Rotor blades of offshore wind turbines are exposed to extreme environmental conditions and high dynamic stresses. At the same time they have a decisive influence on the energy yield and thus on the economic efficiency of a wind turbine. Incipient damage must be detected at the earliest stage possible and distinguished from normal environmental and operational influences. Severe damage can be prevented by the repair measures, which are comparatively inexpensive at this early stage. Downtimes due to damage that is not detected or detected too late are avoided and the energy yield can be increased.
SHM.Blade® is a tried and tested system, certified by DNV GL, that can detect such structural damage on rotor blades at an early stage. For this purpose, a reference condition is used which is determined individually for each rotor blade fully automatically and without external intervention immediately after the activation of SHM.Blade. Such a blade-specific learning phase ensures high sensitivity to damage - despite the mass and stiffness tolerances caused during production.
When the learning phase is completed, the system continuously calculates condition indicators, which provide information on the current condition of the blade at all times. By means of a two-level warning and alarm concept, the wind turbine control system can react and subsequent damage can be avoided.