Items

  • SIMULATION OF FUEL INJECTION PIPE PRESSURE

    SABAU Adrian; DUMITRACHE Constantin; BARHALESCU Mihaela
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Fuel injection pipe pressures are measured and simulated to study the effect of fuel injection pipe length on the injection system characteristics in a direct injection diesel engine. The fuel injection simulation is based on a linear model. The governing equations are solved by the finite difference method.
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  • ANALYSIS OF TRANSIENT DIESEL-ENGINE

    SABAU Adrian; BARHALESCU Mihaela; DUMITRACHE Constantin
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    A computer analysis has been developed for studying the energy and exergy performance of an direct-injection, naturally-aspirated diesel engine operating under transient load or speed conditions. The model is validated at steady-state operation and incorporates many novel features for simulating the transient response and analyzing all of the engine availability terms. The analysis reveals via multiple diagrams how the exergy properties of the dieselengine subsystems vary according to the engine cycles for various speed and load changes. The diagrams also show the current-speed response. In addition, the effects of operating parameters such as the intensity of the applied change or heat loss to the walls are described from first- and second-law.
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  • THE SEAFARERS’S LONELINESS; A FACTOR OF RISK FOR MARITIME SAFETY

    RODRÍGUEZ-MARTOS Ricardo
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Very often, when speaking about reduction of crews the shipping industry just thinks about the technical possibilities for such reductions. Unfortunately it will be paid less attention to the sociological and psychological impact, which can put into risk the vessel and the crew. There are several human consequences of crew reduction that should be taken in account according to the different kind of trips and also to the general possibility of crews to communicate among themselves. The communication language and the availability of somebody to speak are both, very important. Boredom can also affect concentration and attention. The loneliness feeling can, on the other hand, propitiate the consume of drugs in the case of people with some tendency to addictions. In this paper we will analyze these factors and suggest also some guidelines for the future.
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  • ANALITIC METHOD FOR THE TEMPEREATURE DISTRIBUTION INSIDE THE CILINDER WALLS

    OMOCEA Ion; TURCOIU Titi
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Is important to determine the temperature distribution inside the cylinder walls as well as on the two faces of the cylinder. It’s necessary to be able to predict any deterioration of the material due to thermal stresses.
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  • ENGINE ROOM SIMULATOR ERS4000 USE FOR ANALISIS OF ENERGY EFIICIENCY OF INTEGRATED SHIP ENERGY SYSTEM

    NEDEV Marin; ANGELOV Nikolav; PETKOV Petko
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The fuel consumption and GHG emissions from shipping are directly associated with energy efficiency of integrated ship energy system. In this paper, there are considered gas emissions from shipping, compared with other ways of transportation and on the basis of Engine Room Simulator ERS4000 are made an example for modeling and optimization of processes of energy producing and distribution. There are described some sources of gas emission and facilities to analyze possibilities to decrease of gas emissions and increasing of energy efficiency (technology-technical means for increasing energy efficiency with exploitation of ship energy system) and using different scenarios in education and examination of students, cadets and engine teams.
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  • MARINE DIESEL ENGINE ENERGY AND ECONOMICAL PARAMETERS DETERMINATION AFTER INDICATOR DIAGRAM DIGITAL PROCESSING

    MOSKOV Julian; ZARKO Iliev
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In this paper determination of a marine diesel engine indicative diagram, taken by mechanical indicator, problem is reviewed. On the basis of recognition of images and analysis of the resulting database energy economical parameters (EIP) are collected, which completeness and accuracy exceed those obtained by modern mean indication pressure (MIP) systems. The software used for processing and generating the database in Flash environment is also described.
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  • FPGA IMPLEMENTATIONS OF CONSTANT FALSE ALARM RATE DETECTORS (CFAR)

    MILANOV Peter; ALEXANDROV Chavdar
    4/1/2010
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    FPGA implementations of CFAR detectors in different scenarios and environments are described in this paper. Possible combinations with other modules to improve performance and functionality, implemented in different classes FPGA’s are discussed.
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  • A POINT OF VIEW ON THE REGASIFICATION OF LNG

    MEMET Feiza
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    LNG business started in the ‘60s and since then evolved quite fast. The high natural gas demand the existence of receiving terminals. The most significant function of a terminal is the LNG conversion through the vaporization process. In the last years, improvements of the LNG technology focused on the liquefaction process and shipping. This paper deals with the regasification of LNG, which traditionally is done by taking heat from the sea water. Is analysed how the integration of the cryogenic heat sink in the situation of a H2/O2 cycle affects the exergy efficiency.
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  • THERMODYNAMIC AND ECOLOGICAL ANALYSIS OF INTERNAL COMBUSTION ENGINES

    MEMET Feiza
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Ships are important air pollution sources since their high powered main engines often use heavy fuels. Internal combustion engines are widely used in the shipping sector. Shipping emissions cause significant effects on the environment. In this paper is made an analysis of the thermodynamic efficiency of the Otto Cycle. The eco analysis is made by introducing the efficiencies under maximum power conditions and maximum ecological conditions, and also the heats rejected to the environment under these conditions.
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  • MULTISTATIC SONAR PULSE SIGNALS TIME DELAY ESTIMATION

    KOLEV N. ZH.; IVANOV P. VL.; KALOYANCHEV P., ST.
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    An application of a multistatic sonar concept is presented. Signal excess areas were simulated for a given configuration of one active source and two passive receivers for different sonar, target and sound speed profile parameters. Time delay estimation algorithm based on convolution in frequency domain is developed. Experimental results are given with real sonar measurements and time delay estimation in test tank and at sea trial.
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  • DECK CADET AND “ON-LINE TRAINING” ON BOARD OF THE SHIP

    IORDANOAIA Florin
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper is addressed to the marine officers from the Navigation section and to the students from the final year of studying who are in the training voyage, before the final exams and before obtaining the maritime certificate. The progress from the IT domain, communications and the techniques of leading the maritime ships allows nowadays the reduction of the determination time of the astronomical point of the ship. Due to the fact that IMO through STCW imposes the unification of the training way of the marine officers, no matter the country they come from, in this paper I introduce a series of notations and international standards. On their basis it can be accomplished the training of the students and of the deck officers from different countries for the on-line determination of the astronomical point.
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  • CLASSIFICATION OF THE MARINE SIMULATOR EXERCISES (WORKING SCENARIOS)

    HINEV Valentin
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The exercises are classified on the basis of different quantitative and qualitative criteria. They provide information on the aims of exercise or which sphere or branch of the marine education it is designed for. Other criteria specify the number of the included objects as well as for the variables of the training environment and duration of the exercises. The classification of the exercises also takes into consideration the necessity of instructor-operators for operating the simulator sessions, the vessel traffic, special procedures in bridge management or the organization of the examination.
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  • MECHANICAL PACKING (AXIAL SEAL WITH SLIDDING RINGS) STUDY USING FINITE ELEMENT METHOD – WITH “ANSYS 9 - WORKBENCH” PROGRAM

    GRIGORESCU Lucian; ZIDARU Nicolae
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Using computer software “Solid Works” to generate the geometric form of the seal's rings and “ANSYS-9 WORKBENCH” program for the FEM analysisi to calculate mechanical stresses and thermal loandings of a mechanical seals as a part of the centrifugal pumps working in an oil refinery. The goal of this analysis is to improve the design of the seal.
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  • MATHEMATICAL PROPERTIES OF HYPERBOLIC CONSERVATION LAWS FOR SHALLOW WATERS

    GHERGHINA Aurel; VLADU Gabriel
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The purpose of this paper is to provide the reader with a presentation of some mathematical properties of hyperbolic conservation laws. We restrict our attention to those properties thought to be essential to the development and application of numerical methods for conservation laws.
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  • SHIP MANOEUVRING BY PMM - MATHEMATICS AND EXPERIMENTS PART I, PART II

    GANEA Bogdan
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The early 2000’s saw the revitalisation of the ship manoeuvring activity of the Ship Hydrodynamics Department of Icepronav. Mathematical modelling of the ship manoeuvring was approached on a new basis. The Abkowitz model, although classical, was found suitable for the available experimental gear - the planar motion mechanism (PMM), installed on the carriage of the main towing tank, length×beam×depth: 280×12×6m. Software for the experimental data processing and basic IMO manoeuvres simulation was written. Till mid 2008, this procedure was used for both contractual and research work.
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  • THE VELOCITY OF THE LOCK WATER LEVEL AT A LINEAR VARIATION OF THE FLOW IN THE FILLING (EMPTYING) CONDUIT

    DINU Dumitru; CUPSA Ovidiu Sorin
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper presents a mathematical model of the filling (emptying) of the lock chamber in a transition period, when the valves are opening or shutting. In this situation, we can consider a linear variation of the flow. We shall study the flow of the viscous fluid, no compressible, in an unsteady regime, through the lock camber filling (emptying) conduits with the help of the general equation of Navier-Stokes and the equation of continuity. To solve these equations we used the potential vector, which has a physical significance: the circulation of the potential vector on the perimeter of the conduit section is equal to the flow through this conduit. By approximation we established a hyperbolic variation of the velocity of the liquid level to an asymptote.
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  • DETERMINATION OF EXPLOITATION RESOURCES OF SUPPORTING GIRDER FROM RAILWAY

    DICHEV D.; TODOROV B. S.; DIMITROVA A. M.; LYUTSKANOV G. K
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The aim of present article is to determine the possibility of further exploitation of the supporting girders of an under-crane way in “Varna - West” port before pressing repair. For this purpose destructive mechanical and metalography testing of samples cuted from those girders were made.
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  • INTERNATIONAL STANDARDS OF MARITIME ENGLISH AS A MEANS TO IMPROVE SAFETY AT SEA

    DEMYDENKO N.
    4/1/2010
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This article gives background information about MarTEL Project and its achievements. The MarTEL Project is being developed by several European countries within the frameworks of European Union Leonardo da Vinci educational programme in order to establish international standards in Maritime English. In 2009 Ukraine – Kyiv State Maritime Academy, in particular, joined the project. Ukraine occupies the 5th place in the world in manpower for different ranks and classes of seafarers working on multi-national and multi-flagged vessels. The participation of the Ukrainian higher educational institution in this project is one indication that Ukraine is interested and involved with international co-operation in order to reduce merchant vessels incidents and accidents caused by the human factor relating to Maritime English communication failure on board ships and in ports.
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  • TRANSITORY PHENOMENONS INTO NAVAL ELECTRICAL EQUIPMENT

    DELIU Florentiu; BURLACU Paul
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The analysis is based on a naval power with synchronous generator and consumers of various powers. The paper presents a systemic approach to naval power systems based on mathematical models of specific generators and consumers.
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  • EXPLICIT DYNAMIC SIMULATION OF A SPACE DEBRIS PROJECTILE IMPACT OVER A SATELLITE STRUCTURE

    CALIMANESCU Ioan; GRIGORESCU Lucian
    4/1/2010
    8 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The purpose of this article is to investigate numerically the dynamic response of a satellite structure subjected to an impact with high velocity space debris. Satellites provide numerous services for modern society. They perform essential duties for military, governmental, and commercial organizations. The missions of these spacecraft include science ventures such as earth observation, interplanetary exploration, astronomy, and solar physics. They also include commercial endeavors such as television signal transmission, data transmission, and satellite telephone communication. In one of the currently considered designs of the satellite, its outer skin is planned to be constructed from two-ply composite material panels. Their structure may be subjected to impacts with space debris (mass 0.0014 kg). In the present work a transient non-linear-dynamics based analysis is carried out in order to predict the extent of damage of satellite panels during potential hypervelocity impact with space debris. The used simulation code was ANSYS/LS-DYNA, taking advantage of its explicit dynamics facilities and capability to model the impact phenomenon.
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  • EXPLICIT DYNAMIC SIMULATION OF A PIPE DEBRIS PROJECTILE IMPACT OVER A NUCLEAR HEAVY WATER STORAGE VESSEL

    CALIMANESCU Ioan; GRIGORESCU Lucian
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The purpose of this article is to numerically investigate the dynamic response of a heavy water nuclear storage vessel subjected to an impact with high speed debris (pipe fragment). The pipe fragment has a mass of 31 kg. There were employed 5 different simulation scenarios, where the projectile was supposed to have speeds from 10 to 50 m/sec. The used simulation code was ANSYS/LS-DYNA, taking advantage of its explicit dynamics facilities and capability to model a solid/fluid interface. The impact was studied for the vessel wall which was simulated involving Shell 163 type finite elements and also the effect of the fluid on response was considered, the vessel being considered filled with radioactive heavy water at atmospheric pressure.
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  • STRUCTURAL AND KINEMATIC VIBRATION ON INTERNAL COMBUSTION ENGINE - PART II

    BUZBUCHI Nicolae; STAN Liviu; MEMET Feiza
    4/1/2010
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    As presented in the title, the present paper is a sequel of the previous one, dedicated to the general study of the engine dynamic system. For this engine we developed a structural and kinematic model. The main purpose is now the study of the marine engine dynamic behaviour, including the system response, stress limits, the influence of one missfiring cylinder, system resonance and counteracting shafting torsional vibrations. The main conclusions have been presented in Part I
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  • STRUCTURAL AND KINEMATIC VIBRATION ON INTERNAL COMBUSTION ENGINE - PART I

    BUZBUCHI Nicolae; STAN Liviu; BERESCU Serban
    4/1/2010
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Computational methods to predict the vibration of an internal combustion engine have become more important as demands for matching the lighter weight with low vibration levels and for reducing the development period have been increasing. The former studies of engine vibration are categorized into two groups. One deals with structural vibration (elastic vibration) in relatively higher frequencies. The other deals with kinematic vibration (rigid body motion) in low frequencies. Recently, it is becoming more important to analyze structural and kinematic coupled vibration in middle range frequencies. In this study, we developed an engine vibration analysis system for a computer aided design software, which can comprehensively analyze structural and kinematic coupled vibration in a wide range. A new formulation using a local observer frame and eigenmodes was proposed to efficiently calculate the structural and kinematic coupled vibration of the moving elastic body. In addition, some types of force elements were developed to express the transmitting force from a body to another body or the boundary conditions. The developed program was applied to a real engine model and verified by experiment under running conditions
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  • A POTENTIAL APPLICATION OF ARC FAULT CIRCUIT INTERRUPTERS IN SHIP ELECTRIC SYSTEMS

    BOHOS Aprahamian; LYUBOMIR Dankov
    4/1/2010
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The arc-fault circuit interrupter (AFCI) is emerging as a new device in the US National Electrical Code (NEC) and in residential installations to enhance electrical safety. New technology generally fosters questions and concerns about the workings and application of the technology and this article will address some of the most frequently asked questions surrounding AFCI: • How does the AFCI work? and, • What is the state of the potential application of AFCIs in ship electric systems? This article addressees both questions.
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  • ENHANCED SIMULATION TECHNOLOGIES TO SUPPORT MARITIME OPERATIONAL RISK MANAGEMENT ONBOARD SHIPS

    BALDAUF Michael; JENS-UWE Schröder-Hinrichs; KNUD Benedict; MATTHIAS Kirchhoff; MICHAEL Gluch
    4/1/2010
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Approximately 90 per cent of global trade is realized via ships and seaways: a world without shipping is therefore unimaginable. Consequently, hazards and accidents in shipping have negative effects on the world-wide economy and have to be avoided by adequate safety related measures. As the United Nations specialised agency in the maritime field, the International Maritime Organisation (IMO) is responsible for improving maritime safety and preventing pollution from ships. One of the most important regulatory measures to achieve these aims is the International Safety Management Code. Additionally, based on IMO conventions and performance standards as i.a. for Integrated Navigation and Integrated Bridge Systems (INS/IBS), many new devices and sophisticated systems are these days installed onboard to support the bridge team and the pilot in handling a ship safely and in managing operational risks. However, accidents still occur and further improvement of risk management is needed. This paper deals with investigations into the application of simulation techniques to enhance onboard operational risk management. A concept for a real-time simulation-based tool using an innovative combination of mandatory technical and navigational equipment will be introduced, and a sample for applying such a module for the purpose of collision avoidance is described.
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