English Polski
Akademia Morska w Szczecinie

DSpace Home

DSpace/Manakin Repository

Advanced Search

  • Nourghasemi, Hadi; Bakhtiari, Mohammad; Ghassemi, Hassan (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    One of the most effective methods to diminish the drag of a planing craft is to use a step at the bottom of the hull. A stepped hull causes a reduction of the wetted area and, as a result, a decrease in the drag. The step may be designed as a straight line through the entire width of the hull or may be V-shaped with a forward or backward swept angle. In this paper, the effects of the step forward swept angle on the hydrodynamic performance of a hard chine planing vessel are investigated by finite volume method (FVM). Reynolds-Averaged Navier Stokes (RANS) equations with a standard k-ε turbulence model coupled with volume of fluid (VOF) equations are solved in order to simulate a transient turbulent free surface flow around the hull with the help of Ansys CFX software. In order to predict hull motions, equations of rigid body motions for two degrees of freedom (2-DOF) are coupled with fluid flow governing equations. To validate the presented numerical model, first the numerical results are compared with available experimental data, and then the obtained numerical results of the drag, dynamic trim, sinkage, wetted keel length, wetted chine length, pressure distribution on the hull, wetted surface and wake profile at different Froude numbers and step angles are presented and discussed.
  • Mielniczuk, Sylwia (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Various methods of trajectory determination are used for finding solutions to collision situations involving ships. This applies to avoiding collisions with other ships or stationary objects. In addition to the methods generally used, new or modified versions of methods derived from other modes of transport are proposed. One of the algorithms for route determination serving to avoid obstructions is the method of artificial potential fields, used for determining routes of mobile robots. The method is used in maritime transport, for instance for detecting anomalies in ship movement. The article presents the method of potential fields used for solving the problem of route selection avoiding navigational dangers and obstacles. This article presents an algorithm of route determination based on the said method, its implementation in the MATLAB program and examples of application for the ship’s safe trajectory determination in some navigational situations.
  • Szymankiewicz, Dariusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Implementation of ERIKA III, the third package of EU legislation intended to integrate international standards of marine accident investigation, has significantly changed the way Polish public authorities investigate marine accidents. Until the implementation, maritime chambers conducted the investigation of marine accidents. Since October 2012 there has been a dual system in place whereby public authorities are entitled to investigate marine accidents in Poland. This article reviews distinctive features of both approaches and the impact thereof on the system of investigating marine accidents. Beside a theoretical description of the legal basis for the functioning of both maritime chambers and the State Marine Accident Investigation Commission, this paper includes analytic data of investigations conducted by both these bodies in order to prove that the number of investigations conducted by maritime chambers has drastically decreased since the establishment of the State Commission, and that the number of investigations conducted by the State Commission itself cannot be sufficient, leading to a decrease of safety in maritime navigation.
  • Chybowski, Leszek; Gawdzińska, Katarzyna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents the application of cost-based, component-importance measures for complex technical systems. A stern tube sealing system installed on a sea vessel was used as an example of a complex technical system. Selected statistics of a ship’s operation losses were calculated. Selected, known-importance measures were presented and the authors’ own approach to cost-based, component-importance analysis was shown. The following measures were discussed: the operation-interruption cost index, the maintenance potential, the simulation- based maintenance index, and maintenance and operational costs. A description of factors influencing the importance of the technical system components was provided.
  • Dziechciarz, Mateusz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Seaports are important points in international supply chains. As hubs for several transport sectors, seaports are an essential element of transport corridors. Over the years, the types of cargo moving through the ports in Szczecin and Świnoujście have changed significantly. In the last two decades, the largest transhipments were typically coal, grain and other bulk cargoes; this is reflected in the share of total hinterland shipments transported by different transport methods. In 2005, more than 2/3 of the cargoes delivered to and from the ports of Szczecin and Świnoujście were transported by rail. Rail transport continued to account for the leading share of hinterland transport until 2011, when road transport started to dominate (46.3% of cargo carried by rail and 47.50% by trucks). This is indicative of a correlation between the type of cargo and its mode of hinterland transport. With an increase in general cargo transhipments, the share of shipments travelling to and from the ports by road transport has increased. In turn, the fall in coal shipments is reflected in rail transport’s share decreasing. In 2005, 3.8% of coal was transported by roads and 80% by rail. In the following years, despite the decrease in the share of global transhipments accounted for by coal, road transport’s use for coal transport increased. This indicates that the type of cargo is not the only factor influencing the relative contributions of different modes of transport to hinterland travel.
  • (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    With regards to safety, the International Maritime Organization (IMO) and the International Association of Classification Societies (IACS) regularly issue regulations and technical standards for the design and construction of ships in order to safeguard the crew and people on board. In light of these regulations, three issues concerning the properties of a bulk carrier are investigated. Initially the floodability of a bulk carrier is researched to investigate the largest possible volumes of compartments which can be flooded without causing a bulk carrier to capsize. The results are determined by means of a marine design software, Maxsurf Enterprise.
  • Łapko, Aleksandra; Hącia, Ewa (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This article aims to present the results of the analysis of selected aspects of transport accessibility (from the land and water) of two coastal areas situated on the Baltic coast of the Western Pomeranian region. It was assumed that transport accessibility affects the number of tourists visiting the selected areas – Kołobrzeg County (mainly the city of Kołobrzeg) and Świnoujście. The analysis was based on econometric modeling. For the timescale investigated (1995–2016), linear and parabolic trends were estimated and, as a result of their extrapolation, tourism forecasts in both coastal areas were estimated up to the year 2020. Statistical data for the years 1995–2016 was collected by the Central Statistical Office of Poland. In addition, literature and online resource research was conducted.
  • Herbin, Paweł (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Controlling the upper limb with force feedback requires the continuous measurement of multiple values, so it is necessary to use a specific measuring system. The position of the joints and the torque produced by the drives are the basic feedbacks necessary for control. Measurement of the joint positions does not cause complications, while measurement of the driving torque is much more complex. This article describes the methods of implementing an exoskeleton drive system through a closed loop conduit system based on Bowden cables, and the integration of a torque sensor within the wheel of the exoskeleton. The integration of the sensor within a mechanical part of the construction of the exoskeleton is the main advantage of the developed sensor because it does not affect the dynamics of the exoskeleton. This article presents the process of designing, calibrating and validating the proposed link wheel torque sensor.
  • Korostil, Jerzy (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    A method of predicting the influence random events on the critical functionality of an object is discussed. Research is performed regarding the possibility of extending a prediction model to a prediction system by functionally uniting this model with additional models or recognizing the type of influence of a random event on a complex technical object. The proposed solution is importatnt because executing a prediction system instead of a prediction model allows one to detect critical situations that, when influencing technical objects, can result in the catastrophic loss of functionality of the corresponding objects.
  • Szelangiewicz, Tadeusz; Żelazny, Katarzyna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Ocean mining systems that incorporate a single or double lift pipe are two methods used to obtain polimetallic nodules from the seabed. The pipe must be equipped with main cables and flexible pipe attached to the mining vehicle collecting nodules. While mining, the pipes in the vertical configuration are moving along with the ship above. They are subjected to currents in the water column. Such current-induced hydrodynamic drag results in a vertical deflection, which is dependent – among other factors such as varying current velocity at points along the length of the pipe. The present paper presents results of computer simulations using commercial CFD software to model the hydrodynamic forces acting on the vertical pipe of ocean mining systems. The results present the influence of the water flow direction in relation to the lift pipe on the hydrodynamic force and torsional moment acting upon the pipe.
  • Twardochleb, Michał (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    In the modern economy, effective teamwork is essential in the majority of industries. Teams of specialists such as crewmen and software developers need to be able to work together properly. The appropriate selection of team specialists according to their soft competencies results in synergies, and streamlines tasks. This paper presents the results of studies aimed at assessing the impact of team role configurations on overall team performance.
  • Chybowski, Leszek (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Dear Readers, It is my great pleasure to present to the new issue 50 (122) of the Scientific Journals of the Maritime Academy in Szczecin. This publication contains the most recent research results on marine engineering, energy, navigation and transport engineering. The introductory article in this issue has been prepared by Dr Floris Goerlandt, a researcher from Aalto University, Helsinki. It focusses on modelling oil spill scenarios from tanker collision accidents in the Northern Baltic Sea. This publication has been financed from the funds for activities of promoting science: grant No. 790/P-DUN/2016 of the Polish Ministry of Science and Higher Education. It is my expectation that this material will be attractive to all readers interested in the issues of security in marine transport and minimising the results of ecological disasters. The Marine Technology and Innovation section contains papers on infrared cameras used in detecting sources of fire on ships, estimating oil consumption based on ship service parameters in real weather conditions, and on the effect of the angle of attack on the generated water wave propagation. The Navigation oriented section includes papers on the concepts of route prediction for a person drifting in water, analyses of vessels traffic flow on a waterway bend as well as radiocommunication and detection of spoofing using differential GNSS. The Transportation Engineering section contains articles addressing inland transport, operation of a sea port and vehicle safety. To access the electronic version of the current issue or archival volumes, please visit our website http://scientific-journals.eu/. You will also be able to access all papers published by the Scientific Journals from 1973. The digitalisation and sharing of archival issues has been financed by the Ministry of Science and Higher Education from the fund (above) for activities associated with the promotion of science. I strongly encourage and invite authors to submit their work and readers to forward their comments to the journal.
  • Goerlandt, Floris (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Oil spills from maritime activities can lead to very extensive damage to the marine environment and disrupt maritime ecosystem services. Shipping is an important activity in the Northern Baltic Sea, and with the complex and dynamic ice conditions present in this sea area, navigational accidents occur rather frequently. Recent risk analysis results indicate those oil spills are particularly likely in the event of collisions. In Finnish sea areas, the current wintertime response preparedness is designed to a level of 5000 tonnes of oil, whereas a state-of-the-art risk analysis conservatively estimates that spills up to 15000 tonnes are possible. Hence, there is a need to more accurately estimate oil spill scenarios in the Northern Baltic Sea, to assist the relevant authorities in planning the response fleet organization and its operations. An issue that has not received prior consideration in maritime waterway oil spill analysis is the dynamics of the oil outflow, i.e. how the oil outflow extent depends on time. Hence, this paper focuses on time-dependent oil spill scenarios from collision accidents possibly occurring to tankers operating in the Northern Baltic Sea. To estimate these, a Bayesian Network model is developed, integrating information about designs of typical tankers operating in this area, information about possible damage scenarios in collision accidents, and a state-of-the-art time-domain oil outflow model. The resulting model efficiently provides information about the possible amounts of oil spilled in the sea in different periods of time, thus contributing to enhanced oil spill risk assessment and response preparedness planning.
  • Bistrović, Miroslav; Ristov, Pančo; Komorčec, Domagoj (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    One of the key benefits of using thermal imaging is the ability to predict possible fire hazards due to increases in temperature in controlled areas in a particular marine facility or system. This study proposes the possibility of applying new electronic and computer technology as part of a ship’s fire detection system, such as the use of computer vision, using existing marine CCTV systems and installing thermal imaging IR cameras on the same system. It also proposes communication between the CCTV system and the fire detection and central alarm system of a ship. In addition to visual analysis of certain areas on board the ship and the related facilities inside it, with the addition of certain software applications into the existing CCTV system, the system itself becomes a fire alarm system, with the potential to forecast and send early warnings to the ship’s central fire alarm system in real time, thereby contributing to improved safety with regards to various areas, equipment, the ship as a whole, cargo and human lives.
  • Cepowski, Tomasz; Drozd, Andrzej (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    This paper deals with fuel consumption estimations relating to container ships on the basis of ship service and wave parameters. Data, on which to base estimations, was measured and recorded from a container ship during 96 months at sea. Approximating functions were calculated by the use of curve fitting techniques and regression methods, utilizing newly developed software named ndCurveMaster. The approximation function presented in this paper could have practical application for the estimation of container ship fuel consumption, while considering weather routing. In addition the study clearly shows the relationship between the fuel consumption of a container ship and the number of months since its last docking. These results may form the basis for further research in this direction.

Search repository

Advanced Search

Browse

My Account

RSS Feeds