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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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An investigation to erosion and corrosion on steam-feed water-condensation water pipe for marine boiler plant to cope with a disaster caused on a nuclear power plant
AuthorsHiromi Shiihara ; Hisao Matsushita ; Yuzhong Song et al.
Date published2005
AbstractSevere damage was caused to a Japanese nuclear power plant in August 2004. This was caused by failure on a condensation water pipe in a secondary line. A similar type of failure could occur on a steam-feed water-condensation water pipe for a main or auxiliary boiler plant in ships. Subsequently the occurrence mechanism and circumstances of such a failure on the piping system of ships was investigated. The results confirmed that the same fault could occur in such ships. This failure called FAC (flow accelerated corrosion) is caused by erosion-corrosion at a place where the flow is turbulent such as a behind an orifice or control valve or at a bending such as an elbow which is strongly influenced by temperature flow velocity and the pH of the fluid. Wall pipe thickness is measured in such locations and under such conditions using an ultra-sonic testing machine.
AuthorsHiromi Shiihara ; Hisao Matsushita ; Yuzhong Song et al.
Date published2005
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A systematic study on the effect of main design parameters and internal layout on damage stability characteristics of ro-ro vessels
AuthorsC G Politis ; F del Castilio
Date published2003
AbstractA large number of design parameters are known to affect damage stability of ro-ro passenger ships. Amongst these and of great importance are the number and location of transverse bulkheads the location of longitudinal bulkheads below the main deck the length of lower hold the location of main deck and double bottom the existence of central or side casings above main deck etc. The aim here is to estimate the influence of these parameters on the attained subdivision index A of the vessel. To accomplish this a representative group of ro-ro and ro-pax vessels is selected and starting from the original designs the parameters mentioned above are systematically varied and damage stability calculations are carried out for the new models. The results obtained on the attained subdivision index A are presented and critically reviewed and suggestions for improved design are derived.
AuthorsC G Politis ; F del Castilio
Date published2003
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Effect of shielding gas composition on the properties of hyperbaric GMA welds in Duplex steels
AuthorsN Ware ; J F dos Santos ; I Richardson
Date published1994
AbstractAn attempt is made to carry out a preliminary examination on the effects of selected shielding gas compositions on the weld metal chemical composition and microstructural balance of welds in duplex stainless steel for working depths down to 300msw. Bead-on-plate welds are conducted on duplex stainless steels with a variety of shielding gas mixtures at pressures of 11bar 21bar and 31bar. Weld metal absorption of active gases and the subsequent effect on resultant chemical composition and phase balance are assessed. The experimental procedure materials and equipment are looked at. The results are discussed.
AuthorsN Ware ; J F dos Santos ; I Richardson
Date published1994
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Effects of geometric imperfections on the strength of composite panels in ship hulls
AuthorsK Misirlis ; J Downes ; R S Dow
Date published2009
AbstractA numerical investigation on the effects from initial imperfection shapes on the strength of long fibre-reinforced composite panels is presented in this paper. Fourteen alternative initial geometric imperfections are imposed in long plates for two alternative lay-up configurations; a tri-axial and a balanced woven roving configuration. The sectional response is investigated with nonlinear finite element analysis which incorporates a progressive failure model for the degradation of the material properties. For the analysis both thick and thin panels are considered with breadth to thickness ratios of 10 and 50 respectively. The comparison focuses on the effects on stiffness and ultimate strength of the panels and uses as a basis the preferred buckling mode imperfection for each lay-up configuration. Results demonstrate a conservative approach when adopting the preferred buckling mode shape for overall initial imperfections and a significant reduction on performance from localised imperfections.
AuthorsK Misirlis ; J Downes ; R S Dow
Date published2009
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Full-scale trials in varying depths of water on a King Class fast patrol vessel
AuthorsC Thew
Date published1988
AbstractA paper describing the full-scale trials carried out on a Royal Hong Kong Police `King Class' 26m semi-planning fast patrol boat at various depth/draft ratios between 2.96 and deep water over a range of Froude numbers between 0.3 and 0.8. Results are also given in one location for the effect on performance of varying displacement and for both inward and outward turning propellers. Reference is made to previous comprehensive trials carried out at the turn of the century on the HDMS Makrelen Sobjornen S.119 and HMS Cossack. Data are presented to enable preliminary powering calculations based on published information and that given in this paper. Finally comments are made on the present model tank and theoretical procedures for power predictions for this type of craft.
AuthorsC Thew
Date published1988
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Full-scale Trials on a Small High Speed Naval Craft With Focus on Slamming
AuthorsA Rosen ; O Rutgersson
Date published1998
AbstractAs a part of a co-operation project between the Division of Naval Architecture at KTH Stockholm and the Swedish Defence Material Administration full-scale trials have been performed on a small naval craft in rough seas. This paper is the first presentation of these trials. Characteristics of impacts puls lengths and rise times are discussed. Comparison is made between statistical distributions of peak values and therefrom derived Rayleigh distributions. A brief study is made on filtering of acceleration recordings. The results are used to verify computer simulations indicating that bow seas would give higher pressure magnitudes than head seas. Practical problems related to this kind of full-scale tests are discussed for example operational considerations when determining extreme levels for design criteria. Areas of further studies are exemplified e.g. simulations and correlations between pressure accelerations and structural response.
AuthorsA Rosen ; O Rutgersson
Date published1998
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Marine Accident Investigation Branch (MAIB) Report of the investigation into the lifeboat accident on board MV Hoegh Duke at Surabaya Sumatra on 20 August 1992
AuthorsMAIB
PublisherDepartment of Transport (DOT)
AbstractSix seaman were killed and the six others hospitalised when the aft hook slipped off its davit fall lifting ring as the starboard lifeboat was being lowered into the water. Recommendations of the report include advice to the managers Leif Hoegh & Co to improve safety on all their vessels and the need to review the use of on-load release hooks.
AuthorsDate publishedMAIB
1994
PublisherDepartment of Transport (DOT)
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On the prediction of hydrodynamic forces acting on a ship moving at constant drift
AuthorsN Sulficker Ali ; G Dhinesh ; K Murali et al.
Date published2005
AbstractEffects of incidence angle are important for all types of structures and vehicles including those for land sea air and space. Force and moment data for various angles of incidence play an important role in design. The effect of drift angle on a ship is investigated through towing tank tests and using CFD (computational fluid dynamics). Resistance and wave elevations obtained from the computational study are validated with experimental results. Detailed free surface mean velocity and pressure flow fields on the hull surface are obtained from the computational study for Fn ranging from 0.16 to 0.22 and for drift angle ß =0 5 and 100. The lateral force yaw moment and asymmetric flow characteristics are brought out in the computational study.
AuthorsN Sulficker Ali ; G Dhinesh ; K Murali et al.
Date published2005
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Safety at Sea Proceedings of the Second West European Conference on Marine Technology (WEMT) 23-27 May 1977
AuthorsWEMT
Shelf Location213e
AbstractConf held in London May 23 - 27 1977 Papers are Legislating for safety Analysis of world merchant ship losses 1967 - 1975 Structural design - safety and reliability considerations behind the classification society requirements IMCOs activities with particular reference to the impact on ship design Why unsafety at sea Safety art at sea - a problem of risk management New outlooks for guardians of safety - explicit versus implicit risk analysis on classification/ certification Automation and ship safety Stability of ships safety from capsizing and remarks on sub division and freeboard The prevention of cargo fires and explosions in oil tankers Lifeboats survival craft and launching methods Human factors in shiphandling Collision avoidance by manoeuvre The influence of navigational aids on traffic behaviour in converging areas in the entrance/exit of the English Channel Training for safety at sea On ship manoeuvrability and collision avoidance
AuthorsPublisherWEMT
Gresham Press
Shelf LocationDate published213e
1977
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Study of "re-melt" temper bead and polarity effects on porosity in the under freshwater wet welds
AuthorsEzequiel C P Pessoa ; Alexandre Q Bracarense ; Stephen Liu et al.
Date published2004
AbstractThe objective of this work is to discuss the influence of electrode polarity on bead-on-plate (BOP) welds and re-melt temper bead on the pores behaviour in the weld bead section of bead-on-grove (BOG) and bead-on-bead (BOB) welds. This article describes a study of the polarity effect in the underwater wet welding comparing the bead shape porosity arc stability and pores location in welds made with E6013 electrode at 50 and 100 meters depth under fresh water.
AuthorsEzequiel C P Pessoa ; Alexandre Q Bracarense ; Stephen Liu et al.
Date published2004
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Study on the learning method suitable for the engine room simulator based on personal computer
AuthorsKenji Ikenishi ; Toshio Hikima ; Tran Hong Ha et al.
Shelf Location213c
AbstractAlthough a lot of research has been carried out on the hardware of the pc-based ERS (engine room simulator) there is little research on the educational method using them. The first phase involved carrying out education and training by the discovery learning and the instruction learning and investigated learning outcomes. The results are described from considering the following matters: relation between the learning method and learning outcomes; the type of the error that students tend to commit; influence of the application order of the learning method; an instructor's role in the individual learning; improving points for increasing learning outcomes.
AuthorsDate publishedKenji Ikenishi ; Toshio Hikima ; Tran Hong Ha et al.
2004
Shelf Location213c
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The features of functional dependencies of wing's aerodynamic characteristics on their motion parameters and orientation relative to ground surface. The analytical representation of the airfoil outline and influence of the outline form on the aerodynamic
AuthorsV I Yushin
Date published2000
AbstractThe features of functional dependences of wings' aerodynamic characteristics on their motion parameters and orientation relative to the ground surface are considered. The basic methods for obtaining a WIG craft's aerodynamic characteristics are experimental and calculation methods which require the results to be represented as a finite number of loads and moments for specified parameters of orientation and motion of the craft relative to the ground surface. The analytical representation of the airfoil outline and the influence of the outline form on the aerodynamics of wings moving near the ground are discussed.
AuthorsV I Yushin
Date published2000
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The International Committee on Seafarers' Welfare: ILO convention 163 and recommendation 173
AuthorsR Rodriguez-Martos Dauer
Date published2005
AbstractWelfare facilities are sometimes still seen by some as something generous and philanthropic rather than as a necessary condition for maintaining a healthy efficient and safe crew. ILO convention 163 and recommendation 173 were adopted in 1987 as a response to the needs of welfare facilities on board vessels and in port. All those countries that ratified it assume responsibility for taking care of the welfare of any seafarers on board any vessel in their ports on board their own national ships. The development of this convention and recommendation are described in regard to the International Committee on Seafarers' Welfare created as an international umbrella organisation dedicated to the practical implementation of the International Labour Organisation instruments on Seafarers' Welfare.
AuthorsR Rodriguez-Martos Dauer
Date published2005
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An investigation of ballast water management methods with particular emphasis on the risks of the sequential method
AuthorsLefteris Karaminas
Date published2006
AbstractShips that carry large quantities of a particular cargo are invariably forced to spend time at sea without any such cargo. To achieve a seaworthy condition in terms of stability trim and strength seawater is taken on board to form the ballast condition. The IMO (International Maritime Organisation) has estimated that every year the world's fleet moves ten billion tonnes of ballast water around the world and that on average more than 3000 species of plants and animals are being transported daily around the world. Once these are introduced to local environment it is virtually impossible to get rid of them. This could have a permanent effect on the environment which could have a catastrophic effect on local fisheries. It is therefore imperative that the introduction of harmful aquatic organisms is prevented. LR (Lloyds Register) carried out an investigation on the various ballast water management methods with particular emphasis on the risks of the sequential method. Prompted by the fact that issues pertinent to the sequential method have not yet been fully appreciated by the industry LR began a two-part study using 26 existing ships of various types configurations and sizes.
AuthorsLefteris Karaminas
Date published2006
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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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Chord Stress Effects on Ultimate Strength of DT Tubular Joints
AuthorsD A Pecknold ; C C Ha ; W C Mohr
Date published1998
AbstractA new parametric strength prediction equation for compression DT joints subjected to chord stress is developed based on existing screened test data and on a new FE database that covers a wide range of joint geometries and significantly extends the information available on the effect of chord stress on static strength of compression DTs. This new strength prediction equation appears to provide a better fit to the data than either the current API RP2A (20th Edition) or IS0 proposed draft design guidance.
AuthorsD A Pecknold ; C C Ha ; W C Mohr
Date published1998
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Effect of crystal orientation on behaviour of columnar grained sea ice
AuthorsC Zhan ; E Evgin ; N K Sinha
Date published1994
AbstractA constitutive model accounting for the effect of crystal orientation on the mechanical behaviour of columnar grained sea ice is used to predict the sea ice behaviour. The effect of crystal orientation on deformation and strength of columnar grained sea ice is looked into. Comparisons between model predictions and available test data are given for the dependence of the uniaxial strength on the loading direction. Firstly the sea ice model is looked at. Next dependence of sea ice behaviour on crystal orientation is discussed.
AuthorsC Zhan ; E Evgin ; N K Sinha
Date published1994
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Effect of silt concentration on the cavitation NPSH curve of a centrifugal pump
AuthorsA Ladouani ; A Khaldi ; B Bekhti
Date published1995
AbstractAn experimental test rig is used to generate information on the effect of silt concentration on N.P.S.H. curves. Silt characteristics are provided. The test rig and the N.P.S.H. measurement procedure are described. The N.P.S.H results are presented. The effects of silt concentration on the cavitation flow rate and on the pump characteristic are discussed. Cavitation in centrifugal pumps discharging silt is accelerated due to rising silt concentration and flow rate leading to lower cavitation flow rates.
AuthorsA Ladouani ; A Khaldi ; B Bekhti
Date published1995
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Influence of seismic shooting on the lesser sandeel (Ammodytes marinus)
AuthorsArne Hassel ; Tor Knutsen ; John Dalen et al.
Date published2004
AbstractA field experiment on the effect of seismic shooting on the lesser sandeel (Ammodytes marinus) was conducted on the fishing grounds in the southeastern part of the North Sea in May 2002. The distribution and occurrence of sandeel within the seismic shooting region were quantified by grab sampling at night and acoustic surveying during daytime. Based on fishery statistics from the commercial sandeel trawlers operating in the vicinity of the experimental area trends in catch landings of sandeel during the experimental period were also explored.
AuthorsArne Hassel ; Tor Knutsen ; John Dalen et al.
Date published2004