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Gdańsk University of Technology

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Publications from the year 2016

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  • Materiały i elementy stosowane do wykonania lekkiej obudowy. Cz. 2. Materiały ze szkła budowlanego
    • Dariusz Kowalski
    2016 Izolacje

    W artykule przedstawiono stosowane w lekkich obudowach materiały szklane i kształtowane z nich wyroby. Omówiono charakterystyczne parametry i różnice technologiczne występujące w produkcji wyrobów szklanych przeziernych. Przedstawiono parametry definiujące właściwości przegród wykonanych ze szkła.

  • Mathematical Modelling of a Seismic Isolation System to Protect Structures During Damaging Earthquakes
    • Tomasz Falborski
    • Barbara Sołtysik
    • Robert Jankowski
    2016 Key Engineering Materials

    The present study aims to determine the effectiveness of a nonlinear mathematical model in simulating complex mechanical behaviour of a seismic isolation system to protect structures during strong and damaging earthquakes. In order to construct the Polymeric Bearings considered in this research, a specially prepared flexible polyurethane elastomer with increased damping properties has been used. The usefulness of the proposed mathematical model has been verified by comparing the dynamic response of a base-isolated single-storey structure model under various seismic excitations with the results obtained from the detailed numerical analyses where the previously examined experimental model has been considered as a multi-degree-of-freedom system. The results obtained from the numerical investigation using lumped-mass models have confirmed that the proposed nonlinear mathematical model can be successfully used to simulate the complex mechanical behaviour of the Polymeric Bearings in numerical analyses.

  • Mathematical modelling of the overhead contact line for the purpose of diagnostics of pantographs
    • Sławomir Judek
    • Paweł Kaczmarek
    • Krzysztof Karwowski
    • Michał Michna
    • Mirosław Mizan
    • Andrzej Wilk
    2016 Full text Czasopismo Techniczne

    The overhead contact line (OCL) is the most effective way for supplying railway electric vehicles. The increase of the speed of the vehicles increases power consumption and requires ensuring proper cooperation of pantographs with OCL. The paper describes the novel mathematical model of the OCL system and the simulation results. The primary objective is a more accurate analysis to increase the reliability of the evaluation of monitoring and diagnostics. The model was based on the Lagrange energy method. The paper presents the structure of the model and equations describing it, as well as the results of some laboratory tests that were performed to determine the model parameters. The selected results of simulations concerning the effects of force impact on the contact wire were carried out using the created model. The prepared program can be used for creating computer tools, which will support designers of OCL.

  • Mathematical Models in Design Process of Ship Bow Thrusters
    • Andrzej Kopczyński
    2016

    The paper describes an application of simulation models for computer-aided design of ship bow thrusters. Generation of simulation models of ship bow thruster requires development and verifying of mathematical models of system component elements. Using the results of simulation the expert system is able to determine, that the rules of classification societies are met. Design procedures and mathematical models are part of an expert system for computer aided design of ship power systems. As an example, the simulations investigation of the bow thrusters dynamics are presented. As a result of the research simulations, the plots of electrical supply, load current, load torque, and rotation speed of the induction motor are presented.

  • Mathematical Models in Design Process of Ship Bow Thrusters
    • Andrzej Kopczyński
    2016 Full text

    The presentation is about an application of simulation models for computer-aided design of ship bow thrusters. Generation of simulation models of ship bow thruster requires development and verifying of mathematical models of system component elements. Using the results of simulation the expert system is able to determine, that the rules of classification societies are met. Design procedures and mathematical models are part of an expert system for computer aided design of ship power systems. As an example, the simulations investigation of the bow thrusters dynamics are presented. As a result of the research simulations, the plots of electrical supply, load current, load torque, and rotation speed of the induction motor are presented.

  • MATLAB i jego środowisko
    • Izabela Lubowiecka
    • Andrzej Ambroziak
    2016

    MATLAB jest pakietem obliczeniowym i programistycznym przygotowanym przede wszystkim do obliczeń numerycznych, analizy danych i wizualizacji wyników. Pakiet stanowi środowisko wyposażone w wiele narzędzi obliczeniowych i graficznych działających na bazie predefiniowanych funkcji oraz język programowania umożliwiający tworzenie własnych skryptów. Podstawowym typem danych w języku MATLAB jest macierz (matrix). Stąd nazwa MATrix LABoratory. Ułatwia to rozwiązywanie wielu problemów inżynierskich, które są sformułowane, jako problem o charakterze macierzowym lub wektorowym i ich programowanie w innych językach wysokiego poziomu takich, jak np. C lub Fortran wymagałoby więcej czasu. Serce pakietu MATLAB stanowi interpreter język umożliwiający implementację algorytmów numerycznych oraz biblioteki podstawowych działań na macierzach (odwracanie, dodawanie/odejmowanie, wartości własne i wiele innych). Zastosowanie programu MATLAB jest szerokie. Jest on wykorzystywany w matematyce i badaniach naukowych oraz zaawansowanych zagadnieniach inżynierskich, projektowaniu algorytmów, pobieraniu, przetwarzaniu i analizie danych, wizualizacji wyników, modelowaniu i symulacji problemów technicznych, grafice. Oficjalna strona producenta www.mathworks.com; pomoc techniczna dla użytkowników support@mathworks.com. Niniejszy podręcznik zawiera podstawy programowania w języku MATLAB i przeznaczony jest dla osób początkujących w programowaniu i używaniu opisanego pakietu. Zestawiono tu podstawowe funkcje algebry liniowej, funkcje graficzne, instrukcje sterujące a omówione tematy wzbogacono przykładami. Fragmenty kodów ujęto w ramki, co ułatwi ich odnalezienie. Podręcznik został przygotowany z myślą o studentach Wydziału Inżynierii Lądowej i Środowiska Politechniki Gdańskiej, jako pomoc do zajęć laboratoryjnych z programowania w języku MATLAB oraz innych zajęć wymagających znajomości pakietu i powstał na podstawie wykładów prowadzonych przez autorów oraz podręcznika użytkownika programu MATLAB.

  • MCSA with Normalized Triple Covariance as a bearings diagnostic indicator in an induction motor
    • Tomasz Ciszewski
    • Len Gelman
    • Leon Swędrowski
    2016

    Statistics of bearing failures in induction motors indicate, that they constitute more than 40% of IM damage, therefore bearing diagnosis is very important. Vibration methods for bearing diagnostics have one major disadvantage - they require the availability of the machine for sensors installation. This is the reason for seeking new methods based on motor supply current analysis. Diagnosis of induction motors, conducted remotely by measuring and analyzing the supply current is attractive with the lack of free access to the engine. So far, there is no solution based on analysis of current, the credibility of which allows use in industry. The article provides an overview of selected methods of diagnosis of induction motor bearings, based on measurement of the supply current. The problem here is the high disturbance components level of the motor current in relation to diagnostic components. The paper presents the new approach to signal analysis solutions, based on statistical methods, which have been adapted to be used by this diagnostic system. First experimental results with the use of this method confirm the advantages of the presented method.

  • Meandry Zarządzania
    • Waldemar Dzienisz
    • Marcin Forkiewicz
    • Marzena Grzesiak
    • Franciszek Kutrzeba
    • Aleksander Orłowski
    • Tomasz Jędrzej Rakowski
    • Alicja Sekuła
    • Zbigniew Tomczak
    • Katarzyna Tubielewicz
    2016

    ...

  • MEASUREMENT AND ANALYSIS OF TRANSMISSION LOSSES IN THE SUPPLY SYSTEM OF ELECTRIFIED TRANSPORT
    • Mikołaj Bartłomiejczyk
    • Piotr Hołyszko
    • Piotr Filipek
    2016 Full text Journal of Ecological Engineering

    The issue of electric energy saving in public transport is currently becoming a key area of interest, a fact connected with both an increase in society’s environmental awareness and a rise in the prices of fuel and electricity. Electricity can be saved by reducing transmission losses in the supply system. The article presents a method of measurement and analysis of transmission losses in the supply system of electrified public transport on the example of trolleybus transport in Gdynia and Lublin in Poland.

  • Measurement of distance, velocity and angle of arrival using FMCW-CW combined waveform
    • Damian Duraj
    • Marek Płotka
    • Mateusz Rzymowski
    • Krzysztof Nyka
    • Łukasz Kulas
    2016

    A procedure of tacking small flying object based on a general principle of FMCW and Doppler radar is presented. In order to increase measurement range, this technique uses active signal source on the moving object. For simultaneous measurements of distance, radial velocity and direction (AoA) as well as simplified synchronization a combined FMCW-CW waveform is proposed. The presented measurement system was realized and verified in the field during flight tests of a research rocket.

  • Measurement techniques for assessing the olfactory impact of municipal sewage treatment plants
    • Jacek Gębicki
    • Hubert Byliński
    • Jacek Namieśnik
    2016 Full text ENVIRONMENTAL MONITORING AND ASSESSMENT

    The study presents information about the measurement techniques used for the assessment of air quality in terms of the olfactory intensity resulting from the operation of municipal sewage treatment plants. Advantages and disadvantages of the measurement techniques used are presented. Sources of malodourous substance emission from sewage treatment plants were described, and the malodourous substances emitted were characterised. Trends in development of analysis and monitoring of the malodourous substances in the air were also presented.

  • Measuring Consumers' Engagement With Brand-Related Social-Media Content. Development and Validation of a Scale that Identifies Levels of Social-Media Engagement with Brands
    • Bruno Schivinski
    • George Christodoulides
    • Dariusz Dąbrowski
    2016 JOURNAL OF ADVERTISING RESEARCH

    The purpose of the current study was to develop a scale to measure the consumer's engagement with brand-related social-media content, based on three dimensions established in the framework of an earlier theoretical construct, “Consumer's Online Brand-Related Activities” (Muntinga, Moorman, and Smit, 2011). Qualitative techniques were used to generate an initial pool of items that captured different levels of consumer engagement with consumption, contribution, and creation of brand-related social-media content. Quantitative data from a survey of 2,252 consumers across Poland then was collected in two phases to calibrate and validate the ensuing scale, measuring participants' engagement, with nearly 300 brands spanning a range of industries. Results confirmed the structure and psychometric properties of the scale.

  • Meat freshness classification using ultra-fast gas chromatography
    • Wojciech Wojnowski
    • Tomasz Majchrzak
    • Tomasz Dymerski
    • Jacek Namieśnik
    2016

    Meat constitutes an important component of human diet. In order to ensure that it is safe to consume, it is important to be able to determine whether a particular sample is fresh. To this end, an analysis of the headspace of pork, beef, and poultrywas performed over a period of seven days using ultra-fast gas chromatography. Compounds that may possibly be used as indicators of spoilage were identified. Based on the obtained results it was concluded, that it is possible to distinguish between particular meat samples based on the day of analysis, as well as differentiate between different kinds of meat.

  • Mechanical behaviour of knit synthetic mesh used in hernia surgery
    • Agnieszka Tomaszewska
    2016 Full text Acta of Bioengineering and Biomechanics

    Purpose: There is a discussion in literature concerning mechanical properties and modelling of surgical meshes. An important feature of elastic modulus dependency on load history is taken into account in this paper, as implants are subjected to variable loading during human activity. The example of DynaMesh®-IPOM surgical implant is studied. Methods: The analysis is based on failure tension tests and cyclic loading and unloading tests performed for the material samples. Stiffness changes of the material samples within successive load cycles are noted. The values the elastic modulus of the material tend to during successive cycles determine the material stiffness in the preconditioned state. The analysis is performed for two axes of the mesh, as the material reveals orthotropic properties. Results: For the initial displacements state of the material bilinear stiffness functions are determined for the two considered material axes. The functions for the preconditioned state are specified basing in the observed stiffness changes in subsequent loading cycles in experiments with different load (and strain) ranges. The identified elastic modulus values for different strain levels in the preconditioned state are then a basis for the nonlinear stiffness function formulation. Conclusions: The author concludes that two states of the considered mesh should be considered in calculations, initial and preconditioned ones. As the material stiffness in its preconditioned state is higher than in the initial one, omitting of the preconditioned state in calculation, e.g., considering fixation of the mesh, may lead to underestimation of necessary fixation strength.

  • Mechanical characterization of a gravel column in a calibration chamber operating as a triaxial cell
    • Lech Bałachowski
    2016

    A series of tests considering the behavior of gravel columns was performed. A segment of column with a height of 1 m and a diameter of 0.53 m was modelled in a calibration chamber used as a triaxial cell at three different lateral stress applied. The vertical load transferred on the column head was simulated with steady increase of water pressures in the upper and lower membranes. During the loading the volumetric changes in the column material were measured. The influence of lateral membrane rigidity and the effect of encapsulated column were analyzed. The strength and deformation parameters of gravel material determined in the calibration chamber operating as a triaxial cell are discussed.

  • Mechanical properties of mosquito nets in the context of hernia repair
    • Andrzej Ambroziak
    • Katarzyna Szepietowska
    • Izabela Lubowiecka
    2016 Full text COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING

    The paper deals with issue of applying mosquito nets as implants in hernia repair, which have already been used in resource-poor developing countries. Uniaxial tensile tests have been conducted on polyester mosquito meshes in two orthogonal directions. Non-linear elastic constitutive laws parameters have been identified to be applied in dense net material models. Mechanical performance of tested mosquito nets has been compared with properties of commercial implants used in treatment of hernia and with properties of human tissue. This study contributes to mechanical knowledge of hernia repair issue by investigation of cheaper alternative to commercial implants.

  • Mechanism-based inactivation of human cytochrome P450 1A2 and 3A4 isoenzymes by antitumor triazoloacridinone C-1305.
    • Agnieszka Potęga
    • Barbara Fedejko-kap
    • Zofia Mazerska
    2016 Full text XENOBIOTICA

    5-Dimethylaminopropylamino-8-hydroxytriazoloacridinone, C-1305, is a promising antitumor therapeutic agent with high activity against several experimental tumors. It was determined to be a potent and selective inhibitor of liver microsomal and human recombinant cytochrome P450 (CYP) 1A2 and 3A4 isoenzymes. Therefore, C-1305 might modulate the effectiveness of other drugs used in multidrug therapy. The objective of this study was to investigate the mechanism of the observed C-1305- mediated inactivation of CYP1A2 and CYP3A4. Our findings indicated that C-1305 produced a time- and concentration-dependent decrease in 7-ethoxycoumarin O-deethylation (CYP1A2, KI = 10.8 ± 2.14 mM) and testosterone 6bhydroxylation (CYP3A4, KI = 9.1 ± 2.82 mM). The inactivation required the presence of NADPH, was unaffected by a nucleophilic trapping agent (glutathione) and a reactive oxygen species scavenger (catalase), attenuated by a CYP-specific substrate (7-ethoxycoumarin or testosterone), and was not reversed by potassium ferricyanide. The estimated partition ratios of 1086 and 197 were calculated for the inactivation of CYP1A2 and CYP3A4, respectively. In conclusion, C-1305 inhibited human recombinant CYP1A2 and CYP3A4 isoenzymes by mechanism-based inactivation. The obtained knowledge about specific interactions between C-1305 and/or its metabolites, and CYP isoforms would be useful for predicting the possible drug–drug interactions in potent multidrug therapy.

  • Mechanizm zapewniania ciągłości transmisji w sytuacji awarii elementów bezprzewodowej sieci na morzu
    • Kanstantsin Myslitski
    • Jacek Rak
    2016 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    Przedstawiono charakterystykę metody niezawodnej transmisji w ramach bezprzewodowej architektury sieci Internetu na Bałtyku (zaprojektowanej bez wykorzystania łączy satelitarnych), rozwijanej w ramach projektu netBaltic. Szczególny nacisk położono na opis i weryfikację charakterystyk metody transmisji dla scenariusza awarii wielu elementów sieci. Dokonano zarówno szczegółowego opisu proponowanej metody transmisji, jak i weryfikacji symulacyjnej charakterystyk potwierdzającej jej skuteczność w podtrzymywaniu przekazu informacji mimo awarii łączy sieci.

  • Mechanizmy zarządzania mobilnością węzłów w systemie netBaltic
    • Michał Hoeft
    • Krzysztof Gierłowski
    • Józef Woźniak
    2016 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    Zarządzanie mobilnością w specyficznym środowisku komunikacyjnym, jakim jest środowisko morskie, wymaga dedykowanych rozwiązań przystosowanych do pracy w trudnych warunkach propagacyjnych, a jednocześnie zapewniających możliwość wykorzystania różnych technik transmisji. W artykule zaprezentowano rozwiązanie opracowane w ramach projektu netBaltic. Przedstawiono architekturę węzła z wprowadzonymi na potrzeby obsługi mobilności dodatkowymi modułami funkcjonalnymi. Dodatkowo omówiono główne scenariusze przełączania dotyczące komunikacji jednostek pływających ze stacjami nabrzeznymi oraz zmiany korzenia drzewa transmisji danych w sieci kratowej.

  • Mechatronic Design Towards Investigation of the Temporo-Mandibular Joint Behaviour
    • Creuillot Victor
    • Dreistadt Cynthia
    • Krzysztof Jan Kaliński
    • Lipinski Paul
    2016

    A significant problem of the temporo-mandibular joint (TMJ) research is lack of data concerning geometry and position of TMJ discs. It leads to necessity of developing a driving method of the process optimization, which is based on chosen techniques of mechatronic design. In particular, the latter concerns a technique of experimentally supported virtual prototyping. On this stage, the research is characterized by well-verified constitutive characteristics of all components, engagement of real components of the research system, offline experimental identification of the TMJ system parameters, offline experimental determination of the appropriate parameters of the TMJ, online computation of the TMJ process of non-stationary model and assessment of the driving method’s efficiency. In case of the medium opening–closing jaw motion, results of the FEM are close to the experimental data and validate discs’ geometries and positions. Quality of the obtained solution is also verified by analysing the contact between discs and surrounding bones. In case of the immediate clenching simulation, a comparison of finite element model simulation and dental plaster mould occlusions testifies the correctly reproduced occlusal scheme. Values of the contact forces and the contact area surfaces enable calculation of the mean contact pressure values on the cranial and caudal faces of the discs. The obtained model allowed reproducing accurate anatomic mandible trajectories and also a physical occlusion.