Raimund Rolfes, Moritz W. Häckell, Johannes Reetz, Gerrit Haake
|Titel:||Damage Identification at Offshore Wind Energy Converters Using the Multiparameter Eigenvalue Problem|
Regarding extreme dynamical loads and many load cycles acting on offshore wind energy converters during lifetime, there is a strong need for a functional health monitoring system. Traditional visual inspections for the large number of plants (<prt> extgreater</prt><prt> extgreater</prt>103) will only be possible during time slots with good weather conditions. Still, the access to the structure is difficult and time/cost consuming. Using the dynamic responses of the structure in combination with a validated mathematical model, the presented monitoring techniques show a suitable alternative to observe blades, tower and foundation. This includes minimizing the number of needed sensors and the possibility of automated continuous health monitoring. Hence, the costs of maintenance and repairs to extend lifetime can be minimized. A method for identifying a structure from response data is presented, as well as a tool to validate a given numerical structural model - both accessible through a graphic user interface (<prt>GUI).</prt> Finally the Multi-Parameter-Eigenvalue Problem (<prt>MEP)</prt> is executed on two examples, where an artificial damage is applied to onshore wind energy structures. The method shows the ability to identify, localize and quantify the applied damages.