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Report on Tests Concerning Fires in Ships' Corridors
Shelf Location227b
PublisherDenmark, 1958
AbstractThis is the Summary of the Report on Tests Concerning Fires in Ships' Corridors The report describes and considers the fairly searching investigations caused to be undertaken by the Directorate of the Government Ships Inspection Service and the State Testing Laboratory – in particular by the Committee appointed by the Directorate – assisted by the Association of Shipyards, the Shipowners’ Association and the Fire Protection Committee for the purpose of examining the influence that exposed surfaces may have on the development of fire in ships. Contents include: Summary of development since 1952; Report on Full Scale Tests; Report on Laboratory Tests; Analysis of full scale test results; Analysis of Laboratory Tests Results and comparison with Full Scale test results; Final Remarks. Accompanying the Summary, there is the Report itself and the Appendices.
Shelf LocationDate published227b
1958
PublisherDenmark, 1958
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Scalar image processing filters for speckle reduction on synthetic aperture sonar images
AuthorsJocelyn Chanussot ; Frederic Maussang ; Alain Hetet
Date published2002
AbstractHigh-resolution images provided by SAS (synthetic aperture sonar sensors) are of great interest especially for the detection location and classification of mines lying on the seabed. However these data obtained by an active imagery system are highly corrupted by a noise called the speckle. To reduce this noise and to suppress the spurious reflections it generates on the images it is proposed to use different algorithms based on image processing techniques. Several image-processing filters are tested and discussed. A comparative study of the results obtained on real SAS data is presented. The different filters are evaluated both visually and in terms of variance reduction. Conclusions are drawn.
AuthorsJocelyn Chanussot ; Frederic Maussang ; Alain Hetet
Date published2002
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Study on Maritime Broadband Communication System at the Tokyo University of Marine Science and Technology
AuthorsKohei Ohtsu ; Ruri Shoji ; Hiroyuki Oda et al.
Date published2005
AbstractBroadband has been available for some years now. High-speed Internet access has been available to air passengers since May 2004. However at sea communication is still limited to a transmission rate of 64 Kbps at most. In 2002 a project was started to achieve high-speed large-scale two-way communication between ship and shore and between ship and ship. This project was called MBB (Marine Broadband) communication project. The construction of its infrastructure and applications was developed. A satellite automatic tracking antenna system was installed in order to realise the broadband communication between ship and shore on Shioji Maru a university training ship and on Ginga Maru a newly built training ship. The transmission rate of up-link achieved 1 Mbps and this was enough to transmit motion-image information. Experiments were conducted on transmitting the image. Based on these results a new system for ship operation and support system using the MBB at first is proposed.
AuthorsKohei Ohtsu ; Ruri Shoji ; Hiroyuki Oda et al.
Date published2005
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The effect of path prediction on navigational performance during deep channel navigation
AuthorsL van Breda ; P O Passenier ; P A Wilson
PublisherComputational Mechanics Publications
AbstractSix channel pilots participated in an experiment to work out the potential benefits of path prediction on the navigation performance with channel-bound vessels. The pilots sailed an approach channel by a deep draught vessel under critical conditions. A basic ARPA radar system was used for navigation supplemented by three kinds of path predictors. Predictor (a) was based on an accurate fast-time hydrodynamic model of the vessel showing the vessel's exact path. Predictor (b) was based on a non-linear speed and rate of turn extrapolator. Predictor (c) was based on a linear speed and course extrapolator. The method is described and the results are discussed.
AuthorsDate publishedL van Breda ; P O Passenier ; P A Wilson
1997
PublisherComputational Mechanics Publications
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A theoretical study on the effect of seaquakes on a three- dimensional floating body
AuthorsY Higo
PublisherInternational Society of Offshore and Polar Engineers
AbstractSeaquake forces acting on a three-dimensional floating body have been studied numerically. The green function which satisfies the Helmholtz equation and fulfils the free surface condition and the sea bottom boundary condition was introduced. The solutions of the seismic wave field and pressure distribution were obtained by making use of the boundary integral equation method. The seaquake forces were also obtained numerically.
AuthorsDate publishedY Higo
1998
PublisherInternational Society of Offshore and Polar Engineers
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Cost Effect of Ice Loads on Offshore Wind Generator Foundation
AuthorsM Maattanen
Date published2001
AbstractIn this paper a review on ice load scenarios and ice loads on a typical Northern Baltic offshore wind generator foundation are presented. The chosen ice conditions present a severe combination of level ice rafted ice and first year pressure ridge loads. A cost comparison is made on ice load effects on caisson and single pile foundations. Different water depth and ice load scenarios are compared to find out the cost effect and the potential of different foundation types.
AuthorsM Maattanen
Date published2001
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Ducted versus conventional propellers; a comparison based on economy
AuthorsL Sinclair ; O H Slaattelid
Date published1976
AbstractFull scale experience and model test data with computer analysis and prediction techniques are used to compare economic aspects and costs of ducted (fixed duct) and conventional propellers. These are specifically related to a system fitted on a bulk carrier and generally related to speed/power capital outlay on duct propeller and air injection equipment repair maintenance and operating costs with worked examples on the effect of ducts on tanker and OBO performance.
AuthorsL Sinclair ; O H Slaattelid
Date published1976
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Experimental investigation of the shipping of water on the bow of a containership
AuthorsNuno Fonseca ; Carlos Guedes Soares
Date published2003
AbstractThe paper presents the results of an experimental investigation of the shipping of water on the bow of a containership. Model tests were carried out in head regular and irregular waves of large amplitude. Measurements were taken of the absolute and relative motions the structural loads the height of water and the impact pressure on the deck and the horizontal impact pressure and total force on the first line of containers on the bow.
AuthorsNuno Fonseca ; Carlos Guedes Soares
Date published2003
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Feasibility of using free-fall lifeboats on passenger ships
AuthorsJ K Nelson ; R L Markle
PublisherInstitute of Marine Engineers
AbstractThe feasibility of using free-fall lifeboats on passenger ships is evaluated with discussion of: development of the concept from first patent to current implementation on cargo ships mobile drilling rigs and offshore structures; SOLAS carriage requirements for passenger ships placement implications and cost differential (comparison is made with conventional davit launched equipment); the need for crew and passenger training in the use of free-fall restraint systems; and the recent findings of an IMO panel of experts on RORO safety. Concluding remarks consider free-fall lifeboats to be inappropriate for general use on passenger ships but concede some specialist applications.
AuthorsDate publishedJ K Nelson ; R L Markle
1995
PublisherInstitute of Marine Engineers
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On ship manoeuvrability estimation based on IMO resolution No.A.751(18)
AuthorsE Nikolaev ; T Inutina ; M Lebedeva et al.
Shelf Location213c
AbstractThe ship dynamic stability criteria in the IMO Interim Standards for Ship Manoeuvrability - IMO Assembly resolution A.751(18) - are looked at. Course-keeping ability estimation for several ships is compared based on calculating both zig-zag and spiral manoeuvres. The spiral test gives a direct estimation of ship straight-line stability whereas the zig-zag test may give only an indirect assessment of this quality. The examples provided show the importance of including spiral tests in the procedure of ship manoevrability estimation.
AuthorsDate publishedE Nikolaev ; T Inutina ; M Lebedeva et al.
1996
Shelf Location213c
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On the modelling of foundations for jack-up units on sand
AuthorsM J Cassidy ; G T Houlsby
Date published1999
AbstractAn elasto-plastic model - Model C - appropriate for the modelling of foundations for jack-up units on sand is detailed. In addition the benefits of its application as the foundation model for a plane frame analysis programme (JAKUP) are demonstrated. The main characteristics of the structural foundation and wave loading models are looked at and example calculations are given. Lastly there is discussion of the applications of these models.
AuthorsM J Cassidy ; G T Houlsby
Date published1999
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Prediction method for hydrodynamic forces acting on a ship hull
AuthorsK Kijima ; Y Furukawa ; K Yukawa
Shelf Location213d
AbstractA prediction method for the hydrodynamic forces acting on a ship hull theoretically based on slender body theory is presented. This method needs only one parameter denoted by s which represents the initial position of vortex filaments shed from separation points on the ship hull. The results of numerical calculations show the prediction method to give good agreement between predicted and measured hydrodynamic forces acting on a ship hull.
AuthorsDate publishedK Kijima ; Y Furukawa ; K Yukawa
1998
Shelf Location213d
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The effects of scour on the design of offshore wind turbines
AuthorsJ van der Tempel ; M B Zaaijer ; H Subroto
Date published2004
AbstractThe effect of scour on the design of offshore wind turbines is explored. First some background information on scour is given covering development of scour types of scour effects of scour on offshore wind turbines and preventing scour. Next a look is taken at calculating scour including scour depth determination time scale of scour application of scour calculations in a random marine climate and standards/measurements. This is followed by consideration of effects of scour on the design of offshore wind turbines addressing pile designs natural frequency and fatigue.
AuthorsJ van der Tempel ; M B Zaaijer ; H Subroto
Date published2004
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The local effects of hull roughness on skin friction. Calculations based on floating element data and three dimensional boundary layer theory
AuthorsL E Johansson
Date published1985
AbstractA mathematical study correlates ship hull roughness with boundary layer flow and viscous resistance and leads to the development of an experimental technique for evaluating roughness effects by direct measurement of skin friction and velocity profile. Calculations are presented for a tanker a container ship and a flat plate. Results on resistance for various degrees of roughness are presented local effects are also studied. Economics of hull surface treatment are discussed.
AuthorsL E Johansson
Date published1985
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Report on Select Committee on Marine Insurance 1840 evidence given by John Julius Angerstein
AuthorsHMSO
Shelf LocationAP
AuthorsCatalogue numberHMSO
unk
Shelf LocationAP
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A study on characteristics of negative skin friction on model pile
AuthorsKyu Hwan Lee ; Min Bo Shim ; Song Lee et al.
Date published1999
AbstractA description is given of the measurement of negative skin friction forces on the model piles driven in the cylindrical chamber filled with remolded marine clay. After some introductory information a look is taken at the test apparatus. Next test preparation and procedures are outlined. This is followed by consideration of the test results and pullout test results.
AuthorsKyu Hwan Lee ; Min Bo Shim ; Song Lee et al.
Date published1999
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A study on the effect of seaquakes on a floating body
AuthorsE Baba
Date published1988
AbstractEffect of seaquakes on a floating body in an open sea and in an enclosed basin was studied theoretically and experimentally. First sea bottom and breakwaters were replaced by the distributions of highly pulsating bubbles and then formulas for surge sway and heave accelerations of the floating body were derived in term of the acceleration of sea bottom or breakwaters. The theoretically predicted responses of the floating body were well supported by laboratory experiments.
AuthorsE Baba
Date published1988
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An Interpretation of the IMO Guidelines on the Application of Plastic Pipes on Ships: Lloyd's Register Technical Association 1993-94 Paper 7 1-22
AuthorsD J Cox
Shelf LocationINTERNAL
AbstractThe purpose of this paper is to assist Surveyors in the interpretation and implementation of the IMO Guidelines with respect to LR's work. The use of plastic pipes in shore based installations is well established but the application to ships has been limited by safety aspects. These guidelines have opened the door to wider use of plastic pipes on ships.
AuthorsPublisherD J Cox
LRTA
Shelf LocationDate publishedINTERNAL
1993
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Application of ZrO2-type NOx sensor for on-board measurements of engine emissions
AuthorsNobutaka Kihara ; Takeshi Kusaka
Date published2004
AbstractAn OBS (on-board measurement system) is presented that tests automotive emissions. The OBS uses a ZrO2 type NOx-O2 sensor as one of its main components. Test results of this system obtained from on-road measurements using a diesel vehicle are described as well as the configuration of the system. In addition the possibility and effectiveness of the ZrO2-type sensor for marine application is discussed based on continuous monitoring results on actual ships.
AuthorsNobutaka Kihara ; Takeshi Kusaka
Date published2004
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Danish Maritime Authority Report on the impact of high-speed ferries on the external environment
AuthorsDanish Maritime Authority
Shelf Location226b
AbstractThe work of a committee set up by the Danish Maritime Authority to investigate the effects of high speed craft on the marine environment are presented. Working groups covered the areas of noise, air pollution, waves and speed and propulsion systems.
AuthorsPublisherDanish Maritime Authority
Danish Maritime Authority
Shelf LocationDate published226b
1997