TY - CONF A1 - Hu, Wei-Hua A1 - Thöns, Sebastian A1 - Said, Samir A1 - Rücker, Werner A2 - Cunha, A. A2 - Caetano, E. A2 - Ribeiro, P. A2 - Müller, G. T1 - Resonance phenomenon in a wind turbine system under operational conditions T2 - EURODYN 2014 - 9th International conference on structural dynamics (Proceedings) N2 - A prototype of wind turbines in 5 megawatt dass was built and tested at the first German offshore wind energy test fteld in the North Sea. In order to investigate dynamic behaviors under a complex state of loads, a continuous dynamic monitoring System was implemented by Federal Institute for Material Research and Testing (BAM). It recorded structural responses and environmental/operational variables from November 2007 to October 2009. This paper presents significant resonance phenomenon due to the interaction in the tower-nacelle System under operational conditions. Modal parameters are automatically estimated by the poly reference Least Square Complex Frequency domain (p-LSCF) method. Campbell plot demonstrates that a three-blade passage frequency and its multiples f3n match with the natural frequencies of the wind turbine System in several modal Orders. The damping estimates decrease and the Vibration amplitude increase significantly. A control System is necessary to minimize the excessive vibrations. T2 - EURODYN 2014 - 9th International conference on structural dynamics CY - Porto, Portugal DA - 30.06.2014 KW - Wind turbine KW - Tower-nacelle system KW - Resonance KW - Continuous dynamic monitoring KW - Automated operational modal analysis PY - 2014 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/32970 AN - OPUS4-32970 SN - 978-972-752-165-4 SN - 2311-9020 SP - 3619 EP - 3626 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany