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论文类型：期刊论文

发表时间：2017-05-01

发表刊物：SMART MATERIALS AND STRUCTURES

收录刊物：SCIE、EI、Scopus

卷号：26

期号：5

ISSN号：0964-1726

关键字：structural health monitoring; Lamb wave; lead zirconate titanate sensor; wavelet decomposition; Hilbert transform

摘要：Lamb waves have great potential as a diagnostic tool in the application of structural health monitoring. Propagation properties of Lamb waves are affected by the state of the structure that the waves are traveling upon. Thus Lamb waves can carry information about the structure as they travel across a structure. However, the dispersive, multimodal and attenuation characteristics of Lamb waves make it difficult to determine the time of arrival of Lamb waves. To deal with these characteristics, an innovative method to automatically determine the time of arrival for impact-induced Lamb waves without human intervention is proposed in this paper. Lead zirconate titanate sensors mounted on the surface of an aluminum plate were used to measure the Lamb waves excited by an impact. The time of arrival was determined based on wavelet decomposition, Hilbert transform and statistics (Grubbs' test and maximum likelihood estimation). Both of numerical analysis and physical measurements have verified the accuracy of this method for impacts on an aluminum plate.