University of Bristol, Mechanical Engineering, Queens Building, University Walk, Bristol, Avon BS8 1TR, United Kingdom.
Ultrasonics. 2010 Apr;50(4-5):517-28. doi: 10.1016/j.ultras.2009.11.002. Epub 2009 Nov 26.
The application of temperature compensation strategies is important when using a guided wave structural health monitoring system. It has been shown by different authors that the influence of changing environmental and operational conditions, especially temperature, limits performance. This paper quantitatively describes two different methods to compensate for the temperature effect, namely optimal baseline selection (OBS) and baseline signal stretch (BSS). The effect of temperature separation between baseline time-traces in OBS and the parameters used in the BSS method are investigated. A combined strategy that uses both OBS and BSS is considered. Theoretical results are compared, using data from two independent long-term experiments, which use predominantly A(0) mode and S(0) mode data respectively. These confirm that the performance of OBS and BSS quantitatively agrees with predictions and also demonstrate that the combination of OBS and BSS is a robust practical solution to temperature compensation.
在使用导波结构健康监测系统时，温度补偿策略的应用非常重要。不同的作者已经表明，环境和操作条件变化的影响，特别是温度，限制了性能。本文定量描述了两种不同的补偿温度效应的方法，即最佳基线选择（OBS）和基线信号拉伸（BSS）。研究了 OBS 中基线时间轨迹之间的温度分离和 BSS 方法中使用的参数的影响。考虑了一种同时使用 OBS 和 BSS 的组合策略。使用来自两个独立的长期实验的数据进行了理论结果比较，这两个实验分别主要使用 A(0)模式和 S(0)模式数据。这些结果证实了 OBS 和 BSS 的性能与预测定量一致，并且还表明 OBS 和 BSS 的组合是温度补偿的一种稳健的实用解决方案。
