In-situ monitoring of active crack in steel structure using acoustic emission technique

Li, Li, Peng, Zhongxiao, and Zhao, Meiyun (2009) In-situ monitoring of active crack in steel structure using acoustic emission technique. In: Proceedings of the 2009 International Conference on Measuring Technology and Mechatronics Automation (1), pp. 229-232. From: 2009 International Conference on Measuring Technology and Mechatronics Automation, 11-12 April 2009, Hunan, China.

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Abstract

The paper introduces a non-destructive testing (NDT) method-Acoustic Emission (AE) technique to detect active crack in steel structure of large lifting machinery used in hydropower stations. A test apparatus has been established, in which a beam with seeded cracks was loaded using a press machine. AE signals were collected during the test. Due to the complexity of the AE signals, Empirical Mode Decomposition (EMD) has been exploited to decompose them. The results have demonstrated that the frequency feature band is low in the crack initiation. With the crack growth, the frequency feature band becomes higher. The total frequency range of the crack propagation is 25 KHz-160 KHz. The research work has laid a theoretical foundation to application of the AE technology for safety evaluation of steel structures in lifting machinery. It also demonstrates that AE technique is an effective method for in-situ monitoring of the steel structures.

Item ID: 11024
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: acoustic emission; acoustic emission; active crack; frequency feature; steel structure of lifting machinery
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ISBN: 978-0-7695-3583-8
Date Deposited: 14 May 2010 00:32
FoR Codes: 09 ENGINEERING > 0913 Mechanical Engineering > 091301 Acoustics and Noise Control (excl Architectural Acoustics) @ 100%
SEO Codes: 86 MANUFACTURING > 8614 Machinery and Equipment > 861403 Industrial Machinery and Equipment @ 100%
Citation Count from Scopus Scopus 1
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