compressional diffraction

The result shows that the penetration of diffraction wave rays through the low velocity zone in subsided column results in an obvious time delay, with the water filled subsided column being longer in delayed time than that of the non water filled subsided column.

通过对充水型、不充水型陷落柱地质模型的研究 ,发现绕射波的射线穿过陷落柱内的低速体产生明显的时间延迟 ,并且充水型陷落柱比不充水型陷落柱的延迟绕射波延迟时间要长 ;由延迟时间推算出陷落柱内的充填速度 ,据此来分析陷落柱的充水性 。

The portable mine detector,which is used to make advance detection of the front small structure of the mining faces by utilizing the diffracted wave,has become an effective auxiliary tool for the forecasting in the tunnelling.

便携式矿井探测仪是应用绕射波来超前探测巷道掌子面前方小构造的,在速度低于上下围岩的中等速度的特定层位中,地震波将在前方的小断层或小构造处反射,以绕射波形式返回到检波器,其最远的探测距离达184m,成为在掘进巷道中预测预报的有效辅助工具。

Two numerical examples illustrated the theoretical results, and the ellipse features of non-zero offset Fresnel zone expounded the distribution of the main energy of seismic diffracted waves quantitatively.

对水平界面和倾斜界面两种情况下的非零炮检距菲涅耳带方程进行了理论推导,给出了相应的数值算例,指出了菲涅耳带在非零炮检距情况下表现为椭圆的性质,并对非零炮检距情况下地震绕射波能量的主要分布范围做了定量阐述。

A numerical model of wave diffraction was established using infinite similar element method(ISEM),coupled with finite element method(Garlerkin),to obtain wave force on a vertical cylinder of arbitrary cross section.

采用无限相似单元方法与有限元法(Garlerk in)相结合对波浪绕射进行了数值模拟,求得任意截面柱状物体上的波浪荷载。

An analytical method was developed to study the wave diffraction effects on V-type bottom-mounted breakwaters.

给出了V形贯底式防波堤对波浪绕射计算的解析方法。

Based on the image theory, the wave diffraction from a cylinder in front of a vertical wall is transformed into the problem of diffraction of bidirectional incident waves from two cylinders.

应用映像原理,将直墙前单个圆柱对波浪的绕射问题,变换为双柱对双向波浪的绕射问题,应用速度势的特征展开方法,建立了直墙前垂直圆柱对波浪绕射的解析解。

NUMERICAL MODEL OF WAVE DIFFRACTION FOR WAVE HEIGHT WITH NYSTROM METHOD

Nystrom法计算水波绕射波高的数值模型

The wave heights behind a submerged semi-circular breakwater shall be superimposed by diffracted and transmitted wave heights.

半圆型潜堤后的波高将由绕射波高与传递波高迭加而成。

radio wave diffraction propagation over obstacles

障碍物电波绕射传播

Numerical Modeling of Combined Refraction-Diffraction and Reflection of Wave;

波浪联合折射、绕射与反射数值模拟

The Study on Radio Wave Diffraction Model of Broadcasting and Television Based on GIS;

基于GIS的广播电视电波绕射模型研究

On Watson Transformation in Diffraction Theory of Radio Waves Around the Spherical Earth

球面地电波绕射理论中的瓦特松变换问题

Computation of Wave Diffraction by 2D Obstacles Using a Scaled Boundary Finite-Element Method;

应用比例边界有限元法求解波浪对物体的绕射

The Research and Application of Combined Refraction-diffraction Wave Model Nearshore;

近岸波浪折绕射联合模型的研究与应用

Numerical Simulation of the Diffraction Detonation Wave Based on the Modified SPH Method

基于修正SPH方法的爆轰波绕射传播的数值模拟

The waves are sometimes seen clearly when reflections and discrimination are rather poorly developed.

当反射和绕射相当不发育时，这些波看上去很清楚。

Localization of Transmitter in Troposphere Environment Using Inverse Diffraction Parabolic Equation

基于逆绕射抛物方程法定位大气波导环境下的发射源

Diffraction,reflection and focusing of toroidal shock waves

环形激波绕射、反射和聚焦流场的间断有限元模拟

refraction, diffraction, and reflection of ocean waves

海浪的折射、绕射和反射

Comparisons of diffraction effects in two coastal spectral wave models

河口海岸波浪谱模型中考虑绕射效应方法的比较

Fourier diffraction projection theorem

傅里叶绕射投影原理

Diffraction ray tracing of GTD on the cone and cylinder

圆锥体与圆柱体的几何绕射理论绕射线寻迹

circulating surface acoustic wave delay line

环绕式表面声波延迟线

distress alerting band of polar-orbiting satellites

绕极卫星海难呼救波段