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Resonant frequency range utilized electro-mechanical impedance method for damage detection performance enhancement on composite structures

机译:共振频率范围利用机电阻抗法增强复合材料结构的损伤检测性能

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摘要

One of the problems when using EMI method on composite structures with large surface areas can lead to unsuccessful damage detection due to a vague change in the impedance signature. In addition, a threshold value is usually defined to differentiate a damaged case from an intact case. Therefore, the change in the impedance signature subjected to damage must be significant enough to overcome the effects from other factors which can also cause a change in the impedance signature. In this study, a concept of enhancing the damage detection ability of EMI method using a piezoceramic (PZT) material is reported. The proposed technique eliminates the trial-and-error approach when determining a suitable frequency range by using a resonant frequency range acquired in the lower frequency range below 80 kHz, covering a large sensing area. The main idea is to create peaks in the impedance signature in a peak free zone by sacrificing the sensing area in order to significantly increase the sensitivity of the damage detection ability. The major advantages of the proposed technique is the utilization of the lower frequency range for damage identification using EMI method, while eliminating the time consuming problem of the trial-and-error method.
机译:在具有大表面积的复合结构上使用EMI方法时,问题之一可能是由于阻抗特征的模糊变化而导致损坏检测失败。另外,通常定义阈值以将损坏的情况与完整的情况区分开。因此,遭受损坏的阻抗信号的变化必须足够显着,以克服来自其他因素的影响,这些因素也可能导致阻抗信号的变化。在这项研究中,报告了一种使用压电陶瓷(PZT)材料增强EMI方法的损伤检测能力的概念。当通过使用在低于80 kHz的较低频率范围中获得的共振频率范围来确定合适的频率范围时,所提出的技术消除了反复试验的方法,该范围覆盖了较大的感测面积。主要思想是通过牺牲感测面积在无峰区域的阻抗特征中创建峰,以显着提高损伤检测能力的灵敏度。所提出的技术的主要优点是利用较低的频率范围来使用EMI方法进行损伤识别,同时消除了试错法的耗时问题。

著录项

  • 来源
    《Composite Structures》 |2012年第8期|p.2383-2389|共7页
  • 作者

    S. Na; H.K. Lee;

  • 作者单位

    Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea;

    Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea;

  • 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
  • 中图分类
  • 关键词

    electromechanical impedance; peak free signature; sensitivity; structural health monitoring; resonance frequency;

    机译:机电阻抗;无峰信号;灵敏度;结构健康监测;共振频率;

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