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"Multimedia" on the ship's bridge - alleviating the impact of new technology on the mariner
AuthorsK P Dickens ; M J Dove
PublisherIMarE Conferences and Symposia
AbstractThe proposed development of a prototype multimedia training package to facilitate the introduction of new technology onboard ship is based on the findings of a questionnaire/survey (with supporting interviews) carried out to assess the attitudes of individual mariners to the introduction of specific items of equipment (GMDSS electronic charts combined radar/chart displays navigation systems) and to the learning aids provided (manuals software packages teachers experience).
AuthorsDate publishedK P Dickens ; M J Dove
1995
PublisherIMarE Conferences and Symposia
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On the effects of the slip stream on the mathematical representation of open propellers
AuthorsA Koumbis
Date published1984
AbstractA mathematical method for calculating the salient features of open propellers with an irregular balanced slipstream (with or without finite core tip vortex) is presented and compared with other published methods in worked examples. The method is based on approximations of the wake geometry. A propeller design procedure is outlined.
AuthorsA Koumbis
Date published1984
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On the influence of speed on the manoeuvring behaviour of a container carrier
AuthorsP Oltmann ; M S Chislett
Shelf Location213c
AbstractExtensive manoeuvring model tests for a modern post-Panamax container carrier are described examining whether the vessel will fulfill the interim IMO standards and considering the influence of speed on the manoeuvring performance. The model tests (zig-zag manoeuvres) were performed together with supplementary numerical simulations of turning circles and reverse spiral tests. The model tests and numerical simulations are discussed.
AuthorsDate publishedP Oltmann ; M S Chislett
1996
Shelf Location213c
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Precipitate effects on CGHAZ toughness of underwater weld on pipeline steels
AuthorsG Wang ; Y Shi
Date published1999
AbstractThe behaviour of the carbides and nitrides in X60 X65 and X70 pipeline steels (Ti-V-Nb microalloyed) during underwater welding and their effects on the coarse-grained heat-affected zone (CGHAZ) toughness are looked into. In-air welds are also produced for comparison purposes. After some background information the materials and the experimental procedure are considered. This is followed by discussion of the results.
AuthorsG Wang ; Y Shi
Date published1999
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Statistical analysis of two probabilistic models of ice accretion on overhead line conductors
AuthorsK Savadjiev ; M Farzaneh
PublisherInternational Society of Offshore and Polar Engineers
AbstractTwo probabilistic models of atmospheric icing on overhead transmission line conductors involving the combined wind-on-ice loads and the specification of radial ice thickness versus linear ice weight were analysed. A method for determining the combined wind- on-ice loads is proposed using the largest extreme distribution for icing and the Weibull distribution for wind speed. The specification of ice linear weight on conductors instead of ice radial thickness was proposed for probability based line design.
AuthorsDate publishedK Savadjiev ; M Farzaneh
1998
PublisherInternational Society of Offshore and Polar Engineers
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Symposium on the shaft driven generator system - on the high harmonies of thyrister type shaft driven AC generator system
AuthorsS Itano
Date published1982
AbstractThe generation of high harmonics associated with thyristor type shaft driven AC generators are discussed with consideration of - effects on rotating machinery radio equipment measuring instruments; the phenomena of electrostatic electromagnetic radio and conduction noise; and anti-noise countermeasures the converter and inverter systems.
AuthorsS Itano
Date published1982
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The effect of variation in hydrodynamic coefficients on the loading on jacket structures and the implications for tank testing
AuthorsM Abdelradi ; N S Miller
Date published1986
AbstractProcedures for the experimental and theoretical determination of wave loading on offshore structures composed of cylindrical members (such as jackets) are explained and relevant literature examined. Problems in obtaining satisfactory valves for the hydrodynamic coefficients of inertia drag and lift in scaling and in constructing adequate facilities for tank testing are discussed and recommendations made.
AuthorsM Abdelradi ; N S Miller
Date published1986
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9th International congress on combustion engines A
AuthorsCIMAC
Shelf Location225f
Abstract9th Intl conf held in Stockholm Sweden in 1971 Papers are Developments in control techniques for industrial gas turbines Fluidic injection system for turbochargers and gas turbines Residual oil and gas turbine fuel aspects on corrosion and deposites The application of gas turbines to the propulsion of liquefied natural gas tankers Designing reliability into heavy duty gas turbine controls 12MW industrial three-shaft gas turbine - turbine testing performance prediction and test results The causes of corrosion attack in gas turbines and possible preventive measures Control systems of gas turbine and helper steam turbine units Heat transfer in industrial gas turbine combustion chambers Recent developments in the use of heavy fuels in industrial gas turbines The design of a 3000 HP industrial gas turbine Feasibility and design of a large portable gas turbine facility for natural gas transmission The gas turbine and its influence on pollution of the environment Gas turbine for rail vehicles The development of turbochargers for diesel engines with a high degree of charging A systematic investigation on the corrosion of gas turbine materials at temperatures about 700 deg C by flue gases of impure fuel oils
AuthorsPublisherCIMAC
CIMAC
Shelf LocationDate published225f
1971
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A consideration on use of material grades for hull structural members based on fracture toughness
AuthorsH Yajima ; M Yamamoto ; K Qi et al.
Shelf Location213d
AbstractThe method to estimate allowable crack length is looked at. Next the use of material grades for hull structural members in NK rules and allowable crack length are considered. Assuming of required V-notch Charpy absorbed energy values is touched upon followed by assuming of allowable critical crack length. After this the proposed use of material members for hull structural members with thickness up to 80mm considering fracture toughness is discussed. Lastly a comparison is made between the current use of material grades for hull structural members in NK rules and the proposed one.
AuthorsDate publishedH Yajima ; M Yamamoto ; K Qi et al.
1998
Shelf Location213d
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Air quality and ventilation on ro-ro ferry vehicle decks - research recommendations and guidelines
AuthorsG L Reynolds
Date published1996
AbstractA programme of research undertaken by Lloyd's Register (LR) into air quality and ventilation on ro-ro ferry vehicle decks was designed to evaluate levels of nitric oxide (NO) nitrogen dioxide (NO2) hydrocarbons (HC) carbon monoxide (CO) particulates and polynuclear aromatic hydrocarbons (PAH). The performance of the mechanical ventilation systems and air flow distributions was also assessed and relationships between ventilation and air quality evaluated. Distinct air pollution patterns characterised discharge and loading profiles for particular cargo types but there was no consistent differences in overall air quality between summer and winter. Hand held CO monitors provided a good indication of spatial variability in exhaust fumes on passenger vehicle decks but not freight vehicle decks. The IMO Guidelines on the Design of Ventilation Systems in Ro-Ro Cargo Spaces and Operational Recommendations for Minimising Air Pollution in Ro-Ro Cargo Spaces are outlined.
AuthorsG L Reynolds
Date published1996
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An approach to calculate the probability of wave impact on an FPSO bow
AuthorsC Guedes Soares ; R Pascoal ; E M Antao et al.
Date published2004
AbstractThis work aims at characterizing the probability of wave impact and expected impact load on the bow geometry of an FPSO. In order to determine the instant when impact occurs an experimental program was performed on a specific bow shape. The bow was instrumented with pressure transducers and the test program also making use of video recordings was designed such that it was possible to determine the correlation between undisturbed wave shape and the impact pressure time traces. A comparison between the probability distributions of local wave steepness of the experimental undisturbed wave time trace and numerical simulations of second order wave theory is provided. The experimental results were further used to determine how the probability of impact varies with free surface vertical velocity. The proposed model for determining the probability of impact load is based on combining both models.
AuthorsC Guedes Soares ; R Pascoal ; E M Antao et al.
Date published2004
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An experimental study on flooding into the car deck of a ro-ro ferry through damaged bow door
AuthorsN Shimizu ; R Kambisseri ; Y Ikeda
PublisherElsevier
AbstractExperiments were carried out on a model ro-ro car ferry with a bow opening instead of a bow door. The model was run into regular head waves allowing only heave and pitch motions. The flooding of the car deck increased with the increase of bow opening size wave height and Froude number. The motions changed with the flooding. Theoretical calculations showed a heavy loss of (static) righting moment due to the shift of water on deck. The study suggests that a ship should be slowed down or stopped on damage to reduce or avoid further flooding. The experiment is detailed the results and analysis are presented and conclusions are drawn.
AuthorsDate publishedN Shimizu ; R Kambisseri ; Y Ikeda
2000
PublisherElsevier
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Analysis of hydrodynamic forces on a propeller blade of tunnel thrusters in bollard conditions
AuthorsIsao Funeno
Date published2006
AbstractTunnel thrusters comprise a propeller mounted inside a tunnel which is attached to vessels such as ferries container ships passenger vessels etc. In the past theoretical analysis of hydrodynamic performance of tunnel thrusters has been extremely difficult. In designing propeller blades of tunnel thrusters for hydrodynamics and strength it is necessary to accurately estimate hydrodynamic forces on the blades as external forces. In order to overcome these problems a new analysis method has been developed using CFD (computational fluid dynamics) based on RANS (Reynolds averaged Navier-Stokes') equations. An outline of this analysis method is described and computed results are verified by comparing them with measured data. Force-acting points on a blade during one revolution are also discussed. This method is shown to be a very useful and reasonable design tool for the propeller blades. Results are presented and discussed and conclusions are drawn.
AuthorsIsao Funeno
Date published2006
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Analysis of wave run-up measurements on a mini-TLP
AuthorsI A Sibetheros ; J M Niedzwecki ; P Teigen
Date published2005
AbstractWave run-up on deepwater offshore structures may contribute to wave overtopping of the platform deck. It may also cause undesirable loads including impact loads on the underside of the deck when combined with other hydrodynamic phenomena beneath the platform deck. In this study a 1:40 scale model of an unmanned mini-TLP design was subjected to a series of design sea environments for the Gulf of Mexico. Complimentary testing of compliant and fixed hull configurations was performed and the wave run-up was measured at several locations around the hull in both head and quartering sea orientations of the platform. The wave elevation data reported here was obtained at three critical points on the hull and a reference wave gage well upstream of the model. Analysis of the data was performed using an orthogonal third order Volterra series system analysis technique. The wave run-up measurements were compared and correlated to the incident wave elevation measurements.
AuthorsI A Sibetheros ; J M Niedzwecki ; P Teigen
Date published2005
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Automated knuckle detection in ship hull forms
AuthorsRobert Bronsart ; Gernot Kneiling
Date published2006
AbstractIn the early design stages of ship hulls computer-based methods are used to check improve and compare multiple design alternatives. In the field of fluid dynamics increasing ship speeds place emphasis on the reduction of resistance. Codes based on potential flow theory are used to estimate and analyse the flow around the ship's hull and to determine the wave-induced resistance. The distribution of panels on the hull has a significant impact on the accuracy of the overall power prediction. Creating the panels on the hull surface especially for modern hull forms is a resource intensive non- or semi-automated task requiring a profound experience-based knowledge. The time needed for the manual definition of the mesh is high. No methods are known at present for automatically creating panel discretisations of ship hull forms. Mesh generation methods for potential flow calculations require appropriate descriptions of the ship hull surface. The IGES standard is a widely used format in the shipbuilding industry for the exchanges of ship hull forms. Methods are presented here to prepare ship hull form descriptions based on IGES files which are later used for potential flow calculations. Two major problems are solved: topology recovery and knuckle detection.
AuthorsRobert Bronsart ; Gernot Kneiling
Date published2006
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Benchmarking of truss spar vortex induced motions derived from CFD with experiments
AuthorsJohn Halkyard ; Senu Sirnivas ; Samuel Holmes et al.
Date published2005
AbstractThe authors have been investigating the use of CFD as a means for predicting full scale vortex induced motions (VIM) performance and for facilitating the design of spars for reduced VIM. This paper reports on the results of a study to benchmark the CFD results for a truss spar with a set of model experiments carried out in a towing tank. The focus is on the effect of current direction reduced velocity and strake pitch on the VIM response. The tests were carried out on a 1:40 scale model of an actual truss spar design and all computations were carried out at model scale. Future study will consider the effect of external appurtenances on the hull and scale-up to full scale Reynolds' numbers on the results.
AuthorsJohn Halkyard ; Senu Sirnivas ; Samuel Holmes et al.
Date published2005
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Cargo securing manual : A guide to owners
AuthorsLloyd's Register
Shelf Location230d
AbstractThis example Cargo Securing Manual is based on the Draft Guidelines for the Preparation of the Cargo Securing Manual, MSC/Circ.745. The purpose of this example is to provide guidance to those involved in the preparation of Cargo Securing Manuals, i.e. guidance to the master and crew on board the vessel with respect to the proper stowage and securing of cargo units, suggesting appropriate wording and highlighting the details and information to be included. Contents Securing devices and arrangements, with specifications for fixed and portable cargo securing devices and inspection and maintenance schemes; and Stowage and securing of non-standardised and semi-standardised cargo, with parts on handling and safety instructions, evaluation of forces acting on cargo units, and application of portable securing devices on various cargo units, vehicles and stowage blocks. There is a floppy disk in a pouch on the inside of the front cover which contains the IMO Guidelines for the Preparation of the Cargo Securing Manual, and the Lloyd's Register Example Cargo Securing Manual.
AuthorsPublisherLloyd's Register
Lloyd's Register
Shelf LocationDate published230d
1996
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Case study: effects of wind loading on structural reliability
AuthorsEmmanuel Fakas ; Suhartodjo Tuty ; Beverley F Ronalds et al.
Date published2001
AbstractThe effect of wind loading on structural reliability under storm overload is investigated for a number of minimum facility platforms on the North West Shelf. The long term distribution of environmental loading and consequently the structural reliability is seen to be highly sensitive to wind loading for platforms in very shallow water where the high return period wave heights are limited by breaking waves. The wind loading contribution to the total platform loading is further investigated for a typical minimum facility platform for a range of water depths topsides weights and substructure effective diameters. Critical design conditions are thus highlighted for which a realistic assessment of structural reliability is highly dependent on the accuracy of the wind loading estimation.
AuthorsEmmanuel Fakas ; Suhartodjo Tuty ; Beverley F Ronalds et al.
Date published2001
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Comparison of results of impact tests on laboratory and natural freshwater ice with hydrodynamic model predictions
AuthorsV Likhomanov ; I Stepanov ; R Frederking et al.
PublisherInternational Society of Offshore and Polar Engineers
AbstractAn extensive series of drop impact tests were carried out previously by the Arctic and Antarctic Research Institute on natural ice and by the National Research Council of Canada on laboratory ice. The data from both test locations were analysed by a hydrodynamic model of impact of a rigid body on ice. The ice impact crushing strength showed consistency and similar trends. Impact strength decreased with increasing temperature. Further development of the model is considered.
AuthorsDate publishedV Likhomanov ; I Stepanov ; R Frederking et al.
1998
PublisherInternational Society of Offshore and Polar Engineers
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Contract designs for ballast water treatment systems on containership 'R J Pfeiffer' and tanker 'Polar Endeavor'
AuthorsW L Hurley ; S S Schilling ; T P Mackay
Date published2001
AbstractThe Great Lakes Ballast Technology Demonstration Project recently funded three six-month full-scale design studies of promising ballast water treatment systems. The aim of each study is to fully develop for a specified 'target' vessel the contract design and life-cycle cost of a reliable optimised flow-through on-board treatment system that effectively removes living organisms from a ship's ballast water before it is discharged into an ecosystem other than its original source. Two of these three studies are examined and two different kinds of target vessels are selected. This is one of the first efforts devoted to developing contract design level technical solutions quantifying life-cycle costs and assessing actual vessel operational impacts on effective ecosystem maintenance. Diagrams appear on pages 19-21.
AuthorsW L Hurley ; S S Schilling ; T P Mackay
Date published2001