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首页> 外文期刊>Engineering Structures >Investigating a common premise in structural health monitoring: Are higher modal frequencies more sensitive to an incipient crack on a beam than lower ones?
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Investigating a common premise in structural health monitoring: Are higher modal frequencies more sensitive to an incipient crack on a beam than lower ones?

机译：研究结构健康监测中的一个共同前提：较高的模态频率是否比较低的模态频率更敏感？

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摘要

This paper has investigated a well-known premise in structural health monitoring that higher modal frequencies are more sensitive to an incipient crack on a beam than lower ones. Representing the fractional reduction in modal frequency caused by the crack, normalized modal frequency shift (NMFS) is formulated and expressed as a simple closed-form solution. The NMFS-factor which determines the NMFS is proved to decline as the mode number increases implying that the fractional reduction in modal frequency becomes less sensitive to the crack in higher frequency range. The validity of the proposed approach is demonstrated through the comparison to the finite element analysis results and experimental data. Theoretical proof, numerical and experimental observations have indicated that the fractional reduction in modal frequency decreases with mode number though the absolute reduction increases.
机译：本文研究了结构健康监测中的一个著名前提，即较高的模态频率比较低的频率对梁上的初期裂纹更敏感。代表由裂纹引起的模态频率的部分减小，将规范化的模态频移（NMFS）公式化并表示为简单的封闭形式解决方案。证实了确定NMFS的NMFS因子随着模数增加而下降，这意味着模态频率的分数减小对较高频率范围内的裂纹变得不太敏感。通过与有限元分析结果和实验数据的比较证明了该方法的有效性。理论证明，数值和实验观察表明，模态频率的分数减小随模数而减小，尽管绝对减小增加。

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