Patent ID: 9032807
Filing Date: 2015-05-19
Classification: F03D,F05B,G01L,G01M,Y02E

Abstract:
1. A method of monitoring bending strain on a wind turbine blade, comprising: locating strain sensors of at least three strain sensor pairs on the wind turbine blade, such that edgewise bending and flapwise bending can be determined from strain measurements provided by the strain sensors; receiving the strain measurements from the strain sensors; calculating a plurality of solutions for a resultant bending strain based on combinations of at least three bending strains respectively calculated for the at least three strain sensor pairs using the strain measurements; calculating an average solution for the resultant bending strain from the plurality of solutions for the resultant bending strain; and calculating a confidence value for a first strain sensor of the strain sensors based on a comparison of one solution of the plurality of solutions for the resultant bending strain derived from a strain measurement received from the first sensor versus the average solution for the resultant bending strain.