Crack Monitoring of Operational Wind Turbine Foundations
AbstractThe degradation of onshore, reinforced-concrete wind turbine foundations is usually assessed via above-ground inspections, or through lengthy excavation campaigns that suspend wind power generation. Foundation cracks can and do occur below ground level, and while sustained measurements of crack behaviour could be used to quantify the risk of water ingress and reinforcement corrosion, these cracks have not yet been monitored during turbine operation. Here, we outline the design, fabrication and field installation of subterranean fibre-optic sensors for monitoring the opening and lateral displacements of foundation cracks during wind turbine operation. We detail methods for in situ sensor characterisation, verify sensor responses against theoretical tower strains derived from wind speed data, and then show that measured crack displacements correlate with monitored tower strains. Our results show that foundation crack opening displacements respond linearly to tower strain and do not change by more than ±5
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Perry, M.; McAlorum, J.; Fusiek, G.; Niewczas, P.; McKeeman, I.; Rubert, T. Crack Monitoring of Operational Wind Turbine Foundations. Sensors 2017, 17, 1925.
Perry M, McAlorum J, Fusiek G, Niewczas P, McKeeman I, Rubert T. Crack Monitoring of Operational Wind Turbine Foundations. Sensors. 2017; 17(8):1925.Chicago/Turabian Style
Perry, Marcus; McAlorum, Jack; Fusiek, Grzegorz; Niewczas, Pawel; McKeeman, Iain; Rubert, Tim. 2017. "Crack Monitoring of Operational Wind Turbine Foundations." Sensors 17, no. 8: 1925.
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