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Experimental investigation of unbound nodes identification for metallic sandwich panels with truss core

机译：桁架夹芯金属夹芯板未结节点识别的实验研究

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摘要

Experimental investigation of metallic pyramidal sandwich panels with truss core in the cases of different extent and location of unbound nodes damages are conducted and a baseline-free damage identification method based on flexible matrix, gapped smoothing method and Teager energy operator is used. The influences of sensor density and Teager energy operator on the damage identification are also discussed. Moreover, a 0-1 unbound nodes identification method is also proposed to capture the shape and size of the unbound nodes damage zone. The results show that the proposed baseline-free method could identify the unbound nodes damage of metallic sandwich panels with truss core effectively. Increasing sensor density is beneficial for damage identification, and there is a critical sensor density for the identification of unbound nodes damage. Teager energy operator plays a very important role in suppressing fluctuations and singularities caused by non-damage factors, such as boundary condition, noise and shaker. The identified damage zone obtained by the 0-1 method is in accordance with the actual damage zone. (C) 2016 Elsevier Ltd. All rights reserved.
机译：进行了具有桁架芯的金属金字塔形夹芯板在不同程度和位置的未结节损伤情况下的实验研究，并采用了基于柔性矩阵，间隙平滑法和Teager能量算子的无基线损伤识别方法。还讨论了传感器密度和Teager能量算子对损伤识别的影响。此外，还提出了一种0-1未绑定节点识别方法来捕获未绑定节点损坏区域的形状和大小。结果表明，所提出的无基线方法可以有效地识别具有桁架芯的金属夹芯板的未约束节点损伤。传感器密度的增加对于损坏的识别是有益的，并且对于未绑定节点的损坏的识别存在关键的传感器密度。 Teager能量算子在抑制非破坏性因素（如边界条件，噪声和振动器）引起的波动和奇异性方面起着非常重要的作用。通过0-1方法获得的确定的损坏区域与实际损坏区域一致。 （C）2016 Elsevier Ltd.保留所有权利。

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