Environmental effects on lamb wave responses from piezoceramic sensors
Environmental effects on lamb wave responses from piezoceramic sensors
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DOI：
10.4028/www.scientific.net/msf.440-441.195
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发表时间：
2003-01-01
期刊：
影响因子：
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通讯作者：
Staszewski, WJ
中科院分区：
文献类型：
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作者：
Lee, BC;Manson, G;Staszewski, WJ
利用兰姆波进行结构健康监测是基于弹性波在板中传播的理论。利用信号衰减和模态转换进行损伤检测。众所周知，用于检测的低剖面压电陶瓷传感器的电压幅度可能不仅由于损坏，而且由于不适当的换能器耦合和温度效应而改变。本文研究了温度对兰姆波响应的影响。这项工作涉及一个简单的实验，其中两个压电陶瓷粘结在铝板。该板暴露于各种温度水平。从兰姆波响应中提取的一对夫妇的简单功能进行了分析，以显示温度变化的影响。随后对板进行了损伤试验，并重复进行了一系列试验和分析，以比较损伤和温度变化对响应的影响。讨论了如何使用适当的信号处理技术来规避这个问题的几种方法。
Structural Health Monitoring using Lamb waves is based on the theory of elastic waves propagating in plates. Signal attenuation and mode conversion are used for damage detection. It is well known that the voltage amplitude from low-profile piezoceramic sensors used for inspection may change not only due to damage but also due to an inappropriate transducer coupling and temperature effects. The paper studies the effect of temperature on Lamb wave responses. The work involves a simple experiment in which two piezoelectric ceramics are bonded on an aluminium plate. The plate is exposed to various levels of temperature. A couple of simple features extracted from the Lamb wave responses are analysed to show the effect of the temperature changes. The plate was later subjected to damage and the series of tests and analysis repeated in order to give some comparison between the effects of damage and temperature change upon the responses. Several ways of how this problem can be circumvented using appropriate signal processing techniques are discussed.