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The impact of the Ocean Shipping Reform Act on liner shipping
AuthorsH J Creel
PublisherLloyd's List Events
AbstractThe impact of recent legislation in the United States on the liner shipping industry is addressed. Changes brought about by the Ocean Shipping Reform Act of 1998 (OSRA) are discussed. The FMC's (Federal Maritime Commission) ongoing efforts to assess the impact of OSRA future efforts and reactions of various segments of the ocean shipping industry to OSRA are described. OSRA's changes to the 1984 Shipping Act have resulted in an ocean transportation system that relies more on the marketplace and less on government intervention. It covers service contracts between carriers and customers and has affected rates and services due to market forces.
AuthorsDate publishedH J Creel
2000
PublisherLloyd's List Events
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Time-variant ultimate strength reliability of FPSOs including corrosion and slamming effects
AuthorsIoannis Moatsos ; Purnendu K Das
Date published2005
AbstractThis paper discusses the effects of corrosion and slamming on Floating Production Storage and Offloading (FPSO) structures in the North Sea by using a time variant structural reliability based approach. An FPSO structure currently in operation in the North Sea is analysed an analytical approach is suggested and used to determine the Ultimate Strength of the FPSO structure and compared with other published methods. A non-linear corrosion method is then used to determine the effect of corrosion on the ultimate strength and subsequently in the reliability of the structure. Slamming loads on the midship section of the FPSO are calculated using closed form expressions. The effect of slamming and green water load on the overall vertical bending moment applied on the structure is combined with the vertical wave bending and still water loads using the Ferry Borges-Castanheta method and the SRSS rule to provide the distribution and variation of a loading component for structural reliability analysis to be performed. Time variant reliability analysis using Monte Carlo Simulation is then used to determine reliability indices and probabilities of failure for the structural system analysed on a component level.
AuthorsIoannis Moatsos ; Purnendu K Das
Date published2005
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Two years of acceleration measurements on Dock Express heavy lift ships compared with predicted values from several desing methods
AuthorsA B Aalbers ; C Leenaars
Date published1988
AbstractFull scale measurements of cargo acceleration were carried out on three specially instrumented Dock Express Heavy lift ships during two years commercial trading on Japan-Middle East routes in many sea conditions. Extensive long and short term statistical analysis of the results are compared with predictions made by commonly used theoretical design methods (including `rules of thumb' DnV RP 2-design diagrams response calculation from model tests and the LONGEX wavescatter programme). A design method based on measure acceleration climate of a given trade ro route is proposed.
AuthorsA B Aalbers ; C Leenaars
Date published1988
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Update on the constantly changing shipyard market - impact on the newbuild market
AuthorsM Stopford
Shelf Location213a
AbstractA review of shipbuilding at the end of the 1980s through 1990s and into the 21st century is given. Issues facing the shipbuilding industry are essentially the same as 10 years ago. These include 1970s fleet replacement for which IMO (International Maritime Organisation) has produced a revision of Regulation 13G setting out a phase-out schedule ship building capacity and prices. The growth of regional shipbuilding capacity and contribution from Japan Korea and Europe are considered. The decline in shipbuilding prices during 1990s is discussed. Predictions for tankers bulk carriers and containerships and for shipbuilding capacity are made.
AuthorsPublisherM Stopford
IBC UK Conferences Ltd
Shelf LocationDate published213a
2000
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Using simulator equipment for increasing the motivation of young students
AuthorsAndrea Marchesi
Date published2005
AbstractNautical education in Italy is based on a very peculiar scheme compared to the rest of Europe. The present educational project called Nautilus is based mainly on basic theoretical scientific knowledge. Students aged 14-19 attend a nautical high school and are taught both general and nautical-related subjects. After school examinations and mandatory STCW95 courses professional training is carried out during on-board service. However in recent years teachers have had problems with students losing motivation and not wishing to continue their training on board. Nowadays only about 10% of students graduating go on board. A project is presented which was developed to address these problems. The project aims to develop a Simulation Centre for the Deck Department and Engine Department. Simulator equipment is usually used to train the trainee in dangerous situations or in particular scenarios. Here however the purpose is to use the simulator equipment for normal watch keeping activities. The idea is to offer 4 hours on the bridge or engine control room to check the behaviour of all the equipment without any particular problems. The students' activities would be recorded and filmed for discussion and assessment in the debriefing.
AuthorsAndrea Marchesi
Date published2005
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A theoretical study on the effect of seaquakes on a two-dimensional floating body
AuthorsY Higo
Date published1997
AbstractA reasonable numerical calculation method of seismic wave propagation in two-layered medium is presented. The hydrodynamic pressure caused by seaquake is analyzed numerically and its dynamic effects on the floating structure is investigated. First some background information is given. Next a look is taken at the problem formulation. After this the numerical results are discussed.
AuthorsY Higo
Date published1997
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Effect of principal stress direction on undrained cyclic shear behaviour of dense sand
AuthorsKen-ichi Sato ; Nobuo Yoshida
Date published1999
AbstractA series of undrained cyclic torsional shear tests using dense sand specimens with bedding planes have been conducted to investigate the effect of initial fabric anisotropy on liquefaction characteristics. After some introductory information attention is given to the test procedures. Next a look is taken at the effect of cyclic stress ratio on cyclic shear characteristics followed by the effect of principal stress direction on undrained cyclic shear characteristics. Lastly consideration is given to the effect of principal stress direction on cyclic shear strength.
AuthorsKen-ichi Sato ; Nobuo Yoshida
Date published1999
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Hydrodynamic force on a wall due to breaking waves
AuthorsJ-J Shu ; A T Chwang
Date published2000
AbstractThis paper studies the impact forces of breaking waves on a rigid wall based on a nonlinear potential-flow theory. This is a model problem for some technologically important design issues such as the impact of breaking waves on ships coastal and offshore structures. We are interested in the short time successive triggering of nonlinear effects using a small-time expansion. The analytical solutions for the impact force on a rigid wall and the free-surface profile are derived.
AuthorsJ-J Shu ; A T Chwang
Date published2000
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Hydrodynamic loading of compact structures and the effect on foundation design
AuthorsA R Henderson ; M B Zaaijer
Date published2002
AbstractAttention is given to various methods to calculate wave loading on compact structures and the effect of hydrodynamic loading on the foundation design solution based on a case study of a 3 MW turbine at a Baltic site. After some introductory information a look is taken at hydrodynamic loading. Next resistance factors are considered followed by load and resistance factor analysis. Effects of hydrodynamic modelling on design solution are dealt with and recommendations are made.
AuthorsA R Henderson ; M B Zaaijer
Date published2002
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Impact on emission legislation on large engine design and operation Publication 475
AuthorsH Niven
Date published1992
AbstractDiesel engines achieve the best thermal efficiency of any prime mover. The high efficiency of the diesel engine is a result of high cylinder pressures used which creates high temperatures that burn hydrocarbon fuels used. The resultant combustion process is very clean. This paper describes the constituents of diesel engine exhaust its effect on the environment and the reduction strategies employed at present to meet stringent emission levels.
AuthorsH Niven
Date published1992
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Irregular broken wave forces on vertical wall
AuthorsY-C Li ; D-z Liu ; G-p Qi et al.
Date published1997
AbstractA technique to calculate total horizontal wave forces by irregular broken waves on vertical wall has been developed. This is based on physical model test dimensionless analysis and assessment of real construction. Also the method to determine pressure distribution of horizontal forces on vertical wall in addition to uplift forces on the bottom of the wall is recommended. There is fairly good agreement between the results calculated by this method and real construction.
AuthorsY-C Li ; D-z Liu ; G-p Qi et al.
Date published1997
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Numerical study on breaking indices for solitary wave on slopes
AuthorsC R Chou
Date published2001
AbstractThe shoaling and breaking of solitary waves propagating on various types of mild slope is investigated. The breaking criterion of these waves is studied using the boundary element method. Suggestions of breaking indices for slopes 1:10 to 1:50 are given. The deformation of wave profiles as well as the distribution of fluid velocities at the breaking region for slopes 1:30 to 1:50 are shown. The classification of surging breakers and spilling breakers is explained.
AuthorsC R Chou
Date published2001
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on relation between flow behaviour and the lateral force distribution acting on a ship in oblique motion
AuthorsBart van Oers ; Serge Toxopeus
Date published2006
AbstractThis paper presents the results of a research project focussed on the simulation of the viscous flow fields around five vessels sailing at a non-zero drift angle. The calculated flow fields were used to investigate flow features relevant to the lateral-force distribution thus offering insight in the physics involved in the manoeuvring behaviour of ships. This insight can be used to improve the manoeuvring characteristics in the early stages of the design process.
AuthorsBart van Oers ; Serge Toxopeus
Date published2006
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Study on stern tube sealing system (blister of sealing ring)
AuthorsS Yamajo
Date published1983
AbstractThe failure of stern tub sealing systems due to blister formation on the lip ring seal was investigated by - observations on the occurance of blisters in conventional and improved type sealing rings analysis of their contents structure and material homogenity; and by laboratory studies on conditions (temperature pressure eccentricity speed environment) affecting the formation of blisters on test pieces (nitrile-butadiene rubber and fluorocarbo rubber) in simulated service conditions. Results are used to propose a mechanism of blister formation and to discuss preventive measures.
AuthorsS Yamajo
Date published1983
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Wave slamming forces on horizontal circular cylinders in intertidal zone
AuthorsV Hariprasad ; S Neelamani ; R Sundaravadivelu
Date published2004
AbstractExperiments are conducted for single and twin cylinders of circular cross sectional shapes. The effect of tidal variation on slamming forces needs thorough investigation. The comparison of single circular cylinder and twin circular cylinder with a clear spacing equal to diameter of cylinder in regular waves is considered in this paper. The detailed experimental procedure analysis and discussion on the results on wave slamming force on the cylinders are reported in this paper.
AuthorsV Hariprasad ; S Neelamani ; R Sundaravadivelu
Date published2004
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Conf on - The Effect of IMCO Pollution Regulations on Shipping 5 Dec 1974
PublisherIMarE Conferences and Symposia
Date published1974
PublisherIMarE Conferences and Symposia
Date published1974
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Department of Education & Science Report on the Committee on Technician Courses and Examinations
AuthorsDES
PublisherHMSO
AuthorsDate publishedDES
1969
PublisherHMSO
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Report on the investigation of NOTTINGHAM PRINCESS striking Trent Bridge Nottingham on 15 November 2002
AuthorsMarine Accident Investigation Branch
Shelf Location40d
AuthorsCatalogue numberMarine Accident Investigation Branch
UNK
Shelf Location40d
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Special Symposium on Ocean Measurements and Their Influence on Design Session
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The influence of different scenarios of supply ship collision on the dynamic response of a North-Sea jacket-pile-soil system
AuthorsM Reza Emami Azadi
Date published2007
AbstractThe offshore industry's experience in the past 20-30 years indicates that due to frequent traffic of supply ships around the offshore platforms the probability of occurrence of collision with such vessels is relatively high. The influence of various scenarios of supply ship collisions is investigated. In a previous study on ship impact on an 8-leg North-Sea Jacket Platform by Amdahl et al and also other studies the effect of jacket pile-soil interaction was not considered. Several supply ship collision analyses are carried out for bow stern and broadside impact scenarios on an 8-leg North-sea Jacket platform. It is observed that by taking into account the jacket-pile-soil interaction effects in particular in softer clay soils the amplitude of displacement response after supply ship impact at the deck level is increased due to yield in the upper soil layers. Contrary to this finding less linear dynamic effects can be seen in the studied jacket-pile-soil system subjected to the supply ship impact. It can also be concluded that for a soft impact scenario the dynamic effects in the global response of the platform located in the mainly OC clayey soil may be much less than those for hard impact scenario on the same platform. For instance for a brace impact at its mid-span a less significant dynamic effect has been observed than for a leg impact. The duration of impact in such cases is shown to play an important role in determining the dynamic influence of the platform response. The relative energy absorption of the platform is shown to be more for broadside loadX23134 The influence of diffraction on the stability assessment of ships
AuthorsM Reza Emami Azadi
Date published2007