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Analysis of extreme ice loads measured on USCGC polar sea
AuthorsC G Daley ; J W St John ; F Seibold et al.
Date published1984
AbstractThe ice load on the US Coast Guard vessel Polar Sea deployed in thick multilayer ice was determined as magnitude and distribution of pressure on an instrumented bow panel. Results are analysed statistically and a model of ship ice impact is developed with an analysis of total force non-dimensional peak force and with a general algorithm for ice force and pressure as functions of ship displacement stem angle and speed.
AuthorsC G Daley ; J W St John ; F Seibold et al.
Date published1984
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Bio-fuel trial on seagoing container vessel
AuthorsMaersk ; Lloyd's Register ; Shell
Shelf Location230c
AbstractThe objective of this project is testing FAME (Fatty Acid Methyl Esters) onboard the container vessel Maersk Kalmar, hence ascertaining the impact of FAME and FAME-containing marine distillate fuel in terms of storage, handling, health, safety and environment through its use in one auxiliary engine and associated systems onboard. Additionally, impacts on engine emissions, influence on lubrication oil performance, material compatibility and long term storage under maritime conditions were also measured.
AuthorsDate publishedMaersk ; Lloyd's Register ; Shell
2011
Shelf Location230c
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CFD on the BlueGene-L Supercomputer
AuthorsSuga A Sugavanam
Date published2004
AbstractThe BlueGene-L is a supercomputer. This massively parallel system exploits system-on-chip technology to deliver a target peak of 360 teraFLOPS (trillion floating-point operations per second). The main advantages of this system are price-performance and power consumption-performance. The system is mainly targeted for the discipline of life sciences - molecular dynamics computations. The suitability of this system for large problems in CFD is addressed. The system hardware is described together with the system software programming considerations characteristics of some very large problems in CFD and the examination of some specific codes on such as system.
AuthorsSuga A Sugavanam
Date published2004
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Consolidation and strength properties of calcareous sediments from Kaneohe and Kailua Bays Hawaii
AuthorsH G Brandes ; N H Khadge ; D D Nakayama
Date published2000
AbstractThe areas of Kaneohe and Kailua bays on the island of Oahu have seen continuous development over the last 40 years. Shallow-water sediments found near the shorelines were tested to determine the influence of terrigenous input on the geotechnical behaviour of marine calcareous sediments of biogenic origin. The series of 1-D consolidation and triaxial tests conducted on sediment samples from four nearshore marine environments provide useful preliminary information on the effects that volcanic terrigenous soils have on otherwise carbonate-rich reef sediments.
AuthorsH G Brandes ; N H Khadge ; D D Nakayama
Date published2000
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Copper in Cast Steel and Iron
AuthorsCopper Development Association
Shelf Location210d
AbstractThe publication deals exclusively with the influence of copper additions on the properties of cast steel and cast iron. Chapters comprise: summary of the uses of copper in cast steel and cast iron, manufacture of copper-cast steels and cast irons, metallurgical influence of copper on iron-carbon alloys, influence of copper on graphitization in iron-carbon alloys, effect of copper on mechanical properties of cast steel and cast iron, precipitation hardening and the influence of copper on the corrosion resistance of cast steels and cast irons.
AuthorsPublisherCopper Development Association
Copper Development Association
Shelf LocationDate published210d
1937
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Data fusion on the Ormen Lange shipwreck project
AuthorsMartin Ludvigsen ; Fredrik Soreide
Date published2006
AbstractAn archaeologist's primary interest is to extract as much information as possible from a sunken ship. An archaeological investigation should therefore not rely on one single method but use sensor fusion as much as possible. Various survey equipment complement each other and by combining more than one tool the archaeologist's capability for interpretation is enhanced. This paper presents the use of sensor fusion on the Ormen Lange deepwater archaeology project where a number of sensors were combined to document the site with improved precision and standards as a result.
AuthorsMartin Ludvigsen ; Fredrik Soreide
Date published2006
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Designing for wave impact on bow and deck structures
AuthorsO Hellan ; O A Hermundstad ; C T Stansberg
Date published2001
AbstractA simplified approach for design and integrity assessment for wave impact on bow and deck structures is described in this paper. The approach is based on a combination of presently available theory with the aim to end up with a practical and robust tool taking into account the most essential linear and non-linear physical effects. The main physical effects are discussed through a research case study of an FPSO operating in conditions typical of the Norwegian sector of the North Sea. Simulations are in qualitative agreement with model tests and theoretical solutions. The methodology shows promising results.
AuthorsO Hellan ; O A Hermundstad ; C T Stansberg
Date published2001
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Detection of forest fires by infrared reception in pyrophilous insects (RIN 05)
AuthorsHelmut Schmitz
Date published2005
AbstractCertain species of buprestid beetles show so-called 'pyrophilous behaviour'; i.e. they approach forest fires. In fact they depend on forest fires for their reproduction. Two genera of pyrophilous jewel beetles (Buprestidae) and one species of the genus Acanthocnemus (Acanthocnemidae) show a highly pyrophilous behaviour. For the detection of fires and for the orientation on a freshly burnt area these beetles have special sensors for smoke and IR (infrared) radiation. Whereas the olfactory receptors for smoke are located on the antennae IR receptors are situated on different places on the body of the beetles. The smoke detectors and IR receptors are discussed.
AuthorsHelmut Schmitz
Date published2005
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Determination of safe parameters of mining deposits on shelf applying hydraulic mining with holes
AuthorsYuriy N Niskovskiy ; Elena V Niskovskaya ; Anatoliy M Vasianovitch
Date published1999
AbstractA review is given of useful minerals with hydraulic mining with holes. New variational method of calcuation of parameters of working out deposits on continent and under sea-bottom on the shelf is adduced. After some introductory information methods of calculation are looked at followed by calculation and recommendation of parameters for working.
AuthorsYuriy N Niskovskiy ; Elena V Niskovskaya ; Anatoliy M Vasianovitch
Date published1999
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Development of a Numerical Ocean Basin for Predicton of Ringing Effects on Platforms
AuthorsS P Kjeldsen ; P Bonmarin
Date published2001
AbstractNumerical simulations of ringing effects on monotower platforms require a kinematic model to at least 3-order to simulate wave crest kinematics in irregular sea states and also a correct simulation of crest front steepness in large elevated waves depending on wind velocity. A large data bank containing ringing responses and extensive experiments mapping crest kinematics and crest accelerations are the basis for the development of a numerical ocean basin using a 3-order kinematic model.
AuthorsS P Kjeldsen ; P Bonmarin
Date published2001
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East Spar on stream
AuthorsJOT
Shelf LocationContact IMarEST directly for access
AbstractThe East Spar gas and condensate field which was originally discovered in 1993 by WMC off the coast of Western Australia was expected to come on stream in November 1996. A formation of the East Spar Alliance (WMC Kvaerner RJ Brown and Clough Engineering) involved the sharing of project risk as well as financial benefits. Novel features of the offshore facilities include the NCC Buoy (Navigation Communication and Control) horizontal trees subsea heat exchangers on-line pipeline corrosion monitoring system diverless umbilical tie-in systems subsea manifold and pig launcher and subsea multiphase flow meters.
AuthorsDate publishedJOT
1996
Shelf LocationContact IMarEST directly for access
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Ecosystem-based management of fishery resource management on Georges Bank (United States)
AuthorsSteven F Edwards ; Barbara P Rountree ; John B Walden et al.
Date published2001
AbstractAttention is given to the question of whether the management of fishery resources on the US Georges Bank is consistent with ecosystem-based thinking. First a look is taken at the study site and management problem. Next data and methods are outlined. After this single-species measures in fishery management plans are considered followed by ecology of fishery resources on Georges Bank technical production/other economic interactions and GIS summaries of fishing activity in groundfish closed areas.
AuthorsSteven F Edwards ; Barbara P Rountree ; John B Walden et al.
Date published2001
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Effect of axial deformation on natural frequencies of marine cables
AuthorsS Chucheepsakul ; T Huang
Date published1997
AbstractThe effect of axial deformation on the natural frequencies for the in-plane vibration of marine cables is presented. The derivation of equations of motion with some simplified numerical examples is emphasised. The model formulation developed is based on the virtual work-energy function of marine cables which involves strain energy due to axial stretching and virtual work done by hydrostatic pressure and other external forces.
AuthorsS Chucheepsakul ; T Huang
Date published1997
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Effect of constraint on fatigue crack propagation in T-Plate welded joints
AuthorsXin Wang ; Qing Gao
Date published2007
AbstractIn this paper the effect of crack tip constraint on the fatigue crack propagation of small cracks at T-plate welded joints is investigated. A fatigue crack propagation rate model is developed incorporating both low and high constraint conditions. It is shown that the effect of constraint on crack propagation rate is significant when the crack is small (within the stress concentration of the weld joints). This effect can be accounted for by using the proposed fatigue crack propagation rate model.
AuthorsXin Wang ; Qing Gao
Date published2007
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Effect of nickel on toughness of underwater wet welds
AuthorsFaustino Perez ; Stephen Liu ; Charles Smith et al.
Date published2003
AbstractThis paper presents evidence of toughness improvements on wet welds made with experimental rutile-grade electrodes. Experimental electrodes with nickel added to the flux covering (01.2 2.3 and 3.0 wt. pct.) were extruded. A commercial rutile electrode was used for comparison. Bead-on-plate and multipass V-groove wet welds were made at 1 ft. water depth in fresh water. Charpy impact test specimens were machined from the V-groove welds and tested at four temperatures.
AuthorsFaustino Perez ; Stephen Liu ; Charles Smith et al.
Date published2003
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Effects of a Strain Hardening Exponent on Inelastic Local Buckling Strength and Mechanical Properties of Line Pipes
AuthorsN Suzuki ; S Endo ; M Yoshikawa et al.
Date published2001
AbstractThis paper presents the effects of the strain hardening exponent on the inelastic buckling strength of line pipes subjected to compression and bending. Deformability of buried pipelines subjected to the lateral spreading of soil and fault movement is analyzed. Also Charpy impact tests and uniform elongation tests were conducted by test specimens to examine the effect of the strain hardening exponent on the mechanical properties of the line pipes.
AuthorsN Suzuki ; S Endo ; M Yoshikawa et al.
Date published2001
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Effects of aqueous environments on fatigue and elastic properties of rubber
AuthorsG J Lake ; T J Pond
PublisherIMarE Conferences and Symposia
AbstractA paper discussing water uptake and its effects on fatigue and elastic properties for various rubbers. Present results show little harmful effect of immersion in water on fatigue life up to a certain point. In fact under some circumstances life can be increased. The experimental procedure is outlined in the paper and some conclusions are given
AuthorsDate publishedG J Lake ; T J Pond
1987
PublisherIMarE Conferences and Symposia
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Effects of joint flexibility on the fatigue design of welded tubular lattice structures
AuthorsA Romeijn ; S A Karamanos ; J Wardenier
Date published1997
AbstractThe effects of joint flexibility on the nominal stresses in tubular lattice structures are investigated. Two simple formulae (for axial and bending stresses) based on finite element analyses are proposed. The results of this study are summarized in a simple but efficient method to calculate hot-spot stress in welded tubular structures. This method is especially important for the safe design of structures subjected to fatigue loading.
AuthorsA Romeijn ; S A Karamanos ; J Wardenier
Date published1997
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Effects of wall roughness and entry length on bubble motion in vertical rectangular tube
AuthorsT Takamasa ; K Kondoh ; H Takagi et al.
Date published1995
AbstractThe results are provided of an experimental study on the void profile and bubble figure in an air-water upward bubbly two-phase flow through rectangular tubes with short side walls of differing roughnesses. This investigation aims to examine the effect of wall roughness and entry length on the void ratio profile in a bubbly flow using the image-processing method of the back-lit images.
AuthorsT Takamasa ; K Kondoh ; H Takagi et al.
Date published1995
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Emergency disconnections on DP vessels
AuthorsE T M Fartes ; O A Figueiredo ; R J Bernado et al.
Date published1995
AbstractPetrobras have been involved in activities with dynamically positioned drilling vessels since 1984. Since then there have been 213 incidents related to emergency disconnections while several different drilling well testing completion and workover operations were in execution on the drill floor. Experience gained in this area is discussed focusing on the efforts toward ways of controlling or preventing such emergency disconnections. Degraded operating status essential DP equipment systems and remote and immediate emergency disconnection causes are considered.
AuthorsE T M Fartes ; O A Figueiredo ; R J Bernado et al.
Date published1995