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Real time 3D display of hydrographic data for QA and QC
AuthorsRoland Arsenault
Shelf Location214c
AbstractA RTG (real-time gridding) system is a work in progress. It is being developed to enable real-time quality control during multi-beam sonar surveys. RTG displays geo-referenced gridded data as it is collected from the multi-beam sonar. The system is capable of integrating historic data while building a surface that grows as the new data is being collected all in a geo-referenced 3D environment. Other data such as position and attitude of the ship or towed vehicle can also be displayed in real time in order to give the user a full picture of the complete data acquisition process as it is happening. The real-time display of geo-referenced sounding data is an invaluable tool for identifying both systematic artefacts and outliers. The technology developed to enable such a system is described. The system has been tested on off-the-shelf PCs with added 3D video cards running Linux or Windows NT. The next step is to test the system in real working environments to find any deficiencies and areas of possible enhancement.
AuthorsDate publishedRoland Arsenault
2001
Shelf Location214c
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Real-time management of sewage disposal in the coastal zone
AuthorsV G Koutitonsky ; N K Gidas
Date published1996
AbstractNormally a sewage outfall diffuser is built at a coastal site where the effluents are well diluted or advected away from sites to be protected. The proposed concept of intermittent effluent release applies to those cases where a selected site must be rejected due to its adverse effects on local resources or in the case of an existing diffuser of untreated sewage which must be upgraded at high costs to meet environmental regulations. The approach used to determine tidal phase intervals during which effluents could possibly be released is described along with how their release can be controlled in real-time. A case study is presented for the city of Rimouski.
AuthorsV G Koutitonsky ; N K Gidas
Date published1996
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Recent advances in offshore pipeline technology - the Troll oil pipeline and Haltenpipe projects
AuthorsF Blaker ; E Gjertveit ; J Breivik
Date published1995
AbstractDiscussion is presented of pipeline installation technology with reference to the achievements on the Troll oil pipeline and the Haltenpipe projects. The two projects face similar technical challenges such as irregular seabed conditions requiring highly accurate mapping careful routing free span design seabed preparation works and special low tension lay techniques. Aspects considered include: use of advanced subsea mapping and positioning technology hydraulic flow modelling simulating unique flow conditions inside a deep and narrow fjord control of multiple free span behaviour by use of advanced design methodology use of strain based criteria to reduce large scale seabed correction works and high precision pipelay in deep waters involving guided laying to assure the correct position of the pipeline across pre-installed gravel berms and at lateral counteracts.
AuthorsF Blaker ; E Gjertveit ; J Breivik
Date published1995
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Recent research into formal safety assessment for shipping: Lloyd's Register Technical Association Session 1995-1996 Paper No 7 23pp
AuthorsE G Brennan ; J H Peachey
Shelf LocationINTERNAL
AbstractResearch work which addresses the first two steps of the Formal Safety Assessment (FSA) approach concerned with hazard identification and screening and with risk evaluation and assessment is presented. Hazards capable of affecting ships are identified as collision contact with other objects explosion natural and other external hazards fire flooding grounding or stranding hazardous substances loss of hull integrity machinery failure and payload related hazards. Hazards are screened and ranked and risk evaluated. A FSA methodology has been specifically developed appropriate to international shipping based on existing risk analysis techniques integrated into a robust and comprehensive mechanism suitable for marine hazards. IMO is in the position to make effective use of FSA.
AuthorsPublisherE G Brennan ; J H Peachey
LRTA
Shelf LocationDate publishedINTERNAL
1995
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Reduction of emissions of a high efficient diesel engine with solenoid-controlled injection pump by means of water injection
AuthorsE Kamleitner ; H Haury
Date published2001
AbstractIn power applications in Europe the use of high-performance diesel-engines presents both particle and NOx emissions problems. It is state of the art to use water-injection to reduce these emissions in engines equipped with standard injection systems. A solution is presented which uses water- injection on an engine with solenoid-controlled single- injection units. Emissions improvements are described together with the measures implemented to obtain these results. Finally problems caused by the use of water in the sensitive area of a high-tech injection system are discussed.
AuthorsE Kamleitner ; H Haury
Date published2001
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Relative position estimation for AUVs by fusing bearing and inertial rate sensor measurements
AuthorsAndreas Huster ; Eric W Frew ; Stephen M Rock
Date published2002
AbstractRelative position estimation and control are core requirements for intervention-capable AUVs (autonomous underwater vehicles) an emerging class of underwater vehicles capable of carrying out autonomous manipulation tasks such as placing sensors and retrieving samples. A new relative position sensing system is presented based on a simple robust vision system and inertial rate sensors (accelerometers and rate gyros). The aim is to develop an overall solution that is sufficiently robust to function in real operational underwater environments which pose significant challenges for the implementation of vision-based sensing. The sensor fusion problem is defined and models for the vision and inertial rate sensor measurements the dynamics and disturbances are presented. Relevant problems in non-linear estimation are discussed. The estimator design is described. A method to design useful observer trajectories is developed.
AuthorsAndreas Huster ; Eric W Frew ; Stephen M Rock
Date published2002
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Reliability analysis of a moored tanker under environmental loads
AuthorsI Q Masetti ; E C P de Lima ; R A de Oliveira et al.
Date published1995
AbstractThe dynamic behaviour of a floating storage and off-loading (FSO) tanker moored by eight combined chain-wire lines has been investigated. The FSO is operating on a temporary basis for Petrobras with a semi-submersible production unit and a shuttle tanker. The design criteria of the mooring system are described in detail. The computer program DMOOR was used for the dynamic mooring calculations. The failure probability was calculated for environmental loading in two directions: 45 degrees and 90 degrees. The difference in the probability demonstrated the need for a Differentiated Compliant Anchoring System (DICAS) that can automatically rotate the tanker away from 90 degree loading.
AuthorsI Q Masetti ; E C P de Lima ; R A de Oliveira et al.
Date published1995
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Reliability Analysis of Pipelines During Laying - Considering Ultimate Strength Under Combined Loads
AuthorsR T Igland ; T Moan
Date published1998
AbstractStructural reliability methods are applied to establish a measure of safety for pipelines during laying and especially to calibrate semi- probabilistic ultimate limit state criteria based on measures of uncertainty method of reliability and a given target level. Ultimate collapse of thick tubes under combined external pressure tension and bending loads are studied using the finite element method. Non-linear effects of large deformations effects of initial ovality residual stresses strain-hardening yield anisotropy and loading paths are accounted for in the analysis. A set of interaction equations is proposed. Load effects in the pipelines during installation by the S-lay method are studied. A combination of design point calculation and importance sampling procedure is used to calculate the probability of failure. The study includes calibration of partial safety factors for the design format selected.
AuthorsR T Igland ; T Moan
Date published1998
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Reliability Analysis of Specially Orthotropic Plates Using Hasofer-Lind’s Safety Index Method
AuthorsH-K Jeong ; R A Shenoi
Date published1998
AbstractHasofer-Lind’s safety index method is used to perform the reliability analysis of specially orthotropic plates subjected to uniform lateral pressure loads. Applied uniform lateral pressure loads materials properties geometric and ultimate strength values of the plates are treated as basic variables and generated in accordance with their assumed probability distributions by using statistical sampling techniques. The strength analysis is linear elastic in nature based on classical laminated plate theory. The limit state equations are developed by using anisotropic failure criteria such as maximum strain and Tsai-Wu. Mean and standard deviation of the calculated stress components and ultimate strength values of the plates are derived and they are substituted into the limit state equations to evaluate the safety index.
AuthorsH-K Jeong ; R A Shenoi
Date published1998
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Remote sensing of water quality in the Baltic Sea with MODIS satellite sensor
AuthorsS Koponen
Date published2002
AbstractImages acquired by the MODIS satellite spectrometer are used to retrieve water quality information in the Baltic Sea. Modis data are obtained and studied. Those channels suitable for monitoring surface-floating algal blooms and turbidity are identified and it is shown that the colours present in the images may contain information about the depth of the algae. It is concluded that the relatively good resolution and daily overpasses due to the wide measurement swath make MODIS well suited for algae monitoring. The results derived from MODIS data are in accordance with the spatial distribution of the phytoplankton biomass simulated with a hydrodynamic water quality model in the Neva Estuary that is characterised by large water quality variations. Diagrams and graphs appear on pages 5 to 8.
AuthorsS Koponen
Date published2002
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Report of Committee V.6 - Condition assessment of aged ships and offshore structures
AuthorsISSC 2009
Date published2009
AbstractThe committee mandate involves concern for the assessment of the serviceability and safety of aging ships and offshore installations. This includes reliability-based assessment of age-related structural degradation inspection maintenance and repair. Consideration is given to cost-benefit and risk-based decision procedures. Chapter 1 consists of the introduction. Next Chapter 2 describes the structural degradation mechanisms that may pose threats to the structural integrity of aging steel structures. This chapter also provides the background about the problems the Committee is assigned to cover. Chapters 3 and 4 summarize the current industry practice and emerging trends of condition assessment. Descriptions are given of the concept and methodology of structural integrity management (SIM) and risk-based inspection (RBI). Chapter 5 is devoted to structural reliability approach. Chapters 6 and 7 discuss the research and development on corrosion coating and fatigue. Each of the Chapters 2 to 7 concludes with a list of recommendations for further studies related to the topics within each chapter. Chapter 8 summarizes the entire report which lists key topics this Committee feels will require greater focus of future research and development.
AuthorsISSC 2009
Date published2009
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Report of the first regional workshop of the Bay of Bengal large marine ecosystem programme (BOBLME) : 17-21 February 2003, Pattaya, Thailand : Volume 2
Authorseditor: P A Verlan
Shelf Location226d
AbstractVolume 2 of this report includes the keynote addresses and presentations on topics such as transboundary diagnostic analysis; an ecosystem approach to fisheries management; marine fisheries resources and marine environment in Bangladesh; coastal zone management in India; status of and threats of living marine resources in India, Indonesia, Maldives, Myanmar and Sri Lanka, and the sea marine ecosystem in Thailand.
AuthorsPublishereditor: P A Verlan
Food and Agricultural Organization of the United Nations
Shelf LocationDate published226d
2003
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Report of the re-opened formal investigation into the loss of the MV Derbyshire
Authorsthe honourable Mr. Justice Colman
Shelf Location15a
AbstractThis is the report into the reopened investigation into the loss of the MV Derbyshire on the 9th September 1980 during Typhoon Orchid off Okinawa. It states that the Derbyshire would certainly not have been lost had it not encountered extremely severe seas close to the centre of Typhoon Orchid. Evidence from the wreckage site and MARIN model tests carried out infer that the loss of the MV Derbyshire was caused by; damage to ventilators and airpipes that admitted substantial volumes of seawater to the machinery spaces; hatch covers damaged by impact; starboard windlass broke loose by reason of hydrodynamic loading.
AuthorsPublisherthe honourable Mr. Justice Colman
Norwich: Stationery Office, 2000.
ISBN number117025305
Shelf LocationDate published15a
2000
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Research in combined generation system of marine electric power plant
AuthorsX Xu
Date published2002
AbstractDynamic models of three types of generation systems of marine electric power plant are established. These include the generation system of diesel generator that of the main shaft generator and that of the exhaust gas turbo-generator. The combined generation system is researched on its behaviour in fuel consumption and reliability of electric power supply as well as its contributions to the safety of navigation. The results show that the combined generation system of diesel generator main shaft generator of converter type and exhaust gas turbo-generator is the best choice for fuel consumption. It also ensures that the electric power supply is uninterrupted during transformation from one type to another type of generation. Additionally it promotes safety when the main engine is working under fault conditions.
AuthorsX Xu
Date published2002
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Research in Maritime History no. 28: New Directions in Mediterranean Maritime History
Authorsedited by Gelina Harlaftis and Carmel Vassallo
Shelf Location338b
AbstractTable of Contents Contributors / iii-v Preface / vii-viii Contributions Gelina Harlaftis and Carmel Vassallo, "Maritime History since Braudel" / 1-19 Marina Alfonso Mola and Carlos Martínez Shaw, "Maritime Historiography in Acien Régime Mediterranean Spain" / 21-44 Xavier Labat Saint Vincent, "Trade in the Mediterranean in the Early Modern Era: A Brief Review of the French Literature" / 45-53 Michela D’Angelo and M. Elisabetta Tonizzi, "Recent Maritime Historiography on Italy" / 55-82 John Chircop, "Maltese Maritime Historiography: A Critical Assessment" / 83-101 Flavio Bonin, "Slovenia" / 103-109 Gelina Harlaftis, "Greek Maritime History Steaming Ahead" / 111-123 Gerassimos D. Pagratis, "Sources for the Maritime History of Greece (Fifteenth to Seventeenth Century)" / 125-146 Eyüp Özveren and Onur Yildirim, "An Outline of Ottoman Maritime History" / 147-170 Ruthy Gertwagen, "Maritime History in Israel" / 171-188
AuthorsPublisheredited by Gelina Harlaftis and Carmel Vassallo
St. John's, Nfld. : International Maritime Economic History Association, c2004.
ISBN number973007389
Shelf LocationCatalogue number338b
387.091822
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Resistance and propulsive performance trials of the MV Terry Fox and MV Ikaluk in level ice
AuthorsB Cowper ; R Browne ; I Glen et al.
Date published1992
AbstractTwo CASPPR Arctic Class IV icebreakers with geared diesel propulsion were used in sea trials in Herschel Basin Yukon to obtain data on ship resistance propulsor performance and hydrodynamic interaction. Study results included vessel resistance in level ice over a range of speeds self-propulsion power and thrust over a range of speeds and thrust deduction in level ice and open water of the two systems. Data from these tests will be used to validate or improve techniques used for predicting icebreaker power performance from model tests and empirical or analytical models.
AuthorsB Cowper ; R Browne ; I Glen et al.
Date published1992
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Resistance of a systematic series of semi-planing transom-stern hulls
AuthorsRoger H Compton
Date published2006
AbstractThe results of a systematic series of small (5 foot) models of hulls typical of coastal patrol training or recreational powerboats are presented and discussed. Hull form parameter studies include length-to-beam ratio displacement-length ratio longitudinal position of the centre of gravity and section shape (hard chine or round bilge). The effects of these parameters on the calm-water resistance and running attitude (sinkage and trim) over a range of speeds corresponding to waterline length Froude numbers from 0.10 to 0.60 were investigated in a 120-foot towing tank. Experimental procedures and computer-based data acquisition and analysis methods used at NAHL (the US Naval Academy Hydromechanics Laboratory) are described. The experimental results as well as the cross-fired and non-dimensionalised stillwater resistance trends are presented. Comparisons with other resistance prediction methods for hulls of the subject type are made. An example of the application of the resistance prediction to the new 108-foot YP (yard patrol) craft being acquired by the US Naval Academy is included.
AuthorsRoger H Compton
Date published2006
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Resistance prediction of planing hulls: state of the art
AuthorsJohn M Almeter
Date published2006
AbstractThere are many different ways in which the boat designer can predict the resistance of planing hulls. The term planing hull is used generically to describe the majority of hard chine boats being built today. No single prediction method is good for all types of planing hulls. Some methods can be relied upon to give good predictions for certain boats and other methods cannot be relied upon at all. This paper is meant as a reference for designers in selecting resistance prediction methods for planing hulls. Numerous resistance prediction methods are described and their variable ranges are given as well as the type of planing hulls that they are based on or intended for. Inherent problems or limitations of the methods are given. The concept of hull shape which is often neglected in resistance prediction and its important role are discussed.
AuthorsJohn M Almeter
Date published2006
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Response Amplitude Operator of Motions in Regular and Random Oblique Waves
AuthorsS A Sannasiraj ; V Sundar ; R Sundaravadivelu
Date published1998
AbstractThe behaviour of freely floating long structure due to the interaction of regular and random oblique waves is studied experimentally. The sway heave and roll responses due to the action of long crested oblique waves evaluated using the two dimensional finite element technique (Sannasiraj et al. 1995) are compared with experimental investigations and good agreement is found. The response amplitude operators (RAO) for the regular and random wave tests are compared well and hence the interaction between wave and long floating structure is linear. The effect of wave direction on the motion response is discussed in detail. The angle of wave approach is found to essentially reduce the response of the structure.
AuthorsS A Sannasiraj ; V Sundar ; R Sundaravadivelu
Date published1998
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Response of the mega-float equipped with novel wave energy absorber
AuthorsSotaro Masanobu ; Shunji Kato ; Katsuya Maeda et al.
Date published2003
AbstractThe hydroelastic response is significant from the viewpoint of the structural design of a Mega-Float. Equipping a Mega-Float with some additional structures such as vertical plates is one of the ways to reduce the hydroelastic response easily. However in general wave drift force acting on the Mega-Float may be increased when the Mega-Float is equipped with the additional structures to reduce the response. In the present study a novel additional structure was developed that was effective in the reduction of both hydroelastic response and wave drift force. Furthermore the response of a Mega-Float equipped with the additional structures was estimated and the result was compared with the value measured in at-sea experiments.
AuthorsSotaro Masanobu ; Shunji Kato ; Katsuya Maeda et al.
Date published2003