Structural health monitoring during fatigue of composite marine propellers
Arnaud Huijer (TU Delft - Mechanical Engineering)
Christos Kassapoglou (TU Delft - Aerospace Engineering)
Lotfollah Pahlavan (TU Delft - Mechanical Engineering)
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Abstract
Flexible composite marine propeller blades can offer the potential for reduced greenhouse gas emissions as well as a reduction in underwater radiated noise. Nevertheless, their application in the real world is hindered, among others, by unknowns in the fatigue behaviour of these blades. This research assesses the structural health measurements of an experimental campaign wherein a glass-fibre reinforced plastic marine propeller blade was tested under 1½ times the design operational load for 16 million cycles. Acoustic emissions were investigated that were recorded underwater by hydrophones that were placed close by the blade. Approximately 40Gb of AE feature data was obtained, alongside 200+Gb of waveform data. The feature data was filtered to only assess the data pertaining to the hydrophones, with a focus on hit-rate over time and cumulative energy. The results give an insight into the fatigue behaviour of the blade, alongside considerations regarding placement of hydrophones and comparison to other relevant data such as load-displacement histories and visual observations.
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