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BSRA Technical Memorandum No. 128 Reports on foreign observers' course on the nuclear ship 'Savannah'. Health Physics
AuthorsJ A Dodd ; S Macdonald
Shelf Locationin storage
AuthorsPublisherJ A Dodd ; S Macdonald
British Ship Research Association
Shelf LocationDate publishedin storage
1960
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BSRA Technical Memorandum No. 129 Reports on foreign observers' course on the nuclear ship 'Savannah'. Ship Design
AuthorsJ A Dodd ; S Macdonald
Shelf Locationin storage
AuthorsPublisherJ A Dodd ; S Macdonald
British Ship Research Association
Shelf LocationDate publishedin storage
1960
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Report No. R.2: Report on Hogging and Sagging Tests on Riveted Tanker M.V. "Newcombia"
AuthorsThe Admiralty Ship Welding Committee
PublisherHis Majesty's Stationery Office
AuthorsDate publishedThe Admiralty Ship Welding Committee
1948
PublisherHis Majesty's Stationery Office
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Current forces on a large pier near an existing pier
AuthorsSubrata K Chakrabarti ; Mark McBride
Date published2004
AbstractA new suspension bridge is being built over the Tacoma Narrows Washington. The bridge will be placed on a structure mounted on 2 large concrete caissons which will be exposed to strong currents. The caissons are being built at site while floating and moored in high currents. In order to determine the forces on the caisson due to current a series of scaled physical model tests of one of the caissons was carried out. The forces on the new caisson were measured in the presence of the existing bridge pier and the bottom contours of the Narrows were accurately modeled. The model scale was chosen as 1:100 and the tests were performed for the caisson at different drafts. This paper describes the test setup and measurement system for a series of fixed caisson tests and demonstrates the consistency of the test data. The measured inline drag and transverse lift forces on the fixed caisson at different drafts are presented and the effect of the fluid velocity and flow vorticity on the frequency contents in the forces is discussed. The interaction effect of the neighbouring existing pier on the current forces of the new caisson is investigated. Since the measured forces were applied in the design analysis of the caissons the scaling effect of the model test is also discussed.
AuthorsSubrata K Chakrabarti ; Mark McBride
Date published2004
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Hydrodynamic wave loading on offshore structures simulated by a two-phase flow model
AuthorsRik Wemmenhove ; Erwin Loots ; Arthur E P Veldman
Date published2005
AbstractDuring violent weather conditions offshore structures are subject to different types of wave impact. The impacting waves are complex mixtures of water and air the properties of the mixture having a serious effect on velocity fields around and pressure levels on offshore structures. The numerical simulation of hydrodynamic wave loading on different types of offshore structures is important to predict forces on and water motion around these structures. A numerical study of two-phase flow over a sloping bottom with the presence of breaking waves is presented. The details of the numerical model an iVOF (improved volume of fluid) method are presented. The program has been developed initially to study the sloshing of liquid fuel in satellites. This micro-gravity environment requires a very accurate and robust description of the free surface. Later the numerical model has been used for calculations of green water loading and the analysis of anti-roll and sloshing tanks including the coupling with ship motions. The model has been extended recently to take two-phase flow effects into account. Two-phase flow effects are particularly important near the free surface where loads on offshore structures strongly depend on the interaction between different phases like air and water. Entrapment of air pockets and entrainment of bubble clouds have a cushioning effect on breaking wave impacts. The velocity field around the interface of air and water being continuous across the free surface requires special attention. By using a newly developed gravity-consistent discretisation spurious velocities at theX40537 Hydrodynamic strength and fatigue foil design
AuthorsRik Wemmenhove ; Erwin Loots ; Arthur E P Veldman
Date published2005
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On the interaction of pipe lines on the seabed
AuthorsK G Rados
Date published2000
AbstractIn many cases particularly in the development and operation of subsea satellite oil wells more than one pipe is required to be laid along the same path on the seabed. In this case there exists no general technique to evaluate how the stability of each pipe is affected by both the surrounding pipes and the seabed. In this paper two methods are described which have been developed to account for the effects of the seabed and the interaction between the pipes. The first is the 'boundary layer-wake' interaction technique in which the wake due to a uniform inflow velocity field is embedded in a 1/7th power law boundary layer profile. The second is the 'real-imaginary' pipe wake interaction technique in which the effects of the seabed are considered by means of the wake of a mirrored imaginary pipe. For multiple wake interaction modelling a quadratic formula based on energy considerations is used. Preliminary results of these techniques are presented for two patterns of pipe bundles: one in a pyramid shape and the other consisting of pipes lying parallel to each other (flat pack). It is shown that the forces on the pipe all increase with pipe diameter spacing and velocity. It is also noted that the forces on 'flat pack' pipe configurations are less than those developed by a pyramid configuration.
AuthorsK G Rados
Date published2000
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Heat transfer on a small Stirling Engine - heat transfer on expansion chamber wall
AuthorsF Toda
Date published1991
AbstractAn experimental Stirling Engine was fitted with heat flux sensors on the expansion chamber and used to study heat transfer between cylinder wall and working gas - heat transfer coefficients are calculated for heating and cooling strokes and the results compared with theoretical predictions.
AuthorsF Toda
Date published1991
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Dynamic stability and effect of water on deck on small fishing vessels
AuthorsAlberto Francescutto ; Antonio Cardo ; Guilio Russo Krauss
Date published2001
AbstractStarting from the analysis of casualties at sea involving small fishing vessels the results are presented of an experimental study on the capsizing resistance in beam or following steep or high waves. Attention is given to the physical mechanisms leading to capsizing. The experimental results are compared with existing theoretical approaches. The results stress the importance of deck wetness and of the presence of fishing nets as wave trappers on the probability of capsizing.
AuthorsAlberto Francescutto ; Antonio Cardo ; Guilio Russo Krauss
Date published2001
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On a prediction method of hydrodynamic forces acting on ship hull including the effect of hull form
AuthorsK Kijima ; Y Furukawa ; K Yukawa et al.
Shelf Location213c
AbstractAn attempt is made to predict the hydrodynamic forces acting on ship hull theoretically based on slender body theory. From numerical calculations the present prediction method is found to give good agreement between predicted hydrodynamic forces and experimental results considering the parameter s that expresses distance between separation point and initial position of free vortices shed from the separation point. The formulation and the numerical calculations are discussed.
AuthorsDate publishedK Kijima ; Y Furukawa ; K Yukawa et al.
1996
Shelf Location213c
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The system-wide impact of technologies for on-line testing of emergency isolation valves
AuthorsD Essam ; K Robinson
Date published2000
AbstractOn-line testing of emergency isolation valves is an emerging technology but it is important to understand the impact such testing can have on safety systems as a whole. Using a variety of risk analysis techniques the varying effects of different on-line testing strategies are demonstrated. Based on the experience of Drallim Industries and liaison with standards bodies various pitfalls are highlighted and strategies for avoiding them are presented.
AuthorsD Essam ; K Robinson
Date published2000
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CPD Seminar on Microbes in Ships - effects on operations and safety London 12 March 1996
PublisherIMarE Conferences and Symposia
Date published1996
PublisherIMarE Conferences and Symposia
Date published1996
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Impacts on the National Tsunami Hazard Mitigation Program on Operations of the Richard H. Hagemeyer Pacific Tsunami Warning Center
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Report on the investigation of the collision between Diamant/Northern Merchant 3 miles SE of Dover on 6 January 2002
AuthorsMarine Accident Investigation Branch
Shelf Location40d
AuthorsCatalogue numberMarine Accident Investigation Branch
UNK
Shelf Location40d
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Report on the investigation of the fire on board HSS Stena Explorer entering Holyhead 20 September 2001
AuthorsMarine Accident Investigation Branch
Shelf Location40d
AuthorsCatalogue numberMarine Accident Investigation Branch
UNK
Shelf Location40d
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A study on structural design of huge barge structures based on collapsing behaviour and reliability analysis
AuthorsShinji Katsura ; Hiroo Okada ; Koji Masaoka et al.
Date published2003
AbstractThis paper deals with the limit state and reliability analysis of huge barge structures (HBS) which are supposed floating refuse storage and incineration plant based on collapsing behaviour analysis in irregular waves as a part of studies on structural reliability-based design methods. First a limit state and reliability analysis method is shortly presented for the buckling and ultimate collapse strength of deck bulkhead and bottom panels of HBS. Next a simplified method is briefly introduced for collapsing behaviour and reliability analysis of HBS under extreme sea loads by using a developed system combined with a finite element method and plastic node method using hexahedral element models. Moreover a simplified estimation method is shortly introduced for the probabilistic load model considering the hydro-elastic response of the structure in irregular waves. Finally the applicability of the methods is investigated through numerical examples for a 1000m-class HBS under a trial design for some irregular sea-state conditions. Characteristics of the short-term responses and reliability levels are numerically shown.
AuthorsShinji Katsura ; Hiroo Okada ; Koji Masaoka et al.
Date published2003
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About the welding effects on thin stiffened panel assemblies in shipbuilding
AuthorsT T Chau ; F Jancart ; G Bechepay
Date published2001
AbstractThe welding effects on thin stiffened panel assemblies in shipbuilding are examined. The distortion problem is considered. Two thermo-mechanical simulations are carried out on two 3D models of thin stiffened plate panels of a deck and of a bulkhead using a conventional FEM code and the IRCN numerical method. Results show the buckling state reached by the entire bulkhead panel under the effects of V-butt weldings executed on board during the assembly operations. Other applications of the method on thin stiffened plate panels are presented showing the influence of the welding sequence on the residual stresses and initial deflections of such thin plates usually used in shipbuilding.
AuthorsT T Chau ; F Jancart ; G Bechepay
Date published2001
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Effect of corrosion model uncertainty on inspection and repair planning for ship structures
AuthorsLi Dianqing ; Zhang Shengkun ; Tang Wenyong
Date published2004
AbstractA theoretical framework of risk based optimal inspection and repair planning is proposed for the ship structures subjected to corrosion deterioration. The planning problem is formulated as an optimization problem where the expected lifetime costs are minimized with a constraint on the minimum acceptable reliability index. The safety margins are established for the inspection the repair and the failure events for ship structures. moreover the formulae are derived to calculate the failure probability and the repair probability. Based on them two corrosion models namely Paik's model and Guedes Soares' model are adopted to analyze the effect of model uncertainty on the optimal inspection and repair planning for ship structures. The results show that a balance can be achieved betwen the risk cost and total expected inspection and repair costs by using the risk based optimal inspection and repair method which is very effective in selecting the optimal inspection and repair strategy. In addition the uncertainty of corrosion model has a significant influence on the optimal number and the time of inspections and repairs. However it has insignificant influence on the total expected costs and total probability of failure
AuthorsLi Dianqing ; Zhang Shengkun ; Tang Wenyong
Date published2004
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Effects of combination motions on hydrodynamic forces induced on bodies in the sea
AuthorsJ M R Graham ; Y D Zhao ; C Y Zhou et al.
Date published1994
AbstractTwo types of flow around long bodies with a range of cross-sections are examined. The first considers oscillatory flows with two components at right angles to one another with a range of frequency and amplitude ratios. Experimental measurements have been carried out on two pontoon sections undergoing forced motion in two directions in a wave tank. The second is a planar oscillatory flow around a circular cross-section with cycles of varying period and amplitude. This is to examine history effects which occur for fixed cylinders in random waves or risers moving through in-line waves. Both flow types are studied using numerical simulation of the Navier-Stokes equations. Generally very similar effects on the force coefficients result from the computations and the experiments.
AuthorsJ M R Graham ; Y D Zhao ; C Y Zhou et al.
Date published1994
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Experimental and numerical studies on MV Derbyshire
AuthorsDracos Vassalos ; Luis Guarin ; Andrzej Jasionowski
Shelf Location213c
AbstractA systematic experimental and numerical investigation is presented which was carried out to provide evidence to be used in judgement of a number of hypothesis put forward by various parties on the loss of MV Derbyshire. This work was conducted in parallel to an experimental research programme on the safety of bulk carriers in extreme seas. Many of the issues dealt with during the investigation were relatively unknown. Sea keeping model tests were undertaken in extreme sea states in which green seas impact loads on the hatch covers and coamings were characterised. Analytical and numerical studies integrating the results of sea keeping and structural analysis were focused on the assessment of various sinking scenarios. Virtual reality technology was used to present and illustrate the findings. The objectives assumptions and methods adopted during the investigation are summarised and the finding s are presented with emphasis on those issues identified as relevant for drawing recommendations for bulk carriers design and for systematising forensic investigations in maritime accidents.
AuthorsDate publishedDracos Vassalos ; Luis Guarin ; Andrzej Jasionowski
2002
Shelf Location213c
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From sea to space a perspective on the effect of subsea remote intervention techniques on space station design
AuthorsG Hughes ; M Gittleman
Date published1997
AbstractThe decision by Oceaneering International to try to apply the lessons learned through thirty years of successful subsea operations to space particularly to the space station program has led to the creation of Oceaneering Space Systems (OSS). The increasing reliance on a teleoperated worksystem (ROVs and remote tooling) mirrors the assembly and maintenance operations planned for the International Space Station (ISS) program. The equipment and operational philosophy behind remote intervention in both subsea and space are compared. The impact of technology transfer on both industries is looked into.
AuthorsG Hughes ; M Gittleman
Date published1997