Filtern
Erscheinungsjahr
Dokumenttyp
- Beitrag zu einem Tagungsband (29)
- Zeitschriftenartikel (19)
- Beitrag zu einem Sammelband (2)
- Buchkapitel (1)
- Corrigendum (1)
- Dissertation (1)
Sprache
- Englisch (53) (entfernen)
Schlagworte
- Value of information (11)
- Structural reliability (6)
- Fatigue (5)
- Condition monitoring (4)
- Damage detection (4)
- Integrated monitoring system (4)
- Monitoring (4)
- Offshore wind turbines (4)
- Structural health monitoring (4)
- Structural integrity management (4)
- Wind turbine (4)
- Automated operational modal analysis (3)
- Data management (3)
- Decision theory (3)
- Offshore wind (3)
- Offshore wind turbine (3)
- Resonance (3)
- Risk (3)
- SHM (3)
- Structural assessment (3)
- Cost benefit analysis (2)
- Deterioration (2)
- Finite element analysis (2)
- Fire (2)
- Fracture mechanics (2)
- Inspection (2)
- Integrity management (2)
- Limit values (2)
- Predictive maintenance (2)
- Reliability (2)
- Risk assessment (2)
- Rotor blades (2)
- Sommerfeld effect (2)
- Tunnel (2)
- Vibration (2)
- Wind power (2)
- Wind turbine support structure (2)
- Assessment (1)
- Bayesian analysis (1)
- Bayesian probability (1)
- Bayesian updating (1)
- Bayesian updating of measurement uncertainties (1)
- Bayesian updating of stress ranges (1)
- Blade (1)
- Bridge resistance model (1)
- CFD (1)
- Comparative study (1)
- Continuous dynamic monitoring (1)
- Cost (1)
- Damage Identification (1)
- Damage detection system (1)
- Damage detection systems (1)
- Damage detection uncertainty (1)
- Damage identification (1)
- Damage indicators (1)
- Daniels systems (1)
- Data analysis (1)
- Decision analysis (1)
- Decision optimality (1)
- Decision tree (1)
- Design verification (1)
- Deteriorating structures (1)
- Dynamic Bayesian Network (1)
- Dynamic analysis (1)
- Dynamic loads (1)
- Embedded FBG sensors (1)
- Embedded sensors (1)
- Environmental/operational effects (1)
- Evacuation (1)
- FED (1)
- Failure analysis (1)
- Fatigue safety (1)
- Fractional effective dose (1)
- Icing conditions (1)
- Inspection planning (1)
- Integrated Monitoring System (1)
- Levelized cost of energy (1)
- Life cycle (1)
- Life cycle cost (1)
- Load Monitoring (1)
- Load monitoring (1)
- Load transfer (1)
- Measurement hardware (1)
- Measurement uncertainty (1)
- Metamodel (1)
- Modal analysis (1)
- Modal properties (1)
- Model basis (1)
- Monitoring strategy (1)
- Monopile support structure (1)
- Novelty analysis (1)
- Offshore installations (1)
- Operation (1)
- Operation management (1)
- OperationRisk (1)
- Orthotropic steel bridge deck (1)
- Orthotropic steel deck (1)
- Posterior fatigue reliability (1)
- Posterior utilities (1)
- Pre‐construction proof loading (1)
- Pre‐posterior decision analysis (1)
- Principal Component Analysis (1)
- Probabilistic decision analysis (1)
- Probability (1)
- Probability od detection (1)
- Probability of damage indication (1)
- Proof load testing (1)
- Proof loading (1)
- Quantification (1)
- Reconstruction of stress resultants (1)
- Reliability updating (1)
- Risk analysis (1)
- Risk and decision analysis (1)
- Risk mitigation strategies (1)
- Robustness (1)
- Rotor blade (1)
- Rotors (1)
- Rskbased inspection (1)
- SHM information (1)
- Safety (1)
- Sensitivity (1)
- Sensitivity analysis (1)
- Service life performance (1)
- Shells (structures) (1)
- Significance and effectiveness (1)
- Smoke (1)
- Steel bridge deck (1)
- Stochastic subspace (1)
- Strain measurements (1)
- Strain measurements of wind turbine support structures (1)
- Structural Integrity and Risk Management (1)
- Structural condition assessment (1)
- Structural design optimization (1)
- Structural engineering (1)
- Structural health monitoring information model (1)
- Structural health monitoring systems arrangement strategy (1)
- Structural performance (1)
- Structural reliability and risks (1)
- Structural systems (1)
- Subset simulation (1)
- Support structure (1)
- System (1)
- Terrorist attacks (1)
- Test blade (1)
- Tower-nacelle system (1)
- Toxicity (1)
- Ultimate limit state (1)
- Uncertainty (1)
- Utility and decision theory (1)
- Value of Information (1)
- Value of action analysis (1)
- Value of information and action (1)
- Weld fatigue (1)
- Wind energy converter (1)
- Wind turbines (1)
Organisationseinheit der BAM
Paper des Monats
- ja (1)
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.
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.
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.
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