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- Integrated monitoring system (3)
- Offshore wind turbines (3)
- Value of information (3)
- Condition monitoring (2)
- Damage detection (2)
- Data management (2)
- Fire (2)
- Limit values (2)
- Risk (2)
- Rotor blades (2)
- SHM (2)
- Structural assessment (2)
- Structural integrity management (2)
- Structural reliability (2)
- Tunnel (2)
- Assessment (1)
- Automated operational modal analysis (1)
- Bauwerksüberwachung (1)
- Bayesian updating (1)
- Bayesian updating of measurement uncertainties (1)
- Bridge resistance model (1)
- CFD (1)
- Comparative study (1)
- Continuous dynamic monitoring (1)
- Cost (1)
- Cost benefit analysis (1)
- Damage Identification (1)
- Damage detection system (1)
- Damage identification (1)
- Data analysis (1)
- Design verification (1)
- Dynamic analysis (1)
- Embedded FBG sensors (1)
- Embedded sensors (1)
- Evacuation (1)
- FED (1)
- Fatigue (1)
- Fatigue safety (1)
- Fractional effective dose (1)
- Inspection (1)
- Inspection planning (1)
- Integrated Monitoring System (1)
- Lebensdauerverlängerung (1)
- Levelized cost of energy (1)
- Life cycle (1)
- Life cycle extension (1)
- Load Monitoring (1)
- Load monitoring (1)
- Load transfer (1)
- Measurement hardware (1)
- Measurement uncertainty (1)
- Messunsicherheit (1)
- Metamodel (1)
- Modal analysis (1)
- Offshore wind (1)
- Offshore wind turbine (1)
- Operation (1)
- Operation management (1)
- Orthotropic steel bridge deck (1)
- Posterior utilities (1)
- Probabilistic decision analysis (1)
- Probability od detection (1)
- Proof load testing (1)
- Quantification (1)
- Reconstruction of stress resultants (1)
- Reliability (1)
- Reliability updating (1)
- Resonance (1)
- Risk assessment (1)
- Rotor blade (1)
- SHM information (1)
- Safety (1)
- Sensitivity analysis (1)
- Service life performance (1)
- Smoke (1)
- Steel bridge deck (1)
- Stochastic subspace (1)
- Strain measurements (1)
- Structural monitoring (1)
- Structural reliability and risks (1)
- System (1)
- Test blade (1)
- Tower-nacelle system (1)
- Toxicity (1)
- Tragwerkszuverlässigkeit (1)
- Uncertainty (1)
- Wind turbine (1)
- Wind turbines (1)
Organisationseinheit der BAM
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.
Structural health monitoring of wind turbine blades by strain measurement and vibration analysis
(2011)
Wind turbine blades have to withstand a high number of load cycles in mostly hard weather conditions over 20 years. In a research project BAM and several partners have designed, evaluated and tested a condition monitoring system for all parts of a wind turbine. At a rotorblade with a length of 58 m fibre bragg grating sensors were applied for in-service strain measurement. Additionally a complex test rig was designed to enable real biaxial loading conditions at a representative test rotor blade to simulate the mechanical loading conditions in the lab. In this test blade with a length of 8 m also fibre bragg grating sensors were implemented to determine their influences for the structure and the condition monitoring system. Vibration measurements were carried out at different test phases. The results were compared with finite element strain and modal analysis.
Risikobasierte Überwachungsverfahren zur Lebensdauerverlängerung von bestehenden und neuen Bauwerken
(2011)
Diese Veröffentlichung enthält Konzepte zur Lebensdauerverlängerung von Bauwerken auf der Grundlage der Tragwerkszuverlässigkeitstheorie. Es werden aktuelle Forschungsergebnisse aus nationalen und europäischen Forschungsvorhaben vorgestellt. Den Schwerpunkt bildet die Verwendung von Bauwerksüberwachungsdaten unter Berücksichtigung von Messunsicherheiten zur Bestimmung der Tragwerkszuverlässigkeit. Dazu wird ein neuer Ansatz zur Bestimmung der A-posteriori Messunsicherheit vorgestellt. Es wird gezeigt, aufgrund welcher Eigenschaften der verwendeten probabilistischen Modelle die Zuverlässigkeit im Grenzzustand der Ermüdung in Bezug auf eine Lebensdauerverlängerung beeinflusst werden kann.
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.
This paper describes a structural reliability analysis utilizing monitoring data in the ultimate limit state with consideration of the uncertainties of the monitoring procedure. For this purpose the uncertainties of the monitoring data are modeled utilizing a new framework for the determination of measurement uncertainties. The approach is based on a process equation and Statistical models of observations for the derivation of a posterior measurement uncertainty by Bayesian updating. This facilitates the quantification of a measurement uncertainty using all available data of the measurement process. For the reliability analysis in the ultimate limit state, monitoring data can be utilized as a loading model Information and as proof loading, i.e. resistance model Information. Both approaches are discussed with generic examples and it is shown that the modeling of monitoring data in a reliability analysis can result in a reduction of uncertainties and as a consequence in the reduction of the probability of failure. Furthermore, the proof loading concept is developed further to account for the uncertain characteristic of proof loading due to the measurement uncertainties which is consistent with the framework for the determination of measurement uncertainties. These approaches and findings can be utilized for the assessment of structures for life cycle extension and the design of monitoring Systems.
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
The fatigue deterioration modeling for welded steel structures subjected to high cycle fatigue is presented in the current document. The aim of this paper is to formulate approaches based on actual Research results for the phases fatigue crack initiation, fatigue propagation and fatigue failure. The physical characteristics of the approaches are discussed in combination with the associated uncertainties and the probabilistic modeling of this time variant reliability problem. The fatigue deterioration modeling documented here serve as a basis for a reliability-based approach to inspection planning.