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22981 results Most recent
  • Vortex shedding induced oscillations on pipelines resting on very uneven seabeds - predictions and countermeasures

    Authors

    R Bruschi ; P Simantiras ; L Vitali et al.

    Date published

    1994

    Abstract

    It is important to establish a recognised approach regarding pipe lengths in suspension under vortex shedding induced vibrations (VIV). Several projects have been carried out to improve knowledge of VIV on submarine pipelines. Many aspects have been examined in the laboratory and in the field. Some aspects of the hydroelastic excitation and response are examined. The focus is placed on prediction tools. Countermeasures are discussed particularly hydrodynamic devices to tackle VIV. Experimental laboratory data on slender tubulars is discussed.

    Authors

    R Bruschi ; P Simantiras ; L Vitali et al.

    Date published

    1994

  • Effects of avoidance of heavy weather on the wave induced load on ships

    Authors

    Zhi Shu ; Torgeir Moan

    Date published

    2005

    Abstract

    Wave-induced hull girder loads such as vertical bending moment amidships are very important for design. The effect of heavy weather avoidance on the long-term wave-induced loads on ships is evaluated. Two hydrodynamic codes VERES based on a 2D strip theory and WASIM based on a 3D Rankine panel method are used to calculate the wave-induced loads and motions on various vessels. Two models for heavy weather avoidance are proposed. The first is based on the assumption that operational criteria relevant to vertical acceleration green water and bottom slamming are fulfilled. The second is based on the assumption that the sea state forecasts are available to the shipmaster and that rerouting is made. Based on the first model considering avoidance of heavy weather and the hydrodynamics results calculated from two codes wave-induced hull girder loads are obtained. The results are discussed - in particular the effect of different hydrodynamic codes and various scatter diagrams. The long-term prediction of wave-induced hull girder loads considering the effect of avoidance of heavy weather will give a relatively more realistic evaluation of the extreme hull girder loads. Finally the results from ship rules are also re-evaluated compared with the long-term prediction with and without heavy weather avoidance.

    Authors

    Zhi Shu ; Torgeir Moan

    Date published

    2005

  • Developments on exhaust emission modelling for large two-stroke diesel engines - some comparisons with measured data and an update on the latest emission reduction techniques

    Authors

    Niels Kjemtrup ; Kjeld Aabo ; Thomas Knudsen

    Date published

    2007

    Abstract

    The continuous development of the MAN B&W Diesel two-stroke engines within the field of exhaust gas emission reduction methods is presented. A variety of approaches used towards a better description of emission formation inside the combustion chamber are discussed. The modelling tools described cover a range from simple 0D and 1D formulations to complex state of the art 3D CFD models with advanced sub-models for spray combustion and pollutant formation. And on the experimental side details are given on extensive parametric studies with the in-house two-stroke test engine. Further a novel study on large engine fuel injection is presented using latest technology high-speed imaging techniques. In addition to the in-house tests all major engine test results from production sites since year 2000 have been recorded in a database allowing the statistical analysis of engine test data across engine type engine configuration and of course engine operating conditions. Major results from an extensive ongoing data-mining activity on the basis of this database are given. In particular the results confirm the full potential of the electronic-controlled engine with variable injection-rate profiling. Finally status on development issues such as SAM (Scavenging Air Moistening) TES (Thermo Efficiency System) and use of turbochargers with VTA (Variable Turbine Area) are outlined.

    Authors

    Niels Kjemtrup ; Kjeld Aabo ; Thomas Knudsen

    Date published

    2007

  • Reports on Researches carried out in the William Froude National Tank, between the years 1908-1921

    Authors

    National Physical Laboratory

    Shelf Location

    235g

    Abstract

    Contents include: Report of the Experimental Tank Committee (1908), Report on the progress of the National Experimental Tank, The William Froude National Tank and its equipment. Also, the following articles: The effect of bilge keels on the rolling of lightships; Methodical experiments with mercantile ship forms; Effect of form and size on resistance of ships; Skin friction; Effect of longitudinal motion of a ship on its statical transverse stability; Speed, dimensions and form of cargo vessels; Model experiments on the effect of beam on resistance of mercantile ship forms; Model experiments in connection with submarine warfare. Includes numerous charts and diagrams.

    Authors

    National Physical Laboratory

    Publisher

    London ; His Majesty's Stationery Office (HMSO)

    Catalogue number

    623.8

    Shelf Location

    235g

    Date published

    1924

  • CFD investigation of the effect of current turbulence on the hydrodynamic forces on a cylinder

    Authors

    Hyung Taek Ahn ; Yannis Kallinderis

    Date published

    2005

    Abstract

    The inflow turbulence effect on the hydrodynamic forces exerted on a circular cylinder was investigated by using Reynolds-averaged Navier-Stokes simulations. The range of Reynolds numbers considered was from low sub-critical to supercritical. Time step and mesh resolution studies with various Reynolds numbers were performed for resolution of inflow turbulence. All cases of current profile turbulence were also compared to their corresponding uniform current cases in terms of the amplitudes and frequencies of the forces.

    Authors

    Hyung Taek Ahn ; Yannis Kallinderis

    Date published

    2005

  • Corrosion in Scotch marine boilers - II. Model boiler tests on the influence of the copper content of the steel on the corrosion of tubes in artifical sea water

    Authors

    G Butler ; H C K Ison

    Date published

    1957

    Abstract

    Model Scotch marine boilers containing mild steel tubes of varying copper contents were operated on artifical seawater feedwaters differing in pH and oxygen content. The effects of steel and water composition on tube corrosion pitting and perforation are discussed.

    Authors

    G Butler ; H C K Ison

    Date published

    1957

  • Experimental study on the influence of the crest width on the deformation of submerged breakwater

    Authors

    Susumu Araki ; Toshihiro Miyazaki ; Ichiro Deguchi et al.

    Date published

    2001

    Abstract

    Design method in case deformation is permitted has been investigated for rubble mound breakwaters recently. This paper describes the deformation of submerged breakwaters to investigate the process of the collapse and to establish the design procedure in case the deformation is permitted. Classification of deformation change in crest heights influence of core on deformation quantification of deformation and change in hydraulic performances are discussed based on the results of two-dimensional experiments. There was a large difference in the deformed crest heights among the submerged breakwaters with different crest widths.

    Authors

    Susumu Araki ; Toshihiro Miyazaki ; Ichiro Deguchi et al.

    Date published

    2001

  • Initial Studies on the Design of a Clamp-On Ultrasonic Flowmeter for Wet Gas Pipelines

    Authors

    D Vedapuri ; M Gopal

    Date published

    2000

    Abstract

    This paper describes the design philosophy of a clamp-on ultrasonic flow meter for wet gas pipelines and discusses the challenges involved in the design. The project goal is to design a meter that will provide both the gas and the liquid flow rate. The liquid flow rate monitor can also be used with conventional gas metering systems to recalibrate meters.

    Authors

    D Vedapuri ; M Gopal

    Date published

    2000

  • Regular waves acting on double-layer perforated caissons

    Authors

    Xuefeng Chen ; Yucheng Li ; Dapeng Sun

    Date published

    2002

    Abstract

    Most experimental analysis and theoretical studies on wave-acting structure interactions concentrate on single-layered perforated caissons with great success. However few studies focus on the double-layered perforated caisson. Here reflection coefficients and total horizontal forces of the double-layered perforated caissons under regular wave action are experimentally investigated. Empirical relationships between reflection coefficients and the ratio of total horizontal forces on the double-walled perforated caissons to those on solid vertical walls with various factors such as the overall relative chamber width the relative water depth and the porosity of the front perforated wall are given. These relationships may be used for engineering applications.

    Authors

    Xuefeng Chen ; Yucheng Li ; Dapeng Sun

    Date published

    2002

  • 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

  • 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

  • Environmental forces on engineering structures

    Authors

    edited by C A Brebbia, P L Gould, J Munro

    Shelf Location

    224e

    Abstract

    Conf held in July 1979 in London Papers are Environmental loadings on concrete cooling towers - types likelihood effects and consequences Numerical simulation of three-dimensional separated flow; a first step Wind loading on structures Safety considerations for natural draught cooling towers under wind load Dynamic effects of wind on offshore towers Effects of soil-structure interaction on the dynamic along-wind response of structures The wind induced dynamic response of the Wye bridge Investigation on the vibrational behaviour of a cable-stayed bridge under wind loads A study of the measured and predicted behaviour of a 46-storey building Experimental study of wind forces and wind-induced vibrations at a steel lighthouse tower Simplified models of large-wind-turbine open-truss tower Wind loading and missile generation in tornado Earthquake floor response and fatigue of equipment in multi-storey structures An integrated procedure to compute wave loads on hybrid gravity platforms Wave forces on elliptical cylinders by finite element method Dynamic analysis of marine risers involving fatigue and corrosion Spectral dynamic fatigue analysis of the ANDOC DUNLIN `A' platform A computational approach for the analysis of fixed offshore structures including piling Slam load histories on cylinders Theoretical analysis on the transverse motion of a buoy by surface wave Probabilistic design of a fibre-reinforced concrete floating pontoon A structural problem of piers resting on piles

    Authors

    edited by C A Brebbia, P L Gould, J Munro

    Publisher

    Pentech Press

    Shelf Location

    224e

    Date published

    1979

  • Formal Safety Assessment Study on the Effects of Introducing Helicopter Landing Area (HLA) on Cruise Ships

    Authors

    G Guassardo ; G Demaria

    Shelf Location

    233c

    Abstract

    This publication reviews the current rescue procedures by helicopters at sea, and looks at the availability of search and rescue helicopters, rescue of a person on a vessel, estimation of the expected number of persons rescued by helicopters following a casualty, risk considerations, and considerations on the impact on the design.

    Authors

    G Guassardo ; G Demaria

    Publisher

    IMO-Italy

    Shelf Location

    233c

    Date published

    1998

  • Nonlinear Wave Forces on a Marine Pipeline Buried in a Sand Seabed

    Authors

    Ayman M Mostafa ; Norimi Mizutani

    Date published

    2002

    Abstract

    Pipelines are sometimes installed over or in the seabed away from the shoreline. They are used to transport fluids to or from offshore sites and from or to the shore or on a short cut across a bay. Whether the pipe runs over the seabed or is buried in it depends on various conditions including wave and current. In both cases pipes are influenced by wave and current forces but at variable degrees. Here the focus is on the non-linear wave forces acting on a submarine pipeline buried in a sand seabed of finite thickness. The problem is investigated both numerically and experimentally to confirm the validity of results. Analysis is further made for the effect of wave conditions on the wave forces acting on the pipeline. The experiments have been carried out in a 2D wave tank to measure the water surface levels in the pipe vicinity and the pore pressure around the pipe surface. The BEM-FEM model is modified to simulate the wave deformation and the porous flow around the pipeline. The wave forces on the pipe have been computed by integrating the pore pressure around the pipe surface. The results have been compared with the forces computed from pressure measurements in the experiment. Special attention has been given to the effect of wave conditions on the vertical uplift forces in comparison with the horizontal one.

    Authors

    Ayman M Mostafa ; Norimi Mizutani

    Date published

    2002

  • On estimation of ship rolling motion with flooded water on vehicle deck

    Authors

    Toshifumi Fujiwara ; Tomihiro Haraguchi

    Date published

    2002

    Abstract

    The ro-ro passenger ship 'Estonia' sank in 1994 because she a large amount of water flooded her vehicle deck. To prevent further such disasters the safety of damaged ro-ro passenger ships has been discussed by IMO. The validity of a time domain simulation method is investigated for the rolling motion of a ro-ro passenger ship with a flooded vehicle deck expressed by a 2D lump mass concept. Model experiments using different amounts of water on deck were carried out to confirm the effectiveness of the method in regular beam waves. As a result the simulation method on rolling motion shows a reduced roll response caused by moving water on deck. Roll amplitudes obtained from the simulation are in good agreement with experimental ones. The present method could be used to assess the safety of ro-ro passenger ships with damaged holes and floodwater on deck.

    Authors

    Toshifumi Fujiwara ; Tomihiro Haraguchi

    Date published

    2002

  • The influence of environment on fatigue

    Authors

    IMechE

    Publisher

    IMechE

    Abstract

    Conf held in London 18 - 19 May 1977 Papers are Fundamental and practical aspects of crack growth under corrosion fatigue conditions Quantitative understanding of the effects of mechanical and environmental variables on corrosion fatigue crack behaviour Preliminary results of effect of environment on the low cycle fatigue behaviour of Type 316 stainless steel and 9% Cr ferritic steel The effect of environment and frequency on crack nucleation Stage 1 and II crack growth in two aluminium zinc magnesium alloys The influence of low oxygen and contaminated sodium environments on the fatigue behaviour of solution treated AISI 316 stainless steel Environmental effects on fatigue crack initiation and propagation in a cast steel Mechanisms affecting chemistry and material properties at crack tips in metals The effect of pressurized water reactor environment on fatigue crack propagation of pressure vessel steels A quantitative assessment of the superposition model of corrosion fatigue The effect of frequency and temperature on environmentally assisted fatigue crack growth below K1SCC in steels Cracking in 500 MW L P rotor shafts

    Authors

    IMechE

    Date published

    1977

    Publisher

    IMechE

  • The Elbe river - a life line for Northen Germany: the sense of maintenance dredging on the Elbe and the future requirements for its navigational fairway

    Authors

    N Marusic ; C Iwens

    Date published

    2007

    Abstract

    The future deepening of the Elbe will be a groundbreaking innovation of environmental and marine engineering. This is described. First there is an historic review addressing historical development on the deepening and maintenance dredging works on the ELBE trading position of the harbour of Hamburg. Next a look is taken at the current maintenance dredging concept on the Elbe dealing with longer sailing distances and correlation to the TSHD types along with pilot tests with water injection dredgers in order to optimize hopper planning. After this consideration is given to the future for maintenance dredging on the Elbe including new relocation areas under investigation on the Elbe research programme of the Federal Institute of Hydrology (BfG) for new relocation areas and its impact on the habitat of fauna and flora. Lastly attention is given to the future deepening of the Elbe covering the licensing process and the time frame (planning) economic benefits and socio-economic impact on the Hamburg metropolitan area hydraulic engineering concepts and dredging techniques.

    Authors

    N Marusic ; C Iwens

    Date published

    2007

  • Interim report on ballast water exchange - study on ballast water exchange methods in Japan

    Authors

    H Yamamoto

    Date published

    2001

    Abstract

    This interim report outlines the current movement of the ballast water control in IMO and regional areas in Part 1 and introduces the essential part from the latest study in Japan on ballast water exchange methods in Part 2.

    Authors

    H Yamamoto

    Date published

    2001

  • International symposium on fire safety of ships Vol 2

    Authors

    IMO ; HMMM

    Shelf Location

    223a

    Abstract

    Int Symp held in Piraeus Greece on 9-11 May 1990 Papers are On fire! The need for new thinking Fire protection on large cruiser ships Fire safety on passenger vessels operating in the United States of America

    Authors

    IMO ; HMMM

    Publisher

    Hellenic Institute of Marine Technology

    Shelf Location

    223a

    Date published

    1989

  • Research on calculation method and simplified on-board measurement of NOx-emission from marine diesel engine

    Authors

    Yin Zibin ; Wu Guitao ; Dai Leyang

    Date published

    2004

    Abstract

    For meeting the requirements and the characteristics of the on-board test of NOx-emission from marine diesel engines a new calculation method different from IMO's methods is put forward. An approximate calculation methods based on the new method and simplified measurement are also discussed. The calculation example and error analysis indicate the correctness of the new method and the feasibility of simplified on-board measurement of NOx-emission. The on-board test of NOx-emission becomes more practical and feasible by using handy gas analyzer.

    Authors

    Yin Zibin ; Wu Guitao ; Dai Leyang

    Date published

    2004