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首页> 外文期刊>Mechanical systems and signal processing >A noise-robust damage indicator for characterizing singularity of mode shapes for incipient delamination identification in CFRP laminates
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A noise-robust damage indicator for characterizing singularity of mode shapes for incipient delamination identification in CFRP laminates

机译：噪声鲁棒性损坏指示器，用于表征模式形状的奇异性，以识别CFRP层压板中的初期分层

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Identification of delaminations in the early stage is crucial to ensure the safety of CFRP laminates. In the modal domain, high spatial sampling resolution of a mode shape is required for precise location of incipient delamination. Non-contact measurement relying on laser scanning technology allows measured mode shapes to be densely sampled. Unfortunately, noise components usually contaminate such densely-sampled mode shapes, easily causing intense noise interference that likely masks actual delamination features. To address this issue, a noise-robust damage indicator is formulated for designating the presence and location of incipient delamination in CFRP laminates under noisy environments. This damage indicator is created by introducing a 2D multi-resolution modal Teager-Kaiser energy for characterizing delamination-caused singularity of mode shapes. Proof of concept of the damage indicator is numerically undertaken in finite-element CFRP laminates with incipient delaminations, with emphasis on sensitivity to damage as well as robustness against noise. The applicability of the damage indicator is experimentally validated on a CFRP laminate with an incipient delamination, mode shapes of which are precisely acquired via the non-contact measurement using a scanning laser vibrometer. The numerical and experimental results show that the damage indicator can effectively identify the presence and location of incipient delamination in CFRP laminates under noisy environments. (C) 2018 Published by Elsevier Ltd.
机译：早期识别分层对于确保CFRP层压板的安全至关重要。在模态域中，模式分层的高空间采样分辨率对于初始分层的精确定位是必需的。依靠激光扫描技术的非接触式测量可以对被测模态进行密集采样。不幸的是，噪声成分通常会污染这种密集采样的模式形状，从而容易引起强烈的噪声干扰，从而可能掩盖实际的分层特征。为解决此问题，制定了一种抗噪声损伤指示器，用于指定嘈杂环境下CFRP层压板中初期分层的存在和位置。通过引入2D多分辨率模态Teager-Kaiser能量来创建此损伤指标，以表征分层引起的模态形状的奇异性。损伤指示器的概念证明是在具有初期分层的有限元CFRP层压板中进行的，重点是对损伤的敏感性以及对噪声的鲁棒性。损伤指示器的适用性已在具有初期分层的CFRP层压板上进行了实验验证，其模式形状是通过使用扫描激光振动计的非接触式测量精确获得的。数值和实验结果表明，损伤指标可以有效地识别嘈杂环境下CFRP层压板中初期分层的存在和位置。 （C）2018由Elsevier Ltd.发布

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