Damage Detection for Tripod-type Offshore Wind Turbine Structures Using Modal Strain Energy Methods

摘要

In this paper, a thorough damage detection study for tripod-typernoffshore wind turbine (OWT) structure is investigated. First, tworndamage locations are chosen based on the strength analysis results.rnDamages are simulated according to the likely damage patterns of eachrnmember. Modal strain energy (MSE) method and modal strain energyrndecomposition (MSED) method are applied for the damage detectionrnprocedure where the "measured" data are generated from a finiteelementrnmodel while adding the simulated measurement noise. Bothrncomplete and incomplete measured modal data cases are consideredrnduring various damage scenarios. The numerical results suggest thatrndamage members can be diagnosed exactly with complete modal data.rnWhen spatial incomplete modal data is available, the damage area canrnbe identified.