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- W2149765535 abstract "Cracking is a common type of failure in machines and structures. Cracks must be detected at an early stage before catastrophic failure. In structural health monitoring, changes in the vibration characteristics of the structure can be utilized in damage detection. A fatigue crack with alternating contact and non-contact phases results in a non-linear behaviour. This type of damage was simulated with a finite element model of a simply supported beam. The structure was monitored with a sensor array measuring transverse accelerations under random excitation. The objective was to determine the smallest crack length that can be detected. The effect of the sensor locations was also studied. Damage detection was performed using the generalized likelihood ratio test (GLRT) in time domain followed by principal component analysis (PCA). Extreme value statistics (EVS) were used for novelty detection. It was found that a crack in the bottom of the midspan could be detected once the crack length exceeded 10% of the beam height. The crack was correctly localized using the monitoring data." @default.
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- W2149765535 date "2013-07-01" @default.
- W2149765535 modified "2023-10-05" @default.
- W2149765535 title "Vibration-Based Structural Health Monitoring of a Simulated Beam with a Breathing Crack" @default.
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- W2149765535 doi "https://doi.org/10.4028/www.scientific.net/kem.569-570.1093" @default.
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