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Vibration-based damage detection in composite wingbox structures by HHT

机译：基于HHT的复合机翼盒结构基于振动的损伤检测

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摘要

A dynamic-based damage detection method for large structural systems using the Hilbert-Huang transform (HHT) has been proposed in this article. The proposed method has been verified numerically by implementing the scheme on a model of wingbox. In the implementation process, the following steps have been identified as being important: (1) axis-symmetry signal extension methods in order to solve the end effect problem of empirical mode decomposition (EMD), (2) finite element modelling for the purpose of establishing the base line, (3) a feature index vector for structural damage detection. The obtained results show that the damage feature index vector is more sensitive to small damage. Finally, the effect of noise is considered. Examination of the results confirms that the proposed damage detection method is very robust.
机译：本文提出了一种基于希尔伯特-黄（Hilbert-Huang）变换（HHT）的大型结构系统基于动力的损伤检测方法。通过在机翼盒模型上实施该方案，对所提方法进行了数值验证。在实施过程中，已确定以下重要步骤：（1）轴对称信号扩展方法，以解决经验模态分解（EMD）的端效应问题；（2）有限元建模确定基线，（3）用于结构损伤检测的特征索引向量。所得结果表明，损伤特征指标向量对小损伤更敏感。最后，考虑噪声的影响。对结果的检验证实了所提出的损坏检测方法非常可靠。

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