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22981 results Most recent
  • Wind forces on modern ship forms effect on performance

    Authors

    W B Van Berlekom

    Date published

    1980

    Abstract

    A systematic series of wind tunnel tests examine direct wind forces and moments on ships of different above-water structures particularly size and position of deckhouse (tanker containership RORO small craft) and induced forces and moments on underwater hull. Results include - wind coefficient curves added resistance due to drift and rudder angles effect of added resistance on propeller efficiency wind effects on manoeuvring.

    Authors

    W B Van Berlekom

    Date published

    1980

  • BSRA Technical Memorandum No. 125 Reports on foreign observers' course on the nuclear ship 'Savannah'. Report on Visits

    Authors

    J A Dodd ; S Macdonald

    Shelf Location

    in storage

    Authors

    J A Dodd ; S Macdonald

    Publisher

    British Ship Research Association

    Shelf Location

    in storage

    Date published

    1960

  • Marine Accident Investigation Branch Report No 37/2000 Report on the Investigation of a Rupture of the Port Economiser on board Island Princess resulting in two deaths on 7 December 1997

    Authors

    MAIB

    Publisher

    DETR

    Authors

    MAIB

    Date published

    2000

    Publisher

    DETR

  • Report on the investigation of the grounding of the class VI passenger vessel Pride of the Dart on Mew Stone rocks near the entrance to the River Dart on 28 June 2002

    Authors

    Marine Accident Investigation Branch

    Shelf Location

    40d

    Authors

    Marine Accident Investigation Branch

    Catalogue number

    UNK

    Shelf Location

    40d

  • Experimental study on vertical ice loads acting on multi- leg structures

    Authors

    T Terashima

    Date published

    2000

    Abstract

    If an ice sheet adfreezes to a structure with a circular cross-section such as the pile of a pier or a mooring pile set in the water of a cold region vertical ice loads act on the structure and can cause the uprooting of a pile if there is fluctuation in the water level due to the tide or other factors. Therefore vertical ice loads must be considered when designing structures that will be subjected to ice loads. The vertical ice load acting on a single pile structure can be estimated using the theoretical calculation method proposed by the authors. In this study field experiments are carried out for the first time on ice loads acting on multi-leg structures to try to establish a theoretical method for calculating ice loads acting on such structures.

    Authors

    T Terashima

    Date published

    2000

  • On the effect of water on deck on ship motion

    Authors

    Dimitris Spanos ; Apostolos Papanikolaou ; George Tzabiras

    Date published

    2002

    Abstract

    The effect of trapped water on deck or the interior compartments of ships on ship motions is closely investigated by use of a non-linear numerical simulation method. The employed method enables the efficient simulation of the wave excited coupled ship - trapped water motions and proves to be a very valuable tool for the assessment of the survivability of flooded ships in waves. A detailed study has been carried out to more carefully investigate the coupling effects between the ship and the floodwater mass that can be expressed through a resultant interaction force. This interaction force has been approximated both by a simplified model employed by the present simulation method and also by a more accurate CFD code and satisfactory agreement between the results of both approaches has been obtained.

    Authors

    Dimitris Spanos ; Apostolos Papanikolaou ; George Tzabiras

    Date published

    2002

  • On the reliability and risk analysis of subsea blowouts preventers with focused attention on DP rigs

    Authors

    Nilo de Moura Jorge

    Date published

    2005

    Abstract

    This paper provides a selection of findings on the reliability and risk analysis of submarine blowout preventers (BOPs) achieved in recent studies in which the author has participated among technicians in Petrobras and Rio de Janeiro Federal University - UFRJ. Special attention is given to the deepwater and ultra deepwater scenarios. The riser safety margin tends to be unavailable as the water depth becomes deeper and so in an emergency disconnection the safety isolation of the well tends to be relied on the BOP mechanical barriers only. In this context risks on different configurations of the BOP are compared and their results discussed with focused attention on main factors of risk. Finally there has been visible progress on BOP reliability within recent years and a number of good operational practices in place are also mentioned in the paper.

    Authors

    Nilo de Moura Jorge

    Date published

    2005

  • Uncertainties in the estimation of fluid loading on offshore structures with special emphasis on wind forces

    Authors

    S Singh

    Date published

    1989

    Abstract

    Some of the major uncertainties in the estimation of mean drag forces on offshore structures especially those generated by wind are presented and discussed. Standard techniques as suggested by published criteria and guidelines are used to illustrate some of these uncertainties for three cases. These are loads on the legs of a jack-up unit loads on a group of conductors and finally wind forces on a semi-submersible unit. Potential problems in the use of wind tunnel modelling are also discussed and recommendations made for a unified and consistent approach to estimating mean drag forces on offshore structures.

    Authors

    S Singh

    Date published

    1989

  • Study on synthesis optimisation of speed and sea keeping performance based on on-line simulation of high-speed single-hull ship

    Authors

    Yi Wang ; Sing-lin Yang

    Date published

    2006

    Abstract

    The main elements of the navigation performance of a ship are its speed its manoeuvrability and its seakeeping. The mathematical model of a high-speed single hull ship's propulsion system (adjustable-pitch screw propulsion) is firstly established. Then based on MATLAB the simulation model of the propulsion system is built with the help of simulation software 'Simulink'. The intelligent control on the propulsion system is carried out using fuzzy controller of Look-Up Table. After that the mathematical model of synthesis optimisation of high-speed single-hull ship is established by considering control speed and seakeeping performances. Based on the aforementioned established simulation model and applying GAOT MATLAB's optimisation toolbox for GA (Genetic algorithm) the optimisation design of the system is carried out. An example is given and the accuracy and reliability of the simulation and optimisation models are validated.

    Authors

    Yi Wang ; Sing-lin Yang

    Date published

    2006

  • A finite-element model for in-situ behaviour of offshore pipelines on uneven seabed and its application to on-bottom stability

    Authors

    B A Ose ; R Nystrom ; A Damsleth et al.

    Date published

    1999

    Abstract

    A Finite Element (FE) model for simulation of the in-situ behaviour of offshore pipelines laid on a 3-D seabed with focus on on-bottom stability is presented. 3-D FE simulations are provided as design examples. After some introductory information a look is taken at the area of application and model details. Next validation of the FE model is addressed followed by acceptance criteria and design examples.

    Authors

    B A Ose ; R Nystrom ; A Damsleth et al.

    Date published

    1999

  • Discussion on high-speed boat run-up on rocks and its impact force

    Authors

    Guoyu Chen

    Date published

    2006

    Abstract

    'Boat run up on rocks' means boat and rock collision. This also refers to boat collision with things fixed under the water such as piers. There is much interest and there has been much research in this area. A formula on the calculation of the impact of force of 'boat run up on the rocks' is presented. The formula includes parameters such as angle speed rigidity and qualities of the 'impact pair' and may provide help with the designing of bows for high-speed boats.

    Authors

    Guoyu Chen

    Date published

    2006

  • Observations on the Effects of Lightning on Floating Bodies with an account of a new method of applying fixed and continuos conductors of electricity to the masts of ships in a letter addressed to Vice-Admiral Sir Thomas Byam Martin. Harris on Lightning

    Authors

    William Snow Harris

    Shelf Location

    RR11

    Authors

    William Snow Harris

    Shelf Location

    RR11

  • Biofilm Effects on Drag - Measurements on Ships

    Authors

    G S Bohlander

    Publisher

    IMarE Conferences and Symposia

    Abstract

    This paper describes the results of two full-scale power trials on a US Navy frigate to determine the effect of biofilms on ship power and fuel consumption. A significant change in power consumption ranging from 8-18% was measured by trials before and after underwater cleaning.

    Authors

    G S Bohlander

    Date published

    1991

    Publisher

    IMarE Conferences and Symposia

  • Guidelines on the impact of aggregate extraction on European marine sites

    Authors

    Posford Duvivier Environment

    Date published

    2003

    Abstract

    The EC Habitats Directive aims to promote the conservation of habitats and species within the European Union by designating sites known as SACs (special areas of conservation). The UK Marine SACs Project aims to promote the implementation of the Habitats Directive in marine areas through trialling the establishment of management schemes on 12 sites in the UK and by providing proven good practice and guidance to practitioners in the UK and Europe. To support the establishment of these management schemes the Project is undertaking a series of tasks to collate and develop the understanding and knowledge needed. One of the areas for providing guidance to those developing the schemes concerns the interaction between human activities and marine features. Human activities have an important role in the management of marine features and may have both beneficial and damaging impacts. This report has been prepared to provide information and guidance on aggregate extraction activities. There are a number of objectives for the series of guidance documents forming part of the UK Marine SACs Project. The overall aim of this task is to provide information on the potential impacts of aggregate extraction on marine and coastal habitats and species listed in Annexes 1 and 2 of the Habitats Directive and to provide guidance on the assessment of potential impacts. Among the habitats and species specified in Annexes 1 and 2 several are marine features and SACs have already been selected for many of these in the UK. One initiative now underway to help implement the Habitats Directive is the88712 Guidelines on the use of high-modulus synthetic fibre ropes as mooring lines on large tankers OCIMF

    Authors

    Posford Duvivier Environment

    Date published

    2003

  • Tenth International Towing Tank Conference Volume 2

    Authors

    Nat Phys Lab

    Shelf Location

    213c

    Abstract

    Tenth Int Conf held in Teddington in Sept 1963 Papers are The resistance tests on the ITTC Standard Model Results of resistance tests of standard model Resistance tests of standard model Resistance tests of standard laminated fibre glass model An analysis of some Mitsubishi standard model tests Further model tests with a 760 tdw motor coaster A study of the turbulence stimulation device in the model experiment on ship form Actual ship thrust measurement as a means of breaking down the correlation allowance into its components (abstract) Some experiments of yawing effect on ahead resistance of ships (abstract) Further experiments of yawing effect on ahead resistance of ships (abstract) Frictional resistance in towing tanks Variation of viscous drag with froude number The influence of form and scale on model and ship resistance Formal contribution On the flat plate experiments of Kyushu University (abstract) Some remarks on the logical approach of model ship correlation Considerations on the experimental determination of the form effect from results about transition line Form effects on viscous resistance and their estimation for full ships Testing of standard model - Kryloff Shipbuilding Research Institute The effect of loading on wake and thrust deduction Some remarks on the logical approach to ship model correlation The influence of scale or size on ship model tests involving propeller generated vibration Propulsion trial code Recent studies by the British Towing Tank Panel of ship model correlation Calculation of the hydrodynamic exciting damping coupling and inertial forces of ship propellers based on wake distribution and90767 Terminal compatibility MER

    Authors

    Nat Phys Lab

    Publisher

    Min of Tech

    Shelf Location

    213c

    Date published

    1963

  • Laboratory experiments on the hydrodynamics of waves on adverse currents

    Authors

    L Cappietti

    Date published

    2003

    Abstract

    A series of laboratory experiments was conducted in a flume to study the effects of adverse currents on regular and irregular waves. The transformation of regular and irregular waves on a sloping bed was studied with and without currents. Effects of the currents on the waves transformations are reported. After some introductory information the experiments are described. Next the results are considered.

    Authors

    L Cappietti

    Date published

    2003

  • Report on the investigation of the failure of a warp block on board the UK registered fishing vessel OCEAN STAR north of the Shetland Islands resulting in one fatality on 26 November 2001

    Authors

    Marine Accident Investigation Branch

    Shelf Location

    40d

    Authors

    Marine Accident Investigation Branch

    Catalogue number

    UNK

    Shelf Location

    40d

  • Study on localized corrosion on cargo oil tank bottom plate of oil tanker

    Authors

    K Katoh ; S Imai ; D T Yasunaga et al.

    Date published

    2003

    Abstract

    'The study on cargo oil tank (COT) corrosion of oil tanker' has been carried out by 'The Shipbuilding Research Association of Japan Panel #242 (SR242) committee' for 3 years supported by the Nippon Foundation. The main objectives of this study were - (1) Making facts clear on VLCC localized corrosion on bottom plate scientifically (2) clarifying differences in localized corrosion behaviour between double hull (D/H) and single hull (S/H) and (3) reconfirmation that localized corrosion behaviour of mild steel (MS) and TMCP steel is the same. The wide range of studies by onboard inspections and laboratory tests on localized corrosion on bottom plate was carried out. In this study intensive field examinations are conducted for technical understanding of fact. 7 VLCCs including single hull and double hull have been examined. Key findings are looked at.

    Authors

    K Katoh ; S Imai ; D T Yasunaga et al.

    Date published

    2003

  • Environmental Forces on Offshore Structures and Their Prediction Volume 26 of Advances in Underwater Technology, Ocean Science and Offshore Engineering

    Authors

    Society for Underwater Technology (SUT)

    Shelf Location

    213a

    Abstract

    Conf held by SUT in London 28-29 November 1990 Papers are The use of joint probability in deriving environmental design criteria The effect of frequency spreading on a two component sea state Wave kinematics within the crest to trough region Review of recent analytical and approximate solutions of wave-current interaction Wave current interaction In-line forces on fixed cylinders in regular and random waves Marine roughness and fluid loading On the effects of wake re-encounter for wave forces on cylinders Wave and current forces on conductor pipe groups Coupled experimental and analytical investigation of hydrodynamic forces on a jacket in waves Slender well conductor design Applicability of 3-D wave loads in offshore design A critical assessment of Turkstra's Rule related to the reliability of offshore structures A new stress range distribution model for fatigue analysis under wave loading Environmental loading on fixed offshore platforms Prediction of loads on floating production systems Wind loading and dynamic response of a floating production platform in waves Wave-drift damping of a TLP Effects of joint probability and short crestedness in designing a compliant structure

    Authors

    Society for Underwater Technology (SUT)

    Publisher

    Kluwer Academic

    Shelf Location

    213a

    Date published

    1990

  • Influence of cavitation on the force acting on a single blade

    Authors

    V Vujanic ; B Velensek

    Date published

    1995

    Abstract

    Forces acting on a single blade placed in a water tunnel were experimentally investigated with the main focus being on the lift to drag ratio in different flow conditions. The intention was to locate the influence of cavitation and blade inclination on the lift to drag ratio and to discover optimum flow regimes even in cavitation conditions. The experimental apparatus is described. The results are presented and analysed.

    Authors

    V Vujanic ; B Velensek

    Date published

    1995