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Performance analysis of pulsed loads on integrated power systems
AuthorsS D Sudhoff ; B Kuhn ; J Amy et al.
Date published2004
AbstractThis paper studies options for integrating Electro-Magnetic Rail Guns within the DD(X) Integrated Power System looks at simulation models developed to assess the impact of pulse loads on the electric plant performance and describes a reduced power test bed which can be used to validate simulation model approaches. Two basic configurations of pulse power converters are considered - a load commutated based converter reflecting various power factors on the electric plant and a combined uncontrolled rectifier-dc/dc converter based charger reflecting near-unity power factor on the electric plant. Each option is examined with and without the option of coordinating operation with the propulsion system. Also potential impacts to plant line-ups and ship-service power are discussed.
AuthorsS D Sudhoff ; B Kuhn ; J Amy et al.
Date published2004
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Prediction on aging of reconstitutive clayey marine soils using fuzzy-logic
AuthorsJorge Sanchez Moreno ; Edison Castro Prates de Lima ; Gilberto Bruno Ellwanger
Date published2003
AbstractThe main objective of this paper is to present an application of fuzzy logic theory to predict the depth variation of the soil strength by aging effect. The results of experimental tests with reconstituted clayey soils of the Bay of Campeche were used to generate the fuzzy rule-based system. The artificial soil was made with a suspension adding marine water and was left in free sedimentation and consolidation processes. After this triaxial testing type Consolidated-Undrained (CU) was carried out on samples so the measurement of the shear strength could be made through the time. The fuzzy logic model is based on a decision (inference) process that can be better described on a linguistic level using rules with soft facts.
AuthorsJorge Sanchez Moreno ; Edison Castro Prates de Lima ; Gilberto Bruno Ellwanger
Date published2003
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Report of the investigation into the lifeboat accident on Pride of Hampshire on 25 September 1994
AuthorsMarine Accident Investigation Branch (MAIB)
Shelf Location15d
AbstractThe ro-ro passenger ferry Pride of Hampshire was berthed at Cherbourg when No 2 lifeboat launching equipment failed whilst the crew were undergoing lifeboat drill. 16 of the 32 occupants were taken to hospital. Examination of the damaged davit structure found that welded joints were of inferior quality with incomplete penetration and lack of fusion. This report includes the sections Factual Account (particulars of the vessel and crew and a narrative); Considerations of Possible Factors (including extent of damage to no. 2 lifeboat launching installation, metallurgical examination of the suspension links and pivot pin boss weld joints, Marine Safety Agency requirements for lifeboat launching equipment blocks and attachments, quality assurance) and Conclusions (findings and recommendations).
AuthorsPublisherMarine Accident Investigation Branch (MAIB)
London : Her Majesty's Stationery Office (HMSO), 1996.
ISBN number115518711
Shelf LocationDate published15d
1996
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Requirements made on integrated transport systems - APL takes on the future: integrating the Pier 300 Terminal in Los Angeles
AuthorsJ Truchan
Date published1996
AbstractThe establishment of carrier alliances with dedicated facilities as a means of reducing costs maximising assets and providing an efficient reliable and cost effective service to customers is discussed. Pier 300 the new Los Angeles multi-carrier terminal under construction for American President Lines and designed to meet the needs of the Global Alliance of container carrying companies is described with details of the equipment and operating systems associated with key items of work flow including Gate Yard Cargo Handling Machinery Vessel/Rail/Truck and Customer: potential for further automation is also considered. The establishment of carrier alliances as a means of reducing costs maximising assets and providing an efficient reliable and cost effective service is discussed.
AuthorsJ Truchan
Date published1996
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Research on Applicability of New Materials to Marine Structures in Tropical Climates - Exposure of Structural Materials at Okinotori-Shima
AuthorsF Tomosawa ; S Tsujikawa ; T Nakatsuji et al.
Date published2001
AbstractThis study aims to investigate the applicability of newly developed lightweight structural materials having high durability to marine structures from the standpoint of their lifecycle cost focusing on the corrosion resistance of such materials. The material selection specimen fabrication and initial performance testing of specimens have been completed so far and exposure tests are being carried out at Okinotori-shima Miyako-jima and in a laboratory in Tokyo. This paper reports on the outline of the exposure tests and the results of tension tests on metallic materials.
AuthorsF Tomosawa ; S Tsujikawa ; T Nakatsuji et al.
Date published2001
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Seafloor geodesy and an ocean-bottom cable system
AuthorsHiromi Fujimoto
Date published2003
AbstractSpace geodetic technologies such as GOS VLBI (very long baseline interferometry) SLR (satellite laser ranging) and SAR (synthetic aperture radar) have revolutionised geodesy on land. However these technologies based on electric waves cannot be directly applied to seafloor geodesy because electric waves inclusive of light can hardly propagate the seawater. Sound waves and ocean-bottom cables have to be adopted for underwater communication positioning power supply and data recovery. The importance of crustal movement on the seafloor has long been known and how there are promising reports on GPS or acoustic seafloor positioning repeated acoustic ranging on the seafloor ocean-bottom pressure monitoring and tilt measurements in deep-sea boreholes. Long-term continuous and regional observation is crucial for geodetic monitoring of geodynamics. Now is the time for a new plan of scientific ocean-bottom cable system to be examined. Although global coverage is difficult trans-ocean monitoring systems or regional systems over seismogenic zones are feasible. The latter can maintain real-time observations on the seafloor which are crucial for studying how a big earthquake is prepared.
AuthorsHiromi Fujimoto
Date published2003
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Structureborne noise control on cruise ships
AuthorsG Besio ; V Loredan
PublisherIMarE Conferences and Symposia
AbstractTaking diesel-electric cruise ships as a reference this paper illustrates the procedure followed by Diesel Ricerche SpA to limit the structure borne noise problem on the hull foundation where target values are quite strict. Each ship is powered by five gensets three of which are engined with GMT-Sulzer 8ZAL40S and the other two with 12ZAV40S. In each set the engine and the electric machine are rigidly mounted on a common raft and each is connected through an elastic coupling. The raft is resiliently mounted on two rows of sandwich type inclined mounts. As a result of a preliminary acoustic estimation of the ship the noise level was high at middle-range frequencies and methods of noise reduction for the system are examined.
AuthorsDate publishedG Besio ; V Loredan
1993
PublisherIMarE Conferences and Symposia
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Study of wave load nonlinearity effect on fatigue life in component stochastic fatigue analysis
AuthorsSungkon Han ; Kyung-Won Park ; Hyun-Il Shin
Date published2004
AbstractThis paper addresses details of wave load nonlinearity effect on stress RAO and damage ratio using component stochastic fatigue analysis. Traditional spectral fatigue analysis for ship structure is based on linear theory; however there are a number of nonlinearity sources. Especially loading nonlinearity such as hydrodynamic pressure applying to ship side and gravity changes due to roll and pitch motion is thought to critically violate the linearity assumption of spectral fatigue analysis which involves stree RAO as linear parameter. The main focus is placed on how to idealize complicated characteristics of loading nonlinearity and how to implement the nonlinear bias to linear spectral fatigue analysis.
AuthorsSungkon Han ; Kyung-Won Park ; Hyun-Il Shin
Date published2004
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Study on optimisation of automatic control parameters for Ekranoplan WIG ship
AuthorsQian Zhou ; Xing-fa Xu ; Chang-hua Yuan
Date published2006
AbstractA method is introduced that is based on the space motion equation of Ekranoplan for optimising automatic control parameters. Firstly the space motion equation of Ekranoplan plus Automatic Control System is established. Next MATLAB is chosen as the main software support for establishing the mathematical model of optimisation system with the help of its non-linear multi-variable function fmincon 0. Finally the optimum procedure of automatic control parameters is programmed on the platform MATLAB-GUIDE and the optimisation calculation of automatic control parameters can be carried out. The results show that through optimisation calculation of automatic control parameters of ekranoplan optimal results may be achieved and for solving the questions of dynamic stability and manoeuvrability of Ekranoplan it is unnecessary purely to depend purely on the aerodynamic design.
AuthorsQian Zhou ; Xing-fa Xu ; Chang-hua Yuan
Date published2006
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Tagging juvenile seabass and sole with telemetry transmitters: medium-term effects on growth
AuthorsM L Begout Anras ; D Coves ; G Dutto et al.
Date published2003
AbstractThe effects of tagging with acoustic transmitters on the growth of juvenile seabass in a 47 d tank experiment and sole in a 72 d tank experiment and in a 58 d salt marsh mesocosm experiment were examined. Twenty externally tagged seabass grew more slowly than the 20 with surgically implanted tags which reached the same mass as nine control fish. Movements of the external transmitter's harness caused abrasions of the skin and loss of the tag in 60% of cases. The external tag also induces extra drag forces for which the fish must compensate. The experiments concluded that for juvenile sole the externally attached tag retention rate was good but at the expense of fish growth rate. This paper presents experiments on the medium-term effects of tagging on growth of juvenile seabass and juvenile sole.
AuthorsM L Begout Anras ; D Coves ; G Dutto et al.
Date published2003
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The development of an ISO standard for specifications and performance tests of on-line monitors/sensors for water quality
AuthorsA Lynggaard-Jensen
PublisherNational Engineering Laboratory
AbstractResults of work carried out in a European research project and in a working group under ISO (International Standardisation Organisation) are presented; a draft of a technology independent standard for testing the performance characteristics of on-line monitors/sensors for water quality parameters is described. The standard can be considered as a horizontal standard covering the measurement of any water quality parameter. Using the definitions of the performance characteristics will enable users and producers of on-line monitors/sensors to define a vertical standard for a certain parameter even in a given application. The standard can also be used in certification schemes and in running supervision of the operation of on-line monitors/sensors.
AuthorsDate publishedA Lynggaard-Jensen
2001
PublisherNational Engineering Laboratory
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The effect of a foul release coating on propeller performance
AuthorsM Atlar ; E J Glover ; M Candries et al.
Date published2002
AbstractThe effect of the propeller's surface condition is often overlooked when examining the reduction in ship performance associated with the condition of the ship's hull. Nevertheless the result can be significant. While the most common cause of propeller deterioration is corrosion fouling is significant. A study into the possible benefits of the use of foul release systems on propellers is presented. These benefits include increased propulsive efficiency and fuel savings lower maintenance costs and a cleaner environment. A literature review was carried out looking at the effect of propeller surface conditions on ship performance and at propeller coatings for merchant ships. Next theoretical calculations on the possible gains are explored for a merchant ship propeller type using a propeller lifting surface analysis programme. These showed that the significant losses in efficiency caused by blade roughening can be avoided by cleaning and polishing the blades or by the application of a foul release coating with a surface finish equivalent to a new or well-polished propeller. Research is ongoing and the calculations had still to be validated with model tests.
AuthorsM Atlar ; E J Glover ; M Candries et al.
Date published2002
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The Effect of Attachment Plate Thickness on Fatigue Crack Shape Development in Welded T-Plate Joints
AuthorsR Yee ; Y Huang ; S B Lambert et al.
Date published1998
AbstractThe effect of attachment thickness on the fatigue behaviour of T-plate welded joints subjected to constant amplitude three-point bending has been examined using both experiments and numerical simulations. In the experiments fatigue crack initiation propagation and coalescence was monitored using DC potential drop techniques in combination with ink stains and beach marks. This detailed crack shape development data has permitted the development and verification of a probabilistic fracture mechanics model for the initiation growth and coalescence of fatigue cracks in welded joints using a Monte Carlo technique. In this paper these experiments are used along with detailed simulation results to explore the effect of attachment plate thickness on fatigue in welded T-plate joints. The important role of crack shape development on these simulations is discussed.
AuthorsR Yee ; Y Huang ; S B Lambert et al.
Date published1998
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Study on ship form technical and economic evaluation DS based on interactive MCDM
AuthorsSong Sang ; Hua-Jun Li
Date published2005
AbstractShip-integrated design which includes the selection of a ship's particular dimensions design of ship form general arrangement and structure optimisation and so on is the pre-requisite (and a most important process) to the design. It affects the ship's ultimate technical and economic performance. The optimal selection of ship types is a complicated multi-variable and multi-objective issue and its solution relies mainly on designers' experience in the past. In recent years progress has been made in the research of ship particular dimensions and demonstration optimisation and ship type by setting up the math model adopting optimisation methods in mathematics system science and MCDM with the development of science and computer technique. A new method of interactive MCDM (multiple criteria decision making) is presented. In cases where ship designers sometimes find it difficult to make a decision when facing such complex ship form schemes. To address this the conventional AHP (analytical hierarchy process) is adopted but this mostly depends on the designer's subjective and leads to the systematic error. A new method can obtain accurate results with the rigid least square method as a tool making full use of the AHP and the objective information entropy which reflects the inherent attribute. When applied in practice it is proved to be effective
AuthorsSong Sang ; Hua-Jun Li
Date published2005
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Use of on-line sensor technology for oil and machinery condition monitoring - case studies on real world applications and their use to predict machinery failure and extend oil change intervals Paper no. 150
AuthorsIain Lamont
Shelf Location224a
AbstractCIMAC Congress 2007 - Vienna Ever increasing demands to cut costs and manpower means an inevitable reduction in time-consuming laboratory based oil analysis. An alternative is therefore required. A range of on-line CMS (condition monitoring sensors) have been designed tested and placed in real world situations. These sensors detect parameters such as metallic wear debris emulsified and dissolved water viscosity and oil condition. These sensors provide the possibility of real time measurement of wear metals and oil condition at an economical cost. It is shown how this can be achieved in a number of cases including real and simulated failures. On-line sensor technology is presented for use in monitoring oil and machinery condition. Oil and machinery condition data has been collected from slow- and medium- speed diesel engines industrial and wind turbine gearboxes. This shows how oil change intervals can be extended and maintenance can be scheduled in advance. It is shown how well the sensors have performed and that real time assessments of machinery condition can be made from the data. The sensor development project described has now been completed and has resulted in full commercialisation of a suite of on-line oil conditions sensors.
AuthorsDate publishedIain Lamont
2007
Shelf Location224a
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A Fire Brigaders role in the fighting on board ships
AuthorsD Wynne
PublisherIMarE Conferences and Symposia
AbstractThe role of the UK local Authority Fire Brigade in fighting shipboard fires discussed with reference to the legal position data on incidents during 1980s special problems on ship fires operational procedures and specific duties
AuthorsDate publishedD Wynne
1980
PublisherIMarE Conferences and Symposia
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A study on safety evaluation method for automatic navigation system
AuthorsT Fuwa
Date published1990
AbstractA proposal on the method of official safety assessment for an automatic ship navigation system is made. It consists of four stages which are examination of the design by means of documents and charts inspection synthetic computer simulation full scale experiment and on-the-job assessment in practice. The philosophy for the determination of the official safety criteria is stated.
AuthorsT Fuwa
Date published1990
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EEC funds research on low-cost ship
AuthorsMER
Date published1983
AbstractA recent EEC report examines the effect of world recession and the oil crisis on European trade shipping and shipbuilding. It has prompted the EEC to fund research into developing more economical methods of ship building and operation with the emphasis placed on hull designs buoyancy propeller design less usual fuels microprocessor control and crew effectiveness. The UK research effort will be coordinated by the Institute of Marine Engineers.
AuthorsMER
Date published1983
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Environmental forces on offshore structures - statement of research requirements
AuthorsSUTGEF
Date published1989
AbstractLong term research requirements in the field of environmental forces on offshore structures have been identified and listed by The Society of Underwater Technology's Group on Environmental Forces - their findings are discussed in the key areas of environmental data and environmental loading and projects of prime importance are outlined which stress the need to develop reliability analysis techniques.
AuthorsSUTGEF
Date published1989
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Explosion from the auxiliary boiler of the MV Manapouri ON 335896 - Report of Preliminary Enquiry No 3472
AuthorsDepartment of Trade
Shelf Location15c
AbstractReport on the explosion of the boilers of the Motor Vessel Manapouri, whilst the ship was alongside Queens Dock in Cardiff on the 24 May 1974.
AuthorsPublisherDepartment of Trade
HMSO
Shelf LocationDate published15c
1975