On damage localization in wind turbine blades: a critical comparison and assessment of modal-based criteria
Ntertimanis, Vasileios K.
- Conference Paper
The effective localization of damage in structural systems and components remains an active research topic in the engineering community. In contrast to damage detection, for which many alternative methods of a certain degree of functionality have already been established, damage localization is considerably more complicated and, in most cases, requires the availa- bility of redundant spatial information. The localization of the exact point where damage, once detected, exists is inherently de- pendent on the adoption of appropriate damage–sensitive features. In general, these should be selected in a way, that allows for the associated feature extraction procedure to take place in a “transformed domain”, where the initial information is significantly amplified for the location of damage. In this respect, vibration–based methods develop damage-sensitive features on the basis of the modal properties of a structure (e.g. natural frequencies, damping ratios and modal and operating shapes), or quantities that are derived from these (e.g. curvatures, flexibility, strain energy, etc.). In this work, we apply and compare the most common vibration–based criteria for damage localization, by considering a small-scale wind turbine blade as a case study (Fig.1). To this end, a 3-dimensional finite element model of the blade is utilized that consists of an exterior laminate composite surface, modelled with shell elements, and an interior foam represented by solid elements. The critical assessment ranks the efficacy of each method in terms of (i) infor- mation availability (e.g. input from all degrees of freedom vs. input from a sparse subset of nodes); (ii) various scenario of damage patterns of increasing severity; and (iii) sensitivity to noise. Show more
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Organisational unit03890 - Chatzi, Eleni / Chatzi, Eleni
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