波的传播

The definition of the definition of wavelength wavelength wavelength ----: along the direction of wave propagation in the wave graph position of relative equilibrium displacement of the adjacent same time the distance between two particles.

波长的定义波长的定义----波长：沿着波的传播方向，在波的图形中相对平衡位置的位移时刻相同的相邻的两个质点之间的距离。

Week 8 - Geometrical optics, wave propagation 1 hr, in class

第八周－几何光学、波的传播

The wave propagation phenomena of the longitudinal wave in the bars,the flexural and shear waves in the beams were also analysed.

分析了杆中的纵波、Timoshenko梁中弯曲波及剪切波的传播现象。

This thesis simulates the transmittance of the ultrasonic and seismoscope in the two structure models with the transient dynamic analysis module of Ansys finite element method procedure under the sine load function of displacement.

应用Ansys有限元程序的瞬态动力分析模块模拟了数值模型在正弦载荷作用下介质内波的传播。

Test results indicate that the propagationvelocity of the elastic wave,shear modulus and coefficient of subgrade ...

实验结果表明：匀质土中弹性波的传播速度、剪切模量、地基抗压刚度系数均随土层深度增加而增大；不同性质的土层，其变化规律亦异。

The results show that the method can well simulate the propagation and interaction of stress waves and achieve good accuracy in the numerical study of spallation.

计算结果表明，光滑粒子法能很好地模拟应力波的传播和相互作用，层裂的计算结果与实验结果也比较吻合。

In Chapter 4, using Biot's theory, the characteristic of Rayleigh waves in transversely isotropic fluid-saturated porous media is researched.

在第4章中，运用Biot多孔介质理论，研究了横观各向同性液饱和多孔介质中瑞利波的传播特性。

Thus, the velocity of stress wave can be calculated.

从而可以得到应力波的传播速率。

Regarding to the Mechanical wave on Physics teaching, the traditional method usually fail to offer a direct and clear description and demonstration on the effectiveness of Mechanical wave, for this reason the MathCAD software has been adopted, with the various functions the MathCAD software offers, such as calculation, function chart drawing and cartoon designing, men can describe and demonstrate exactly how the Mechanical wave transmits, intervenes and superposes, and define and research the Doppler effect.

物理学在处理机械波的教学过程中，传统方法读其现象的描绘和演示不直观也不方便，现利用MathCAD提供的强大数值计算、函数图像创建和快速灵活的动画设计功能对机械波的传播、干涉和迭加进行了精确描述和动画演示，并对阻尼

In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

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。