TY - RPRT A1 - Plauk, Günther A1 - Kretschmann, Günter A1 - Rohrmann, Rolf-Günther T1 - Untersuchung des baulichen Zustandes und der Tragfähigkeit vorgespannter Riegel von Verkehrszeichenbrücken der Berliner Stadtautobahn N2 - Ergebnisse der an den Spannbetonriegeln durchgeführten Untersuchungen. Schwerpunkte waren Begutachtung des Zustandes der Betonoberflächen, Ermittlung der Betondruckfestigkeit, der Karbonatisierungstiefe, der Konzentration und Eindringtiefe von Chloriden, Ermittlung der Tragfähigkeit im Belastungsversuch, etc. T3 - BAM Forschungsberichtreihe - 152 KW - Autobahnwegweiserbrücken KW - Spannbeton KW - Spannbetonträger KW - Bewehrungskorrosion KW - Belastungsversuche KW - Schwingungsanalyse KW - Zerstörungsfreie Prüfung PY - 1988 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-2981 SN - 978-3-88314-796-6 SN - 0938-5533 VL - 152 SP - 1 EP - 94 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-298 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Rohrmann, Rolf-Günther A1 - Rudolphi, Reinald T1 - Bemessung und Optimierung beheizbarer Straßen- und Brückenbeläge N2 - Bemessung und Optimierung beheizbarer Straßen- und Brückenbeläge Beheizbare Straßen- und Brückenbeläge gewinnen im Hinblick auf bessere Verkehrssicherheit in besonders kritischen Bereichen Bedeutung. Darstellung realisierbarer Möglichkeiten und Systemen sowie ihrer optimalen Anwendung. T3 - BAM Forschungsberichtreihe - 53 PY - 1978 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-3979 SN - 0938-5533 VL - 53 SP - 1 EP - 76 PB - Bundesanstalt für Materialprüfung (BAM) CY - Berlin AN - OPUS4-397 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klement, Ernst A1 - Rudolphi, Reinald A1 - Rohrmann, Rolf T1 - Zur numerischen Abschätzung der stationären Wärmebeanspruchung von Dämmschichten in dreischaligen Hausschornsteinkonstruktionen PY - 1977 SN - 0341-2032 VL - 8 IS - 5 SP - 485 EP - 490 PB - Bauverlag BV CY - Gütersloh AN - OPUS4-1280 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmidt, Wolfgang ED - Feltrin, G. ED - Wenk, T. T1 - Dynamische Verfahren zur Sicherheitsüberwachung von Brückenbauwerken N2 - Referat: Nach dem gegenwärtigen Stand der Prognosen wird in den nächsten 10 bis 15 Jahren eine Zunahme des Güterverkehrs in Deutschland um 50 % angenommen. Im Jahre 2001 wurden 85 % aller transportierten Güter auf der Straße bewegt. Dies bedeutet, daß die vorhandenen Ingenieurbauwerke innerhalb der Verkehrsinfrastruktur mit zunehmendem Alter immer höhere Belastungen ertragen müssen. Zum anderen werden die zur Verfügung stehenden Mittel zum Ersatz dieser Infrastrukturbauwerke immer geringer. Eine aktuelle Bewertung dieser Bauwerke bezüglich ihrer Sicherheit und Gebrauchsfähigkeit erfordert deshalb zusätzliche Informationen hinsichtlich Art und Umfang eventuell vorhandener Schäden, deren Auswirkung auf die aktuelle Tragwirkung und Tragfähigkeit sowie Information über die vergangenen, gegenwärtigen und zukünftigen Lasteinwirkungen. T2 - D-A-CH-Tagung 2003 CY - Zürich, Schweiz DA - 2003-09-18 KW - Tragfähigkeit von Brücken KW - Dynamische Untersuchungen KW - Dauerüberwachung KW - Verkehrslasten KW - baulicher Zustand PY - 2003 UR - http://www.baufachinformation.de/aufsatz.jsp?ul=05029003231 SN - 3-908483-74-3 SP - 35 EP - 42 PB - SIA CY - Zürich AN - OPUS4-2850 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mehdianpour, Milad A1 - Rücker, Werner A1 - Rohrmann, Rolf T1 - Zur Tragfähigkeitsbewertung bestehender Bauwerke KW - Bestehende Bauwerke KW - Tragfähigkeitsbewertung KW - Bauwerksüberwachung KW - Normung KW - Sicherheitsbeurteilung KW - Bauzustandsanalyse KW - Risiko PY - 2004 SN - 0038-9145 SN - 1437-1049 SN - 0932-6375 VL - 73 IS - 4 SP - 236 EP - 241 PB - Ernst CY - Berlin AN - OPUS4-3493 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Last- und Zustandsüberwachung der Putlitzbrücke in Berlin-Moabit T2 - Fachtagung "Sonderkapitel aus dem Brücken- und Ingenieurbau" CY - Berlin, Deutschland DA - 2003-10-21 KW - Tragfähigkeit von Brücken KW - Dynamische Untersuchungen KW - Dauerüberwachung KW - Schwerlastverkehr PY - 2003 SN - 3-86509-043-5 SP - 100 EP - 108 PB - Wirtschaftsverl. NW, Verl. für neue Wissenschaft CY - Bremerhaven AN - OPUS4-2736 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Baeßler, Matthias T1 - Zustanduntersuchung und Dauerüberwachung von Bauwerken mit Hilfe modaler Parameter T2 - VDI-Schwingungstagung 2000 Experimentelle und rechnerische Modalanalyse sowie Identifikation dynamischer Systeme CY - Kassel, Germany DA - 2000-06-14 PY - 2000 AN - OPUS4-6562 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner T1 - Structural Health Monitoring today - Results from collected case stories T2 - 10th SAMCO Workshop CY - Berlin, Germany DA - 2005-04-28 PY - 2005 AN - OPUS4-7422 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner T1 - European Codes and Standards for Monitoring and Assessment T2 - 2nd SAMCO Workshop CY - Brussels, Belgium DA - 2003-09-30 PY - 2003 AN - OPUS4-4236 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner T1 - Data Management, European Data Reader & Format for Structural Health Monitoring T2 - 3rd SAMCO Workshop CY - Vienna, Austria DA - 2003-04-29 PY - 2003 AN - OPUS4-4237 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Dauerüberwachung von Bauerwerken T2 - Sonderkolloquium BAM-BMWA Projekte CY - Berlin, Germany DA - 2003-09-15 PY - 2003 AN - OPUS4-4238 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Last- und Verfahren zur Sicherheitsüberwachung der Putlitzbrücke in Berlin-Moabit T2 - Fachtagung "Sonderkapitel aus dem Brücken- und Ingenieurbau", BAM und Senat von Berlin CY - Berlin, Germany DA - 2003-10-22 PY - 2003 AN - OPUS4-4239 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Zustandsbeurteilung von Bauwerken mit Hilfe schwingungstechnischer Methoden - Ausgewählte Beispiele T2 - Workshop Bauwerksinspektion der BVFA CY - Vienna, Austria DA - 1987-09-21 PY - 1987 AN - OPUS4-6641 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Überwachung des Schädigungsprozesses eines Stahlbeton-Zweifeldträgers mit dynamischen Methoden T2 - 4. Tagung Dynamische Probleme - Modellierung und Wirkichkeit CY - Hanover, Germany DA - 1993-10-06 PY - 1993 AN - OPUS4-6642 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Rücker, Werner T1 - Tragfähigkeitsanalyse von Brückenbauwerken mit modaltechnischen Methoden T2 - 33. Forschungskolloquium Deutscher Ausschuss für Stahlbeton /DAfStb CY - Berlin, Germany DA - 1996-11-11 PY - 1996 AN - OPUS4-6644 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Modalananlyse großer Bauwerke und Anpassung von Rechenmodellen T2 - Workshof Modalnanalyse - Theorie und Praxis BAM CY - Berlin, Germany DA - 1997-03-03 PY - 1997 AN - OPUS4-6645 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner T1 - Surveillance of structural properties of large bridges using dynamic methods T2 - Proc. 6th International Conference on Structural Safety and Reliability CY - Innsbruck, Austria DA - 1993-08-09 PY - 1993 AN - OPUS4-6646 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Load and condition monitoring of a highway bridge in a continous manner T2 - Proc. IABSE Symposium Extending the Lifespan of Structures CY - San Francisco, CA, USA DA - 1995-08-23 PY - 1995 AN - OPUS4-6649 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Cantieni, R. A1 - Deger, Y. A1 - Pietrzko, S. T1 - Modal analysis of the westend bridge, experiment and finite element analysis T2 - Proc. International Symposium Non-Destructive Testing in Civil Engineering (NDT-CE) CY - Berlin, Germany DA - 1995-09-26 PY - 1995 AN - OPUS4-6652 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Methodik und Ergebnisse der Dauerüberwachung von Brückenbauwerken T2 - Workshop 'Temperaturbeanspruchung von Brücken' DB AG, FTZ4 CY - Munich, Germany DA - 2000-05-26 PY - 2000 AN - OPUS4-6655 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Rücker, Werner A1 - Baeßler, Matthias T1 - M.: Zustanduntersuchung und Dauerüberwachung von Bauwerken mit Hilfe modaler Parameter T2 - VDI-Schwingungstagung 2000 'Experimentelle und rechnerische Modalanalyse sowie Identifikation dynamischer Systeme CY - Kassel, Germany DA - 2000-06-14 PY - 2000 AN - OPUS4-6657 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - DGZfP-Merkblatt " Automatisierte Dauerüberwachung im Ingenieurbau" als Grundlage für Untersuchungen der BAM T2 - 14.Sitzung des GESA-AK-36 Bautechnik CY - Langen (Hesse), Germany DA - 2000-09-13 PY - 2000 AN - OPUS4-6658 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Theoretische Ermittlung von Bauwerksschäden mit Hilfe dynamischer Methoden T2 - 1. ZfP Bau-Symposium CY - Berlin, Germany DA - 1985-11-02 PY - 1985 AN - OPUS4-6638 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Dynamisches Verhalten eines Schienen-Schwellen-Verbundes auf elastischem Halbraum T2 - Rad-Schiene-Seminar, BAM CY - Berlin, Germany DA - 1986-02-18 PY - 1986 AN - OPUS4-6639 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Rücker, Werner T1 - Lokalisierung von Bauwerksschäden: Theorie und verifizierte Theorie T2 - Jahrestagung DGZfP CY - Münster, Germany DA - 1986-05-02 PY - 1986 AN - OPUS4-6640 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir T1 - IMO-WIND An integrated monitoring system for offshore wind energy turbines T2 - EURODYN 2005, 6th International Conference on Structural Dynamics CY - Paris, France DA - 2005-09-04 PY - 2005 AN - OPUS4-11326 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Hille, Falk T1 - Richtlinien für die Dauerüberwachung und die Bewertung von Ingenieurbauwerken T2 - TÜV Fachkolloquium "Erfahrungsberichte über die Überwachung von Ingenieurbauwerken im Straßen- und Schienennetz" CY - Leipzig, Germany DA - 2005-06-10 PY - 2005 AN - OPUS4-11328 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Baeßler, Matthias A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Rücker, Werner T1 - Structural Causes Of Temperature Affected Modal Data Of Civil Structures Obtained By Long Time Monitoring T2 - 18. Int. Modal Analysis Conference (IMAC) CY - San Antonio, TX, USA DA - 2000-02-07 PY - 2000 AN - OPUS4-6778 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Hille, Falk A1 - Rohrmann, Rolf A1 - Rücker, Werner ED - Parke, G. ED - Disney, P. T1 - Guideline for the assessment of existing structures T2 - 5th International Conference on Bridge Management, "Bridge Management 5, Inspection, maintenance, assessment and repair" CY - Guildford, England, UK DA - 2005-04-11 KW - Monitoring KW - Zustandsüberwachung KW - Dynamik KW - Brücken KW - Bauliche Bewertung PY - 2005 SN - 0-7277-3354-0 SP - 227 EP - 234 PB - Thomas Telford CY - London AN - OPUS4-11680 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir T1 - Offshore wind energy plants: A challenge for integrated structural health monitoring systems T2 - International Workshop on Lifetime Engineering of Civil Infrastructures CY - Ube, Japan DA - 2005-11-09 PY - 2005 AN - OPUS4-12294 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Stöhr, Stefan A1 - Link, Michael A1 - Rücker, Werner T1 - Damage detection based on static measurements on bridge structures T2 - 15th SAMCO Workshop CY - Zurich, Switzerland DA - 2006-03-30 PY - 2006 AN - OPUS4-12296 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Stöhr, Stefan A1 - Link, Michael A1 - Rücker, Werner T1 - Damage detection based on static measurements on bridge structures T2 - 24th International Modal Analysis Conference (IMAC) CY - St. Louis, MO, USA DA - 2006-01-30 PY - 2006 AN - OPUS4-12297 LA - eng 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 - GEN A1 - Stöhr, Stefan A1 - Link, M. A1 - Rohrmann, Rolf A1 - Rücker, Werner T1 - Damage detection based on static measurements on bridge structures T2 - 24th International Modal Analysis Conference (IMAC) CY - St. Louis, MO, USA DA - 2006-01-30 KW - Structural Health Monitoring KW - Damage Identification KW - Bridges PY - 2006 SN - 0-912053-94-1 SP - 12 pages PB - Society for Experimental Mechanics CY - St. Lous AN - OPUS4-12311 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf T1 - Automatische Langzeitüberwachung als Bestandteil von Bauwerks-Management-Systemen T2 - Fachtagung Sonderprobleme aus dem Brücken- und Ingenieurbau, BAM CY - Berlin, Germany DA - 2000-11-13 PY - 2000 AN - OPUS4-6662 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Limberger, Ernst A1 - Sachse, Regina T1 - Damage distribution of a RC footbridge evaluated by neural networks and classical update procedures University of Kassel T2 - International Conference on Structural System Identification CY - Kassel, Germany DA - 2001-07-05 PY - 2001 AN - OPUS4-6664 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Hille, Falk T1 - Guidelines for Monitoring and Assessment T2 - 7nd SAMCO Workshop CY - Rome, Italy DA - 2004-06-07 PY - 2004 AN - OPUS4-5400 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 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 - JOUR A1 - Klement, Ernst A1 - Rudolphi, Reinald A1 - Rohrmann, Rolf T1 - Zur numerischen Abschätzung der stationären Wärmebeanspruchung von Dämmschichten in dreischaligen Hausschornstein-Konstruktionen PY - 1977 SN - 0341-2032 VL - 8 IS - 5 SP - 485 EP - 490 PB - Bauverlag BV CY - Gütersloh AN - OPUS4-8653 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir A1 - Thöns, Sebastian A1 - Trappe, Volker T1 - Integrale Systeme für die Strukturüberwachung, Dauerüberwachung der Anlagenteile "Bauwerk" und "Rotorblätter" T2 - AMA Fachverband für Sensorik: Fokussierte Thementage "Sensorik und Messtechnik für die Windenergie" CY - Mainz, Germany DA - 2011-12-01 PY - 2011 AN - OPUS4-25135 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Hille, Falk T1 - Guidelines for monitoring and assessment - A SAMCO initiative as a basis for the international standardization T2 - 2nd International Conference on Structural Health Monitoring and Intelligent Infrastructure CY - Shenzhen, China DA - 2005-11-16 KW - Monitoring KW - Zustandsüberwachung KW - Schadensanalyse KW - Windlasten KW - Dynamik KW - Windenergieanlagen KW - Offshore KW - Bauliche Bewertung PY - 2006 SN - 0-415-39652-2 SP - 1671 EP - 1676 PB - Taylor & Francis CY - London AN - OPUS4-11566 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Thöns, Sebastian A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Faber, M.H. T1 - Bewertung der Ermüdungsfestigkeit von Baustrukturen in Offshore-Windenergie-Anlagen N2 - Das Bauwerk einer Windenergieanlage dient der Sicherstellung der Energieproduktion. Eine entsprechende Zuverlässigkeit der Struktur und deren permanente Bewertung und Unterhaltung ist dazu notwendig. In diesem Beitrag werden Möglichkeiten der Bewertung des für die Struktur wichtigen Schädigungsmechanismus Ermüdung sowie dessen Überwachung in Zusammenhang mit Schädigungsindikatoren aufgezeigt. Dabei wird auf strukturmechanische, werkstoffmechanische und probabilistische Modelle sowie auf Messdaten eines Prototyps einer OWEA zurückgegriffen. Ausgehend von der gesamtdynamischen Berechnung wird die Zuverlässigkeit gemäß der Auslegung für den Schädigungsmechanismus Ermüdung durch ein Wöhlerlinienmodell berechnet. Damit werden ermüdungssensible Komponenten der Struktur identifiziert. Schädigungsindikatoren zur Überwachung der Ermüdungsfestigkeit werden auf Grundlage schädigungs-äquivalenter Dehnungen vorgestellt. Fatigue assessment of support structures for offshore wind energy converters. The structure of wind energy converters secures a reliable energy production. Hence an adequate reliability of the structure and additionally permanent assessment and maintenance is required. Within this paper methods for the assessment of the important damage mechanism fatigue in combination with monitoring of the fatigue reliability utilizing damage indicators are proposed. These methods comprise structural system, material degradation and probabilistic models as well as monitoring data of an offshore wind energy converter prototype. The structural reliability of the structure as designed is calculated based on an overall dynamic analysis using a SN-approach. Herewith fatigue sensitive components are identified. Damage indicators for monitoring the fatigue reliability based on damage equivalent strains are presented. KW - Bewertung KW - Offshore-Windenergie KW - Ermüdung KW - Strukturspannungskonzept KW - Zuverlässigkeit KW - Schadensindikatoren KW - Integrated Monitoring System KW - Damage Identification KW - Load Monitoring KW - Wind turbines PY - 2008 U6 - https://doi.org/10.1002/stab.200810076 SN - 0038-9145 SN - 1437-1049 SN - 0932-6375 VL - 77 IS - 9 SP - 630 EP - 638 PB - Ernst CY - Berlin AN - OPUS4-17977 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rohrmann, Rolf A1 - Rücker, Werner ED - Soize, C. ED - Schueller, G. T1 - IMO-WIND: An integrated monitoring system for offshore wind energy turbines N2 - To ensure a high operational reliability of future offshore wind conversion systems (OWEC) with economically acceptable repair and maintenance efforts, comprehensive diagnosis and supervision concepts are required. Automatic monitoring systems will be an essential part of such concepts. Within the scope of the IMO-WIND research project BAM, the University of Siegen and six industrial companies are involved in developing an integrated monitoring system for all components (structure, blades and machinery) of OWEC. This contribution describes the approach and the emphases of the research project. T2 - IMO-WIND: An integrated monitoring system for offshore wind energy turbines CY - Paris, France DA - 2005-09-04 KW - Monitoring KW - Zustandsüberwachung KW - Schadensanalyse KW - Windlasten KW - Dynamik KW - Windenergieanlagen KW - Offshore KW - Bauliche Bewertung PY - 2005 SN - 90-5966-033-1 VL - 1 SP - 287 EP - 292 PB - Millpress CY - Rotterdam AN - OPUS4-10912 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Auersch, Lutz A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir T1 - Fahrzeug-Fahrweg-Untergrund-Umgebung: theoretische, rechnen- und meßtechnische Untersuchungen T2 - VDI-Tagung CY - Würzburg, Deutschland DA - 1987-06-01 PY - 1987 SN - 3-18-090635-9 SN - 0083-5560 N1 - Serientitel: VDI-Berichte – Series title: VDI-Berichte IS - 635 SP - 59 EP - 87 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-11511 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rücker, Werner A1 - Baeßler, Matthias A1 - Rohrmann, Rolf ED - Rackwitz, F. T1 - Experimentelle Untersuchungen zu Schotterfahrwegen auf Brücken N2 - Auf Schnellfahrstrecken können Brückentragwerke durch die Überfahrt von Zügen zu Resonanzschwingungen angeregt werden. Dies führt ungünstigstenfalls zu übermäßigen Beschleunigungen des Brückendecks infolge derer sich das Schotterbett destabilisiert. In diesem Beitrag wird die Wirkung von vertikalen Brückenschwingungen auf den Schotteroberbau anhand experimenteller Untersuchungen beschrieben. T2 - Festschrift zum 60. Geburtstag von Univ.-Professor Dr.-Ing. habil. Stavros A. Savidis KW - Schotteroberbau KW - Beschleunigung KW - Eisenbahnbrücken KW - Gleislage KW - Destabilisierung KW - Unterschottermatten PY - 2006 SN - 3-540-27425-1 U6 - https://doi.org/10.1007/3-540-27438-3_26 SP - 397 EP - 414 PB - Springer CY - Berlin AN - OPUS4-11493 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmid, Wolfgang ED - Watanabe, E. ED - Frangopol, D. T1 - Health monitoring of a steel bridge under heavy load traffic T2 - IABMAS '04 ; 2nd International Conference on Bridge Maintenance, Safety and Management CY - Kyoto, Japan DA - 2004-10-18 KW - Bridge Assessment KW - Heavy Load Traffic KW - Damage Detection KW - Structural Health Monitoring KW - Modal Analysis PY - 2004 SN - 90-5809-680-7 PB - Balkema CY - Leiden AN - OPUS4-4841 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 - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Thöns, Sebastian T1 - Integrated Monitoring Systems for Offshore Wind Turbines T2 - 6th International Workshop on Structural Health Monitoring CY - Stanford, USA DA - 2007-09-11 KW - Integrated Monitoring System KW - Damage Identification KW - Load Monitoring KW - Wind turbines PY - 2007 SP - 1 EP - 8 AN - OPUS4-16280 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Aufgaben der Dauerüberwachung am Beispiel von Betonbrücken und Windenergieanlagen T2 - Seminar "Messen im Bauwesen", BAM CY - Berlin, Germany DA - 2007-03-16 PY - 2007 AN - OPUS4-14750 LA - deu 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 - Experimental Vibration Anylysis for Civil Engineering Structures (EVACES´07) CY - Oporto, Portugal DA - 2007-10-24 PY - 2007 AN - OPUS4-16418 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Konzepte und Aufgaben der Dauerüberwachung von Ingenieurbauwerken T2 - Universität Hannover, Geodätisches Institut CY - Hanover, Germany DA - 2007-06-23 PY - 2007 AN - OPUS4-16419 LA - deu 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 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir T1 - IMO-WIND: Ein integrales Monitoring-System für Offshore-Windenergieanlagen T2 - Workshop "Windkraftanlagen - Sicherheit und Zuverlässigkeit", VDI Wissensforum CY - Darmstadt, Germany DA - 2004-11-04 PY - 2004 AN - OPUS4-4946 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - 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 - GEN A1 - Thöns, Sebastian A1 - Faber, M.H. A1 - Rücker, Werner A1 - Rohrmann, Rolf ED - Martorell, S. ED - et al., T1 - Assessment and monitoring of reliability and robustness of offshore wind energy converters T2 - ESREL 2008 CY - Valencia, Spain DA - 2008-09-22 KW - Structural reliability KW - Robustness KW - Monitoring KW - Risk KW - Wind energy converter PY - 2008 SN - 978-0-415-48513-5 SP - 1567 EP - 1572 PB - Taylor & Francis CY - London, UK AN - OPUS4-18565 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Thöns, Sebastian A1 - Said, Samir T1 - Design and Operation of Integrated Monitoring Systems for Offshore Wind Turbines T2 - 9th German Wind Energy Conference, DEWEK 2008 CY - Bremen, Germany DA - 2008-11-26 PY - 2008 AN - OPUS4-18608 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Thöns, Sebastian A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Ergebnisse der Dauerüberwachung an einem Prototypen von Offshore-Windenergieanlagen T2 - 3. VDI-Fachtagung - Baudynamik CY - Kassel, Deutschland DA - 2009-05-14 KW - Integrated Monitoring System KW - Offshore wind turbines KW - Assessment KW - Damage identification KW - Load monitoring PY - 2009 SN - 978-3-18-092063-4 SN - 0083-5560 VL - 2063 SP - 455 EP - 466 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-19795 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Thöns, Sebastian A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Ergebnisse der Dauerüberwachung an einem Prototyp von Offshore-Windenergieanlagen T2 - 3. VDI-Fachtagung Baudynamik CY - Kassel, Germany DA - 2009-05-14 PY - 2009 AN - OPUS4-19773 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Thöns, Sebastian A1 - Rücker, Werner A1 - Bicker, S. A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Structural Investigations and Monitoring Results on a Prototype of Offshore Wind Turbines of Multibrid M 5000 Series T2 - DEWEK 2010, 10th German Wind Energy Conference CY - Bremen, Germany DA - 2010-11-17 PY - 2010 AN - OPUS4-22733 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner A1 - Rohrmann, Rolf A1 - Auersch, Lutz A1 - Hille, Falk A1 - Thöns, Sebastian T1 - Assessment and Damage Detection for Offshore Wind Turbines and Infrastructures T2 - IRIS - Current Praxis Workshop CY - Thessaloniki, Greece DA - 2009-03-30 PY - 2009 AN - OPUS4-20663 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Rücker, Werner A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Rohrmann, Rolf T1 - Zustandsüberwachung der Gärtnerplatzbrücke in Kassel unter Verwendung gemessener Einflusslinien T2 - 3. VDI-Fachtagung - Baudynamik CY - Kassel, Deutschland DA - 2009-05-14 KW - Schadensanalyse KW - Neigungseinflusslinie KW - Fußgängerbrücke KW - Ultrahochfester Beton PY - 2009 SN - 978-3-18-092063-4 SN - 0083-5560 VL - 2063 SP - 81 EP - 91 PB - VDI-Verl. CY - Düsseldorf AN - OPUS4-19861 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Thöns, Sebastian A1 - Said, Samir T1 - Design and operation of integrated monitoring systems for offshore wind turbines N2 - To ensure a high operational reliability of future generations of offshore wind conversion systems (OWEC) with economically acceptable repair and maintenance efforts, comprehensive diagnosis and supervision concepts are required. Automatic monitoring systems will be an essential part of such concepts. Because of the fact, that during operation there will be static and dynamic interaction between the components 'structure', 'machinery' and 'blades' it is necessary to develop the monitoring techniques in an overall concept. These monitoring systems are supposed to be applied for the design and testing as well as for the operation and maintenance phases. The used methods are focused on the design requirements for the structure, which are stated in the respective standards and certification guidelines. For the validation of the design, methods are specified which would be also applicable for SHM in the operating condition, e.g. for the evaluation of the structural conditon possibly after the occurrence of damages or changes. The further task consists in the realization of condition monitoring for all components, aiming at early damage detection and the observation of the damage development and its evaluation. Here the task consists of determining with assessment procedures the optimum time for maintenance actions to be carried out. T2 - DEWEK 2008 - 9th German wind energy conference CY - Bremen, Germany DA - 2008-11-26 KW - Integrated monitoring system KW - Offshore wind turbines KW - Assessment KW - Damage identification KW - Load monitoring PY - 2008 SP - 1 EP - 4(?) AN - OPUS4-19872 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Thöns, Sebastian A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Rücker, Werner A1 - Bicker, S. T1 - Design-Verifikation von Offshore-Windenergieanlagen mit Hilfe integraler Überwachungssysteme T2 - Finales Statusseminar zum Forschungsvorhaben IMO-WIND CY - Berlin, Germany DA - 2009-10-01 PY - 2009 AN - OPUS4-20077 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Rohrmann, Rolf A1 - Thöns, Sebastian A1 - Rücker, Werner T1 - Integrated monitoring of offshore wind turbines - requirements, concepts and experiences N2 - Wind turbines on offshore sites (OWECs) are subjected to combined loads from wind and waves. These dynamic loads, with a frequency content within the range of the natural frequencies of the structures, cause fatigue-effective stresses in the substructures of wind turbines. Therefore, the examination of natural frequencies is an important part within the design process of wind turbines. The quality of the numerical models for such calculations is of great importance, since the certification guidelines permit only small uncertainties in modal analysis results. The accuracy of the parameters of the numerical model can only be achieved through a comparison of simulation results with corresponding test results. Therefore, it is necessary to measure the dynamic behaviour of all components of the wind turbines simultaneously. This is true not only for the design verification, but also for monitoring the OWECs in operation. The potential of integrated systems for monitoring-based maintenance optimisation should thus be used. KW - Offshore wind turbines KW - Integrated monitoring system KW - Structural assessment KW - Damage indicators KW - Dynamic loads KW - Data management PY - 2010 U6 - https://doi.org/10.1080/15732470903068706 SN - 1573-2479 SN - 1744-8980 VL - 6 IS - 5 SP - 575 EP - 591 PB - Taylor & Francis CY - London AN - OPUS4-21452 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Thöns, Sebastian A1 - Schmid, Wolfgang A1 - Rücker, Werner T1 - Results from monitoring and assessment of offshore wind turbines T2 - Eurodyn 2011, 8th International Conference on Structural Dynamics CY - Leuven, Belgium DA - 2011-07-04 PY - 2011 AN - OPUS4-24082 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir A1 - Thöns, Sebastian A1 - Schmid, Wolfgang T1 - Monitoring Loads and Operational Demands at Wind Power Plants - Interaction between Tower and Rotor Blades T2 - 3rd Technical Conference WindTurbine Rotor Blades CY - Essen, Germany DA - 2011-06-28 PY - 2011 AN - OPUS4-24083 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Thöns, Sebastian T1 - Monitoring komplexer Anlagen am Beispiel von Offshore-Windenergieanlagen T2 - VDI/VDE Expertenforum 2011, Strukturmonitoring und Zustandsüberwachung CY - Nuremberg, Germany DA - 2011-06-07 PY - 2011 AN - OPUS4-23996 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Rücker, Werner T1 - Forschungsprojekt IMO-WIND T2 - Öffentliches Status-Seminar zum Forschungsprojekt IMO-WIND CY - Bremen, Germany DA - 2006-11-21 PY - 2006 AN - OPUS4-18629 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rohrmann, Rolf A1 - Thöns, Sebastian A1 - Rücker, Werner A1 - Bicker, S. A1 - Said, Samir A1 - Schmid, Wolfgang T1 - Structural investigations and monitoring results on a prototype of offshore wind turbines of multibrid M5000 series N2 - The concept and technical details of the implementation of the developed integrated monitoring system within the IMO-WIND project are presented. The tasks of the components of the system and its requirements are described. Selected results from the continuous monitoring during operation of the plant M5000_2 regarding the task design verification and dynamic structural analysis are given. T2 - DEWEK 2010 - 10th German wind energy conference CY - Bremen, Germany DA - 2010-11-17 KW - Integrated monitoring system KW - Offshore wind turbines KW - Design verification KW - Structural assessment KW - Limit values KW - Load transfer KW - Data management KW - Dynamic analysis KW - Rotor blades KW - Embedded sensors PY - 2011 IS - S03 SP - 1 EP - 5 PB - DEWI GmbH AN - OPUS4-23712 LA - eng 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 - Rohrmann, Rolf A1 - Said, Samir A1 - Schmid, Wolfgang A1 - Thöns, Sebastian A1 - Bicker, S. A1 - Rücker, Werner ED - De Roeck, G. ED - Degrande, G. ED - Lombaert, G. ED - Müller, G. T1 - Results from monitoring and assessment of offshore wind turbines N2 - To ensure a high operational reliability of offshore wind turbines (OWEC) with economically acceptable repair and maintenance efforts, comprehensive diagnosis and supervision concepts are required. Automatic monitoring Systems will be an essential part of such concepts. Because of the fact, that during Operation there will be static and dynamic interaction between the components ‘structure’, ‘machinery’ and ‘blades’ it is necessary to develop the monitoring techniques in an overall concept. These monitoring Systems are supposed to be applied for the design and testing as well as for the Operation and maintenance phases. The knowledge of the dynamic behavior of wind turbines is important both for the design and for a safe Operation. The available monitoring data from a period of three years, allow first conclusions on the long-term Operation of such Systems in terms of quality requirements to the instrumentation to the structure and the rotor blades T2 - EURODYN 2011 - 8th International conference on structural dynamics CY - Leuven, Belgium DA - 04.07.2011 KW - Integrated monitoring system KW - Offshore wind turbines KW - Structural assessment KW - Limit values KW - Measurement hardware KW - Data management KW - Embedded FBG sensors KW - Data analysis KW - Damage detection KW - Rotor blades PY - 2011 SN - 978-90-760-1931-4 IS - MS25 SP - 3450 EP - 3456 AN - OPUS4-24293 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hu, Wei-Hua A1 - Thöns, Sebastian A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Rücker, Werner T1 - Vibration-based structural health monitoring of a wind turbine system. Part I: Resonance phenomenon N2 - This paper is focused on a resonance phenomenon of a wind turbine system in 5 MW class, on the basis of dynamic signals acquired continuously from the tubular tower under normal operational conditions during two years. Firstly, technique specifications of the wind turbine system are introduced and a finite element model is developed to characterize the structural dynamic properties. The following part describes the continuous dynamic monitoring system integrated with an automated operational modal analysis procedure using the poly-reference Least Squares Complex Frequency domain (p-LSCF) method. Subsequently, variations and mutual relationships of environmental/operational factors such as vibration amplitude, temperature, wind speed, rotation speed of blades, pitch angle and nacelle direction are also presented. Finally, significant resonance is observed due to the fundamental frequency of the tower matching with the harmonic frequency induced by the rotation of three blades. As the rotation speed of rotor approaches to 8 rpm, the vibration amplitude of the tower increases significantly and the corresponding damping value decreases. With the further rising wind velocity, the rotation speed of blades stops increasing and the input energy just contribute to accumulate the vibration amplitude of tower. Such observation indicates the Sommerfeld effect that aggravates the resonance phenomenon. A vibration control device is necessary to minimize the excessive structural responses. A companion paper will further discuss the environmental/operational effects on dynamic properties of the wind turbine system under the operational conditions. KW - Vibration KW - Structural health monitoring KW - Wind turbine KW - Automated operational modal analysis KW - Resonance KW - Sommerfeld effect PY - 2015 U6 - https://doi.org/10.1016/j.engstruct.2014.12.034 SN - 0141-0296 VL - 89 SP - 260 EP - 272 PB - Elsevier Ltd. CY - Oxford AN - OPUS4-32878 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hu, Wei-Hua A1 - Thöns, Sebastian A1 - Rohrmann, Rolf A1 - Said, Samir A1 - Rücker, Werner T1 - Vibration-based structural health monitoring of a wind turbine system. Part II: Environmental/operational effects on dynamic properties N2 - The second part of these companion papers mainly researches environmental/operational influences on structural dynamic properties under normal operational conditions during two years, in order to extract a statistical based damage-sensitive indicator for health monitoring of a wind turbine system. The correlation analyses between experimental identified frequencies, damping values as well as mode shapes and environmental/operational factors such as rotation speed of blades, wind speed, pitch angle, temperature and nacelle direction are presented. It is observed that the frequency estimates are influenced by the nacelle position, the activation of rotor, the rotation speed of blades and the wind speed as well as the temperature. Regarding to the damping estimates, they are mainly associated with variation of the aerodynamic damping due to the increasing wind speed. Besides, the resonance phenomenon is also observed in higher modes. The harmonic frequencies due to blades passing by tower are found and the corresponding damping value decreases. Moreover, the mode shapes in some modes are strongly affected by the position of the nacelle. Subsequently, two types of simulated damage including the reduction of stiffness in both the rotor blade and the tubular tower are successfully detected by applying the Principal Component Analysis (PCA) based methods to these temperature-sensitive frequency estimates. Comparison of change of the extracted health features indicates that they are more sensitive with the tower damage. KW - Vibration KW - Structural health monitoring KW - Wind turbine KW - Environmental/operational effects KW - Modal properties KW - Principal Component Analysis KW - Novelty analysis KW - Damage detection KW - Sommerfeld effect KW - Automated operational modal analysis KW - Resonance PY - 2015 U6 - https://doi.org/10.1016/j.engstruct.2014.12.035 SN - 0141-0296 VL - 89 SP - 273 EP - 290 PB - Elsevier Ltd. CY - Oxford AN - OPUS4-32879 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 - 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 - 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. A1 - Rogge, Andreas ED - De Stefano, A. T1 - Vibration-based structural health monitoring of a highway bridge based on continuous dynamic measurements during 14 years N2 - This paper presents the continuous dynamic measurements of an aging prestressed box-beam bridge during the period from 2000 to 2013, which consists of dynamic properties and environmental/operational factors, as well as the Variation of the extracted health features after removing the environmental/operational effects. Firstly, the variations of frequency estimates, temperatures and traffic loads from 2000 to 2013 are described. Subsequently, correlation analysis between them indicates the nonlinear influences of the temperature on the frequency estimates. The Multiple Linear Regression (MLR) method is used to remove the environmental/operational effects and the health index is proposed by performing the Novelty Detection analysis of the residual errors. Finally, the variations of the health index may indicate clear structural modifications that can be also characterized by the long term monitoring of the dynamic strain in the prestressed cable. T2 - SHMII-7 - 7th International conference on structural health monitoring of intelligent infrastructure CY - Torino, Italy DA - 01.07.2015 KW - Westend bridge PY - 2015 SP - 1 EP - 12 AN - OPUS4-35124 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hu, Wei-Hua A1 - Tang, De-Hui A1 - Teng, Jun A1 - Said, Samir A1 - Rohrmann, Rolf T1 - Structural health monitoring of a prestressed concrete bridge based on statistical pattern recognition of continuous dynamic measurements over 14 years N2 - This work describes a vibration-based structural health monitoring of a prestressed-concrete box girder bridge on the A100 Highway in Berlin by applying statistical pattern recognition technique to a huge amount of data continuously collected by an integrated monitoring system during the period from 2000 to 2013. Firstly, the general condition and potential damage of the bridge is described. Then, the dynamic properties are extracted from 20 velocity sensors. Environmental variability captured by five thermal transducers and traffic intensity approximately estimated by strain measurements are also reported. Nonlinear influences of temperature on natural frequencies are observed. Subsequently, the measurements during the first year are used to build a baseline health index. The multiple linear regression (MLR) method is used to characterize the nonlinear relationship between natural frequencies and temperatures. The Euclidean distance of the residual errors is calculated to build a statistical health index. Finally, the indices extracted from the following years gradually deviate; which may indicate structural deterioration due to loss of prestress in the prestressed tendons. KW - Bridge KW - Structural health monitoring KW - Statistical pattern recognition KW - Temperature effect PY - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-468126 SN - 1424-8220 VL - 18 IS - 12 SP - 4117, 1 EP - 28 PB - MDPI CY - 4052 Basel, Schweiz AN - OPUS4-46812 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Teng, Jun A1 - Tang, De-Hui A1 - Zhang, Xiao A1 - Hu, Wei-Hua A1 - Said, Samir A1 - Rohrmann, Rolf G. T1 - Automated modal analysis for tracking structural change during construction and operation phases N2 - The automated modal analysis (AMA) technique has attracted significant interest over the last few years, because it can track variations in modal parameters and has the potential to detect structural changes. In this paper, an improved density-based spatial clustering of applications with noise (DBSCAN) is introduced to clean the abnormal poles in a stabilization diagram. Moreover, the optimal system model order is also discussed to obtain more stable poles. A numerical Simulation and a full-scale experiment of an arch bridge are carried out to validate the effectiveness of the proposed algorithm. Subsequently, the continuous dynamic monitoring system of the bridge and the proposed algorithm are implemented to track the structural changes during the construction phase. Finally, the artificial neural network (ANN) is used to remove the temperature effect on modal frequencies so that a health index can be constructed under operational conditions. KW - Automated Modal Analysis for Tracking Structural Change during Construction and Operation Phases PY - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-475116 UR - https://www.mdpi.com/1424-8220/19/4/927/pdf SN - 1424-8220 VL - 19 IS - 4 SP - 927, 1 EP - 23 PB - MDPI AG CY - Basel, Switzerland AN - OPUS4-47511 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -