| 摘要 |
Method and system of detecting ice or other foreign matter on a wind turbine blade 5 or damage to a wind turbine blade, the method comprising measuring twisting torque on the blade about its longitudinal axis to provide a detected torque signal, comparing a value based on the detected torque signal with a comparison value, where the comparison value is derived from one or more measured parameters having a predetermined relationship with the twisting torque about the longitudinal axis of the blade when the blade is operating under normal operating conditions; and determining that ice or other foreign matter is on the blade or that the blade is damaged if the value based on the detected torque signal differs from the comparison value by more than a predetermined amount. Preferably the one or more measured parameters comprise bending moments of the blade and are measured using strain sensors. |
