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Thermal sensitivity of Lamb waves for structural health monitoring applications

机译:兰姆波对结构健康监测应用的热敏感性

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摘要

One of the drawbacks of the current Lamb wave structural health monitoring methods are the false positives due to changing environmental conditions such as temperature. To create an environmental insensitive damage detection scheme, the physics of thermal effects on Lamb waves must be understood. Dispersion and thermal sensitivity curves for an isotropic plate with thermal stress and thermally varying elastic modulus are presented. The thermal sensitivity of dispersion curves is analytically developed and validated by experimental measurements. The group velocity thermal sensitivity highlights temperature insensitive features at two critical frequencies. The thermal sensitivity gives us insight to how temperature affects Lamb wave speeds in different frequency ranges and will help those developing structural health monitoring algorithms.
机译:当前的兰姆波结构健康监测方法的缺点之一是由于诸如温度的变化的环境条件导致的误报。要创建对环境不敏感的损坏检测方案,必须了解对兰姆波的热效应的物理原理。给出了具有热应力和热变化弹性模量的各向同性板的色散和热敏感性曲线。色散曲线的热敏性通过实验测量得到了分析开发和验证。群速度热敏度突出了在两个临界频率下对温度不敏感的特征。热灵敏度使我们能够洞悉温度如何影响不同频率范围内的兰姆波速度,并将帮助那些开发结构健康监测算法的人。

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