查询词典 lamb

In Chapter 7, attenuative Lamb wave propagation in adhesively bonded anisotropic composite plates is introduced.

第七章在粘接的各向异性复合材料中引入衰减的Lamb波。

As the foundation of ultrasonic testing of composite materials, this thesis is intended to explore in detail a number of features of wave propagation in anisotropic plates, and the following essential problems will be considered:(1) Propagation of plane bulk waves in homogeneous and orthotropic anisotropic media;(2) Lamb wave propagation in multilayered anisotropic plates;(3) Influence of isotropic solid or liquid loading on Lamb wave propagation in anisotropic solid media;(4) Influence of interface layers on Lamb wave propagation in layered anisotropic composite laminates;(5) Dispersion characteristic analysis of attenuation Lamb wave while existing an thin viscous layer which is used for simulating the poor curing in adhesively bonded joints.

作为复合材料超声检测的基础，本文研究了如下国际前沿性的课题：（1）平面体波在正交均匀各向异性媒质中的传播；（2）多层各向异性媒质中Lamb波的传播；（3）各向同性固体或液体负载对各向异性固体媒质中Lamb波传播的影响；（4）界面层对层状各向异性复合媒质中Lamb波传播的影响；（5）胶粘剂未固化而呈现粘弹性时粘接结构中衰减Lamb波的频散特性分析。

Annabella is attracted to the handsome and charismatic poet, even though she ought to know better, since she is related by marriage to Lady Caroline Lamb, whose affair with the young man "had begun to be talked about."

Annabella被容貌俊美的传奇诗人吸引，虽然她应该知道的更清楚一点，Lady Caroline Lamb将会因此成为她的姻亲，这位夫人的韵事已经传开。

The so called symmetric and antisymmetric Lamb waves are no longer symmetric and antisymmetric around the center line in the flat plate.

3在波结构上，对平板而言，所谓的"对称"和"反对称"Lamb波由于材料的梯度特性而变得不再严格的关于中心线对称或反对称。

Results show that, the double side excitation method, compared with the traditional single side one, can inhibit the multi-mode characteristic of Lamb waves and generate fundamental symmetric and antisymmetric modes at the relatively low exciting frequency. It can heighten the exciting effect and make it easy to analyze monitoring signals.

研究结果表明：与传统的单面激励方法相比，该激励方法能够抑制Lamb波的多模式特性，在频率较低的情况下可实现基本对称或反对称模式的产生，提高了Lamb波的激励效果，便于监测信号的分析。

Characteristics of Lamb wave propagation in multilayered composite plates are influenced by many factors, the most important of which are: constituent properties, thickness and fiber orientation, the number of layers, and lay-up sequence and the direction of wave propagation.

层状各向异性板中Lamb波的传播特性受许多因素的影响，其中最重要的影响因素是：组层材料的性质、厚度以及纤维的方向、层数、层序、Lamb波传播方向。

Then, the differential equations are solved by the Fourier expanding and Hankel integral transform method. Integral solutions of soil skeleton displacements and pore pressure as well as the total stresses for poroelastic media are obtained. Furthermore, a systematic study on Lamb's problems in transversely isotropic saturated half-space is performed. Integral solutions for surface radial, vertical and tangentical displacements are obtained both in the case of drained surface and in the case of undrained surface excited by vertical and tangentical harmonic resources respectively. Numerical results show the obvious difference between the model of isotropic saturated poroelastic media and that of transversely isotropic saturated poroelastic media.

其次，基于Biot波动理论，在圆柱坐标系下求解了横观各向同性饱和土的Biot波动方程：通过引入位移函数，在圆柱坐标系下将横观各向同性饱和土的Biot波动方程转化为两个解耦的6阶和2阶控制方程，然后根据方位角的Fourier展开和径向Hankel变换，求解波动方程，得到以土骨架位移和孔隙水压力为基本未知量的积分形式一般解，并用一般解给出了饱和土总应力分量的表达式；再以基本解为基础，系统地研究了横观各向同性饱和半空间体的Lamb问题，考虑表面排水或不排水两种情况后，首次得到横观各向同性饱和半空间体在表面竖向和水平谐振力作用的下径向、竖向和周向位移的解析解。

For the first situation, the horizontally polarized SH wave and the classical Lamb wave uncouple, which will simplify greatly the Lamb wave motion.

对第一种情况，水平偏振的SH波与经典Lamb波解耦，这将极大地简化Lamb波运动。

According to the purpose of the research in this paper, 3D elastic theory was chosen. The propagational characteristics of Lamb waves in isotropic and antisotropic materials were modeled and the dispersive curves of Lamb waves in an aluminum plate and a carbon fiber composite lamina were calculated separately through the given parameters of certain plate.

首先，比较了现有对Lamb波传播特性建模的方法，根据本文的研究目的选择三维弹性理论作为研究方法，对各向同性材料和各向异性材料中的Lamb传播特性进行建模。

The phase and group velocities of Lamb waves in the aluminum plate related to the frequency and the thickness of the plate because of the material characters. However, for the carbon fiber composite lamina, the situation was of difference, in which the velocities were with regarded to the frequency and thickness as well as the propagational direction and the fiber orientation.

输入铝板和碳纤维板的材料参数，即可得出铝板和碳纤维材料单层板中Lamb波的频散曲线，铝板为各向同性材料，其中的Lamb波相群速度只与频率板厚的乘积相关，碳纤维板为各向异性材料，其中的Lamb波相群速度不仅与频厚积有关，还与Lamb波传播方向、碳纤维的铺层方向相关。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。