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Investigation into the amounts of residue remaining on board a chemical tanker after cargo discharge and subsequent tank washing procedures
AuthorsN Hurford ; J A Nichols
Shelf Location226a
AbstractThis report describes experiments carried out on an ocean going chemical parcel tanker to determine typical residues remaining on board (Rob) and to investigate present tank washing procedures. The results are presented and an empirical formula is derived for the calculation of ROB’s for this type of ship.
AuthorsPublisherN Hurford ; J A Nichols
Department of Industry
Shelf LocationDate published226a
1977
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Laboratory study on the interaction between regular obliquely incident waves and vertical walls
AuthorsYu-cheng Li ; Zhao-chen Sun ; Guo-hai Dong et al.
Date published2001
AbstractCharacteristics of wave forces by waves are studied based on a physical model test with regular waves. The ratio of obliquely incident wave forces to normal incident wave forces on unit length of vertical wall is related with various factors. A linear reduction of the mean force of obliquely incident waves is confirmed with an increase in the relative caisson length. Also the characteristics of reflection coefficients of diagonal waves are discussed.
AuthorsYu-cheng Li ; Zhao-chen Sun ; Guo-hai Dong et al.
Date published2001
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Marine environment and its impact on the design of ships and marine structures
AuthorsM K Ochi
Date published1993
AbstractInformation on environmental conditions (wind waves and currents) relevant to the design and safe operation of ships and marine structures is summarised. Results of the author's recent study on stochastic properties and prediction of severe environment pertinent to design application are presented. Finally data and methodologies for providing a uniform source of information are included.
AuthorsM K Ochi
Date published1993
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Mechanical Systems Modeling and Diagnosis Based on Cases
AuthorsS Karamouzis ; S Feyock
Date published2000
AbstractDiagnosis of complex mechanical systems is a challenging task especially when the systems are in operation. This paper presents an approach that it is based on temporal models and case-based techniques. At the core of this approach is retrieval and adaptation of previously experienced problems (cases) similar to the problem at hand. Unlike other approaches this paper presents a common mathematical framework in which mechanical system modeling and case-based diagnosis can be described. Based on this framework a prototype system for dealing with aircraft engine faults has been designed and implemented.
AuthorsS Karamouzis ; S Feyock
Date published2000
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Neftegorsk Earthquake 28 May 1995 Sakhalin Island
AuthorsV V Kharakhinov ; S G Litvinov ; S P Beketsky
Date published1997
AbstractOn 28 May 1995 the Neftegorsk Earthquake took place with magnitude of 7.6 degrees (on Richter scale) on a large part of the territory of Sakhalin Island and on the territory of Khabarovsk Region. It caused terrific consequences in Neftegorsk (being nearest the epicentre) caused visible changes of landscape and led to place damages (breaks) of oil and gas pipelines power lines and numerous serious damages of the narrow-guage railway Okha-Nogliki on a section from Mukhto to Garomay. The earthquake and fault-lines in the region are discussed.
AuthorsV V Kharakhinov ; S G Litvinov ; S P Beketsky
Date published1997
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Nonlinear irregular waves and forces on truncated vertical cylinder in a numerical wave tank
AuthorsS Y Boo ; C H Kim
Date published1997
AbstractA numerical scheme has been developed to predict nonlinear diffractions acting on a floating structure by weakly nonlinear irregular waves. The proposed numerical scheme was verified by comparing linear results with theory and then applied to compute the diffractions acting on a truncated vertical cylinder by inputting the linear and nonlinear irregular waves. Also the numerical scheme was studied by the balance check of the momentum-impulse.
AuthorsS Y Boo ; C H Kim
Date published1997
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Numerical study on forced turbulence in stratification
AuthorsToru Sato ; Kei Sato
Date published2003
AbstractA method for computational reconstruction of fluctuating flows in the small-scale ocean was proposed based on single-point measurement in the real sea. Full-3D LES on the spatial scale of O(100m) is conducted for this purpose. Small-wavenumber components of fluctuation are forced in the whole computational domain and large-wavenumber components evolve freely in the computation. The reconstruction of spatial information from the time-sequential data obtained at a single measurement point is theoretically impossible with no assumptions. Spherically even distribution of energy for large eddies is assumed. The numerical results are compared with the measurement in the time domain and their validity is discussed.
AuthorsToru Sato ; Kei Sato
Date published2003
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On-Sea Experiment and Hydroelastic Analysis of the Mega-Float Phase-II Model
AuthorsK Kobayashi ; S Okada ; C Sato
Date published2001
AbstractIn the second phase research and development project of Mega-Float structures a 1000m-long very large pontoon type model was constructed in Tokyo Bay Japan. The on-sea experiment with this Mega-Float model (1000 x 121 x 3m) has been conducted from September 1999 through December 2000. In this paper firstly an outline of the on-sea experiment and the configuration of measurement system are described briefly. Then some examples of obtained data and analyzed results are presented.
AuthorsK Kobayashi ; S Okada ; C Sato
Date published2001
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On the application of the Time Series in structural failure detection and monitoring for offshore applications
AuthorsC S Li ; W J Ko
Date published1988
AbstractThe theory of Time Series Analysis is discussed with attention to - system observation; mathematical modelling strategy; application of the model in prediction and control; and to the specific methodologies of Auto Regressive (AR) Moving Average (MA) and combined (ARMA) models. The techniques are applied to data obtained from model experiments on a laboratory scale structure of a fixed offshore platform in normal and damaged conditions. Their application in on-line condition monitoring and failure detection in offshore platforms is described with examples.
AuthorsC S Li ; W J Ko
Date published1988
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On the propeller blade turbulisation in model test
AuthorsY S Bazilevsky
Date published2001
AbstractModel test data is analysed which estimates the influence of Reynolds number on open water hydrodynamic characteristics obtained in a deepwater towing tank. The advisability of applying trip wires on the surface of the model propeller blade to demonstrate the truth of propulsion test results is considered. Life and drag coefficient calculations are carried out to estimate CL and CD values as a function of Reynolds number and advance ratio. Results are shown and conclusions drawn. Page 6 is blank and page 7 shows a data table.
AuthorsY S Bazilevsky
Date published2001
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Passenger and crew habitability - notes on how to design for peace and harmony
AuthorsSally McMoris
Date published2001
AbstractIt is important to resolve habitability matters at the design stage. Aspects of noise and vibration control on ships based partly on experience gained within TID (Technical Investigation Department) are discussed. The factors affecting comfort which are directly controllable by naval architects marine engineers and interior designers include - noise and its effects; health and comfort; shipboard noise transmission and control; effects of vibration; and lighting.
AuthorsSally McMoris
Date published2001
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Proposal for Ocean Drilling Program Research on Gas Hydrate in the Gulf of Mexico
AuthorsW W Sager ; M C Kennicutt
Date published2000
AbstractGas hydrate traps large quantities of hydrocarbon gasses on the continental margins and have potentially important effects on sedimentary geology climate slope instability the carbon cycle and offshore oil production. The Ocean Drilling Program (ODP) has expressed interest in coring gas hydrate in a variety of environments including a mature petroleum basin. This article describes a proposal submitted to ODP for a Gulf of Mexico gas hydrate drilling cruise to address this goal.
AuthorsW W Sager ; M C Kennicutt
Date published2000
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SOLAS requirements on bulk carrier safety
AuthorsK Hui
Shelf Location213d
AbstractIn November 1997 a SOLAS Conference on bulk carrier safety was convened and introduced a new chapter XII to the 1974 SOLAS Convention. The new Chapter XII requires bulk carriers of certain size and type to meet additional safety requirements. Firstly the Amendment to the SOLAS 1974 is looked at followed by the process of making the amendments. After this future work on the safety of bulk carriers is outlined.
AuthorsDate publishedK Hui
1998
Shelf Location213d
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Spatial development on a beach plain: stop or continue?
AuthorsR Steijn ; H de Kruik ; J Holleman
Date published2005
AbstractFollowing extreme river discharges of the Rhine and the Meuse in 1995 causing serious flooding in the Netherlands the Dutch national policy on development and new investment in vulnerable areas was changed. Development of areas such as the large beach plain "Kennemerstrand" were stopped. All stakeholders including the local administration and private developers were consulted and determined to a large extent the choices that were made. The decision-making depending on the technical information but alsoshowed to have its own dynamics.
AuthorsR Steijn ; H de Kruik ; J Holleman
Date published2005
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Spatial variability of wave conditions on the French Atlantic Coast using in-situ data
AuthorsRemi Butel ; Helene Dupuis ; Philippe Bonneton
Date published2002
AbstractAn attempt is made to provide a statistical description of wave conditions on the French Atlantic coast. Attention is given to the larger scale wave variability which is needed to identify the waves climate in the area. An attempt is made to illustrate large spatial scale changes in the wave properties along the coast. Also extreme events probability which have drastic effects on the coastlines are investigated. After some introductory information a look is taken at the materials followed by the methods and the results. Lastly classification is considered.
AuthorsRemi Butel ; Helene Dupuis ; Philippe Bonneton
Date published2002
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Stabilisation
Date published1995
AbstractA series of articles on stabilisation include: The effective solution for global stabilisation (a discussion of roll reduction techniques which favours a combination of fins tanks and rudders); Unique counter-oscillating mass cuts rolling to a third (review of tests carried out by IHI in Japan on a model of a unique anti-rolling device based on a counter-oscillating mass riding on a pair of arched rails); Yard inclining tests done in less than 10min (Intering's stability test system used at Finnyards for the first time on TT-Line's ferry Robin Hood); Ride control of T-foil fast ferries (a review of Maritime Dynamic Inc's ride control systems).
Date published1995
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Statistical properties of non-linear Froude-Krylov forces on cylinders
AuthorsFelice Arena ; Francesco Fedele
Date published2001
AbstractThe statistical properties of the second-order Froude-Krylov force on a cylinder (whether a vertical cylinder or a horizontal submerged cylinder) for narrow-band spectra are investigated. For this purpose two families of stochastic processes are defined and for each family the probability density function and the probabilities of exceedance of the absolute maximum and of the absolute minimum are obtained. It is then proven that the above-mentioned Froude-Krylov force processes belong to these stochastic families. The predictions for the Froude-Krylov force on a horizontal submerged cylinder agree with the results of a small-scale field experiment.
AuthorsFelice Arena ; Francesco Fedele
Date published2001
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Structural response of pipeline free spans based on beam theory
AuthorsOlav Fyrileiv ; Kim Mork
Date published2002
AbstractOne of the main risk factors for subsea pipelines exposed on the seabed is fatigue failure of free spans due to ocean current or wave loading. This paper describes how the structural response of a free span as input to the fatigue analyses can be assessed in a simple and still accurate way by using improved beam theory formulations. The paper focuses on estimation of simplified response quantities such as lower natural frequencies and associated mode shapes.
AuthorsOlav Fyrileiv ; Kim Mork
Date published2002
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The effect of rotor blade sweep on the performance of the Wells turbine
AuthorsM Webster ; L M C Gato
PublisherInternational Society of Offshore and Polar Engineers
AbstractAn experimental investigation into the effect of rotor blade sweep on the performance of the Wells turbine is presented. The aim of the experiments was to investigate and compare the aerodynamic performance of the backward swept and unswept blades. It was shown that the swept back design of the blades had a positive value of efficiency and torque over a much wider operating range than standard unswept blades. Turbine models were also fitted with guide vanes to investigate its effect on overall turbine performance.
AuthorsDate publishedM Webster ; L M C Gato
1998
PublisherInternational Society of Offshore and Polar Engineers
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The Elastic Deformation of "Mega-Float'' and Its Effect on the GP (Glide Path) Course Structure
AuthorsH Yokoyama
Date published2001
AbstractThe "Mega-Float" is a gigantic steel floating structure for aeroplanes on the sea. This paper discusses the variation in the GP (Glide Path) course of the Mega-Float subjected to elastic deformation due to a big typhoon. The variation is predicted by analysis and numerical calculation. Also the variation produced by pouring sea water in the partitioned ballast tanks is measured by flying YS11 on the actual GP course. A flight simulator is used to evaluate the effect of an elastic deformation.
AuthorsH Yokoyama
Date published2001