Experimental and numerical study on the detection of fatigue failure in hydraulic turbines

Detecting fatigue cracks in hydraulic turbine runners is costly, as it requires stopping the unit, emptying it of water and accessing the runner for inspection. Thus, an alternative way based on monitoring the changes of the structural modal response induced by the formation and growth of a crack wa...

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Bibliographic Details
Published in:Journal of mechanical science and technology 2023, 37(10), , pp.4949-4955
Main Authors: Sánchez-Botello, Xavier, de la Torre, Adolfo, Roig, Rafel, Jou, Esteve, de la Torre, Oscar, Ayneto, Javier, Escaler, Xavier
Format: Article
Language:English
Subjects:
Control
Crack propagation
Dynamical Systems
Engineering
Fatigue cracks
Fatigue failure
Flaw detection
Fracture mechanics
Hydraulic turbines
Industrial and Production Engineering
Mechanical Engineering
Modal response
Numerical prediction
Original Article
Resonant frequencies
Structural health monitoring
Vibration
Vibration mode
Vibration monitoring
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Summary:Detecting fatigue cracks in hydraulic turbine runners is costly, as it requires stopping the unit, emptying it of water and accessing the runner for inspection. Thus, an alternative way based on monitoring the changes of the structural modal response induced by the formation and growth of a crack was investigated. To do so, the crack propagation induced by a resonance was numerically predicted and experimentally machined on a disk-like structure that resembles a Kaplan turbine runner. The analysis of the results shows how the different stages of the fatigue crack growth can be monitored based on the change of the natural frequencies and mode shapes of several specific modes. Based on the obtained results, a structural health monitoring system is being designed to monitor the turbine runner modes of vibration without the need to stop and inspect the unit.
ISSN:1738-494X
1976-3824
DOI:10.1007/s12206-023-0902-y