Items

  • THE IMPACT OF THE PHENOMENON COVID-19 ON THE MENTAL HEALTH OF SEAFARERS

    Alina-Lucia BOSTINA
    4/1/2023
    10.53464/JMTE.01.2023.02
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper aims to highlight the devastating impact of the imposed restrictions during the COVID-19 Pandemic towards the mental health of the sailing crew. It is well known that the employees in the navy domain were already accustomed to distinct working conditions, depriving themselves of factors that are vital for a balanced, functional state of mental health. The seamen are subjected to solitude, uncertain and unpredictable weather, a constant fear of danger and the anxiety of being prepared to ensure their own safety at any time needed. This paper aims to highlight the devastating impact of the imposed restrictions during the COVID-19 Pandemic towards the mental health of the sailing crew. Isolation, research shows, has an impact on both mental and physical health, from reducing the ability to manage stressful situations, to difficulties in making decisions, memorizing and processing information to the onset of depression, anxiety, attacks of panic and increasing the risk of illness, because the immune system of a person responds differently in the fight against viruses. In this paper were presented the procedures that the crew members of the ships that made voyages in the areas where the imposed restrictions were among the toughest to follow. Also, the mental state of the crew during the voyage and after arrival were analyzed, from in terms of the staff's statements but also individually.
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  • THE ROLE OF CAREER COUNSELORS IN VOCATIONAL EDUCATION

    Nicoleta ACOMI; Ovidiu ACOMI; Roxana IANCU
    4/1/2023
    10.53464/JMTE.01.2023.01
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Passing from school to the labour market requires support, advice, and guidance. The rapid advancement of technology in the maritime industry, the wide range of duties, and ever-changing job placement from ashore to remote sites or on board vessels, put many treats on the future employees. This article describes how career counselling is integrated into the process of supporting VET learners in making decisions about future careers in three European countries and how this process is perceived by learners. The research comprised a literature review to reveal the approach with regard to career counselling and analysis of data collected with a survey questionnaire. The 88 responses emphasized learners' views regarding the career counsellor’s actual role and provided an understanding of their expectations for making the transition toward the labour market. The questions addressed groups of people that decided to continue their studies and get a job and those undecided. Participants explained the motivator factors for making the career choice, the main sources of career information, and their expectations from the future job. This article explores the extent to which the professionals and counsellors would contribute to making the decisions and the types of interaction that are expected to produce positive results and engagement. The results indicate that teachers and parents are currently contributing to making the final career decision. Even though, the input of professionals is highly expected by all groups of participants. Respondents emphasized that challenges, dynamism in the workplace as well as the variety of tasks are those factors that would make them stay in a job. The authors concluded that to be effective, the career counselling of young learners needs to be enriched with jobspecific insights provided by professionals. The research conclusions draw up the VET learners' main expectations that can be used to guide further career counselling activities.
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  • MARINE ECOSYSTEMS ASSESSMENT AND CLIMATE CHANGE

    Florentina-Aurelia VASILICĂ; Mariana PANAITESCU; Fănel-Viorel PANAITESCU
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.10
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In this paper there are analyzed ecosystem status characteristics, pressures and impacts, risk matrix for a marine ecosystem . The methodology is a new tool for assessing the state of the environment [1], [2]. The results are descriptive indicators of the analyzed ecosystems, wich were calculated by classical methods and computer applications [3], [4], [5], [6], [7]. Using information about these descriptive indicators, the ecological status of the marine ecosystem was assessed, calculating the risk matrix [5], [6]. Finally, it can observed that in the marine environment, the reconfigurations will have a tailor-made impact. The most affected will be the Black Sea fauna.
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  • SOME ASPECTS REGARDING THE OPTIMIZATION OF THE WIND TURBINE’S VIBRATION SYSTEMS

    Alexandru-Andrei SCUPI; Paula-Gabriela PANAIT; Mariana PANAITESCU; Fanel-Viorel PANAITESCU ; Mihael CHIRCOR
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.09
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The development of monitoring of vibration’s system of wind turbines is an important stage for operational details. In order to highlight the innovations made in these systems, their structural elements must be analysed (characteristics and classification of sensors, monitoring and analysis of structure, conditions for monitoring program). In order to measure vibrations in wind turbines, a correct and continuous monitoring of the functional state of each element in the structure is necessary. In this paper are presented investigations for wind turbines from wind farm Mireasa, South-East region of Romania, to determine the conditions of the drivetrain and highlight any potential developed problems.
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  • FRACTALS. ORIGINS AND HISTORY

    Cătălin Silviu NUTU; Tiberiu AXINTE
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.08
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Fractal shapes can be found everywhere around us in Nature, at small scale microscopic level, at normal scale observable with the naked human eye, but also at very large scale level, when looking at very far distant galaxies. As it will be presented in this paper, there is an inherent relationship between fractal structures in Nature and the harmony perceived by human eye in the structures of Nature. Although not explicitly formulated until late XII century by Fibonacci, the very same Golden Proportion had been already approached by the ancient Greeks. This Divine Proportion which can be found around us in Nature, represents the base for the latter concept of fractal and is also the link between early mathematics and advanced fractal mathematics. Some of the first ideas about harmony and proportions are dating back in Antiquity and they were promoted by the ancient Greeks in their philosophical schools, by scholars like Euclid, Thales and Pitagora. Although the concept of fractal it is a rather young one, being introduced by Mandelbrot in the ‘70s of the XX th century, the origins of the concept of fractal seem to be found, much earlier, in the aforementioned philosophical schools. In their philosophical schools, the antics, as far as we know, beginning with the Greeks, had discovered and used the concepts of proportion and harmony, in certain proportions they worked with. One such proportion is represented by the Golden Ratio.
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  • ANALYZING A BLACK SEA NAVAL ACCIDENT THROUGH THE STAMP METHOD

    Valerian NOVAC; Eugen-Victor-Cristian
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.07
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The article presents an in-depth analysis of the most significant accident ever in Constanta harbour using a method that goes beyond the chain of events that trigger an accident. In the introductory part, the authors present the features of the Black Sea basin, highlighting the eventual dangers to the ship's safety. Then the work presents the Systems Theoretic Accident Model and Process - STAMP method in brief; after that follows the modelling and analysis of the accident of You Xiu ship, and the scoop culminates with some short concluding remarks. The article serves as a base for further developments in accident analysis and an awareness instrument for scholars and practitioners regarding the general safety culture when operating a ship. Nevertheless, the work in this regard requires further research, and a comparative study using different methods and approaches should add more value to the actual efforts of the authors.
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  • MARITIME ACCIDENTS IMPACT ON MARINE ENVIRONMENT. A CASE STUDY OF THE ROMANIAN COAST OF THE BLACK SEA

    Laura NEDELCU; Eugen RUSU
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.06
    6 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The safety of maritime transport in the vicinity of the coast or in the seaport area requires special attention due to its damaging effects on the marine environment. Disruption of underwater food chains, emissions of harmful gases, underwater noise, oil or oil products spillage, alteration of hydrographic conditions, and waste disposal are some of the main effects of maritime transport. The shipping pollution on the environment include 4 types: air, water, acoustic and oil spills, having disastrous consequences not only on the environment but also on the economic and social side. Increasing awareness of the impact of marine pollution has led to a decrease in the frequency of spills as well as a significant decrease in the amount of oil spilled. The main purpose of this research is to analyse and determine the maritime accidents impact on the marine environment.
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  • METHODOLOGY FOR ENERGY EFFICIENCY IMPROVEMENT OF SHIP MOTOR DRIVEN SYSTEMS

    Elena KATELIEVA
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.05
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The methodology proposed in this paper identifies the main steps that can be taken for energy efficiency improvement of ship motor driven systems. It is necessary to follow the principles of systematic approach, taking into account the efficiency of each element and the system as a whole. We need to collect baseline data, to make assessment of the system performance and choose the most appropriate optimization measures. The proposed approach shows the main activities and technologies that could optimize the overall energy efficiency of the system. Ship motor driven systems are one of the largest consumers of electricity on the ship and improving their efficiency will reduce energy consumption and emissions from ships.
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  • ASSESSMENT OF THE SOLAR ENERGY POTENTIAL IN THE ROMANIAN NEARSHORE

    Michael FRATITA; Florin POPESCU; Eugen RUSU
    10/1/2022
    DOI:10.53464/JMTE.02.2022.04
    3 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In December 2019, the first official European Green Deal document was released, which aims to reduce greenhouse gas emissions gradually by 2050, when the carbon neutrality target should be reached. The aim of the paper is to analyse the possibility of implementing solar farms in Romania with particular interest for the nearshore area of the Black Sea. Moreover, it is analysed the current status of electricity generation sources in Romania, the profile of consumers connected to the National Energy System (NES), and the electricity injected into the grid through solar farms. On the other hand, the possibility of intermittent injection of energy into the grid and the effects on the stability of the national energy system are analysed.
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  • WASTE RECOVERY SYSTEM ECONOMICAL ANALYSIS FOR DUAL FUEL ENGINE FITTED ON BOARD A LNG TANKER

    Cătălin FAITĂR; Eugen-Victor-Cristian RUSU; Nicolae BUZBUCHI; Liviu-Constantin STAN; Cosmin-Laurenţiu DUMITRACHE
    10/1/2022
    DOI:10.53464/JMTE.02.2022.03
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The study aіms to address іssues related to the constructіon of shіps specіalіzіng іn the transport of lіquefіed natural gas or oіl tankers. Thіs type of shіp has had and stіll has a dynamіc іn іts operatіon, and іt іs more and more іntense, due to the growіng energy needs especіally іn the hіghly developed economіes of the world. The number of transportable LNGs currently exceedіng a loadіng capacіty of 100,000 m3 has already exceeded the 300 thresholds. From the fіrst shіp destіned for the transport of lіquefіed natural gas, Methane Pіoneer, of 4500 m3, thіs sector has been permanently subjected to new challenges and technologіes. The sіze of the shіps has grown contіnuously, wіth tanks exceedіng 200,000 m3 beіng buіlt іn recent years, such as Qatar Gas Q-flex shіps wіth a transport capacіty of 265000 m3.
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  • OCEANOGRAPHIC ENVIRONMENTAL ASSESSMENT USING UNDERWATER GLIDERS

    LaurențIu-Florin CONSTANTINOIU; Luis QUARESMA; Eugen RUSU
    10/1/2022
    DOI: 10.53464/JMTE.02.2022.02
    5 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    REP(MUS) 21 is an annual exercise jointly organised by the Portuguese Navy, the University of Porto, NATO’s Centre for Maritime Research and Experimentation (CMRE) and the NATO Maritime Unmanned Systems Initiative. The exercise gives Allies and NATO partners a chance to field and evaluate new maritime technologies. A Rapid Environmental Assessment warfare group was formed using Maritime Unmanned Systems to perform an environmental assessment of this area, by collecting data from the upper ocean region (0- 200 m.), sea surface, littoral shallow waters, and river estuary. Underwater Gliders were used in the REPMUS21 exercise, brought by several partners, to conduct environmental observations from the underwater domain of the exercise’s Joint Operations Area (JOA). This paper focuses on the use of SeaExplorer underwater gliders to collect oceanographic data during the exercise, and the operational impact of using this knowledge to compile the Recognized Environmental Picture of the exercise area.
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  • FUTURE DEVELOPMENTS ON CONTAINER SHIP DESIGN

    Milis Nilgun CALIBULA; Constantin MILITARU
    10/1/2022
    DOI:10.53464/JMTE.02.2022.01
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In this paper shows analysis on container ship design. Today, containers on vessel contain a wide range of different goods from consumer goods as shoes and electronic devices to chemicalsand other raw materials. Nevertheless, a container vessel is a cargo ship that carries all of its load in truck-size intermodal containers, in a technique called containerization. This article briefly discusses the scheduling of current conbtainer ship. Threfore, the manuscript major are: design of cargo ship, analyzed two model from vessel, types of container ships, etc. The design of a cargo ship was done with the NX software from Siemens. Finally, the recent trends in container vessel programming and the shortcomings of existing models are discussed.
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  • ASSESSMENT OF THE PERFORMANCE A VAPOUR COMPORESSION. REFRIGERATION CYCLE WORKING WITH AMMONIA

    Ionela TICU; Elena GOGU
    DOI: 10.53464/JMTE.
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper is a part of the efforts done in order to analyse the performance of vapour compression refrigeration cycles. These technologies are used with a high rate in marine refrigeration and are responsible for important amounts of energy consumptions. The obtained results are indicating the fact that the performance of the cycle is decreased when increasing the condensation temperature and keeping constant the evaporation temperature. Gains in the performance are obtained when degrees of superheating and sub cooling are increased, resulting that the cycle with superheating and sub cooling is superior to the one without these two processes. Ammonia or (R717) is a refrigerant often used on board the ships due to its very good thermodynamic properties. Moreover, the concern regarding the environment and the fact that ammonia is a natural refrigerant, offers to this refrigerant the chance to be adopted in the future plants, on board of new ships. The performance of an ammonia based cycle is discussed in terms of coefficient of performance (COP) and exergy efficiency, the theory of the first and second laws of thermodynamics being fundamental.
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  • PRODUCIBILITY OF FUNCTIONALLY GRADED AlB2/Al COMPOSITE MATERIAL

    ÖMer SAVAŞ ; Canberk KARATAŞ
    4/1/2022
    DOI: 10.53464/JMTE
    21 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This study is intended to investigate producibility of functionally graded AlB2/Al composites which are used in the manufacture of ship machinery parts. AlB2 particles have been spontaneously formed in liquid matrix as reinforcement. A semi-solid composite (Al(l) - AlB2(s)) prepared at 850°C was solidified under a centrifugal force to grade functionally. The properties of composite materials such as hardness and microstructure have been examined. This research provided the following findings, AlB2 particles can be successfully synthesized with in situ reaction technique in molten aluminum. It was determined that the hardness value of the composites increases with increasing AlB2 reinforcement content within matrix. Functionally graded AlB2/Al composite materials can be successfully produced with centrifugal casting technique. It is also determined that AlB2 reinforcement ratio of the composite materials ranged from 0 to 7 vol. %. In addition, it was observed that the hardness values of the composites increased with the addition of reinforcement ratio.
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  • NUMERICAL ANALYSIS OF THE BEHAVIOR OF PRESSURE VESSEL SUBJECT TO VARIABLE REQUESTS USING THE FINITE ELEMENT METHOD

    Mihalache Adrian CONSTANTIN; Alin DINITA; Valeriu-Nicolaie PANAITESCU
    4/1/2022
    DOI: 10.53464/JMTE.
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    The behaviour of a metallic material subjected to the action of a variable stress (which generates mechanical stresses in the material with variable intensities over time) differs significantly from that corresponding to the action of constant or monotonically increasing stresses which do not change in intensity over time or which increase continuously in intensity as time passes), its rupture may occur even if the intensity of the mechanical stresses generated during the stress σ is less than the tensile strength of the material Rm. The article studied the static and dynamic behaviour (fatigue) of an equipment consisting of a jacket and two semi-helical lids.
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  • ONLINE THERMODYNAMICS EDUCATION UNDER PANDEMIC TIMES, IN CONSTANTA MARITIME UNIVERSITY

    Feiza MEMET; Mirela-Iuliana SUNDRI
    4/1/2022
    DOI: 10.53464/JMTE.
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    As well known, the day of 11 March 2020 will remain in the history as the day in which The World Health Organization (WHO) has declared COVID-19 a pandemic. Under these circumstances, the international higher education was forced to remove the campus activities in online. Constanta Maritime University is one of the universities across the world which moved the educational process from face- to- face to online learning. This was a challenging task for the academic, managing and technical administration and for the students, as well. This paper focuses on the disciplined entitled Thermodynamics 1, encountered in the curricula of the Electromechanics Faculty, Constanta Maritime University. The paper describes the steps done during the online education along the semester, both by students and lecturers. At the end of the semester, students and lecturers had to face another challenge: the online examination. Since in the new conditions, the students had to gain the same knowledge as during the classic educational process, we are providing the results obtained by our students. Their exam was scheduled on June 26, 2020. The number of students attending the online examination was 108. The online report for the examination, available on the online platform of the university, indicates that online 17 students were not able to pass the examination (grade 5). The same chart data shows that 19 students have obtained grades in the range (8,00- 8,50), while 2 students obtained grades in the range (9, 50- 10,00). These results are considered to be encouraging for lecturers and students. This type of examination it is seen as a potential long term examination manner, given its benefits: online generation of the test, online verification and not last, transparency.
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  • ACOUSTIC SIGNAL ANALYSIS AND CLASSIFICATION BASED ON NEURAL NETWORK ALGORITHMS

    Said JAMAL; Yahya BENREMDANE; Yahya BENREMDANE; Jawad LAKZIZ; Said OUASKIT
    4/1/2022
    DOI: 10.53464/JMTE.
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper presents the results of an innovative approach in the underwater domain of research related to the identification, classification and recognition of maritime targets using acoustic data processed. The “Acoustic Signature” is specific to each target type; it is usually produced by the vibration of the propulsion system of surface vessels caused by their radiation into the water. Therefore, the processing of the frequencies generated by these vibrations is essential for the analysis and the classification of different target type. The purpose of this study is to build an alternative method to identify and classify targets with passive sonars using the TPWS (Two - Pass Split - Windows) filter. In this process, the signal generated by the target is processed in time frequency domain. Then a TPSW algorithm is applied in the frequency domain to reduce the background noise and enhance the frequency lines of the target noise. Finally, an artificial intelligence model is applied to classify targets, taking as inputs the narrowband and the broadband analysis. This classification is based on deep learning process, relied on the training, validation, and test phases in order to enhance the accuracy and reduce the loss. Our results showed that the suggested method is accurate (appx 83.5% SNR = 0db), depending essentially on the signal/noise ratio.
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  • EFFICIENCY STUDY ON THE AIR CONDITIONING SYSTEM ONBOARD A PASSENGER SHIP

    Alexandra-Nicoleta GOARDEȘ; Liviu-Constantin STAN
    4/1/2022
    DOI: 10.53464/JMTE
    21 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In the conditions of normal operation of ships, due to the release of heat from various machines and people, the increase in humidity as well as due to various releases of gases from on-board systems or goods being transported, the air in the rooms it degrades, requiring its replacement and processing. In the following we will present the issue associated with ensuring the comfort parameters on board ships, a matter regulated by international provisions on ensuring living conditions for crews - International Code for Safety Management and Pollution Prevention (ISM Code).
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  • MЕANS OF RЕDUCING THЕ IMPACT ON ARCTIC ЕNVIRONMЕNT OF AN ICЕBRЕAKЕR BALLAST SYSTЕM

    Alexandra-Nicoleta GOARDEȘ; Liviu-ConstantinSTAN
    4/1/2022
    DOI: 10.53464/JMTE.
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Gеnеrally, icеbrеakеrs havе bееn built as nuclеar-powеrеd Arctic ships, but for rеasons rеlatеd to thе protеction of thе еnvironmеnt, and еspеcially thе Arctic еnvironmеnt, this trеnd has bеgun to changе. A nuclеar icеbrеakеr is a typе of nuclеar-powеrеd motor vеssеl for usе in icе-covеrеd watеrs. In wintеr, thе icе along thе North Sеa routе variеs in thicknеss from 1.2 to 2.0 mеtеrs. Thе icе in thе cеntral parts of thе Arctic Ocеan has an avеragе thicknеss of 2.5 mеtеrs. Nuclеar icеbrеakеrs can pass through this icе at spееds of up to 10 knots (19 km/h). In icе-frее watеrs thе maximum spееd of icеbrеakеrs is up to 21 knots (39 km).
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  • DEFICIENCY ANALYSIS IDENTIFIED IN PSC INSPECTIONS USING EVENT TREE ANALYSIS

    S. M. ESAD Demirci; Kadir CICEK
    4/1/2022
    DOI: 10.53464/JMTE.
    6 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In the study, PSC inspections data performed in Paris MoU between the years 2016 and 2020 were analysed with the purpose of providing reasonable decision supports for key stakeholders such as ship operators, national and international authorities, cargo owners and classification societies in terms of enhancing safety on board ship and minimizing sub-standard ships in maritime transport. The probabilistic analysis is conducted with the help of Event Tree Analysis (ETA) method on deficiency risk areas respect to the number of deficiencies in each area. In the analysis, the deficiency risk areas are prioritized respect to the different combination of ship type and ship age. In the analysis made on the inspections data, it was found that the number of deficiencies detected under each relevant main item (deficiency risk areas) show significant variation for type of ship and age of ship. With the conducted analysis, in the study, it is aimed to contribute to the more effective inspection by focusing on certain deficiency risk areas in line with the ship type and ship age in the ship inspections.
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  • THE PROSPECTIVE POSTURE OF MARITIME EDUCATION IN SUPPORT OF SMART SHIPPING

    ERGÜN Demirel
    4/1/2022
    DOI:10.53464/JMTE.
    1 citation
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Maritime education covers the main seafarer’s education, but after emerging of a new profession in the maritime sector it has started to cover some other aspects of the industry such as port management, fleet management, shipyard management, etc. Additionally, the exponential development of technology enforced education planners to review and revise their programs frequently to meet the expectation of new technological and management structures. Realizing this situation, academicians in the maritime field should understand the new posture of the maritime industry and define their role and missions in the light of the new requirements of the maritime sector. This research aims to investigate the new role and the missions of maritime education institutes considering developments in science and technology in the next decade. In the first step, it is important to understand technological development affecting the maritime sector and imagine the future structure and requirements of the sector. Based on the results of this study a comprehensive study must be done to define what must be done in the education system to respond to new requirements. This research must be exhaustive and detailed. The problem areas are clearly defined and summarized as findings at the end of this step. These requirements must be adopted with academic programs. Adaptation of these corrective proposals to existing academic programs should be discussed considering how these new proposals are associated with the existing programs and/or matched with other related programs This study will assist the academicians and researchers who work on the development of the maritime education and training system using the results of this study.
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  • A COMPARATIVE ANALYSIS OF INDOOR POSITIONING TECHNOLOGIES IN SHIPYARD DIGITALIZATION CONTEXT

    Ibrahim CIL; Fahri ARISOY; Hilal KILINC; Ahmet Yunus CIL
    4/1/2022
    DOI:10.53464/JMTE.
    8 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Purpose: In the last few decades, there has been an increasing growth in research into the use of positioning technologies in open environments. Most of the technologies developed for outdoor environments are used successfully, however, they cannot be considered as fully successful indoors. In this context, various technologies based on Radio Frequency, Infrared, Ultrasound, Magnetic, Optical, and computer vision are proposed to improve positioning indoors. In addition to their individual use, it is also seen in hybrid applications. In particular, Radio Frequency based technologies have potential use in shipyard environments. For this purpose, technologies such as Bluetooth, Ultra broadband, Wireless Sensor Network, Wireless Local Area Network, Radio Frequency Recognition and Near Field Communication are seen as suitable technology options for shipyards. The indoor positioning system is a technology that has the potential to significantly improve work efficiency and safety in the shipyard area. It is difficult to achieve a successful digital transformation of the complex shipyard environment without identifying an Indoor positioning technology for the shipyard. In this study, it is aimed to design a positioning technology that will be most appropriate for the shipyard. Methodology: This paper analyses the challenges for the selection of Indoor positioning system for shipyards in evaluating Indoor-positioning technologies. The methodology followed in this study is a comprehensive comparative analysis of existing IPS technologies on how to digitize shipyards. This article provides an advanced assessment of indoor positioning technologies and their use in the challenging shipyard site. In this context, it provides an evaluation framework for different positioning measures such as accuracy, coverage, scalability, cost, privacy and usability of technologies that can be used within the scope of IPS. Results: The work carried out here on indoor positioning systems and components makes a significant contribution to the shipyard industry. Because it has a great impact on the suitability of technologies, especially in relation to the shipyard environment. Both the evaluation model and solution method, and the Bluetooth-based positioning technology, which stands out at the end of the evaluation, are important contributions of the study. Conclusion: To determine which indoor positioning systems are more suitable for the shipyard environment, both a detailed analysis of the shipyard environment and an evaluation were made to select the most suitable technology. The comparison was made based on observations of the shipyard site and the available literature on the field. This article makes important contributions to future shipyards' application of positioning technologies.
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  • THE STUDY OF A JIB CRANE FROM A CARGO SHIP

    Milis Nilgun CAIBULA
    4/1/2022
    DOI: 10.53464/JMTE.
    2 citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    This paper presents the study of a jib crane from a general cargo ship. There are numerous different types of vessels operating today in the various markets worldwide. Besides, thousands of cargo vessel ply the world’s oceans and seas each year, handling the bulk of international trade. The cranes from cargo ship is required to be adequate stability and strength for each load. All cranes from vessel are mounted on deck of the ship. Having regard in particular to the stress induced at its mounting or fixing points, adequately ballasted, securely anchored and supported by outriggers as necessary to ensure its stability when lifting. A jib from a crane from cargo ship is a type of overhead lifting device that is often used in a smaller work cell area for repetitive and unique lifting tasks. The extreme values of the stresses and reaction forces are determined by the finite element method. In this manuscript, the design of the cargo ship and the study of a jib crane are made using NX software from Siemens.
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  • STUDY OF CORROSION BEHAVIOR OF 1C45 STEEL COATED WITH ALUMINUM AND COPPER

    Mihaela Luminița BĂRHĂLESCU
    4/1/2022
    DOI: 10.53464/JMTE.01.2022.01
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    In the context of the judicious use of natural resources, the obtaining of the mechanical, electrical or protection or resistance characteristics necessary for their use and the economic optimization, it is necessary to study new methods. The method of deposition of surface layers with the help of pulsed lasers offers new directions of development. The deposition of aluminum or copper on cheap basic materials is economically justified but it is necessary to study their corrosion behavior. The study was performed on a 1C45 base material and on samples of the same material with a surface layer of aluminum and copper. The immersion of the samples for a period of 195 days provided measurable results which led to conclusions on the behavior of these materials in the marine environment. Contrary to expectations, the corrosion was manifested in copper, and aluminum showed a high protection capacity. However, the effects of the environment on the strength of the treated surface must also be taken into account during use.
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  • A TOOL FOR THE ASSESSMENT OF THERMAL EFFICIENCY OF IDEAL DIESEL CYCLES, PROVIDED TO FUTURE MARINE ENGINEERS

    Ionela TICU; Elena GOGU
    10/1/2021
    10.53464/JMTE.02.2021.11
    No citations
    Marine sciences and engineering; Renewable energies; Marine renewable energies and Sustenability; Advanced; technologies for MET; Climate changes
    Diesel engines are a type of internal combustion engine widely spread in the maritime sector. In a world depending on fossil fuels, the challenge faced by scientists and professionals consists in the efficient use of this kind of fuels. The future of these engines strongly depends on the efficiency enhancement. Future mechanical engineers have to be trained in order to gain engineering judgement and enterprising attitude. In this respect, this paper deals with a theoretical study focused on the improvement of the efficiency of the ideal Diesel cycle. This type of study was recently introduced in Constanta Maritime University, within Thermodynamics seminar activities, delivered to future marine engineers, enrolled in their third semester. This study will reveal the fact that the efficiency of Diesel cycles is affected by the variation of compression ratio, cut off ratio and specific heats ratio. The results obtained will show that, for the ranges taken into discussion, thermal efficiency might be enhanced by the rise of compression ratio and specific heat ratio values and by lowering cut off ratio values. The study is a predecessor of expensive and time costing experiences and it is also a guidance in the hand of future professionals – able to train them for real solutions.
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