TY - CONF A1 - Hille, Falk A1 - Petryna, Y. A1 - Rücker, Werner ED - Cunha, A. ED - Caetano, E. ED - Ribeiro, P. ED - Müller, G. T1 - Subspace-based detection of fatigue damage on a steel frame laboratory structure for offshore applications T2 - EURODYN 2014 - 9th International conference on structural dynamics (Proceedings) N2 - Altematively to common modal analysis as tool for detectmg changes between a reference and an actual (possibly damaged) structural state, the subspace-based damage detection method has been developed in recent years and successfully adopted to test application data sets. Characteristic for that method is that instead of analyzing modal parameters, a Statistical test with respect to changes of a dynamic signature of structural response is introduced. Therefor, a Gaussian residual vector is extracted from the subspace of an output only Vibration data covariance matrix within the reference state. The paper describes the application of this damage detection method within a laboratory fatigue test on a Steel frame structure. Aim of the investigation was to analyze the usability and efficiency of the detection method for realistic damage on carrying structures of wind energy turbines. In a second Step, a numerical model of the lab test structure is developed and validated. Thus, a comparable numerical Simulation of the fatigue damage detection was feasible and the accuracy of the Simulation procedure could be verified. The present study describes the first Step in a two-step approach for quantifying and optimizing fundamental characteristics of SHM Systems for offshore wind turbine structures concerning a required number of sensors and their optimal location. T2 - EURODYN 2014 - 9th International conference on structural dynamics CY - Porto, Portugal DA - 30.06.2014 KW - Damage detection KW - Offshore wind energy KW - Subspace-based detection KW - Schadensdetektion KW - Offshore-Windenergie KW - Subspace-basierte Verfahren PY - 2014 UR - http://paginas.fe.up.pt/~eurodyn2014//CD/papers/506_MS25_ABS_1788.pdf SN - 978-972-752-165-4 SN - 2311-9020 SP - MS25, 3595 EP - 3602 AN - OPUS4-31219 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hille, Falk A1 - Petryna, Y. A1 - Rücker, Werner T1 - Subspace-based detection of fatigue damage on jacket support structures of offshore wind turbines T2 - EWSHM 2014 - 7th European workshop on structural health monitoring (Proceedings) N2 - The paper describes the application of the Stochastic Subspace-based Damage Detection (SSDD) method on model structures for an utilization of this approach on offshore wind turbine structures. Aim of the study was therefore to analyze the usability and efficiency of the detection method as well as to determine an optimized set of parameter for realistic damage on support structures of wind energy turbines. Based on results of an experimental fatigue test on a Steel frame laboratory structure a strategy for a numerical verification of the experimentally evolved damage detection was developed, utilizing a time integration approach to simulate the dynamic response. In a second Step the identified modeling and computing methodology is used to numerically investigate the ability to detect damage in real size structural components of offshore wind turbines. T2 - EWSHM 2014 - 7th European workshop on structural health monitoring CY - Nantes, France DA - 08.07.2014 KW - Damage detection KW - Offshore wind turbines KW - Numerical response PY - 2014 SP - 229 EP - 236 AN - OPUS4-31218 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -