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应力波 2

消失波 2

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一维应力波 1

主动源面波 1

传播与演化 1

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Experimental verification of the interface wave method to detect interlaminar damage of a metal multilayer structure

Bing LI,Xu GENG,Tong LU,Lei QIANG,Minghang LI

《机械工程前沿（英文）》 2015年第10卷第4期页码 380-391 doi: 10.1007/s11465-015-0365-7

摘要：

The interface wave traveling along the boundary of two materials has been studied for nearly a century. However, experiments, engineering applications, and interface wave applications to the non-destructive inspection of interlaminar composite have developed slowly. In this research, an experiment that applies Stoneley waves (a type of interfacial wave between two solid half-spaces) is implemented to detect the damage in a multilayer structure. The feasibility of this method is also verified. First, the wave velocity and wave structure of Stoneley waves at a perfectly bonded aluminum-steel interface are obtained by solving the Stoneley wave dispersion equation of two elastic half-spaces. Thereafter, an experiment is conducted to measure the Stoneley wave velocity of an aluminum-steel laminated beam and to locate interlaminar cracks by referring to the Stoneley wave velocity and echo wave time. Results indicate that the location error is less than 2%. Therefore, Stoneley waves show great potential as a non-destructive inspection method of a multilayer structure.

关键词： crack localization interface waves Stoneley waves interlaminar damage multilayer structure

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A Stoneley wave method to detect interlaminar damage of metal layer composite pipe

Bing LI,Lei QIANG,Tong LU,Xu GENG,Minghang LI

《机械工程前沿（英文）》 2015年第10卷第1期页码 89-94 doi: 10.1007/s11465-015-0323-4

摘要：

The interlaminar defect is a major form of damage in metal layer composite pipes which are widely used in petroleum and chemical industry. In this paper, a Stoneley wave method is presented to detect interlaminar damage in laminated pipe structure. Stoneley wave possesses some good characteristics, such as high energy and large displacement at the interface and non-dispersive in the high-frequency, so the sensitivity of detecting interlaminar damage can be improved and the higher frequency can be used in damage detection compared with Lamb waves. Additionally, as the frequency increases, the wavelength of the Stoneley wave reduces. Thus, its ability to detect small defects at the interface is enhanced. Finite element model of metal layer composite pipe with interlaminar damage is used to simulate wave propagation of Lamb waves and Stoneley wave, respectively. The damage location is calculated by using the Stoneley wave signal obtained from finite element model, and then the results are compared with the actual damage locations. The simulation examples demonstrate that the Stoneley wave method can better identify the interlaminar damage in laminated pipe structure compared with Lamb waves.

关键词： Stoneley wave interlaminar damage metal laminated pipe

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A numerical framework for underground structures in layered ground under inclined P-SV waves using stiffness

《结构与土木工程前沿（英文）》 2023年第17卷第1期页码 10-24 doi: 10.1007/s11709-022-0904-3

摘要： A numerical framework was proposed for the seismic analysis of underground structures in layered ground under inclined P-SV waves. The free-field responses are first obtained using the stiffness matrix method based on plane-wave assumptions. Then, the domain reduction method was employed to reproduce the wavefield in the numerical model of the soil–structure system. The proposed numerical framework was verified by providing comparisons with analytical solutions for cases involving free-field responses of homogeneous ground, layered ground, and pressure-dependent heterogeneous ground, as well as for an example of a soil–structure interaction simulation. Compared with the viscous and viscous-spring boundary methods adopted in previous studies, the proposed framework exhibits the advantage of incorporating oblique incident waves in a nonlinear heterogeneous ground. Numerical results show that SV-waves are more destructive to underground structures than P-waves, and the responses of underground structures are significantly affected by the incident angles.

关键词： underground structures seismic response stiffness matrix method domain reduction method P-SV waves

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Ribbon bridge in waves based on hydroelasticity theory

Cong WANG, Shixiao FU, Weicheng CUI

《结构与土木工程前沿（英文）》 2009年第3卷第1期页码 57-62 doi: 10.1007/s11709-009-0005-6

摘要： For the design and operation of a floating bridge, the understanding of its hydroelastic behavior in waves is of great importance. This paper investigated the hydroelastic performances of a ribbon bridge under wave action. A brief introduction on the estimation of dynamic responses of the floating bridge and the comparisons between the experiments and estimation were presented. Based on the 3D hydroelasticity theory, the hydroelastic behavior of the ribbon bridge modeled by finite element method (FEM) was analyzed by employing the mode superposition method. And the relevant comparisons between the numerical results and experimental data obtained from one tenth scale elastic model test in the ocean basin were made. It is found that the present method is applicable and adaptable for predicting the hydroelastic response of the floating bridge in waves.

关键词： hydroelasticity ribbon bridge wave finite element method (FEM)

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非均质岩体中一维应力波演化过程分析

钟光复,王志亮,李永池

《中国工程科学》 2006年第8卷第5期页码 58-62

摘要：

地下球形药包爆轰后将产生很强的地震波，其传播受到多种因素的影响。把岩石介质的弹塑性帽盖模型耦合到有限差分法程序中，对一维爆轰波在非均质岩石体中的传播、演化机理进行了数值模拟与分析；着重探讨了一维应力波从“硬”岩石层进入“软”岩石层、从“软”岩石层进入“硬”岩石层时，波在形状和强度等方面的变化规律；同时探讨了岩石介质中存在的“软弱夹层”对一维应力波传播的影响。

关键词：岩石介质一维应力波帽盖模型传播与演化

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Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-based

《结构与土木工程前沿（英文）》 2022年第16卷第12期页码 1530-1551 doi: 10.1007/s11709-022-0900-7

摘要： The seismic analysis of a viscoelastic half-space under two-dimensional (2D) oblique incident waves is carried out by the finite/infinite element method (FIEM). First, the frequency-domain exact solutions for the displacements and stresses of the free field are derived in general form for arbitrary incident P and SV waves. With the present formulation, no distinction needs to be made for SV waves with over-critical incident angles that make the reflected P waves disappear, while no critical angle exists for P waves. Next, the equivalent seismic forces of the earthquake (Taft Earthquake 1952) imposed on the near-field boundary are generated by combining the solutions for unit ground accelerations with the earthquake spectrum. Based on the asymmetric finite/infinite element model, the frequency-domain motion equations for seismic analysis are presented with the key parameters selected. The results obtained in frequency and time domain are verified against those of Wolf’s, Luco and de Barros’ and for inversely computed ground motions. The parametric study indicated that distinct phase difference exists between the horizontal and vertical responses for SV waves with over-critical incident angles, but not for under-critical incident angles. Other observations were also made for the numerical results inside the text.

关键词： oblique incident waves critical angle half-space finite/infinite element approach seismic response analysis

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Propagation characteristics of transient waves in low-strain integrity testing on cast-in-situ concrete

Hanlong LIU, Xuanming DING

《结构与土木工程前沿（英文）》 2009年第3卷第2期页码 240-240 doi: 10.1007/s11709-009-0100-8

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利用人工源超低频电磁波监测地震的试验与分析

赵国泽,陆建勋

《中国工程科学》 2003年第5卷第10期页码 27-33

摘要：

由人工产生大功率超低频（SLF）电磁波可以在地面很大范围的许多测点同时测量该信号，利用它可以研究地下电阻率结构和空间电磁场；研究地震等引起的电磁场异常变化；探测地壳结构和地下资源，具有广阔的应用前景和发展潜力。在北京等地区的观测表明,SLF信号的功率谱密度超过天然场源信号数倍以上，所得到的视电阻率数据精度远高于天然源方法，并有长时间的稳定性。在试验测量期间距测点约120 km发生的迁安4.2级地震与观测的电磁场异常和视电阻率的变化有较好的对应性,对产生这些变化的可能的成因机制进行了分析和探讨。

关键词：超低频/极低频电磁波电磁异常电阻率地震监测

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波粒二象性理论的若干问题

黄志洵

《中国工程科学》 2002年第4卷第1期页码 54-63

摘要：

论述了光波和物质波的波粒二象性理论的发展，讨论了该理论的存留问题。认为光子的静质量和光子的内部结构仍是科学中的关键性疑点。指出，虽然波粒二象性成立的前提是波长足够小，但在现有理论中却提不出一条清晰的界线。讨论了光波和电磁波是物质还是物质属性的问题。提出了对de Broglie波超光速相速的疑问。分析表明，如何建立电磁脉冲的粒子形象的问题仍需解决。此外，探讨了当电磁脉冲以超光速传播时相对论是否受破坏。最后，讨论了消失波的粒子性和虚光子问题。

关键词：光子光波物质波波粒二象性孤子电磁脉冲超光速消失波虚光子

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Numerical simulations of morphological changes in barrier islands induced by storm surges and waves using

Soumendra Nath KUIRY, Yan DING, Sam S Y WANG

《结构与土木工程前沿（英文）》 2014年第8卷第1期页码 57-68 doi: 10.1007/s11709-014-0235-0

摘要： In this paper, an advanced explicit finite volume flow model in two-dimensions is presented for simulating supercritical coastal flows and morphological changes in a tidal/coastal inlet and barrier islands due to storm surges and waves. This flow model is coupled with existing wave-action model and sediment transport model. The resulting integrated coastal process model is capable of simulating flows induced by extreme conditions such as waves, surge tides, river flood flows, etc., and morphological changes induced by rapid coastal currents and waves. This developed supercritical flow model is based on the solution of the conservative form of the nonlinear shallow water equations with the effects of the Coriolis force, uneven bathymetry, wind stress, and wave radiation stresses. The forward Euler scheme is used for the unsteady term; and the convective term is discretized using the Godunov-type shock-capturing scheme along with the HLL Riemann solver on non-uniform rectilinear grids. The accuracy of the developed model is investigated by solving an experimental dam-break test case. Barrier island breaching, overflow and overwash due to severe storm attack are simulated and the predicted morphological changes associated to the events are analyzed to investigate the applicability of the model in a coast where all the physical forces are present.

关键词： coastal inlet coastal process modeling supercritical flow sediment transport barrier islands

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Modeling of dynamic response of poroelastic soil layers under wave loading

Mehmet Bar?? Can üLKER

《结构与土木工程前沿（英文）》 2014年第8卷第1期页码 1-18 doi: 10.1007/s11709-014-0233-2

摘要： In this paper, the dynamic response of saturated and layered soils under harmonic waves is modeled using the finite element method. The numerical results are then verified by corresponding analytical solutions which are also developed by the author. The equations governing the dynamics of porous media are written in their fully dynamic form and possible simplifications are introduced based on the presence of inertial terms associated with solid and fluid phases. The response variations are presented in terms of pore water pressure and shear stress distributions within the layers. It is determined that a set of non-dimensional parameters and their respective ratios as a result of layering play a major role in the dynamic response.

关键词： dynamic response of soils coupled flow-deformation finite elements analytical solution harmonic waves

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用于毫米波焦面阵成像系统的扩展半球介质透镜

孙忠良,窦文斌

《中国工程科学》 2000年第2卷第3期页码 42-47

摘要：

毫米波成像是近年来毫米波领域的一个研究热点，而焦面阵成像因其具有实时成像的优点更加受到重视。文中分析可用于焦面阵成像的扩展半球介质透镜。这种焦面阵成像结构将集成天线阵贴附在透镜背面接收透镜聚焦的功率，消除了集成天线工作在毫米波频段时存在的表面波对天线性能的影响，具有尺寸紧凑、损耗小的特点。采用Stmtton-Chu公式和射线追迹分析了电磁波人射到扩展半球透镜上时在其背面的场分布，即透镜的焦区场分布，以获得透镜用于焦面阵成像时的性能。为验证分析方法的正确性，对平面波垂直人射和会聚高斯束入射两种情形进行了实验验证，实验结果与理论分析吻合较好。该透镜天线还可用来消除常规集成毫米波系统中抛物面天线与集成前端之间的过渡，以降低损耗，改善系统性能，也可用于与准光系统的连接或耦合。该文结果将对上述应用提供理论指导。

关键词：毫米波天线成像扩展半球介质透镜

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几率波与量子效应的扭率问题

欧阳首承,李智兰,袁东升

《中国工程科学》 2005年第7卷第6期页码 1-6

摘要：

按曲率空间的扭率，对含有三阶非线性变量导数的Schrödinger变形等价程进行了数值分析，发现几率波的几率性原来是扭率的疏密流在特定条件下的准规则流，并为势场强度和粒子体元密度的相互作用与量子扭率效应项综合作用的结果；纯量子效应作用为非规则流。

关键词：扭率几率量子效应非线性不稳定曲率空间

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Dynamics simulation of bottom high-sediment sea water movement under waves

Xueyi YOU , Wei LIU , Houpeng XIAO ,

《结构与土木工程前沿（英文）》 2009年第3卷第3期页码 312-315 doi: 10.1007/s11709-009-0037-y

摘要： The movement of bottom high-sediment sea water under water waves, especially that of the high-sediment water layer close to the sea bottom, is important to the resuspension and settlement of sediment. Supposing that the high-sediment sea water is a Newtonian fluid, based on Navier-Stokes (N-S) theory, the movement of the interfaces of air-water and water-sediment water was tracked by the volume of fluid (VOF) method. The velocity field of sediment water was simulated by considering the effect of water waves. The results show that the movement of sediment water is very different from that of sea water, which provides a solid basis for understanding the resuspension and settlement of sediment and the formation of bottom stripe, and the VOF method can trace the movement of the two interfaces simultaneously; the movement of the air-water interface has a strong effect on that of the water-sediment water interface, while the effect of the water-sediment water interface movement on the air-water interface is not obvious.

关键词： volume of fluid (VOF) method high sediment sea water numerical simulation interface trace Navier-Stokes (N-S) theory

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Proca电磁理论的若干问题

黄志洵

《中国工程科学》 2005年第7卷第3期页码 6-12

摘要：

2004年6月，位于西非Oklo的美国Los Alamos实验室的核工业反应堆对实验数据做再分析后得出结论说，近20亿年内精细结构常数减小了4.5×10^-8。常数不常，意味着光速有很小的变化。这是最新的与狭义相对论不符的实验报告。另一方面，光子如有质量，Maxwell方程组将被Proca方程组所取代，而磁矢位（势）A将成为可观测量。而过去和现在都有许多方法测量光子的质量。

文章的主要目的是在Proca理论框架内研究电磁波波速，发现即使在自由空间（真空）条件下也会出现超光速传播；同时又对波导与Proca波的截止现象做了比较，给出了相应的结果。

关键词：狭义相对论 Maxwell方程组 Proca方程组电磁波波速光子的静止质量