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    Wyświetlanie 1-14 z 14
    Tytuł:
    Komputerowe przetwarzanie sygnałów radiowych
    Computer processing of radio signals
    Autorzy:
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/376786.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    programowanie obiektowe
    cyfrowe przetwarzanie sygnałów
    radio definiowane programowo
    Opis:
    Praca dotyczy cyfrowego przetwarzania sygnałów o częstotliwościach radiowych. Opracowano i zrealizowano program komputerowy pozwalający na pracę z sygnałami radiowymi, tj. filtrację, demodulację oraz wzmocnienie. Zastosowanie komputera znacząco rozszerzyło możliwości systemu oraz zapewniło możliwość podglądu widma sygnału radiowego, na podstawie którego możliwa jest ocena rodzaju i jakości odbieranego sygnału. System posiada również możliwość sterowania zewnętrznym urządzeniem odbiorczym z wykorzystaniem transmisji szeregowej.
    This paper concerns digital signal processing for radio frequencies. Developed and implemented a computer program which allows to work with radio signals, such as filtration, demodulation and amplification. The use of the computer significantly expanded capabilities of the system and provided the opportunity to preview radio spectrum, on the basis of which it is possible to evaluate the nature and quality of the received signal. The system also has possible to control the external receiver device using serial transmission.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 121-129
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odbiornik radiowy sterowany komputerowo
    Computer controlled radio receiver
    Autorzy:
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/376951.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    radio definiowane programowo
    mikrokontrolery
    programowanie
    projektowanie układów elektronicznych
    Opis:
    W pracy omówiono układ fizyczny odbiornika radiowego, którego zadaniem jest dopasowanie częstotliwości radiowych z zakresu od 0 do 30 MHz do możliwości przetworzenia ich na sygnał dyskretny przez przetwornik analogowo-cyfrowy będący standardowym wyposażeniem każdej karty dźwiękowej komputera klasy PC lub laptop. Przekształcenie częstotliwości pozwala na odbiór sygnałów radiowych modulowanych w różnych standardach przy pomocy komputera oraz odpowiedniej aplikacji przetwarzającej sygnały radiowe.
    The paper discusses the physical system radio receiver, whose task is to adjust radio frequencies range from 0 to 30 MHz for the possibility of processing them into discrete signal by the analog-digital converter which is standard equipment on every sound card of a PC or laptop. The transformation frequency allows the reception of radio signals modulated in various standards using a computer and the appropriate application processing radio signals.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 80; 55-62
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer set for processing radio signals
    Autorzy:
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97309.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    software defined radio
    microcontrollers
    programming
    electronic design
    object-oriented programming
    digital signal processing
    Opis:
    The work relates to digital signal processing of radio frequencies. Developed and implemented a computer program that allows to work with radio signals, ie. filtering, demodulation, strengthening and radio physical system whose task is to match the radio frequency range from 0 to 30 MHz for the possibility of processing them into discrete signal by the analog to digital which is standard equipment on every sound card of the PC. The use of the computer significantly expanded capabilities of the system and provided the ability to preview spectrum radio signal on the basis of which it is possible to assess the type and quality of the received signal.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 386-398
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykorzystanie systemów informacji geograficznej do wspomagania analizy rozpływu prądów błądzących pochodzenia trakcyjnego
    Use of geographic information systems to support the analysis of stray currents produced by d.c. traction
    Autorzy:
    Szymenderski, J.
    Machczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/376232.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    prądy błądzące
    programowanie obiektowe
    analiza przestrzenna
    internetowe bazy danych
    GIS
    OpenStreetMap
    Opis:
    W pracy opisano możliwość wykorzystania systemów informacji geograficznej do wspomagania złożonych algorytmów obliczeniowych. W pierwszej części przedstawiono charakterystykę algorytmów numerycznych pod względem złożoności obliczeniowej oraz środków potrzebnych do ich realizacji i sposobu przedstawienia wyników. Kolejna część niniejszego artykułu poświęcona jest systemom informacji geograficznej. Scharakteryzowano ich podstawowe własności oraz przedstawiono przykładowy system oparty na internetowej bazie danych OpenStreetMap. Kolejną część stanowi omówienie oprogramowania komunikującego się z systemem OpenStreetMap w celu uzyskania danych umożliwiających wykonywanie obliczeń rozpływu prądów błądzących w rzeczywistych układach trakcyjnych. Pracę kończą podsumowanie i wnioski.
    The paper discusses the possibility of using geographic information systems to support complex algorithms. The first part presents the characteristics of numerical algorithms in terms of computational complexity and resources required for their implementation and presentation of results. The next part of this article is devoted to geographic information systems. Their properties are discussed and an example of a system based on the online database is presented. Another part is a discussion of the software communicates with OpenStreetMap system in order to obtain data that allow calculations of stray currents propagation in real d.c. traction systems. The article ends with summary and conclusions.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 93-100
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Immunity of fixed installation to electrostatic discharge
    Autorzy:
    Typańska, D.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/378371.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    electromagnetic compatibility
    EMC
    Electrostatic Discharge
    ESD
    static electricity
    fixed systems
    intelligent building
    Opis:
    The article discusses the issues of immunity of fixed installations intelligent building to electrostatic discharge (ESD). The first chapter details with the characteristics of static electricity and presents the test methods of immunity discharge defined by the PN-EN 61000-4-2 - Testing and measurement techniques - Electrostatic discharge immunity test. Next chapter presents the installation of intelligent building. Its components are discussed and test of immunity to electrostatic discharge of this installation, taking into account the adaptation of Standard requirements is presented.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 85; 107-116
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Management of hybrid renewable energy source in smart building
    Autorzy:
    Szymenderski, J.
    Typańska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/377103.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    Hybrid Renewable Energy Source
    Smart Building
    SCADA
    KNX
    PV/T
    Opis:
    The paper presents how to manage renewable energy hybrid structure. The first section provides an example of a source hybrid PV/T panel and describes its construction and use. The next section shown the use of KNX installations for thermal management in rooms, presents examples of system configurations and work of the individual elements. The next part is devote to the presentation of the SCADA system and its use as a management software of hybrid sources. In the last part is present an example of model to simulate the operation of the entire system, its properties and describe their control structure.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 81; 191-196
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Management of hybrid renewable energy source in smart building with use SCADA system
    Autorzy:
    Szymenderski, J.
    Typańska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/97195.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    Hybrid Renewable Energy Source
    Smart Building
    SCADA
    KNX
    PVT
    Opis:
    The paper presents issues concerning the problems of energy management in buildings equipped with building automation systems and renewable energy from different sources. The first part discusses the issues of energy demand in buildings and the problems associated with its volatility during the circadian cycle and also provides an example of a source hybrid PV/T panel, describes its construction and use. Next part is the presentation of building automation systems and management systems. On this basis, it proposed to use the SCADA system and its connection with the installation of building automation as the supervisory software production and energy consumption in a detached house. In conclusion, it demonstrated the advantages of the presented solution, rated the possibility of implementation and benefits to users.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 433-442
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power line induced electric field and electromotive force in a nearby overhead circuit
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97415.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    overhead power line
    earth return
    induced electric field
    loop conductor
    electromotive force
    Opis:
    The study presents methods of the calculation of electric field induced in vicinity of an overhead current carrying conductor. Exact method of the determination of the induced electric field bases on the Fourier transform technique, whereas a simplified method uses the concept of complex ground return plane. Exact and simplified methods of the calculation of electromotive force (emf) induced in a loop located under an overhead power line conductor are also presented. The loop is treated as a rectangular loop (two-conductor closed loop) located near the power line horizontal to the earth surface. The exact method bases on the earth return circuit theory, whereas the simplified method allows one to calculate the induced emf under the assumption neglecting earth currents. The methods presented are illustrated by exemplary calculations.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 45-56
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical effects of stray currents from d.c. traction of complex geometry
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97580.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    stray currents
    d.c. traction
    complex geometry
    earth return circuit
    simulation
    Opis:
    The paper presents a method of the simulation of electrical effects of stray currents from d.c. tracrion of complex geometry. In the method the equivalent rail is considered as an earth return circuit. The models of the equivalent rail with current energization and the concept of superposition allow one to consider more complicated d.c. railway systems using a segmental approximation of the complex railway route and taking into account a number of substations and loads at any location. It is assumed in the paper that the system considered is linear, that the earth is homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents area, is illustrated by examples of computer simulation.
    Źródło:
    Computer Applications in Electrical Engineering; 2016, 14; 39-52
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization phenomenon in underground pipeline generated by stochastic stray currents from D.C. traction
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/377528.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    stochastic stray currents
    D.C. traction
    earth return circuit
    earth scalar potential
    simulation
    polarization phenomenon
    Opis:
    D.C electrified traction systems are a potential source of stray currents. The important problem, technically, is to evaluate the harmful effects (electrolytic corrosion) that an electrified railway has on nearby earth–return circuits (e.g. pipelines). This phenomenon is stochastic and may aggravate electrochemical corrosion in different places depending on the position of the vehicle, the load current, soil parameters, etc. The electric circuit approach, based on the complete field method of solution of the transmission–line problem (the earth–return circuit theory), to model stray currents interference on extended structures is presented. The electrode kinetics (polarization phenomenon) is taken into account in the model developed. Random algorithm allows to explore the phenomenon of polarization for different cases, which allows for generalization of the conclusions regarding the risk of corrosion in the studied systems.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 89; 111-122
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Models of traction stray currents interaction with the earth return circuits
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/377830.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    stray currents
    earth return circuits
    interaction
    simulation
    Opis:
    The paper presents methods for analyzing the impact of stray currents generated by DC electric traction on nearby earth-return circuits (pipelines). Various simulation models were developed and compared. First the current and potential of the rail were determined using two models. A model with distributed parameters and a model with lumped parameters consisting of chain-connected two-ports of the π type, for which the potential values in the nodes and currents in the branches were determined using the node potential method. The results obtained were used to further analyze the interaction between the railway rail and the pipeline. The pipeline model is presented in the form of a chain connection of π type two-ports. To determine the impact of stray currents on the pipeline, an analysis of the electric field in its vicinity was carried out. For this purpose, two methods have been developed. First, the analysis of the distribution of the scalar potential in the ground for a rail section of finite length was performed. Second method required taking into account the mutual conductivity of the two circuits (rail and pipeline), which in connection with the knowledge of the leakage current from the rail made it possible to determine the potential of the tested pipeline (using controlled voltage sources). The paper presents the implementation of methods and a comparison of the results obtained. The usefulness and applicability of the developed models for the analysis of the impact of stray currents from DC electric traction on earth-return circuits were also assessed.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 93; 227-239
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of stray currents generated by DC electric traction
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/378349.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    stray currents
    d.c. traction
    earth return circuit
    earth scalar potential
    simulation
    Opis:
    The paper presents two methods of the 3D simulation of the primary scalar potential of the electric flow field produced in the earth by d.c. traction stray currents. In the first method the equivalent rail is considered as an earth return circuit with distributed parameters, whereas in the second method the rail is treated as a circuit with lumped parameters. It is assumed in the paper that the system considered is linear, that the earth is homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 67-76
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution to studies on calculation of D.C. stray currents
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97183.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    stray currents
    d.c. traction
    earth return circuit
    earth scalar potential
    simulation
    Opis:
    The paper presents two methods of the 3D simulation of the primary scalar potential of the electric flow field produced in the earth by d.c. traction stray currents. In the first method the equivalent rail is considered as an earth return circuit with distributed parameters, whereas in the second method the rail is treated as a circuit with lumped parameters. It is assumed in the paper that the system considered is linear, that the earth is a homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents area, is illustrated by examples of computer simulation.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 28-41
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Voltage induced by currents in power-line sagged conductors in nearby circuits of arbitrary configuration
    Autorzy:
    Budnik, K.
    Machczyński, W.
    Szymenderski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/140488.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power line
    catenary
    vector potential
    overhead circuit
    induced voltage
    mutual inductance
    Opis:
    The study presents a calculation method of the voltage induced by power-line sagged conductor in an inductively coupled overhead circuit of arbitrary configuration isolated from ground. The method bases on the solution utilizing the magnetic vector potential for modeling 3D magnetic fields produced by sagging conductors of catenary electric power lines. It is assumed that the equation of the catenary exactly describes the line sag and the influence of currents induced in the earth on the distribution of power line magnetic field is neglected. The method derived is illustrated by exemplary calculations and the results obtained are partially compared with results computed by optional approach.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 227-236
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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