Title
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Tracking of cracks in airplane components using nonlinear surface wave propagation techniques
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Author
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Abstract
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Ultrasonic surface waves provide a sensitive means to detect cracks in airplane structures. Until now several obstacles remained to use ultrasonic surface waves for on-line damage detection (i.e. in-flight). In this article a method will be proposed to detect a growing fatigue crack while the aircraft is operating. In contrast to classical ultrasonic measurement methods, that use a high voltage pulse, we applied an optimized multi-sine excitation signal with an amplitude of a few volts only (this agrees better with the applicable safety regulations for aircraft). Furthermore, an indicator quantifying the nonlinearity of the ultrasonic surface wave propagation is used. By using a nonlinearity index the influence of changing operation conditions that can be observed with most linear methods is eliminated. The proposed method is validated on a steel beam that is fatigue loaded with a force signal obtained from in-flight data. |
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Language
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English
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Source (journal)
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KEY ENGINEERING MATERIALS
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Source (book)
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6th International Conference on Damage Assessment of Structures (DAMAS, 2005), July 04-06, 2005, Gdansk, Poland
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Publication
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2005
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ISBN
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0-87849-976-8
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DOI
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10.4028/WWW.SCIENTIFIC.NET/KEM.293-294.549
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Volume/pages
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293-294
(2005)
, p. 549-556
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ISI
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000230988800063
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Full text (Publisher's DOI)
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