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- Daun, Viktor, et al.
(författare)
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Demonstrating the use of urban and inland waterways – for densely populated cities and more sustainable transport
- 2017
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Ingår i: SSPA Highlights. ; 64, s. 8-11
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Demonstrating new logistics solutions is shown to be an important step for gaining understanding of system prerequisites for commercialisation, both with regard to technical issues such as vessel design characteristics and cargo handling equipment, and social matters such as the importance of practitioner involvement and the evaluation of performance criteria. SSPA demonstrated the use of urban and inland waterways as part of two large collaboration projects: DenCity and NÖKS II. This is a promising path for the future, both for managing the trend towards more densely populated cities and for using more sustainable transport solutions.
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| 2. |
- Ringsberg, Jonas, 1971, et al.
(författare)
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Analysis of impact loads on a self-elevating unit during jacking operation
- 2017
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Ingår i: Journal of Offshore Mechanics and Arctic Engineering. - : ASME International. - 0892-7219 .- 1528-896X. ; 139:3, s. 1-9
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Tidskriftsartikel (refereegranskat)abstract
- A method is presented that enables the analysis of weather window assessments for the installation and retrieval phases of a self-elevating unit (SEU). The method takes site-specific parameters, defined as soil type and water depth, into account in addition to vessel-specific and environmental parameters. The inclusion of site-specific parameters is the novel contribution compared to assessment methodologies used today. A simulation model is presented that incorporates a coupled non-linear time-domain analysis of vessel motion and soil-structure interaction. Soil deformation behaviour during impact is described by resistance curves based on a bearing capacity theory. A structural evaluation criterion against which impact forces are compared is used for weather window assessments. The simulation model is applied on a case study utilizing different soil types to study impact forces and the capacity of the structure for withstanding such impacts and eventually performing a weather window assessment. The results show that the jacking operation can be divided into two phases when it comes to loads on the spudcan: a phase dominated by vertical forces followed by a phase dominated by horizontal forces. It is found that including soil deformation behaviour is of paramount importance to the magnitude of the resulting impact forces and that class-recommended practice does indeed produce rather large force estimates. Thus, assessments where site-specific parameters are incorporated could definitely increase the operable weather window for SEUs, and, consequently, increase the economic competitiveness of, for example, the offshore wind industry.
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| 3. |
- Ringsberg, Jonas, 1971, et al.
(författare)
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Analysis of impact loads on a self-elevating unit during jacking operation
- 2015
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Ingår i: Proceedings of The ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2015). - 9780791856499 ; 3, s. 1-13
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Konferensbidrag (refereegranskat)abstract
- The renewable energy resource of offshore wind is believed to have a great potential in playing an essential role on the future energy market in Europe, but there are complications such as harsh weather and low accessibility. To manage this, most offshore wind turbines of today are installed and maintained using self-elevating units (SEUs). In this study, a method is presented that enables the analysis of weather window assessments for the installation and retrieval phases of a SEU. The method of analysis takes site-specific parameters, defined as soil type and water depth, into account in addition to vessel-specific and environmental parameters. The inclusion of site-specific parameters is the novel contribution compared to assessment methodologies used today.A simulation model is presented that incorporates a coupled non-linear time-domain analysis of vessel motion and soil-structure interaction. Soil deformation behaviour during impact is described by resistance curves based on a bearing capacity theory. A structural evaluation criterion against which impact forces are compared is used for weather window assessments. The simulation model is applied on a case study utilizing different soil types to study impact forces and the capacity of the structure for withstanding such impacts and eventually performing a weather window assessment. The results show that the jacking operation can be divided into two phases when it comes to loads on the spudcan: a phase dominated by vertical forces followed by a phase dominated by horizontal forces. It is found that including soil deformation behaviour is of paramount importance to the magnitude of the resulting impact forces and that class-recommended practice does indeed produce rather large force estimates. Thus, assessments where site-specific parameters are incorporated could definitely increase the operable weather window for SEUs, and, consequently, increase the economic competitiveness of, for example, the offshore wind industry.
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| 8. |
- Svanberg, Martin, 1982, et al.
(författare)
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Logistics demonstrations as a participatory research design
- 2017
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Ingår i: Conference Proceedings Logistics Reserach Network 2017.
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Konferensbidrag (refereegranskat)abstract
- Purpose: Relevance and impact -- i.e. advancing practice -- of research has become increasingly important recently. This is shown, first, by the trend among research funding agencies to favour research projects with high technology readiness level, entailing a strong focus on demonstration of certain artifacts. Second, the logistics discipline advocates increased use of participatory research designs. Third, there is an increased focus on “supply chain” as level of analysis; extending the system boundaries for analysis to address complex problems, and include the view of actors to a larger extent in their investigations. In order to advancing practice in research, scholars within the logistics and SCM discipline can make use of demonstrations as research method, although demonstrations is not well developed as a research design. The purpose of this paper is therefore to explain how demonstrations can be used as research design, in this paper illustrated by demonstrations within the domain of logistics/SCM.Research Approach: A framework for using demonstration as research design was developed based on (1) related literature on action research and (2) learning from two demonstrations of new waterway logistics solutions. Data have been collected at all stages of the demonstrations; notes from planning meetings, smaller investigations shaping the design of the demonstrations, interviews with involved actors, observations and video recording during demonstrations, as well as notes from captains’ logbooks. In order to underpin the framework, the demonstrations have been analysed with respect to both the process of designing, performing and evaluating the demonstrations as well as the understanding generated from the demonstrations regarding how to make use of more waterway shipping in the studied contexts.Findings and Originality: The outcome of the paper is a framework that describes a recipe for undertaking demonstration research, conceptualized into three main stages; (1) the design phase; (2) data collection and analysis; (3) the path from demonstration towards scaling up the demonstration to a commercialized new system. The framework hence adds to existing action research literature by describing how to use demonstrations as a participatory research design.Research Impact: The framework developed in this paper is based on demonstrations of new waterway concepts, and could serve as starting point for demonstrations as research design within other contexts as well; having either a system innovation or technical development as point of departure. Practical Impact: A strength of the demonstration as participatory research design lies in its intermediate nature; overlapping with both the current system as well as a new system. A demonstration is something tangible for involved actors to reflect upon, creating relevant actor networks, joint experiences, and allowing for learning among all involved actors of important parameters in the design of, as well as the path towards a new system in the future.
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