The Experts below are selected from a list of 7602 Experts worldwide ranked by ideXlab platform
Ingrid Bouwer Utne - One of the best experts on this subject based on the ideXlab platform.
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Routing and Scheduling of Maintenance Fleet for Offshore Wind Farms
Wind Engineering, 2015Co-Authors: Lijuan Dai, Magnus Stålhane, Ingrid Bouwer UtneAbstract:Reducing the operation and maintenance (O&M) cost is a necessity in current offshore wind farms so that the produced power can achieve a competitive price in the market. An offshore wind farm normally comprises a large number of turbines which demand frequent maintenance visits. In addition to making maintenance plans that avoid downtime and production losses, it is important to utilize the expensive resources, such as Service Vessels, in an efficient way. This article introduces the routing and scheduling problem of a maintenance fleet for offshore wind farms (RSPMFOWF), which is to determine the optimal assignments of turbines and routes to the Vessels in terms of cost. Simultaneously considering the characteristics and limitations in this problem, we present the mathematical formulations for the RSPMFOWF. A computational case study is also carried out. The results provide both the optimized cost and detailed arrangements, which can be directly used in maintenance planning.
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risk of collision between Service Vessels and offshore wind turbines
Reliability Engineering & System Safety, 2013Co-Authors: Lijuan Dai, Sa Ren Ehlers, Marvin Rausand, Ingrid Bouwer UtneAbstract:Offshore wind farms are growing in size and are situated farther and farther away from shore. The demand for Service visits to transfer personnel and equipment to the wind turbines is increasing, and safe operation of the Vessels is essential. Currently, collisions between Service Vessels and offshore wind turbines are paid little attention to in the offshore wind energy industry. This paper proposes a risk assessment framework for such collisions and investigates the magnitude of the collision risk and important risk-influencing factors. The paper concludes that collisions between turbines and Service Vessels even at low speed may cause structural damage to the turbines. There is a need for improved consideration of this kind of collision risk when designing offshore wind turbines and wind farms.
Lijuan Dai - One of the best experts on this subject based on the ideXlab platform.
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Routing and Scheduling of Maintenance Fleet for Offshore Wind Farms
Wind Engineering, 2015Co-Authors: Lijuan Dai, Magnus Stålhane, Ingrid Bouwer UtneAbstract:Reducing the operation and maintenance (O&M) cost is a necessity in current offshore wind farms so that the produced power can achieve a competitive price in the market. An offshore wind farm normally comprises a large number of turbines which demand frequent maintenance visits. In addition to making maintenance plans that avoid downtime and production losses, it is important to utilize the expensive resources, such as Service Vessels, in an efficient way. This article introduces the routing and scheduling problem of a maintenance fleet for offshore wind farms (RSPMFOWF), which is to determine the optimal assignments of turbines and routes to the Vessels in terms of cost. Simultaneously considering the characteristics and limitations in this problem, we present the mathematical formulations for the RSPMFOWF. A computational case study is also carried out. The results provide both the optimized cost and detailed arrangements, which can be directly used in maintenance planning.
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Modelling Operation of Service Vessels in Offshore Wind Farms Using Stochastic Activity Networks
Ship Technology Research, 2014Co-Authors: Peiqing Zhang, Lijuan Dai, Yiliu LiuAbstract:The complexity and uncertainty involved in current offshore wind energy projects creates a need for decision support models. By applying stochastic activity networks (SANs), this article introduces a new way to model the operation of Service Vessels in an offshore wind farm. The SANs enable not only building a physical composition of the offshore wind farm, but also integration of the maintenance demands from various components, maintenance planning and maintenance processes at the same time. With sufficient input data, the complete model can be used to evaluate the availability of the offshore wind farm and work load on the Service Vessels, subsequently to determine or improve the maintenance plan. Based on their graphical rules, the SAN models are concise and easy to understand. The established SAN models can be applied individually for the evaluation of different maintenance plans, or can also be an add-on in more comprehensive decision support models.
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Safe and efficient operation and maintenance of offshore wind farms
2014Co-Authors: Lijuan DaiAbstract:This PhD work has been carried out when early experience is obtained from the first offshore wind energy projects and new projects with large capacity are in preparation. The importance and challenges of operation and maintenance (OM the most important standard for protection systems. In addition, this PhD work develops a framework based on a life cycle model for integrating reliability, availability, maintainability and safety (RAMS) in the development of offshore wind farms, and an alternative method for modeling the operation of Service Vessels for offshore wind farms by using stochastic activity networks (SANs).The thesis summarises the work performed and results obtained in the end. There are several areas of further research. One major area is to improve the new approaches and frameworks in this PhD project with updated information and industry data, and through the implementation of these approaches and frameworks in industrial applications.
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risk of collision between Service Vessels and offshore wind turbines
Reliability Engineering & System Safety, 2013Co-Authors: Lijuan Dai, Sa Ren Ehlers, Marvin Rausand, Ingrid Bouwer UtneAbstract:Offshore wind farms are growing in size and are situated farther and farther away from shore. The demand for Service visits to transfer personnel and equipment to the wind turbines is increasing, and safe operation of the Vessels is essential. Currently, collisions between Service Vessels and offshore wind turbines are paid little attention to in the offshore wind energy industry. This paper proposes a risk assessment framework for such collisions and investigates the magnitude of the collision risk and important risk-influencing factors. The paper concludes that collisions between turbines and Service Vessels even at low speed may cause structural damage to the turbines. There is a need for improved consideration of this kind of collision risk when designing offshore wind turbines and wind farms.
Rolf Johan Bye - One of the best experts on this subject based on the ideXlab platform.
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Professional culture and risk perception: Coping with danger on board small fishing boats and offshore Service Vessels
Reliability Engineering & System Safety, 2007Co-Authors: Rolf Johan Bye, Gunnar Martin LamvikAbstract:Abstract This paper discusses the relationships between subjective risk perception and individuals’ adaptation to high-risk working conditions. It is based on a study carried out among personnel on offshore Service Vessels in the North Sea and Norwegian fishermen. Risk perception, fatality rates and the discrepancy between subjective risk perception and formal risk levels are compared. The results of these comparisons are discussed by using the concept of culture, and indicate that a correlation between formal risk estimation and subjective perception does not necessarily exist. In fact, subjective risk perception may be seen as a reflection of interactional conventions developed among employees dealing with their working conditions, more than as a reflection of the formal estimated risk level.
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Alienation as an Explanatory Factor for Increased Risk on Service Vessels in the North Sea
Probabilistic Safety Assessment and Management, 2004Co-Authors: Trond Kongsvik, Rolf Johan ByeAbstract:Our main purpose with this study was to explain why personnel on Service Vessels in the North Sea have been more accident prone than other personnel groups in the Norwegian oil industry
George Marsh - One of the best experts on this subject based on the ideXlab platform.
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Carbon transforms wind farm access
Reinforced Plastics, 2015Co-Authors: George MarshAbstract:A new form of marine craft, one minute a veritable greyhound of the seas and the next a steady platform for embarking from, has arisen over the last few years for serving offshore wind farms. Advanced low-weight composites are key enabler for these wind farm Service Vessels (WFSVs).
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WFSV: Hull form focus
Renewable Energy Focus, 2013Co-Authors: George MarshAbstract:George Marsh looks at the latest designs of offshore wind farm Service Vessels coming off the drawing board to meet the tougher demands of the harsher sea conditions where the next generation of offshore projects will be built.
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Opportunities for composites in wind farm Service Vessels
Reinforced Plastics, 2012Co-Authors: George MarshAbstract:The continued development offshore wind farms has created a growing market for support boats to transfer personnel and equipment to the turbines. George Marsh explains why the manufacturers of these Vessels are turning to composite designs to improve fuel efficiency.
Marina Z. Solesvik - One of the best experts on this subject based on the ideXlab platform.
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Innovation on the Open Sea : Examining Competence Transfer and Open Innovation in the Design of Offshore Vessels
Technology Innovation Management Review, 2015Co-Authors: Odd Jarl Borch, Marina Z. SolesvikAbstract:In this article, we discuss the role of open innovation in collaborative design processes in mature industries such as the shipping industry. We examine the design of high-tech offshore Service Vessels in environments characterized by high volatility and complexity. We elaborate on the role that accumulating and sharing core competences plays in speeding up the innovation process and increasing product value. We present a longitudinal case study of a shipping company implementing an open innovation approach that integrates its own core competences in offshore operations with the competences of ship designers and ship builders to develop a new design for challenging environments. In this article, we draw on an open innovation approach and a competence-based view to demonstrate how the firm can "reach out" to gain novel competences related to innovation, which may transform the competitive environment to the firm’s advantage. The article would be useful to innovation scholars and practitioners who work with innovative product development.
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CDVE - Collaborative Design of Advanced Vessel Technology for Offshore Operations in Arctic Waters
Lecture Notes in Computer Science, 2013Co-Authors: Odd Jarl Borch, Marina Z. SolesvikAbstract:The paper presents the requirements and challenges to collaborative design related to the design of Vessels for offshore operations in the Arctic area. We look into the design process of offshore Service Vessels in environments characterized by high volatility and complexity. Due to increased complexity as to functionality, the number of stakeholders and uncertainty as to environmental aspects more information from different sources have to be included, also encompassing long trial periods with user feedback. This has implications for the construction processes and the open interplay with partners in an open innovation approach.
