Wind Energy

304 J. Reetz
investigated are, e.g. accuracy of eigenfrequencies, size of damaged area,
stiffness reduction, location, number of damages, number of considered eigenfrequencies.
It turned out that the crucial parameter, which essentially influences
the method, is the accuracy of the eigenfrequencies. A residual analysis
determines the best fit for the simulated data, which is achieved by a linear
proportionality function. The confidence interval is unchanged over the area of
validity as well as the limit of quantification. Thus detection and quantification
have the same sensitivity.
56.4 Outlook
The next step of the validation of method is the confirmation of the results of
the simulations on test structures. For this purpose scale test models will be
established and tests will be carried out in the laboratory and under natural
excitation. Before real application on wind turbines further tests on large
structures with real or artificial damages are desirable.
References
1. Turek M, Ventura C (2005) Finite Element Model Updating of a Scale-Model
Steel Frame Building. In: Proceedings of the 1st IOMAC
2. Cottin N (2001) Dynamic model updating–a multiparameter eigenvalue problem.
Mechanical Systems and Signal Processing 15:649–665
3. Atkinson FV (1972) Multiparameter Eigenvalue Problems I – Matrices and
Compact Operators. Academic, New York, London