References of "Morato Dominguez, Pablo Gabriel"
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See detailPrediction of remaining fatigue life of welded joints in wind turbine support structures considering strain measurement and a joint distribution of oceanographic data
Mai, Anh Quang ULiege; Morato Dominguez, Pablo Gabriel ULiege; Rigo, Philippe ULiege

in Marine Structures (2019), 66

Reassessing the remaining fatigue life of the wind turbine support structures becomes more and more crucial for operation, maintenance, and life extension when they are reaching the end of their design ... [more ▼]

Reassessing the remaining fatigue life of the wind turbine support structures becomes more and more crucial for operation, maintenance, and life extension when they are reaching the end of their design service life. By using measured oceanographic and strain data, each year, remaining fatigue life can be updated to adapt the operation to real loading conditions. Previous works have not put attention to address the complexity of offshore loading combinations and as-constructed state of the structure in estimating structural responses for fatigue behaviour to stochastically predict the remaining fatigue life. The present paper links the oceanographic data to fatigue damage by using measured strain, and uses the Bayesian approach to update the joint distribution of the oceanographic data. Consequently, the failure probability of the support structure can be updated and so the predicted fatigue life. The year-to-year variation of the 10-min mean wind speed, the unrepresentativeness of measured strain, the measurement uncertainty, and corrosion are considered together with uncertainties in Miner′s rule and S–N curves. The present research shows that the real oceanographic data can be used to adjust the predicted remaining fatigue life and eventually give decision support for the wind turbine operation. [less ▲]

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See detailPOMDP based Maintenance Optimization of Offshore Wind Substructures including Monitoring
Morato Dominguez, Pablo Gabriel ULiege; Nielsen, Jannie S.; Mai, Anh Quang ULiege et al

in Proceedings of the 13th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP13) (2019, May 27)

Sequential decision making under uncertainty is a complex task limited normally by computational requirements. A novel methodology is proposed in this paper to identify the optimal maintenance strategy of ... [more ▼]

Sequential decision making under uncertainty is a complex task limited normally by computational requirements. A novel methodology is proposed in this paper to identify the optimal maintenance strategy of a structural component by using a point-based Partially Observable Markov Decision Process (POMDP). The framework integrates a dynamic bayesian network to track the deterioration over time with a POMDP model for the generation of a dynamic policy. The methodology is applied to an example quantifying whether a monitoring scheme is cost effective. This complex decision problem comprised of 200 damage states is solved accurately within 60 seconds of computational time. [less ▲]

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See detailReliability assessment of aging miter gates in the presence of corrosion and fatigue
Dang Van Thuong, ULiege; Mai, Anh Quang ULiege; Morato Dominguez, Pablo Gabriel ULiege et al

Poster (2019, February 18)

Aging Hydraulic steel structures, especially lock gates suffer from structural deterioration with fatigue and corrosion, resulting in a reduction of their resistance. A prolonged exposure to these hazards ... [more ▼]

Aging Hydraulic steel structures, especially lock gates suffer from structural deterioration with fatigue and corrosion, resulting in a reduction of their resistance. A prolonged exposure to these hazards results in a reduction of structural resistance which can lead to failure. This research presents an approach to compute the reliability of aging miter gates in the presence of corrosion and fatigue. First order reliability index method is used to calculate reliability of the structure. An example of an aging miter gate is used for demonstration. [less ▲]

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See detailPOMDP-Based Risk Maintenance Planning for Offshore Wind Substructures
Morato Dominguez, Pablo Gabriel ULiege; Nielsen, Jannie S.; Rigo, Philippe ULiege

Poster (2019, February 18)

This work presents a novel methodology to identify the optimal maintenance strategy for an offshore wind structural component, providing a flexible and reliable support to decision-making and balancing ... [more ▼]

This work presents a novel methodology to identify the optimal maintenance strategy for an offshore wind structural component, providing a flexible and reliable support to decision-making and balancing inspection, repair and failure costs. The methodology is tested for a tubular joint through a 60-states POMDP, obtaining the optimal maintenance policy in low computational time and in good agreement with common Risk-Based Inspection (RBI) methods. [less ▲]

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See detailPoint-based POMDP Risk Based Inspection of Offshore Wind Substructures
Morato Dominguez, Pablo Gabriel ULiege; Nielsen, Jannie Sonderkær; Mai, Anh Quang ULiege et al

in Caspeele, Robby; Taerwe, Luck; Frangopol, Dan M. (Eds.) Life Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision (2019)

This article presents a novel methodology to select the optimal maintenance strategy of an offshore wind structural component, providing a flexible and reliable support to decision-making and balancing ... [more ▼]

This article presents a novel methodology to select the optimal maintenance strategy of an offshore wind structural component, providing a flexible and reliable support to decision-making and balancing inspection, repair and failure costs. The procedure to create a “Point-Based” Partially Observable Markov Decision Process (POMDP) is described and a calibrated fracture mechanics model is introduced to assess the deterioration of the structure. The methodology is then tested for a tubular joint through a 60-states POMDP, obtaining the optimal maintenance policy in low computational time and in good agreement with common Risk-Based Inspection (RBI) methods. [less ▲]

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See detailUsing SCADA in updating failure probability of a monopile support structure
Mai, Anh Quang ULiege; Weijtjens, Wout; Christof, Devriendt et al

in EAWE PhD Seminar 2018 Proceedings (2018, September 18)

Assessment of existing offshore wind turbine support structures is crucial for a condition-based inspection planning and life extension decision. This paper aims at utilizing SCADA as new information to ... [more ▼]

Assessment of existing offshore wind turbine support structures is crucial for a condition-based inspection planning and life extension decision. This paper aims at utilizing SCADA as new information to update failure probability of monopile support structures in fatigue failure mode. The SCADA was collected from a Belgian offshore wind farm. It is assumed that fatigue loading of the monopile support structure comes mainly from wind action. One-year data of measured strain is used together with the concurrently measured 10-minute wind speed to built the limit state function. Fatigue-critical strain history is derived from the data at three measuring locations on the same circumference. The 10-minute mean wind speed is considered as a random variable and used to calculate the fatigue damage. Fatigue damage is calculated using Miner's rule. The year-to-year variation of the 10-minute mean wind speed, the unrepresentativeness of the measured strain, and the measurement uncertainty are considered together with uncertainties in Miner's rule and the S-N curve. The Bayesian approach is used to update the 10-minute mean wind speed distribution considering measurement data. Consequently, the failure probability of the support structure can be updated. The results show that after three years of measurement, there is no significant differences in the calculated failure probability between cases where the updated 10-minute mean wind speed distribution and the design distribution are used. The load factor applied to the measured stress (e.g. stress concentration factor, corrosion effects, or interpolation factor for unmeasured locations) significantly affects the calculated failure probabilities. In conclusion, the wind measurement data can be used to predict failure probability of the monopile support structure given that a limited concurrently measured strain data is available. Further research is needed to combine the SCADA with inspection data (crack, corrosion) for optimising the inspection plan or a life extension purpose. [less ▲]

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See detailUpdating the failure probability of miter gates based on observation of water levels
Dang Van Thuong, ULiege; Mai, Anh Quang ULiege; Morato Dominguez, Pablo Gabriel ULiege et al

in Structural Integrity (2018, September 05)

Hydraulic steel structures, especially lock gates play a significant role in keeping navigation traffic uninterrupted. After a few decades of operation, many of the welded joints may suffer various ... [more ▼]

Hydraulic steel structures, especially lock gates play a significant role in keeping navigation traffic uninterrupted. After a few decades of operation, many of the welded joints may suffer various degrees of deterioration, primarily due to fatigue. To economically combining crack inspection with a scheduled maintenance of the movable parts of the gate, it is valuable to predict inspection time of the welded joints using the historical operations of the gate, i.e. the variation of water levels. Updating failure probability of welded joint is mature in the offshore industry, but it is rarely applied for inland navigation lock gates where the contribution to fatigue failure comes from the variation of water pressures during operation of the lock gates. The scope of this paper is to predict the inspection time of a welded joint using the observed water levels from the operational history. The updating of the failure probability is done for three inspection techniques, considering annual probability and repair decisions. The results show the effects of critical annual probability and the probability of detections (PODs) on the update failure probability for a welded joint. [less ▲]

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See detailRisk Based Maintenance of Offshore Wind Substructures
Morato Dominguez, Pablo Gabriel ULiege; Rigo, Philippe ULiege

Conference (2018, June 29)

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See detailInnovative Framework for Risk-Based Maintenance Optimization of Offshore Wind Substructures
Morato Dominguez, Pablo Gabriel ULiege; Nielsen, Jannie S.; Rigo, Philippe ULiege

Poster (2017, December 04)

Detailed reference viewed: 51 (9 ULiège)