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28 Scientific Journals of the Maritime University of Szczecin, no. 28 / 2011



 

Recent Submissions

  • Dereszewski, Mirosław (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2012)
    The paper presents an idea to utilize crankshaft’s angular speed variation and its derivative for monitoring of trouble of Diesel engine combustion quality. Measurement of instantaneous angular speed, recording and archive of values is easy to obtain using optical indicator and programmable logic controller. Advantage of this method is simple installation and constant signal. Collected data can be processed on board, basing on MS Excel formulas. Observation of changes of instantaneous speed and acceleration can not replace more accurate monitoring systems like Main Effective Pressure measurement or vibration monitoring, but is an excellent tool for early warning. When a signal about deteriorating of engine performance is obtain, more accurate diagnostic can be implemented. Expected final result will be elimination of engine’s cycle’s irregularity. Proposed method is at early stage of investigation and further steps to prove its utility and to develop concluding rules are to be conducted. In the paper are presented preliminary analysis of some bunches of data collected from two bulk carriers, operating in similar condition
  • Olszewski, Wojciech (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The article presents a combined system of a large power ship power plant. The system consists of a piston internal combustion engine and the steam turbine system which utilises the energy transported with the exhaust gas leaving the internal combustion engine. The analysed variant of the combined cycle includes a Diesel engine and a steam turbine with a single-pressure waste-heat boiler. The numerical calculations were performed for two low-speed internal combustion engines made by Wärtsilä and MAN Diesel \& Turbo, each of an approximate power output of 54 MW. The assumptions and limits which were used in the calculations done using a specially worked out code are included. The energy optimisation of the entire combined ship power plant was done taking into account only the thermodynamic point of view, leaving aside the technical and economic aspects
  • Matyszczak, Marek; Kaszycki, Leszek (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The article refers to BOG reliquefaction plants installed on the new generation LNG ships board. The construction, principle of operation and properties of the Hamworthy reliquefaction systems MARK I and MARK III were described. The layout diagrams and the process flow charts of these systems were enclosed. The construction comparisons of both systems were carried out and technology development advantages of the reliquefaction systems were presente
  • Listewnik, Jerzy; Wiewióra, Antoni (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The paper considers and analyses the application of gas (LNG) as a marine fuel for the whole of the merchant fleet. From made considerations, it is evident that up to year 2025 LNG will become a general ships fuel
  • Krystosik-Gromadzińska, Agata (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The paper describes current and future changes in regulations for marine fuel connected with sulphur oxides emission and the consequences of this process for shipowners and crews. Introducing new requirements concerning fuels caused appearing specific operating problems. The problems connected with exploitation after limiting of sulphur oxides emission refers mainly to protection of the fuel system (fuel injection pumps and injection valves). From the point of view of operating’s safety and a vessel itself, it is essential that engines, pumps, boilers and boiler burners are properly prepared for servicing and burning of low-sulphur fuels. The changes extorted the preparation of procedures of entrances and exits form the ECA zone and recommendations for shipowners and crews use. Shipowners carry out analytical research upon the influence of applied fuel upon safety of operating marine power plants, upon technical condition of operated machinery. Crews are trained in the scope of implementing the described changes. The other groups of problems are these connected with increase of operating costs and the danger of sea logistics roads transfer to road ones
  • Krakowski, Rafał (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The paper presents the characteristics to determine the effect of elevated temperature coolant in the cooling system on engine useful parameters, the torque, power, specific fuel consumption and efficiency as a function of the effective engine speed and specific fuel consumption, hourly fuel consumption and air consumption as a function of engine load. The most popular and widely used method of cooling is liquid cooling, which ensures uniformity of temperature around the combustion chamber and easy acquisition and transfer of heat, although the properties of water are limited to a maximum temperature of the coolant. Increase the efficiency of modern internal combustion piston engines is done by modern control systems units of each engine according to its operating conditions, reducing heat loss in engine cooling and recovering energy from exhaust gases (e.g.: turbine air compressors). The results of tests confirmed the benefits of increased coolant temperature. The set of characteristics that applies the pressure of the cooling system affect the fuel consumption, especially at high speed, which contributes to increase effective efficiency of the engine
  • Kowalewski, Tomasz (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    Complex technical objects such as ship power plant are the source of many hazards to their operators. Identification and elimination of these hazards on the finished objects is very labor-intensive task and involves significant financial outlays. Therefore, it would be advisable to carry out these activities much earlier – at the design stage. However, this entails to some difficulties. Depending on the design phase the designer has a limited amount of information from which the operator’s safety can be assessed. Additionally, this information is associated with considerable uncertainty. These difficulties can be overcome by using subjective estimates of persons having practical knowledge in the field of our interest – the experts. Such knowledge can be formulated most easily in linguistic categories, that is fuzzy logic language. In the paper the basis of construction of ship power plant operator risk assessment system at the design stage are presented. This system was based on a fuzzy inference mechanism. For this purpose linguistic variables are defined. Based on these variables, fuzzy risk assessment would be carried out. Variables were related to each other within the fuzzy rule base. Fuzzy inference in the system is based on the Mamdani model. Use of this system will enable the identification of hazards for the operators of ship power plant and will indicate the necessary corrective actions
  • Kołodziejski, Marcin (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    Paper presented difference between Reliability Centered Maintenance and reactive/preventive maintenance. Methods of performing RCM analysis which lead to selecting the most appropriate maintenance policy were described. Tasks designed to detect hidden failures – failure finding tasks – and the difference between hidden and evident failures were presented. Importance of failure finding tasks in failure prevention was discussed. Methods of how to determine the frequency of failure finding tasks were described. It was presented RCM analysis as a method to maintain desired availability of offshore dynamic positioning platform MSV “Regalia”
  • Klewski, Andrzej; Sanecki, Józef; Stępień, Grzegorz; Klewska, Weronika; Pabisiak, Paweł (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The article presents the analysis of accuracy position defining of sea infrastructure objects using high-resolution satellite imagery. The analysis bases on defining co-ordinates of objects using large-scale maps (field measurements) and their comparison to co-ordinates reading on processed satellite imagery. The article presents the author’s method of location precision enlarging on satellite imagery through additional imagery data support (geodetic and cartographic). Results of conducted analysis define accuracy of object’s location on satellite imagery and are related to the possibility of using these images to large scale cartographical studies
  • Klewski, Andrzej; Sanecki, Józef; Stępień, Grzegorz; Klewska, Weronika (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    In the article, the authors presented the conception of station for detection, location and analysis of ground and soil contamination. The mobile station of detecting and spatial analysis of ground contamination integrates apparatus applied in remote sensing and geophysical measuring. The remote sensing part of the station is based on hyperspectral remote sensing system which uses differential measurement of reflection coefficients of polluted and non-polluted surfaces. The geophysics part of the station involves two non-invasive methods: the radar and electro resistivity tomography (measurements of EM waves propagation in ground – water environment). These methods are complementary to each other. The integration of methods applied in two branches of science gives the entirely new possibilities of superficial ground contamination researches in connection with the depth of the contamination and its influence on underground structures such as: underground waters, water-bearing (aquiferous) layers, transmission or industrial installations. The interdisciplinary character of proposed method allows, through complex utilization of remote sensing and geophysics methods, to obtain a spatial and dynamic model of the contaminated terrain
  • Kaszycki, Leszek; Dorobczyński, Lech (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The paper presents a concept of application of optical displacement sensor type Sharp GP2Y0A02 in the linear positioning system containing rodless pneumatic actuator and programmable controller. The coupling circuit between sensor and controller, containing voltage controlled current source was proposed. The properties of measuring system were investigated, and some mathematical models of its static characteristic were found using the less squares method. The analysis of residual errors, and sum of squared residual errors were performed. Finally, the model minimizing the mentioned quantities, as well as measuring range of investigated system were selecte
  • Kaszycki, Leszek (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    The paper presents a concept of use the logical controller and typical pneumatic elements to construction of programmable manipulator. The construction, principle of action and properties of device were described. The paper contains also detailed functional schemes of system, as well as discussion of performed manipu-lator tests. Finally, the application area of described device was include
  • Herdzik, Jerzy (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    It was presented problems of fulfillment the IMO tier 3 requirements. The proposition of using selective catalytic reduction was very interesting, but provided to many maintenance problems due to the degrading mechanisms of that systems. Some of those mechanisms were presented. It provided to degradation of those systems and worsening their emission reduction possibilities. The certificate of EIAPP may not tell the truth. It needs periodical surveys (minimum one per year) for checking the validity of issued EIAPP certificate. A SCR system would be activated only on restricted areas of environmental emission control due to maintenance costs
  • Getka, Ryszard (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2011)
    This article discusses the importance of evacuation routes from machinery spaces, and analyze their availability in the event of emergency cases, such as fire, flooding, toxic threat, terrorist attack on modern ships with spaces in the area of the engine room. It describes and provides an analysis of the course of action of escape from machinery spaces in typical cases of the actual fires on ships of the Polish and foreign flags. It identifies the main threats and reasons for causing the unavailability of escape routes, identifies factors of delay, or even prevent the evacuation of people from such spaces in the risk situation. It shows the current status of the relevant international rules and the requirements of classification societies concerning the number and structure of the main and emergency escape routes. It presents the current proposals for the revision of international rules concerning the number and structure of the escape routes from machinery spaces on ships

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