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- W2034258052 abstract "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." @default.
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- W2034258052 date "2005-09-01" @default.
- W2034258052 modified "2023-09-26" @default.
- W2034258052 title "Tracking of Cracks in Airplane Components Using Nonlinear Surface Wave Propagation Techniques" @default.
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- W2034258052 doi "https://doi.org/10.4028/www.scientific.net/kem.293-294.549" @default.
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