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    Wyświetlanie 1-6 z 6
    Tytuł:
    An embedded vision-based tracking system for autonomous robot navigation
    Autorzy:
    Mazur, K.
    Kryjak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/114292.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    FPGA
    embedded vision system
    tracking
    mean-shift
    autonomous vehicles
    Opis:
    In this paper, a prototype of an autonomous vehicle with an FPGA based computing system is described. It uses an ultrasonic sensor and a camera as sources of information about the surrounding environment. The vehicle is able to track an object selected by the operator (it does not need to be defined a-priori). In the proposed solution, the mean-shift algorithm is used. It has been adapted to operate in a pipeline, real-time vision system. The control unit is built of two PD controllers which determine the PWM ratio for the left and right DC drive. The whole system has been implemented on the Atlys development board with Spartan 6 FPGA device from Xilinx.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 5; 172-174
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of dynamical properties of object tracking system elements
    Autorzy:
    Kuś, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/199774.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    unmanned aerial vehicles
    object tracking
    control system
    dynamical model
    bezzałogowe statki powietrzne
    śledzenie obiektów
    system sterowania
    model dynamiczny
    Opis:
    The goal of this paper was to determine necessary dynamical conditions for the object tracking task. Developing these conditions required examining dynamical relationships between the UAV, camera head, disturbances and tracked object. This analysis was conducted in order to assess whether a given UAV-camera head set was suitable for a given object tracking task. The study assumed that the UAV was equipped with a flight trajectory control system. We discussed the methods of the dynamical properties description and finding a range of application for a particular set “UAV-camera head”. For each dynamical element of the examined system, we proposed a method of computing the parameters of the simulation model which corresponded to the behaviour of the real elements. In order to describe the range of the applications for the UAV-camera head set, we defined the space Ω – all combinations of the parameters which characterized the dynamics of the disturbance and object. Moreover, this study developed the method of selecting the subspace Ωs which described acceptable parameters of the object’s and disturbance’s dynamics. This paper presented the example of proper object tracking in the case of meeting the dynamical conditions and the example of losing the object in the opposite case.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 479-489
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Prediction Methods Applied to a Selected Road Vehicle Tracing System
    Analiza metod predykcji trajektorii pojazdów drogowych zastosowanych w wybranym systemie poszukiwania
    Autorzy:
    Łukasik, Z.
    Górska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/310740.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    road vehicles
    prediction
    vehicle trajectory
    vehicle search system
    road network
    observation points
    object tracking
    pojazdy drogowe
    predykcja
    trajektoria ruchu pojazdu
    system poszukiwania pojazdów
    sieć dróg
    punkty obserwacyjne
    śledzenie obiektu
    Opis:
    The system which is developed in Department of Transport and Electrical Engineering UTH Rad. consists of collecting, analyzing and selecting data from existing observation units, and such to be installed in the future, including photo-radars, electronic fee collection and traffic monitoring cameras. The aim is tracking of objects distinguished by certain visual features. The present paper specifies the road net on chosen area and further, algorithms for the prediction of the continuations of vehicle tracks registered by the system are on consideration and assessed.
    Działanie opracowywanego na Wydziale Transportu i Elektrotechniki UTH Rad. systemu poszukiwania pojazdów drogowych polega na kolekcji, analizie i selekcji danych uzyskanych z różnorodnych istniejących, a także dodatkowo zainstalowanych jednostek obserwacyjnych takich jak fotoradary, kamery monitorujące ruch uliczny lub bramki służące do automatycznego poboru opłat. Celem jest śledzenie obiektów o zadanych cechach dystynktywnych. W niniejszym artykule sprecyzowano sieć dróg na zadanym obszarze, a następnie rozpatrywane i oceniane są algorytmy predykcji dalszych tras obiektów – pojazdów drogowych, które zostały zanotowane przez system.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 915-918, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the HDR imaging in vehicles’ video tracking systems
    Autorzy:
    Mazurek, P.
    Okarma, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/393309.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    lokalizacja pojazdów
    inteligentne systemy transportowe
    ITS
    High Dynamic Range Images
    HDRI
    vehicles tracking
    intelligent transport system (ITS)
    high dynamic range images
    Opis:
    Video systems are used in Intelligent Transportation Systems for vehicles’ tracking. Cameras typically used in these systems are characterized by relatively low dynamic range which is only a fragment of the dynamic range of the human eye. In order to adapt to the lighting conditions the cameras feature dynamic changes of the gain and exposure. For vehicles there is a very wide range of the observed brightness of details because of the variety of vehicles’ colors and the presence of elements reflecting light in different ways, as well as changing lighting conditions. This means that even if the camera is able to capture the relevant dynamic range, there is a restriction of the distinguishability of details, which is essential in the process of detecting the location of vehicles. The use of HDR imaging techniques based on various exposures helps to increase the dynamic range and improves the accuracy of vehicles’ positions estimation.
    Źródło:
    Archives of Transport System Telematics; 2010, 3, 4; 32-36
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lyapunov stability based sliding mode observer for sensorless control of permanent magnet synchronous motor
    Autorzy:
    Navaneethan, Soundirarajan
    Kanthalakshmi, Srinivasan
    Aandrew Baggio, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173640.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicles
    permanent magnet synchronous motor
    sensorless control
    sliding mode observer
    Lyapunov stability
    tracking efficiency
    pojazdy elektryczne
    silnik synchroniczny z magnesami trwałymi
    sterowanie bezczujnikowe
    obserwator o ślizgowym trybie pracy
    stabilność Lapunova
    wydajność śledzenia
    Opis:
    In recent years there has been an increasing demand for electric vehicles due to their attractive features including low pollution and increase in efficiency. Electric vehicles use electric motors as primary motion elements and permanent magnet machines found a proven record of use in electric vehicles. Permanent magnet synchronous motor (PMSM) as electric propulsion in electric vehicles supersedes the performance compared to other motor types. However, in order to eliminate the cumbersome mechanical sensors used for feedback, sensorless control of motors has been proposed. This paper proposes the design of sliding mode observer (SMO) based on Lyapunov stability for sensorless control of PMSM. The designed observer is modeled with a simulated PMSM model to evaluate the tracking efficiency of the observer. Further, the SMO is coded using MATLAB/Xilinx block models to investigate the performance at real-time.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140353
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tracking control and robustness study of shifting process
    Autorzy:
    Zhao, X.
    Guan, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/223502.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy vehicles
    automatic transmission
    shift quality
    PID tracking control
    Monte Carlo method
    pojazdy ciężkie
    skrzynia automatyczna
    zmiana wytrzymałości
    proces kontroli
    metoda Monte Carlo
    Opis:
    Heavy dump vehicles are usually working with big load changes and bad work environment, thus change the friction performance of transmission clutches, as well as great affect the shift quality seriously, which influence the vehicle performance. Many researchers developed a lot to design a useful automatic transmission control system. Using PID tracking control and Monte Carlo method, the controller based on an dynamic model was set up to analyze the shifting process of automatic transmission and its robustness in this paper. The shift process was divided into four stages, low-gear phase, torque phase, inertia phase and high-gear phase. The model presents the process from the first gear to the second gear when the torque has big change. Since the jerk and the friction work of clutch are both related to the speed of clutch which was easier to control, it was chose as the target to control the oil pressure for satisfying the requirement of shift quality. The simulation software, Maplesim and Simulink, were used to build the vehicle model and shifting controller for simulation under different working conditions, and the maximum jerk was changed from 34 m/s3 to 12 m/s3 after the optimization. In this paper the Monte Carlo has been used to quantize and evaluate the robustness of the closed-loop system for the friction coefficients and output torque of turbine variation leading by the friction feature parameters and throttle angle changed. Monte Carlo method was used to analyze the effectiveness and robustness of PID controller, which proves that it has good control effect when the throttle is ongoing minor fluctuations. When the throttle is full opening, a quadratic optimal controller based on disturbance is designed by the method of multi-objective optimization. When it changes within 20 percent, PID controller was designed under the guidance of tracking thoughts. The results also show that the controller could still obtain better effect when the friction coefficient ranged from -40 % to 40 % as well as engine torque changed from -20 % to 20 %, which indicates the robustness of controller.
    Źródło:
    Archives of Transport; 2018, 46, 2; 97-104
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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