TY - CONF A1 - Rücker, Werner A1 - Said, Samir A1 - Rohrmann, Rolf A1 - Schmid, Wolfgang A1 - Hille, Falk A1 - Mehdianpour, Milad T1 - Aufgaben der Dauerüberwachung und baulichen Bewertung am Beispiel von Betonbrücken und Windenergieanlagen T2 - Fachtagung 2005 des Deutschen Ausschusses für Stahlbeton "Zerstörungsfreie Prüfverfahren und Bauwerksdiagnose im Betonbau" CY - Berlin, Deutschland DA - 2005-03-10 KW - Monitoring KW - Zustandsüberwachung KW - Verkehrslasten KW - Dynamik KW - Brücken KW - Windenergieanlagen KW - Bauliche Bewertung PY - 2005 SP - A39 EP - A46 PB - BAM CY - Berlin AN - OPUS4-7334 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hu, Wei-Hua A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Rücker, Werner ED - Xu, Y. L. ED - Zhu, S. ED - Xia, Y. ED - Ni, Y.Q. ED - Law, S.S. ED - Yin, J. H. ED - Su, Z.Q. T1 - Development of a vibration-based structural health monitoring system for wind turbines N2 - In the context of national innovative project IMO-WIND, an integrated long term monitoring System was installed on a prototype of an offshore wind turbine System of 5 megawatt dass. The Federal Institute for Materials Research and Testing (BAM) was responsible for development of the SHM System. It consists of a signal acquisition System and a Signal processing and management System. The signal acquisition System is composed of 14 acceleration sensors, 110 strain gauges and 4 inclination sensors, installed at the tripod foundation and the tower. It began to work in August 2007. In order to investigate the structural dynamic properties, extract efficient damage index and manage huge amounts of Vibration Signals and analysis results, an automated signal processing and management Software System is developed in LabVIEW® environment. It includes functions such as automated Operational Modal Analysis (OMA) on the basis of Stochastic Subspace Identification (SSI) method and poly-reference Least-Squares Complex Frequency Domain (p-LSCF) approach, investigation of environmental/operational effects on structural dynamic properties under operational conditions, features extraction using Principal Component Regression (PCR) and Multiple Linear Regression (MLR) as well as data/result management and visualization. Besides, this paper also presents variations of structural modal parameters of a wind turbine system under complex environmental/operational conditions. Comparison of modal parameters automatically extracted by SSI method and poly-reference p-LSCF approach indicates that the latter method provides more stable modal identification results ffom the viewpoint of long term OMA. Subsequently, the influences of temperature, wind velocity, rotation speed and nacelle direction on modal parameters are generally discussed. Finally, variations of indentified modal parameters during two years are presented. T2 - SHMII-6 - 6th International conference on structural health monitoring of intelligent infrastructure CY - Hong Kong, China DA - 09.12.2013 KW - Wind turbine KW - Vibration-based structural health monitoring system KW - Automated operational modal analysis KW - Environmental and operational effects KW - Feature extraction KW - Damage detection PY - 2013 SN - 978-962-367-768-4 SP - 1 EP - 10 AN - OPUS4-32973 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Hu, Wei-Hua A1 - Said, Samir A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Cunha, A. T1 - Continuous dynamic monitoring of structures N2 - This paper presents the development of a continuous dynamic monitoring System and its applications to different structures, with the purpose of understanding structural real behaviours under operational conditions and detecting early structural modifications. The first part of paper introduces a complete continuous dynamic System, consists of signal acquisition and communication, automated signal processing and management, investigation of the interaction between structures and its environmental/operational conditions, feature extraction and detection of structural modification. The rest of paper describes the applications of continuous dynamic monitoring System to different structures such as a wind turbine System and a highway bridge. T2 - 13th International symposium on structural engineering (ISSE'13) CY - Hefei, China DA - 24.10.2014 KW - Continuous dynamic monitoring KW - Automated system identification KW - Environmental/operational effects KW - Resonance KW - Feature extraction KW - Structural modification PY - 2014 SN - 978-7-09-042032-9 SP - 1922 EP - 1933 PB - Science Press AN - OPUS4-32971 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf ED - Schickert, G. T1 - Theoretische Ermittlung von Bauwerksschäden mit Hilfe dynamischer Methoden T2 - ZFP-BAU Symposium Berlin CY - Berlin, Germany DA - 1985-10-02 PY - 1986 SN - 3-88314-557-2 SP - 371 EP - 382 PB - DGZfP CY - Berlin AN - OPUS4-34026 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Fritzen, C.-P. A1 - Trappe, Volker A1 - Habel, Wolfgang T1 - Results and experiences from the research project IMO-WIND N2 - Following a modular concept an integrated monitoring system has been developed that includes all components of offshore wind turbines (OWEC). Using commercially available measurement equipments of the involved partners this system was tested at the wind turbine Multibrid M5000_2 in Bremerhaven. Additional results of the research project are findings on the use of embedded FBG sensors in rotor blades that allow condition assessments based on local information. Newly developed algorithms for the identification of external loads and damage characteristics of the structural components have been tested in operation. Developed methods for monitoring based structural assessment were used, which will be suitable to optimize structural maintenance works. T2 - DEWEK 2010 - 10th German wind energy conference CY - Bremen, Germany DA - 2010-11-17 KW - Offshore wind turbines KW - Integrated monitoring system KW - Data management KW - Design verification KW - Structural assessment KW - Limit values KW - Load identification KW - Data analysis KW - Damage identification KW - Rotor blades KW - Embedded sensors PY - 2010 IS - P11.8 SP - 1 EP - 4 PB - DEWI GmbH AN - OPUS4-23714 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Said, Samir T1 - IMO-WIND: Ein integrales Monitoring-System für Offshore-Windenergieanlagen T2 - Workshop "Windkraftanlagen - Sicherheit und Zuverlässigkeit" CY - Darmstadt, Deutschland DA - 2004-11-04 KW - Wind Energy KW - Offshore Structures KW - Damage Detection KW - Health Monitoring KW - Modal analysis KW - Design Improvement KW - Embedded Sensors KW - Offshore KW - Windenergieanlagen KW - Dynamische Untersuchungen KW - Dauerüberwachung KW - Schadensfrüherkennung KW - Sensorik PY - 2004 SP - 13 Seiten PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-4713 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Said, Samir T1 - Monitoring and assessment of structures under changed loading conditions T2 - SAMCO Summer Academy 2005 on Structural Assessment, Monitoring and control CY - Zell am See, Austria DA - 2005-09-05 KW - Monitoring KW - Assessment KW - Vibration PY - 2005 SP - 10 pages PB - Samco Network CY - Zell am See AN - OPUS4-11869 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Said, Samir T1 - Monitoring, Schadensfrüherkennung und Sensorik für Offshore-Windenergieanlagen T2 - 4. Symposium Offshore-Windenergie Bau- und umwelttechnische Aspekte CY - Hannover, Deutschland DA - 2005-09-27 KW - Monitoring KW - Zustandüberwachung KW - Schadensanalyse KW - Windlasten KW - Dynamik KW - Windenergieanlagen KW - Offshore KW - Bauliche Bewertung PY - 2005 VL - 4 IS - Beitrag 5 SP - 1(?) EP - 12(?) CY - Hannover AN - OPUS4-11871 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Said, Samir T1 - Offshore wind energy plants- a challenge for integrated structural health monitoring systems T2 - International Workshop on Lifetime Engineering of Civil Infrastructure CY - Ube Yamaguchi, Japan DA - 2005-11-09 KW - Offshore wind energy turbines KW - Structural health monitoring KW - Early damage detection KW - Control of dynamic behavior KW - Structural assessment PY - 2005 SP - 219 EP - 229 PB - Yamaguchi University CY - Ube Yamaguchi AN - OPUS4-12257 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Bäumer, Stephan T1 - Dynamic investigations at offshore wind turbines T2 - EVACES'07 - Experimental vibration analysis for civil engineering structures CY - Porto, Portugal DA - 2007-10-24 KW - Structural Health Monitoring KW - Damage Identification KW - Wind turbines PY - 2007 SN - 978-972-752-095-4 SP - 965 EP - 976 AN - OPUS4-16278 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -