Phase Gradient and Mode Conversion Estimation in 1D Damaged Structures

J. Ayers; N. Apetre; M. Ruzzene; V. K. Sharma

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Phase Gradient and Mode Conversion Estimation in 1D Damaged Structures

机译：一维损伤结构的相位梯度和模转换估计

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The article presents techniques for localization and quantification of defects based on the evaluation of reflection, transmission, and conversion of Lamb wave modes and of the spatial evolution of their phase. Reflection, transmission, and conversion coefficients are estimated using mode separation and incident-wave removal procedures implemented in the frequency/wavenumber domain. The practical implementation of the concept relies on the availability of spatially refined measurements, as provided for example by a Scanning Doppler Laser Vibrometer. The application to simulated and experimental data illustrate the effectiveness of the proposed procedures. Specifically, a finite element model of a 2D elastic domain in plane strain featuring a notch is used to estimate the reflection, transmission, and conversion coefficients. Such procedures rely on the spatial integration of wave amplitudes in contrast to pointwise estimations, as a way to reduce the effect of noise. Likewise, the techniques are demonstrated on experimental data obtained using a Scanning Laser Doppler Vibrometer on an aluminum plate with a notch.

机译：本文介绍了基于Lamb波模式的反射，透射和转换以及其相空间演变对缺陷进行定位和量化的技术。使用在频率/波数域中实现的模式分离和入射波去除过程，可以估算反射，透射和转换系数。该概念的实际实施依赖于空间精确测量的可用性，例如由扫描多普勒激光振动计所提供的。模拟和实验数据的应用说明了所提出程序的有效性。具体而言，使用具有缺口的平面应变中二维弹性域的有限元模型来估计反射，透射和转换系数。与逐点估计相反，此类过程依赖于波幅度的空间积分，以此来减少噪声的影响。同样，该技术在使用扫描激光多普勒振动计在带有缺口的铝板上获得的实验数据上得到了证明。

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来源
《Structural health monitoring》 |2011年第1期|p.65-82|共18页
作者
J. Ayers; N. Apetre; M. Ruzzene; V. K. Sharma;
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作者单位

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, USA;

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, USA;

School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA, USA;

Millennium Dynamics Corporation, Acworth, GA, USA;

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原文格式 PDF
正文语种 eng
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关键词
mode conversion; phase gradient; Lamb waves; wave propagation; damage localization; SLDV;

机译：模式转换;相位梯度羊肉波波传播损害定位;数码相机;

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Phase Gradient and Mode Conversion Estimation in 1D Damaged Structures

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