A new signal reconstruction is proposed for damage detection on a simply supported beam using multiple measurements of displacement induced by a moving sprung mass. The new signal is constructed from the difference between the spatially integrated deflection for the intact (baseline) and damaged beams under quasi-static loading. To that end, it is shown that the static component of displacement from the dynamic moving mass experiment may be extracted very effectively using a robust smoothing technique and that this outperforms some comparable techniques. It is shown that by measuring displacement at a modest number of points on the beam the new reconstructed signal is able to detect the location of the damage more accurately than methods that use only a single-point data. In particular, the technique is able to detect damage present simultaneously at multiple locations and can do so with a highly variable moving mass velocity. In order to construct an a posteriori baseline, the strain data from the same traverse could be used to recover the displacement-time history of the intact beam, which could enhance the method by enabling the baseline to be determined from the same experiment, further eliminating effects of experimental conditions if required. However, a Monte Carlo simulation is run to consider the effect of signal noise, showing that the proposed damage detection strategy locates damage even in the presence of noise of 50% in the measured signals (\({\text {SNR}} =7\, {\text {dB}}\)).

中文翻译：

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一种新的信号重建，用于在受到移动质量的简单支撑梁上进行损伤检测

提出了一种新的信号重建方法，该方法可通过多次测量运动的簧载质量引起的位移来对简单支撑的梁进行损伤检测。新信号是由完整（基线）的空间积分偏转与准静态载荷下受损光束之间的差异构成的。为此，表明可以使用鲁棒的平滑技术非常有效地提取来自动态运动质量实验的位移的静态分量，并且其性能优于某些可比较的技术。结果表明，与仅使用单点数据的方法相比，通过测量光束上适当数量的点的位移，新重构的信号能够更准确地检测损坏的位置。尤其是，该技术能够同时检测在多个位置出现的损坏，并且可以在变化很大的移动质量速度下进行检测。为了构建后验基线，可以使用来自相同导线的应变数据来恢复完整梁的位移时间历史记录，这可以通过使基线能够从同一实验中确定来进一步增强该方法，从而消除了实验条件的影响（如果需要）。但是，运行蒙特卡罗模拟来考虑信号噪声的影响，表明即使在被测信号中存在50％的噪声的情况下，提出的损伤检测策略也可以定位损伤（来自相同导线的应变数据可用于恢复完整梁的位移时间历史记录，这可以通过使基线能够从同一实验中确定来进一步增强该方法，并在需要时进一步消除实验条件的影响。但是，运行蒙特卡罗模拟来考虑信号噪声的影响，表明即使在被测信号中存在50％的噪声的情况下，提出的损伤检测策略也可以定位损伤（来自相同导线的应变数据可用于恢复完整梁的位移时间历史记录，这可以通过使基线能够从同一实验中确定来进一步增强该方法，并在需要时进一步消除实验条件的影响。但是，运行蒙特卡罗模拟来考虑信号噪声的影响，表明即使在被测信号中存在50％的噪声时，所提出的损伤检测策略也可以定位损伤（\（{\ text {SNR}} = 7 \，{\ text {dB}} \））。