| 摘要 |
Wind turbine having a number of blades (1), a sensor being provided on at least one of the blades. The sensor is formed of a tri-axial accelerometer (2) for indicating the stresses to which the blade (1) has been subjected. As a result a detailed picture is given of both edge-wise and flap-wise vibrations of the blade (1) such that the state of the blade is determined more accurately. By means of a processing unit (10) both the edge-wise and the flap-wise natural frequency of the blade (1) can be estimated. If one of these frequencies changes considerably or abriptly, this indicates that the blade (1) has been damaged. |
