和波动方程数值模拟方法对几种典型的地质体进行了系统的模拟研究。

The standing wave representation of the same formula is shown to be covariant and physical.

证明了球面波的驻波表示是协变的，因而是一个物理的关系式，故适用于圆柱坐标中各类波动方程的定解问题。

We propose a wave equation based migration scheme for imaging the steep dipping structures with 3D sparsely sampling dataset, especially sparsely sampled in the crossline direction.

针对稀疏采样，特别是crossline方向稀疏采样的三维地震数据，提出了一个基于波动方程方法的陡角度构造深度偏移成像方法。

The methods for treatment of earthquake input and modeling of radiation damping in infinite foundation were established based on cylindrical wave equation.

其中，地震波的输入方法以及无限地基辐射阻尼的模拟方法都是在柱面波动方程的基础上建立起来的。

In this paper, the method of wave field extrapolation and decomposition of seismic compound wave in viscoeleastic medium is presented, based on wave equation.

从粘弹性波动方程出发，建立了一种地震散射波场纵横向高分辨波场外推方法。

So we say that we can absolutely avoid unnecessary and bothering process in mathematic deducibility if making full use of the method of Pseudo-spectral in more complex viscoelastic media, we can get wave equation when directly replacing with two kinds of relaxation modules.

由此可以说，如果采用伪谱法模拟其它更复杂的粘弹介质模型时，完全可以避免不必要的而且烦杂的数学推导过程；直接将体积松弛模量和剪切松弛模量代入即可得其波动方程。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。