Strategies for guided-wave structural health monitoring
Strategies for guided-wave structural health monitoring
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DOI：
10.1098/rspa.2007.0048
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发表时间：
2007-09-17
影响因子：
3.5
通讯作者：
Konstantinidis, G.
中科院分区：
文献类型：
--
作者：
Croxford, A. J.;Wilcox, P. D.;Konstantinidis, G.
结构健康监测（SHM）使用导波是唯一的方法之一，在结构的任何地方都可以检测到损伤使用永久连接的传感器稀疏阵列。为了从结构特征中区分损伤，必须与无损伤参考数据进行某种形式的比较，这里考虑减法。损伤的可检测性由参考数据相减后剩余的结构特征残差信号的幅值决定。由于环境条件（如温度）的变化，这些是非零的。本文对不同导波SHM策略下的残差信号幅度进行了量化。比较了两种参考信号减法方法和两种候选传感器配置。这些研究可以估计每单位面积所需的传感器数量，以可靠地检测规定类型的损害。结果表明，即使在存在适度温度波动的情况下，所需的数量也高得令人望而却步，因此，为了使导波SHM系统可行，某种形式的温度补偿是绝对必要的。研究了一种潜在的解决方案，并证明它可以提供约30 dB的信号抑制改进，这相当于所需传感器数量减少了两个数量级。
Structural health monitoring (SHM) using guided waves is one of the only ways in which damage anywhere in a structure can be detected using a sparse array of permanently attached sensors. To distinguish damage from structural features, some form of comparison with damage-free reference data is essential, and here subtraction is considered. The detectability of damage is determined by the amplitude of residual signals from structural features remaining after the subtraction of reference data. These are non-zero due to changing environmental conditions such as temperature. In this paper, the amplitude of the residual signals is quantified for different guided-wave SHM strategies. Comparisons are made between two methods of reference signal subtraction and between two candidate sensor con. gurations. These studies allow estimates to be made of the number of sensors required per unit area to reliably detect a prescribed type of damage. It is shown that the number required is prohibitively high, even in the presence of modest temperature fluctuations, hence some form of temperature compensation is absolutely essential for guided-wave SHM systems to be viable. A potential solution is examined and shown to provide an improvement in signal suppression of approximately 30 dB, which corresponds to two orders of magnitude reduction in the number of sensors required.