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Damage Identification in Structures Based on Energy Curvature Difference of Wavelet Packet Transform

机译：基于小波包变换的能量曲率差的结构损伤识别

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摘要

Damage identification is of tremendous significance in engineering structures. One key issue in damage identification is to determine an index that is sensitive to the structural damage. Current damage identification indices are generally focused on dynamic characteristics such as the natural frequencies, modal shapes, frequency responses, or their mathematical combinations. In this study, based on the wavelet packet transform, we propose a novel index, the energy curvature difference (ECD) index, to identify the damage in structures. The ECD index is the summation of component energy curvature differences after a signal is decomposed using WPT. Moreover, two numerical examples are used to demonstrate the feasibility and validity of the proposed ECD index for damage identification. Stiffness reduction is employed to simulate the structural damage. The damage can be identified by the ECD index curve plot. The results of the examples indicate that the proposed ECD index is sensitive to low damage levels because even 5% stiffness reduction can be apparently identified. The proposed ECD index can be employed to effectively identify structural damage.
机译：损伤识别在工程结构中具有重要意义。损伤识别中的一个关键问题是确定对结构损伤敏感的指标。当前的损害识别指标通常集中于动态特性，例如固有频率，模态形状，频率响应或其数学组合。在这项研究中，基于小波包变换，我们提出了一种新的指标，即能量曲率差（ECD）指标，以识别结构中的损伤。 ECD指数是使用WPT分解信号后的组件能量曲率差的总和。此外，使用两个数值示例来证明所提出的ECD指标用于损伤识别的可行性和有效性。采用降低刚度来模拟结构损伤。损坏可以通过ECD指数曲线图确定。实例的结果表明，建议的ECD指数对低损伤水平敏感，因为即使可以明显地识别出5％的刚度降低。建议的ECD指数可用于有效识别结构损坏。

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  • 来源
    《Shock and vibration》 |2018年第5期|4830391.1-4830391.13|共13页
  • 作者

    Shi Qinghe; Wang Pengbo;

  • 作者单位

    Beihang Univ, Beijing Univ Aeronaut & Astronaut, Inst Solid Mech, Beijing 100191, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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