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 25KHz-160KHz. 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
