The Experts below are selected from a list of 171 Experts worldwide ranked by ideXlab platform
Mats Leijon - One of the best experts on this subject based on the ideXlab platform.
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Measurement System for Evaluating Wanted and Unwanted Forces on a Point Absorbing Wave Energy Converter during Offshore Operation
2015Co-Authors: Liselotte Ulvgård, Ling Hai, Mats LeijonAbstract:A force measurement system has been developed and installed in awave energy converter at Uppsala University. The force in theconnection line as well as the vertical and horizontal strain in thegenerator hull is measured. With these measurements the forces actingon the generator during Offshore Operation can be monitored andanalyzed. This paper presented the principle, implementation and testresults of the measurement system. A brief discussion of error sourcesand possible improvements is also given.
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wave energy converter with enhanced amplitude response at frequencies coinciding with swedish west coast sea states by use of a supplementary submerged body
Journal of Applied Physics, 2009Co-Authors: Jens Engstrom, Jan Isberg, Mikael Eriksson, Mats LeijonAbstract:The full-scale direct-driven wave energy converter developed at Uppsala University has been in Offshore Operation at the Swedish west coast since 2006. Earlier simulations have now been validated by full-scale experiment with good agreement. Based on that, a theoretical model for a passive system having optimum amplitude response at frequencies coinciding with Swedish west coast conditions has been developed. The amplitude response is increased by adding supplementary inertia by use of the additional mass from a submerged body. A sphere with neutral buoyancy is chosen as the submerged body and modeled as being below the motion of the waves. The model is based on potential linear wave theory and the power capture ratio is studied for real ocean wave data collected at the research test site. It is found that the power capture ratio for the two body system can be increased from 30% to 60% compared to a single body system. Increased velocity in the system also decreases the value for optimal load damping from...
Christoph Läsche - One of the best experts on this subject based on the ideXlab platform.
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Model-Based Risk Assessment of Offshore Operations
Volume 1B: Offshore Technology, 2014Co-Authors: Christoph Läsche, Jan Pinkowski, Sebastian Gerwinn, Rainer Droste, Axel HahnAbstract:Safety and dependability are major design objectives for Offshore Operations such as the construction of wind farms or oil and gas exploration. Today processes and related risks are typically described informally and process specification are neither reusable nor suitable for risk assessment. Here, we propose to use a specification language for processes. We integrate this specification language in a generic modeling approach in combination with an analysis tool and a tool to construct health, safety and environment (HSE) plans — a mandatory document for granting a construction/Operation permit. Specifically, for each planned scenario a process is modeled, describing the detailed Operation of the involved actors as well as the interaction with resources and environmental conditions. We enrich this process model with hazardous events which is facilitated by integration with an Offshore Operation generic hazard list, thereby giving access to expert knowledge for the specific situation to be planned. This in turn allows us to perform an automatic quantitative risk assessment using fault tree analysis. We exemplify our approach on a standard Offshore Operation of personnel transfer from an Offshore building to another naval unit by modeling, annotating with hazards, performing the fault-tree analysis, and finally generating HSE plans.Copyright © 2014 by ASME
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SAFECOMP - A method for guided hazard identification and risk mitigation for Offshore Operations
Lecture Notes in Computer Science, 2012Co-Authors: Christoph Läsche, Eckard Böde, Thomas PeikenkampAbstract:One of the effects of the radically changing energy market is that more and more Offshore wind turbines are being constructed. To meet the increasing demand for renewable energy, many new companies with different levels of experience are entering the market. As the construction and maintenance of large Offshore wind farms is a complex task, safety aspects of these Operations are of crucial importance to avoid accidents. To this end, we introduce a method that assists in (1) identifying and precisely describing hazards of a scenario of an Offshore Operation, (2) quantifying their safety impact, and (3) developing risk mitigation means. Based on a guided hazard identification process, a formalization of hazardous scenarios will be proposed that unambiguously describes the risks of a given Offshore Operation. We will demonstrate the feasibility of our approach on a specific Offshore scenario.
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FMICS - Model-Based Risk Assessment Supporting Development of HSE Plans for Safe Offshore Operations
Formal Methods for Industrial Critical Systems, 2012Co-Authors: Rainer Droste, Christoph Läsche, Eckard Böde, Cilli Sobiech, Axel HahnAbstract:The commercial installation of Offshore wind farms is still far from having established standards or procedures and puts high demands on employees who deal with uncertainty and risks. We present a model-based risk assessment approach to support the development of health, safety, and environment (HSE) plans for safe Offshore Operations. For this purpose, a process model is used to integrate all aspects of these complex and safety-critical Operations which involve many different actors, resources, and environmental conditions. On the basis of this model, we are able to identify and precisely describe hazards, quantify their safety impact, and develop risk mitigation means. To this end, we developed methods and tools to support this process, resulting in a formalization of hazardous events that can be used to unambiguously describe the risks of a given Offshore Operation model. We will demonstrate the feasibility of our approach on a specific Offshore scenario.
Thomas Peikenkamp - One of the best experts on this subject based on the ideXlab platform.
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SAFECOMP - A method for guided hazard identification and risk mitigation for Offshore Operations
Lecture Notes in Computer Science, 2012Co-Authors: Christoph Läsche, Eckard Böde, Thomas PeikenkampAbstract:One of the effects of the radically changing energy market is that more and more Offshore wind turbines are being constructed. To meet the increasing demand for renewable energy, many new companies with different levels of experience are entering the market. As the construction and maintenance of large Offshore wind farms is a complex task, safety aspects of these Operations are of crucial importance to avoid accidents. To this end, we introduce a method that assists in (1) identifying and precisely describing hazards of a scenario of an Offshore Operation, (2) quantifying their safety impact, and (3) developing risk mitigation means. Based on a guided hazard identification process, a formalization of hazardous scenarios will be proposed that unambiguously describes the risks of a given Offshore Operation. We will demonstrate the feasibility of our approach on a specific Offshore scenario.
Jens Engstrom - One of the best experts on this subject based on the ideXlab platform.
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wave energy converter with enhanced amplitude response at frequencies coinciding with swedish west coast sea states by use of a supplementary submerged body
Journal of Applied Physics, 2009Co-Authors: Jens Engstrom, Jan Isberg, Mikael Eriksson, Mats LeijonAbstract:The full-scale direct-driven wave energy converter developed at Uppsala University has been in Offshore Operation at the Swedish west coast since 2006. Earlier simulations have now been validated by full-scale experiment with good agreement. Based on that, a theoretical model for a passive system having optimum amplitude response at frequencies coinciding with Swedish west coast conditions has been developed. The amplitude response is increased by adding supplementary inertia by use of the additional mass from a submerged body. A sphere with neutral buoyancy is chosen as the submerged body and modeled as being below the motion of the waves. The model is based on potential linear wave theory and the power capture ratio is studied for real ocean wave data collected at the research test site. It is found that the power capture ratio for the two body system can be increased from 30% to 60% compared to a single body system. Increased velocity in the system also decreases the value for optimal load damping from...
Eckard Böde - One of the best experts on this subject based on the ideXlab platform.
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SAFECOMP - A method for guided hazard identification and risk mitigation for Offshore Operations
Lecture Notes in Computer Science, 2012Co-Authors: Christoph Läsche, Eckard Böde, Thomas PeikenkampAbstract:One of the effects of the radically changing energy market is that more and more Offshore wind turbines are being constructed. To meet the increasing demand for renewable energy, many new companies with different levels of experience are entering the market. As the construction and maintenance of large Offshore wind farms is a complex task, safety aspects of these Operations are of crucial importance to avoid accidents. To this end, we introduce a method that assists in (1) identifying and precisely describing hazards of a scenario of an Offshore Operation, (2) quantifying their safety impact, and (3) developing risk mitigation means. Based on a guided hazard identification process, a formalization of hazardous scenarios will be proposed that unambiguously describes the risks of a given Offshore Operation. We will demonstrate the feasibility of our approach on a specific Offshore scenario.
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FMICS - Model-Based Risk Assessment Supporting Development of HSE Plans for Safe Offshore Operations
Formal Methods for Industrial Critical Systems, 2012Co-Authors: Rainer Droste, Christoph Läsche, Eckard Böde, Cilli Sobiech, Axel HahnAbstract:The commercial installation of Offshore wind farms is still far from having established standards or procedures and puts high demands on employees who deal with uncertainty and risks. We present a model-based risk assessment approach to support the development of health, safety, and environment (HSE) plans for safe Offshore Operations. For this purpose, a process model is used to integrate all aspects of these complex and safety-critical Operations which involve many different actors, resources, and environmental conditions. On the basis of this model, we are able to identify and precisely describe hazards, quantify their safety impact, and develop risk mitigation means. To this end, we developed methods and tools to support this process, resulting in a formalization of hazardous events that can be used to unambiguously describe the risks of a given Offshore Operation model. We will demonstrate the feasibility of our approach on a specific Offshore scenario.
