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Browsing by Author Gawdzińska, Katarzyna: 51 Scientific Journals of the Maritime University of Szczecin

  • 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.

Other publications

  • Kostrzewa, Waldemar; Gawdzińska, Katarzyna; Bejger, Artur (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    This study is aimed at the determination of the significance of faults diagnosed in refrigerating plant components of fishing vessels. The problem is described by the Pareto-Lorenz analysis. The field work covers vessels of the Polish fishing fleet. Ships under examination are typical of the Polish fishing vessels operating at sea. The research has been based on data gathered in 2007–2011, consisting of 235 faults, detected and estimated for refrigerating systems of 25 small vessels of the Polish fishing fleet. Taking the refrigerant as a criterion of division, we have analyzed two types of vessels
  • Gawdzińska, Katarzyna; Nagolska, Dorota; Kochmańska, Agnieszka (Scientific Journals of the Maritime University of Szczecin, Zeszyty Naukowe Akademii Morskiej w Szczecinie, 2013)
    Quality of composite castings with infiltration reinforcement is dependent on many various factors. Technological parameters of the saturation process, manufacturing methods and quality of components are considered as the basic ones. During the recycling process of composite materials, the basic component that is being reclaimed is the metal matrix. The main aim of this paper is an evaluation of chemical composition and microstructure of the recovered metal matrix material. In the first stage, influence of preparation of liquid matrix metal is analyzed, with particular attention paid to its purity, degree of degassing and overheating, as well as an influence of the reinforcing material type on the final structure of composites obtained in the process of vacuum saturation. Specific of the structure and flaws occurring in such materials are of the particular concern here, as they are decisive for the methods of quality evaluation of these materials. Manufactured composite’s castings are subjected to the recycling process by a melting of the metal matrix on the second stage. The metal obtained in this way is analyzed regarding impurities ccurring in its volume and, simultaneously, a comparison of evaluation methods of traditional metal alloys and metal composite castings is performed.
  • Chybowski, Leszek; Gawdzińska, Katarzyna; Ślesicki, Oskar; Patejuk, Kamil; Nowosad, Grzegorz (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    The paper presents basic information about the prevention of explosions and fires in marine engines, with particular reference to explosions in the crankcase. It also discusses the possibility of using engine room simulators in educating marine officer engineers to prevent dangerous situations during actual marine diesel operation. Two scenarios have been shown that illustrate the developments in the case of improper operation of main bearings while the operation of an engine safety system is intact and there is lack/override/failure of safety systems. In scenario I the main engine shut down occurs and scenario II simulates an explosion in the crankcase.
  • Gucma, Maciej; Bryll, Katarzyna; Gawdzińska, Katarzyna; Przetakiewicz, Wojciech; Piesowicz, Elżbieta (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    A single polymer composite comprises a composite built out of fibres and a matrix, both made of the same or a very similar polymer material, where the components may differ with: molecular mass, density or branching degree. Such thermoplastic composites provide the beneficial mechanical characteristics required for reinforced materials, and their great advantage is the ease of full material recycling after the end of use. The aim of the presented work is to provide a description of the manufacturing technology, with a definition of the possibility for the waste of single polymer polyester composites to undergo a full material recycling process, oriented towards use in shipbuilding. A proposed idea for recycling is in the preparatory stage and its assumptions and the process followed will be the subject of a patent application. This work forms part of the studies realized in the scope of the REP-SAIL Project under the ERA-NET Transport III Initiative Future Travelling, carried out at the Maritime University of Szczecin, and the prepared doctoral thesis entitled “Manufacturing, shaping of operational properties and recycling of single polymer composite materials”.
  • Kędzierska, Katarzyna; Tuleja, Joanna; Gawdzińska, Katarzyna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Przedstawiono wyniki badań oceniających odporność na zmęczenie cieplne matę♦ rialów żaroodpornych o składzie chemicznym (% mas.): 17 + 31% Cr i 18 + 41% Ni. Próbki z doświadczalnych stopów poddano 75 cyklom zmęczeniowym. Odporność na zmęczenie cieplne oceniono na podstawie liczby tworzących się pęknięć. Opracowano zależność matematyczną między liczbą pęknięć, a liczbą cykli zmęczeniowych.
  • Chybowski, Leszek; Gawdzińska, Katarzyna (Scientific Journals Maritime University of Szczecin, Zeszyty Naukowe Akademia Morska w Szczecinie, )
    Selected issues of component importance analysis for complex technical systems have been presented in this paper. A generic example of a complex technical system and selected statistics of operating losses have been described. A description and diagrams of both qualitative and quantitative importance analysis have also been included. The most significant problems facing complex technical system modelling have been pointed out. A multi-criteria system component importance analysis and the basic criteria for a system component quality evaluation have also been introduced. Some factors influencing the importance of the technical system’s components have also been described. Finally, the necessity of further developing importance analysis methods for machinery operation has been highlighted.

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