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A new model on equilibrium spectrum of wind waves
AuthorsY Liu ; P A Hwang ; M-Y Su et al.
PublisherInternational Society of Offshore and Polar Engineers
AbstractBased on the joint-distribution of wave amplitude and wave period a new model on the equilibrium spectrum of wind waves has been derived. The model was related to wind speed spectral width and wave age. The model can be used to explain variability of spectral level and spectral curve slope.
AuthorsDate publishedY Liu ; P A Hwang ; M-Y Su et al.
1998
PublisherInternational Society of Offshore and Polar Engineers
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A probabilistic estimate of extreme value loads on transverse water tight bulkheads
AuthorsBaidurya Bhattacharya ; Roger Basu ; Sanjay Srinivasan
Date published2004
AbstractStructural integrity of watertight bulkheads (WTBs) is critical for ship survivability in the event of hull damage. Design procedures for WTBs are based on empirical and prescriptive description of loads. This paper outlines the development of a physically-based probabilistic model of transverse WTB loads as an essential input to reliability analysis. The emphasis of this paper is on the probabilistic modeling of loads; hence simple phenomenological expressions of load components are used to underline the cause and extent of randomness in WTB loads. A response surface type approach is suggested for determining ship-specific model parameters.
AuthorsBaidurya Bhattacharya ; Roger Basu ; Sanjay Srinivasan
Date published2004
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A quantitative measure of sea-state effect on small autonomous underwater vehicle motion in shallow water
AuthorsP E An ; S M Smith ; S E Dunn et al.
Date published1996
AbstractPreliminary experimental data and analysis on underwater vehicle motion and wave/currents is provided. First the basic background is given including a description of TSK fuzzy-logic controller. Next the at-sea experiment is looked at. Here vehicle motion and seaway data collected on three different occasions off the coast of South Florida during which the Ocean Voyager II was chosen as a free-swimming motion platform are presented. Lastly sensor noise filtering is discussed.
AuthorsP E An ; S M Smith ; S E Dunn et al.
Date published1996
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A study of drag coefficients for truss legs on self-elevating mobile offshore drilling units
AuthorsN P Smith ; D B Lorenz ; C A Wendenburg et al.
Date published1983
AbstractMethods for predicting drag coefficients for truss legs on self-elevating/jackup offshore rigs are described (ABS DNV BSI) as is an improved technique developed by Marathon Marine Engineering Co. Texas and based on a building block approach with allowance for shield- ing and orientation. Supporting wind tunnel evidence is included with worked examples for legs of square and triangular cross section.
AuthorsN P Smith ; D B Lorenz ; C A Wendenburg et al.
Date published1983
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A study on the accuracy of gun deep hole drilling for marine part materials
AuthorsS-B Sim ; T-O Jun
PublisherInternational Society of Offshore and Polar Engineers
AbstractGun drills and bores are single lip end cutting tools which drill or bore a hole in a single pass. The effects of tool behaviour on machined hole profile in deep hole gun drilling have been analysed by the method of tool vibration and its alignment analysis. The study also dealt with results obtained during gun drilling on S45C steels under different conditions. The roundness cylindricity surface roughness and straightness were influenced by cutting speed and feedrate chip flow and tool wear.
AuthorsDate publishedS-B Sim ; T-O Jun
1998
PublisherInternational Society of Offshore and Polar Engineers
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Accident prevention - focus on the human element
AuthorsR Prasad
PublisherInternational Maritime Lecturers Association (IMLA)
AbstractThe ISM (International Safety Management) Code and the revised STCW Convention (International Convention on Standards of Training Certification and Watchkeeping) both aim at improving safety of life and ships and the protection of the marine environment by focusing on the human element through quality of management and people. Aspects considered include casualty investigations and corrective action qualifications of seafarers communications maritime education and training.
AuthorsDate publishedR Prasad
1999
PublisherInternational Maritime Lecturers Association (IMLA)
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An Australian youth perspective on sustainable fisheries and marine protection in the Australasian and Pacific regions
AuthorsDylan Furnell
Shelf Location213e
AbstractThis paper focuses on the author's views as an Australian youth of the importance of implementing the law of the sea in relation to the protection of marine environments and species in particular on the high seas the deep oceans and Antarctica. The presentation discusses some national and regional arrangements in Australia and neighbouring states designed to implement strategies for the sustainable management of important fish species and the implementation of marine protected areas in the high seas and the deep ocean.
AuthorsDate publishedDylan Furnell
2007
Shelf Location213e
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An Experimental Investigation into the Influence of Wake on Cavitation
AuthorsW E Ball
Date published1989
AbstractExperiments studying the cavitation behaviour on a propeller operating in several different velocity fields are described and their results presented. The flow fields generated comprise uniform flow crossflow alone and different crossflows with different axial velocity decrements. The cavitation behaviour viewed includes inception of the different forms extent and thickness of the developed sheet cavitation and variation of cavity extent as the propeller rotated through the velocity fields. Chief influences of surface ship wake on propeller cavitation are discussed.
AuthorsW E Ball
Date published1989
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Architectura Navalis Mercatoria, Treatise on Shipbuilding (reprint of 1820 edition)
AuthorsFredrik Henrik af Chapman
Shelf Location230a
AbstractThe book contains 62 engravings depicting vessels and craft from Sweden (of which Chapman was a native) and abroad. Some were designed by Chapman himself, but many were vessels or types which he had encountered on his travels or seen around him. The book covers everything from warships to cargo boats and small fishing craft. The accompanying text, including the preface to his later work Tractat om Skeppa-Byggeriet (Tract on Shipbuilding) of 1775, is written in German.
AuthorsPublisherFredrik Henrik af Chapman
VEB Hinstorff Verlag Rostock
Catalogue number720.305
Shelf LocationDate published230a
1820
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Assessment of ship manoeuvrability based on IMO resolution No.A.751
AuthorsC-G Kang ; J-H Kim ; M S Chislett
Shelf Location213c
AbstractIn 1993 IMO's resolution No.A.751 on ship manoeuvrability was adopted. Sea trial data carried out in Korean ship yards was collected and analyzed based on the Interim Standards for Ship Manoeuvrability (1993) and the Explanatory Notes to the Standards (1994). The analysis of the data base showed that the criteria in the standards are not so strict for ships built during the last few years. Some suggestions are made arising from the analysis of the data base and the application of the criteria.
AuthorsDate publishedC-G Kang ; J-H Kim ; M S Chislett
1996
Shelf Location213c
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Computer on board system - the way of increasing the ship effectiveness and safety
AuthorsP Kolev ; M Tzenkov ; P Georgiev et al.
Date published2000
AbstractResults of investigations into computer on-board loading systems are discussed. The increase in economical effectiveness and environmental protection is emphasised. Computer control of the damage stability of chemical tankers and of the safe loading and unloading of bulk carriers is considered. Direct strength calculations of cargo deck hatch covers under container loading are examined.
AuthorsP Kolev ; M Tzenkov ; P Georgiev et al.
Date published2000
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Crude oil technology - impact on surveying of research into properties of crude oil
AuthorsT Gunner
Date published2001
AbstractThis paper consists of some 15 pages of overhead transparencies used at the conference. These look at the impact on surveying of research into the properties of crude oil. The MATCO (marine transportation of crude oil) programme is introduced followed by a Norwegian maritime research programme on the marine transportation of crude oil. After this CRUCOGSA (the physical behaviour of crude oil influencing its carriage by sea) project is introduced together with its findings.
AuthorsT Gunner
Date published2001
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Development of a methodology to assess the impact of design performance parameters on offshore emergency management
AuthorsM N Lyons ; J E Strutt ; K Allsopp et al.
PublisherERA Technology Report
AbstractCranfield University has developed a Task Performance Resource Constraint (TPRC) model which provides a foundation for estimating the probability of success in emergency management tasks. The TPRC model concept is introduced. The way in which data from emergency management exercises can be used together with conceptual design data on parameters like intensity duration and escalation rate to assess the impact of design on successful emergency management is described with examples.
AuthorsDate publishedM N Lyons ; J E Strutt ; K Allsopp et al.
1998
PublisherERA Technology Report
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Dissolved gas and nuclei effects on tip vortex cavitation inception and cavitating core size
AuthorsS Gowing ; L Briancon-Marjollet ; D Frechou et al.
Date published1995
AbstractTip vortex cavitation on an elliptical NACA0020 foil is tested in the Grand Tunnel Hydrodynamic (GTH) in water with various dissolved gas and nuclei contents. The tunnel nuclei injection and filtering systems enable the dissolved gas and nuclei effects to be tested independently. Four different qualities of water are used in the GTH to study free nuclei and dissolved oxygen content effects on tip vortex cavitation inception. A novel imaging system has been developed to measure the cavitating vortex core size allowing quantification of the core growth from diffusion effects over time.
AuthorsS Gowing ; L Briancon-Marjollet ; D Frechou et al.
Date published1995
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Effect of deluge on explosions: FLACS simulations compared to full-scale experiments
AuthorsK van Wingerden ; O Hansen ; P Foisselon et al.
Date published1998
AbstractA water deluge system that is activated on gas detection is a promising way of mitigating gas explosions. The effect of water spray on flame propagation in a congested environment is described and the way in which this scenario is modelled by the computational fluid dynamics tool FLACS is briefly considered. Two full-scale explosion experiments are compared with FLACS predictions. It was found that the agreement between experiment and prediction was better for a general area deluge than for a water curtain.
AuthorsK van Wingerden ; O Hansen ; P Foisselon et al.
Date published1998
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Effect of intake air condition on NOx emission from two-stroke marine diesel engine
AuthorsT Tsukamoto ; K Ohe ; H Okada
Date published1995
AbstractThe measurement of NOx emission from a two-stroke low-speed marine diesel engine was carried out changing the temperature and humidity of the scavenging air. Effects of scavenging air temperature and humidity on NOx emission are looked at on the basis of experimental results. The effect of room temperature is also studied using a comparison of the data gained in winter with the data obtained in summer. The experimental apparatus is reviewed and the experimental results are given.
AuthorsT Tsukamoto ; K Ohe ; H Okada
Date published1995
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Effects of mooring line dynamics on position keeping of a floating production system
AuthorsS Hong ; S Y Hong
Date published1997
AbstractA parametric study is conducted on the coupled dynamics of floating structure and its mooring system in order to investigate the effects of mooring lines damping on slow drift motion of floating vessel. The object of the parametric study is turret moored production system (TPS) with a tanker of 124400 ton. Firstly a look is taken at the simulation method covering equation of motion mooring line analysis contact model of mooring line and numerical integration method. After this the numerical simulations are discussed.
AuthorsS Hong ; S Y Hong
Date published1997
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Effects of the three dimensionality of a ship's hull on the wave impact pressure
AuthorsI Watanabe
Date published1988
AbstractA paper describing a general expression for the impact pressure distribution on a flat-bottomed ship making slamming motion in waves. This is derived by matched asymptic expansion on the bases of the shallow draft and the gravity free assumptions. 3-D flat plate formulation is utilized to have the solution in the outer region.
AuthorsI Watanabe
Date published1988
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Electric Drives on Ships and Oil Platforms
AuthorsR Yacamini ; L Hu ; I D Stewart
Date published1992
AbstractThis paper examines the different types of drives found on offshore platforms and ships. Comparisons of voltage-fed and circuit-fed drives are discussed with the problems in defining operating conditions on d c drives. A power chart approach similar to that used for synchronous generator operation is introduced. Time domain models and the use of the Saber software package is described as well as the parameters which are required in the design of a successful ship or platform electrical system.
AuthorsR Yacamini ; L Hu ; I D Stewart
Date published1992
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Experimental Investigation of a Model Jack-Up Unit on Clay
AuthorsG Vlahos ; C M Martin ; M J Cassidy
Date published2001
AbstractThis paper presents results from a series of 1-g experiments conducted on a scaled three-legged jack-up unit model equipped with spudcan footings on soft clay. The model rig is subjected to combined vertical and horizontal loads at the hull level resulting in combined vertical moment and horizontal loads at the footings. The physical tests explore the load redistribution among the spudcan footings hull and footing displacements at failure and ultimate system capacity. Experimental observation of rotational footing fixity is also emphasized.
AuthorsG Vlahos ; C M Martin ; M J Cassidy
Date published2001