| 摘要 |
Method and system of monitoring bending strain on a wind turbine blade 5, where the method comprises locating at least three strain sensors 20, such as a Fibre Bragg Grating sensor, on the turbine blade such that edgewise and flapwise bending can be determined from strain measurements provided by the sensors, calculating a plurality of resultant bending strains using the strain measurements, calculating an average resultant bending strain from the plurality of resultant bending strains and calculating a confidence value for a first sensor based on a comparison of resultant bending strains derived from the strain measurement from the first sensor with the average resultant bending strain. Preferably the individual strain measurements are converted into bending moments before calculating resultant bending moment and average resultant bending moment. The confidence value may be based on an absolute difference between the resultant bending strains derived from measurement from the first sensor with the average resultant bending strain. |
