Identification and Avoidance of Systematic Measurement Errors in Lamb Wave Observation With One‐Dimensional Scanning Laser Vibrometry
Identification and Avoidance of Systematic Measurement Errors in Lamb Wave Observation With One‐Dimensional Scanning Laser Vibrometry
复制标题
一维扫描激光测振法观测兰姆波中系统测量误差的识别和避免
作者：
M. N. Neumann;B. Hennings;R. Lammering
扫描激光振动仪是一种广泛应用于结构健康监测的兰姆波场观测工具。兰姆波在薄壁结构中长距离传播，并与结构不均匀性相互作用，例如，损伤，尽管波长是损伤大小的几倍。在薄板和玻璃或碳纤维增强塑料板的SHM中，这种效应用于确定结构断层的位置和大小。通常使用的一维振动测量法，在测量斜角度运动时，会产生几何诱导的系统误差。在兰姆波的特殊情况下，这个误差可能是一个不可忽略的量。本文从幅值和相位两方面分析了兰姆波几何测量误差的性质。结果表明，在某些应用中应考虑到这一问题。
Scanning laser vibrometry is a widely used tool to observe Lamb wave fields for structural health monitoring (SHM) purposes. Lamb waves propagate over long distances in thin‐walled structures and interact with structural inhomogeneities, for example, damages, in spite of wavelengths several times of the damage size. In SHM of sheets and glass‐ or carbon‐fibre‐reinforced plastic plates, this effect is used for determining the position as well as the size of structural faults. With the often employed one‐dimensional vibrometry, a geometrically induced, systematic error occurs when measuring oblique‐angled motion. This error can be, in the specific case of Lamb waves, of a non‐negligible quantity. The nature of this geometrical measurement error in general and concerning Lamb waves in special is discussed analytically for both amplitude and phase data. It is shown that this matter should be taken into account in some applications.
DOI：
10.1117/12.848621
发表时间：
2010-03
期刊：
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影响因子：
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作者：
P. Fromme
通讯作者：
P. Fromme
根据奈奎斯特和香农的数字采样
DOI：
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发表时间：
2002
期刊：
影响因子：
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作者：
T. Lagö
通讯作者：
T. Lagö
碳纤维增强板低速冲击损伤分析的兰姆波传播：实验和数值经验
DOI：
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发表时间：
2009
期刊：
影响因子：
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作者：
S. Tancredi;F. Ricci;E. Monaco;L. Lecce;Sauvik Banerjee;A. Mal
通讯作者：
A. Mal