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- Backalov, Igor, et al.
(författare)
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Ship Stability, Dynamics and Safety : Status and Perspectives
- 2015
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Ingår i: 12TH INTERNATIONAL CONFERENCE ON THE STABILITY OF SHIPS AND OCEAN VEHICLES (STAB2015). - : UNIV STRATHCLYDE, DEPT NAVAL ARCHITECTURE & MARINE ENGINEERING. ; , s. 99-141
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Konferensbidrag (refereegranskat)abstract
- With the aim of analysing the current status and possible future perspectives of research in the field of ship stability, dynamics and safety, this paper deals with an extensive review of the research work presented at the International Conferences on Stability of Ships and Ocean Vehicles (STAB Conferences) and the International Ship Stability Workshops (ISSW) held during the period 2009-2014. The reviewed material is organised in different sections, corresponding to a set of identified main typical focal macro-topics of research. On the basis of the reviewed material, consolidated research topics are highlighted together with emerging topics, and ideas for possible future research and its needs and focus are provided. Discussion is also provided regarding the link between research and educational aspects.
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- Backalov, Igor, et al.
(författare)
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Ship Stability & Safety in Intact Condition through Operational Measures
- 2015
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Ingår i: 12TH INTERNATIONAL CONFERENCE ON THE STABILITY OF SHIPS AND OCEAN VEHICLES (STAB2015). - : UNIV STRATHCLYDE, DEPT NAVAL ARCHITECTURE & MARINE ENGINEERING. ; , s. 159-172
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Konferensbidrag (refereegranskat)abstract
- Guaranteeing a sufficient level of safety from the point of view of stability is typically considered to be a matter of design. However, it is impossible to ensure safety only by design measures, and operational measures can then represent a complementary tool for efficiently and cost-effectively increasing the overall safety of the vessel. Time could therefore be coming for systematically considering operational measures as a recognised and normed integral part of a holistic approach to ship safety from the point of view of stability. In this respect, the scope of this paper is to identify open challenges and to provide, in general, food for thoughts for stimulating a discussion on the topic of operational measures, with specific attention to the intact ship condition. The aim of the discussion should be to provide ground for further proceeding towards the goal of implementing a virtuous integrated approach to ship stability safety which gives due credit to effective and robust operational risk control options.
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- Battley, Mark A., et al.
(författare)
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Effects of Panel Stiffness on Slamming Responses of Composite Hull Panels
- 2009
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Ingår i: 17th International Conference on Composite Materials, ICCM17. ; , s. 1-11
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Konferensbidrag (refereegranskat)abstract
- Controlled water slam testing of composite hull panels was conducted to study the effect of hydroelasticity for three panels with different stiffnesses. The experimental methodology successfully characterised the hydroelastic behaviour, which included kinematic as well as inertial effects. Hydroelastic effects included changes in panel geometry, local velocity, fluid pressures, and panel structural responses.
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- Bergendahl, Per-Anders, 1947, et al.
(författare)
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Insurance or risk in energy investments - the case of Sweden
- 1986
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Ingår i: Swedish and Soviet Energy Problems: Proceedings from a Conference in Moscow: (ed Kurt Wickman), June 26-28, 1986. - 0283-4928. - 9154092744 ; SB: 7
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Konferensbidrag (refereegranskat)abstract
- In this report we put the whole enery system into our perspective and derive strategies with regard to five different energy price scenarios. A fundamental investment strategy is that which is consistent with the minimum expected cost (called Strategy A). Using strategy A as a point of reference, it is illustrated how, to which extent and at what costs insurance undertaking can form an energy system less vulnerable (risk-exposed) to the development of energy prices. A specific formation of the system at lower levels (i.e. within communities, companies and households) which - in the aggregate - corresponds to any of the investment strategies B-F, will imply a less volnerable, or risk-exposed energy system. The administration may lay down the guiding principles for such a formation through an appropriate balancing of various policy measure (taxation, legislation, subsidies, to investments and R&D etc.) and through its information and forecasting activities.
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- Bergendahl, Per-Anders, 1947, et al.
(författare)
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The Future Energy System - A Problem of Planning under Uncertainty
- 1985
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Ingår i: In: Kydes AS, Gereghty DM, editors. Energy markets in the longer-term: planning under uncertainty—proceedings of the IMACS second international symposium. Amsterdam: North-Holland; 1985. p. 253–60..
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Konferensbidrag (refereegranskat)abstract
- Assumptions about future conditions (e.g. fuel prices) are more or less uncertain. Since energy investment projects most often are characterised by high costs and a planned long term utilisation, missallocation of resources may be very expensive. Using the MARKAL model, a number of stylized examples are provided in order to illustrate the economic consequences of misjudgment. Furthermore, possible guidelines for decision-making under uncertainty are illustrated. Finally the boundaries of this analytical approach are highlighted.
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- Burman, Magnus, et al.
(författare)
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Spectrum Slam Fatigue Loading of Sandwich Materials for Marine Structures
- 2010
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Sandwich materials are more frequently used in high speed craft and ferries. The motivation is reduced weight and associated operational cost. The hull structure in these vessels is subjected to repeated (fatigue) slamming loads (high strain rate loading). Scantling societies treat sandwich materials differently in their design rules. In common reduction or safety factors on the static strength of sandwich materials are used calculating the design stress. In most rules there is no explicit consideration of fatigue performance nor of the altered material properties related to high strain rate loading. In this work actual response measurements on a high speed vessel are used to formulate a tentative slam fatigue loading spectrum for sandwich core materials. This spectrum is then used in the testing of one type of core material common in hulls panels, Divinycell H200. The slam spectrum fatigue results are then compared to fatigue test results based on constant amplitude loading based on a method of equivalent stress. Earlier studies indicate that slamming fatigue do not affect the life compared to constant amplitude loading. However there are also studies that indicate that both a static overload (post the yield point) prior to fatigue loading, and block sequence fatigue loadings with initial high amplitudes followed by low amplitude have a detrimental effect of the fatigue life. In the current study both various amplitudes and high strain rates are included in the fatigue loading sequence. The spectrum fatigue results match the fatigue life from the constant amplitude loading. However, the number of samples is limited and the different effects of fatigue at high strain rates and fatigue block sequence are not fully clarified. It is possible that those effects may counteract each other in the current work. Further studies on sandwich foam core material properties and improvement of methods for material characterization is concluded to be of interest and will follow.
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