Items

  • A NEW TENDENCY IN EVALUATION THE SHIPS PASSAGE

    Chanev Belev BLAGOVEST
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Many years in the maritime navigation the main problem was determination and accuracy of ships position. Solving of this problem was with great priority in the methods of evaluating the passage. All theory of navigation and passage planning was built around opportuninies for the Officer of the Watch to determine the ships position on different stages of the passage.Today, in establishing the ships passage plan, the Officer of the Watch has another criterias for evaluating the stages of the passage. Today ships position determination is not a problem at all and the accuracy of the position is very high. Today the International Safety Management Code requires another priorities in the stage of ships passage planning- which are described in the paper.
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  • INFLUENCE OF THE TECHNOLOGICAL PARAMETERS ON THE DISTRIBUTION OF THE TEMPERATURE FIELD AND THE DEPTH OF THE HARDENED LAYER DURING THE INDUCTION HEATING OF THE INTERNAL CYLINDRICAL SURFACE OF SHIP STEEL BUSHINGS

    Bohos APRAHAMIAN; Maik STREBLAU; Dimitar STAVREV; Vladimir SHTARBAKOV
    4/1/2013
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The induction heating is widely used owing to the high quality performance, versatility and precise control means of the heating process. Hardening of internal cylindrical surfaces of ferromagnetic details and achieving preset depth of the hardened layer requires the provision of certain speed of heating and cooling, determinate surface temperature and distribution in depth. The purpose of this paper is to present a concrete solution for the shape of the inductor, heating the internal surface of a cylindrical detail, such as ship bushing, and simulation of the processes occurring in the system inductor-detail to study the influence of the process parameters on the depth of the hardened layer.
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  • SIMULATION BASED TRAINING ON MARITIME EDUCATION AND APPLICATION ON ICE NAVIGATION MODULE

    Ali̇ Cemal TÖZ; Burak KÖSEOĞLU
    10/1/2012
    4 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    From the shipping industry’s point of view cold winters mean nothing else than trouble. Navigation in Arctic waters is unique compared to all other ship operations. Significant changes in climate and their impacts are visible regionally and are expected to become more pronounced in the next decades. Trade in ice covered waters continues to grow and increasingly, operators looking for future flexibility are building ships classed for operations in ice. In the future the Northwest Passage and Northern Sea Route are likely to provide alternative shipping lines for international trade. Ice navigation is probably the most difficult and challenging mode of navigation possible. Few other areas of maritime operation are exposing the ship and its crew for more dangerous situations. The use of ship-bridge simulators is becoming an accepted method of training in the maritime education. Many simulator-based training courses were developed ad hoc, often designed to individual requirements of a shipping company or training establishment. For ice navigation module, the goal of training module is to reduce the risks of winter navigation and to ensure safe operations even in severe ice conditions. This article aims to analyze effectiveness of maritime simulation systems on strengthening the maritime training for ice navigation module in Dokuz Eylül University Maritime Faculty.
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  • THE ACADEMICIAN PROFILES OF MARITIME HIGHER EDUCATION INSTITUTIONS IN TURKEY*

    Nas SELCUK ; Celik BURCU
    10/1/2012
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    One of the most important missions of maritime educational institutions is to educate the qualified labor force meeting the international maritime manpower market needs. For that purpose in Turkey, the number of educational institutions providing manpower to the maritime industry has been rapidly increased in the last decade. Concordantly, there have been a lot of investments in laboratories, classrooms and simulators in order to enable sufficient training. Despite of all these aforesaid developments, the most important issue, instructor or academicians with maritime background, was neglected. Now, Academicians have become the most important human capital. This capital cannot be created immediately yet it can be brought into existence within a long period of time. Without this capital is not possible to train qualified seafarers, to survive in the maritime industry. The aim of this study is to determine the profiles of the maritime higher education institutions in Turkey, their capacities and profiles of the academicians with maritime background employed in such institutions. During the study, structured interview questions have been used. Data collected was obtained through official sources. Maritime higher education institutions providing education at the undergraduate level with fulltime employed academicians (with maritime background) have been evaluated via the data obtained using the methods of statistical analysis.
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  • THE STUDY OF WAVES ENERGY CAPTURE PROCESS BY MECHANICAL AND ELECTRICAL ANALOGY

    Tudor SAJIN; Dragoș-Iulian NEDELCU
    10/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Starting from the concept of an device for waves energy conversion, constituted by floating cylinder structure, the paper intends to carry out a comparative analysis between mechanical and electrical analogy, for a more precisely determination of parameters that have a influence on oscillating system for waves energy capture.
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  • EFFICIENCY ANALISYS OF WAVES ENERGY CONVERSION SYSTEM WITH FLOATING CYLINDERS

    Dragoș-Iulian NEDELCU; Tudor SAJIN
    10/1/2012
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Starting from the particularities of offshore surface waves, the paper propose the analysis of a new system with floating bodies articulated, connect between them with levers, designed for potential waves energy and for its conversion. From the analysis of technical stage was chosen the cylindrical shape for which the waves energy absorption efficiency is higher than in a vertical plate case. It was established that the efficiency of capture system with floating cylinders in function by their diameters and by the ratio of lever length connection at wavelength of wave.
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  • TRENDS AND PERSPECTIVES ON THE EFFICIENCY ROMANIAN PORTS

    Cristina-Steliana MIHAILOVICI
    10/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This article discusses predictions on the ports efficiency in the actual Romanian ports, in the short and medium term. We are looking for answering some questions related to measures leading to development of the Romanian Ports and their management.
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  • A PERFORMANCE IMPROVING OF A TYPICAL TRANSCRITICAL CO2 REFRIGERATION CYCLE

    Feiza MEMET
    10/1/2012
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Together with the care for our environment, the natural refrigerant CO2 is seen as an attractive solution due to its excellent advantages in refrigeration application. In some cases transcritical vapor compression cycles are used instead of the conventional vapor compression cycles (air conditioning). Transcritical CO2 refrigeration cycles present low efficiencies because of losses encountered during expansion processes. In this paper, an ejector expansion transcritical CO2 refrigeration cycle is used to improve the performance of a typical transcritical CO2 cycle since a constant pressure mixing zone ejector is used instead of the expansion device from the basic transcritical CO2 refrigeration cycle.
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  • THE CALCULATION OF THE RESISTANCE OF A FIBER REINFORCED COMPOSITE

    Ramona DUMITRACHE; Mihael CHIRCOR; Cosmin-Laurențiu DUMITRACHE
    10/1/2012
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The resistance of laminated materials can be either measured or calculated. The comparison between the two approaches points out that the second method is preferable if its results are good enough. The present essay describes an algorithm and a program designed to calculate the resistance of the unidirectional laminates.
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  • ENGLISH FOR MARINE ENGINEERS: SELECTION OF MATERIALS FOR THE LANGUAGE CLASSROOM ACTIVITIES

    Nadiya DEMYDENKO
    10/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The paper presents a sample of new teaching/learning materials for the language classroom activities of Marine Engineers in connection with the work on the project purposing to create the study pack for Maritime students beginning their academic career in Kyiv State Maritime Academy. The project is based on the concept of ‘early specialization’ which implies that the 1st and 2nd year students are taught both General English and Maritime English. This approach requires new teaching/learning materials (Student’s Book, Workbook, Teacher’s Book, Dictionary of Maritime Terms and others) to satisfy the needs of students in authentic communicative language resources.
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  • ANALYSIS OF THE CRACK LENGTH AND TEMPERATURE OF A CANNON BARREL USING THE J INTEGRAL

    Ioan CALIMANESCU; Liviu-Constantin STAN
    10/1/2012
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Perhaps the most accurate and elegant method for computing the energy release rate is to calculated the J integral by converting the line integral into a domain integral which can easily be calculated using the known finite element shape functions. The problem illustrates the case of a crack in a cannon barrel, together with the relevant geometry against crack length defined from the bore of the cannon. This crack geometry is the most dangerous integrity case for the cannon barrel. In this research, 155 mm cannon barrel with one crack with lengths of 4 mm, 8 mm and 12 mm on inner surface is firstly structurally analyzed at room temperature, and subsequently coupled thermo-structurally analyzed considering 4 scenarios, where the crack length was deemed to be 4 mm, the temperature of the inner surface was 1000C, 1250C, 1500C, 2000C. The numeric model presented in this paper, provides consistent and reasonable results for the dependency of stress intensity factor to the crack length and temperature of a cannon barrel using the J integral. The temperature fields inside the cannon barrel (and, generalizing, inside any circular structure with thick walls) tends to ameliorate the stress fields existing on the crack tip and pushing the calculated KI downward and thus improving the crack behavior.
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  • OPTIMIZATION OF A METAL MATRIX COMPOSITE HYPERSONIC MISSILE AERODYNAMIC SHAPE AND STRUCTURE BASED ON THE ADVANCED TECHNIQUES

    Ioan CALIMANESCU; Liviu-Constantin STAN
    10/1/2012
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Applied aerodynamics has, historically, involved a very strong mix of theory and experiment. This is partly because experiments can be very costly and computations are rarely sufficiently sophisticated. This will continue to be the case. Computational Fluid Dynamics (CFD) is playing an ever increasing role in aerodynamic design for advanced missiles either for performance improvement of the existing system for new missions or for new concept development for future missions. A cost effective design process is to judiciously combine the wind tunnel tests and CFD studies that exploit the inherent strengths of each of these. Hypersonic missile flight is characterized by a high flight Mach number (usually greater than 5), thin shock layers and high viscous loads. The missile aerodynamic geometry has high impact on different missile systems such as control, propulsion, structure, and warhead. The objective of the current paper is to present a reliable Finite Element Analysis/CFD and Fluid Structure Interaction (FSI) advanced technique for obtaining hypersonic missile aerodynamics and use this technique for finding optimal hypersonic missile shape based on best structural behavior (the lowest von Mises stress will play the role of Objective Variable), and, secondly, based on the best aerodynamic behavior (the highest V∞ fluid velocity will play the role of Objective Variable).
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  • RADAR IMAGE DESCRIPTION USING TIME SERIES AND HIGH ORDER SPECTRAL MOMENTS APPROACH

    Doynov BOZHIDAR; Popov ZACHARY; Alexavdrov CHAVDAR
    10/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper describes an attempt for modeling and estimation of a target under radar observation. High order spectral moments and time series are applied. Experiment with real target is conducted and autoregressive model is used to describe the target.
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  • MODELING AND ANALYSIS OF A RECONSTRUCTION OF SHIP SEARCHLIGHT USING LED MATRIX

    Bohos APRAHAMIAN ; Borislav DIMITROV ; Lyubomir DANKOV
    10/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The searchlights of the ships and the lifeboats are designed to help in the rapid identification of people fallen overboard and to communicate with other ships and shore. To safely perform these functions, they need to be powered from independent sources, and their capacity is determined by SOLAS (International Convention for the Safety of Life at Sea), according to the required duration of illumination. Although light communication is shifting from various forms of radio communication, it is still indispensable element of navigation equipment of each vessel. New LED light sources provide high brightness, high efficiency (the ratio of light to electricity usage) and responsiveness (the transition from off in a state of maximum brightness). This allows for the construction of relatively small-sized searchlights with multiple parameters exceeding the requirements of SOLAS.
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  • THE ENVIRONMENTAL IMPACTS OF EMMISIONS GENERATED BY ROUTINE OPERATION ON PORTS

    ABDUL CHALID; ABD SAMAN BIN AB KADER; AHMAD KHAIRI BIN ABD WAHAB; MUHAMAD HANIS
    10/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The expansion of international trade arising from globalization has led to a substantial increase in goods transshipment between ports. This has led to increased emissions from ships in ports, and trucks traveling to and from ports. Increment of ship traffics and machineries could be a source of gaseous emissions and particulate pollutants. This study attempt to investigate the problems in Johor Port. Emission sources concentration of sulphur dioxide (SO2), nitrogen dioxide (NO2), carbon oxides (CO, CO2) and particulate matter less than 10 µm (PM10) in port were obtained. From the results obtained based on the comparison with Recommended Malaysian Air Quality Guidelines (RMAQG), NO2 concentration surprisingly exceed the limit by 5.9 percent in sampling station 2 while highest SO2 concentration were detected in sampling station 1 and 3 with a value of 0.2 ppm exceeding the RMAQG limits of 0.13 ppm by 53.8 percent for both stations. Other gaseous at station 1, 2 and 3 are still within the recommended guidelines. Based on the computation of Ocean-Going Vessels (OGVs) emissions estimate and later compiled as inventory, the results clearly shows that major pollutants contributor in Johor Port are oxides of nitrogen (NOx) and sulphur dioxide (SO2) with a percentage value of 60 and 27 percent for maneuvering mode while 60 and 28 percent for berthing mode. Other pollutants contribute below than 10 percent for both modes.
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  • CORROSION BEHAVIOR OF ALUMINIUM ALLOY IN SEAWATER AT TWO DIFFERENT SITES OF KUALA TERENGGANU COASTAL AREA

    WAN NIK W.B.; AFANDA G. I; ZULKIFLI F.
    4/1/2012
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    An investigation on the corrosion behavior of aluminum at different sites of sea water in Kuala Terengganu was investigated. The method of corrosion assessment was by the use of potentiodynamic polarization scan (PP) and weight loss test. Aluminum alloy 1508 was employed in this study. This metal was immersed in seawater at different sites of Kuala Terengganu coastal area with different distance from the shore. Results obtained from electrochemical test techniques shown that lower corrosion effect of the metal significantly reduced the corrosion densities (icorr) and corrosion rate. The solution of seawater affects the corrosion rate according to their chemical and physical behavior of the sea water parameter
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  • RECREATIONAL BOAT LICENSING, LACK OF UNIFORMITY IN THE EUROPEAN UNION

    Gavilán Jordi TORRALBO; Sanabra Marcel·la CASTELLS
    4/1/2012
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Many European countries require the skipper of a pleasure craft to be able to provide evidence of his competence. The pleasure craft operator card or boating license permits people operate a pleasure craft. One of the requirements of this license is intended to decrease the number of boat accidents. This paper analysis the regulation of different European Union countries related on recreational boat licensing and states that there is no uniformity at European level in terms of the requirements for sailing in pleasure boats. Thus, licenses that allow navigation in pleasure boats, the theoretical and practical as well as the requirements for obtaining the qualification and training of future skipper, essential for ensuring the safety of these boats are different depending on the member state of the European Union that we are talking about. The paper is divided into following sections: Section 1 describes a brief introduction; Section 2 provides the state of art and current Spanish regulation; Section 3 analysis different European countries regulation; Section 4 proposes the need of an European certificate and finally, Section 5 remarks some conclusions and further research.
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  • NON-ISOTHERMAL MODEL OF LINEAR RESISTANCE IN PIPELINES PART IІ. EXPERIMENT

    Tomov PEICHO; Gyurova LYUBA
    4/1/2012
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The article presents and discusses results obtained from an experimental examination of the general and linear resistances of a pipeline. The impact of the fluid temperature over the friction losses is examined. Satisfactory similarity is encountered by comparing numerical and experimental results. The possibility of head losses optimization by means of temperature change is confirmed.
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  • NON-ISOTHERMAL MODEL OF LINEAR RESISTANCE IN PIPELINES PART I. THEORETICAL RESEARCH

    TOMOV Peicho ; GYUROVA Lyuba
    4/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The article presents and discusses results obtained from a non-isothermal research and modeling of hydraulic linear pipeline resistance. Main objective of the work is to determine the linear resistance coefficients for pipelines of circular cross-section. The effect of the temperature variation is taken into account by the change in the viscosity value of the working fluid (hydraulic oil). The issue of thermal optimization of the flow regime is discussed as a way to reduce the head losses in the pipeline.
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  • MARITIME EDUCATION AND TRAINING QUALITY (METQUAL); AN APPLICATION ON DOKUZ EYLUL UNIVERSITY MARITIME FACULTY

    Nas SELCUK; KoseoğLu BURAK
    4/1/2012
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The concept of quality and satisfaction related to education services have been discussed enthusiastically in last 30 years. Nowadays, almost all societies and organizations have established their own ISO 9001 – 2000 quality system with a certain accreditation association. Quality standards in maritime education have been exposed with International Convention of STCW 78/95. In quality systems to improve services and expand activities feedbacks and user’s satisfaction should be taken from users of these services. Dokuz Eylul University Maritime Faculty is taking many feedbacks from graduated students. The first version of the instrument used in this paper was developed and adopted from education service quality instrument by NAS (2000). The last version of the instrument, called as “METQUAL”, was developed considering MET needs and “Accreditation Board for Engineering and Technology”. The validity and reliability of “METQUAL” was found satisfying in the pilot studies. In this study, the quality of the education and training service in Maritime Faculty (MF) of Dokuz Eylul University (DEU), Marine Transportation Engineering Department (MTED) is evaluated with the instrument of “Maritime Education and Training Quality” by the graduates from between 1999-2008. At the end of research, the results of faculty’s service quality are presented according to graduates perception of service quality and the activities are explained, which should be done to develop and improve service quality of the faculty.
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  • SIMULATION OF COMBUSTION PROCESS OF A DIESEL ENGINE FUELLED WITH BIOFUELS

    Adrian SABAU; Mihaela BARHALESCU; Constantin DUMITRACHE
    4/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    A thermodinamic model has been used to investigate the combustion performance of a four cylinder direct injection diesel engine fueled by biofuels The numerical simulation was performed at constant speed. The indicated pressure, temperature diagrams are plotted and compared for different fuels. The emissions of soot and nitrous oxide are computed with phenomenological models. The experimental work was also carried out with biodiesel diesel blends, to validate simulation results with experimental results, and observed that the present model is successful in predicting the engine performance with biofuels.
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  • FUZZY LOGIC METHODS USED IN MARITIME CONTAINER TERMINALS

    Gabriel RAICU; Alexandra RAICU
    4/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The goal of this paper is to present the results in the development of a methodology to integrate simulation, forecasting and planning to support day by day and long term decisions for operators working in intermodal container terminals. Congestion and increasing cargo dwell times is a common scene in many of the world’s ports. Government authorities such as customs and health may delay containers from reaching their destinations due to inspections. Shipping lines are unconcerned if there is a poor terminal productivity, as long as their vessel sails on time.
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  • THE ADVANTAGES OF THE COMPOSITE MATERIALS USED IN SHIPBUILDING AND MARINE STRUCTURE

    Alexandra RAICU
    4/1/2012
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper presents the advantages of using the composite materials in shipbuilding and marine structure. The volume and number of applications of composite materials have grown steadily, penetrating and conquering also the marine industry. Modern composite materials constitute a significant proportion of the engineered materials market ranging from everyday products to sophisticated applications.
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  • THE INFLUENCE OF TUNGSTEN INERT GAS WELDING CURRENT ON MECHANICAL PROPERTIES OF AA5083 JOINTS

    MOHD NOOR C.W.; SAMO K.B.; MUSA M.A
    4/1/2012
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The aluminium and its alloys are widely used in marine applications such as ship hull and its components due to its lightweight and corrosion resistance. The aluminium alloys require special tool and skill to weld due to high thermal conductivity. A research vessel “RV Discovery” is currently being constructed exclusively using 5083-aluminium alloy for University Malaysia Terengganu and the welding properties were investigated. The aluminium welded joint specimens were prepared using the Tungsten Inert Gas (TIG) welding process by certified welders at different current settings. The mechanical characteristics of the welded alloys were carried out for tensile, impact and hardness tests. Further, metallographic examination was conducted to identify and observe the various fusion zones. The results of these tests are presented in this paper. This study revealed that, the different welding current settings in which specimens were prepared remarkably affect the mechanical properties of 5083-aluminium alloy joints.
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  • THE IMPACT OF THE GLOBAL CRISIS ON THE MARITIME TRANSPORT IN UE

    Cristina-Steliana MIHAILOVICI
    4/1/2012
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    That through a period of global economic crisis is a topic on the agenda, but we have to analyze what impact it has on shipping and what measures we take to maintain or why not develop maritime activity in this period. The structural changes that occur in international trade and maritime development have a direct impact on growth and expansion port.
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