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    Wyświetlanie 1-13 z 13
    Tytuł:
    Motion vector estimation of a stereovision camera with inertial sensors
    Autorzy:
    Pełczyński, P.
    Ostrowski, B.
    Rzeszotarski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/221704.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    passive navigation
    motion vector
    disparity
    feature points
    Opis:
    The aim of the presented work was the development of a tracking algorithm for a stereoscopic camera setup equipped with an additional inertial sensor. The input of the algorithm consists of the image sequence, angular velocity and linear acceleration vectors measured by the inertial sensor. The main assumption of the project was fusion of data streams from both sources to obtain more accurate ego-motion estimation. An electronic module for recording the inertial sensor data was built. Inertial measurements allowed a coarse estimation of the image motion field that has reduced its search range by standard image-based methods. Continuous tracking of the camera motion has been achieved (including moments of image information loss). Results of the presented study are being implemented in a currently developed obstacle avoidance system for visually impaired pedestrians.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 141-150
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Algorithm for Interpolating Ship Motion Vectors
    Autorzy:
    Hu, Q.
    Cai, F.
    Yang, C.
    Shi, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/116863.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Ship Motion
    Ship Motion Vector
    Automatic Identification System (AIS)
    AIS Dynamic Information
    Algorithm, Ship's Acceleration
    AIS Data
    Vector Function
    Opis:
    Interpolation of ship motion vectors is able to be used for estimating the lost ship AIS dynamic information, which is important for replaying marine accidents and for analysing marine traffic data. The previous methods can only interpolate ship’s position, while not including ship's course and speed. In this paper, vector function is used to express the relationship between the ship’s time and space coordinates, and the tangent of the vector function and its change rate are able to express physical characteristics of ship’s course, speed and acceleration. The given AIS dynamic information can be applied to calculate the parameters of ship's vector function and then the interpolation model for ship motion vectors is developed to estimate the lost ship dynamic information at any given moment. Experiment results show that the ship motion vector function is able to depict the characteristics of ship motions accurately and the model can estimate not only the ship’s position but also ship’s course and speed at any given moment with limited differences.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2014, 8, 1; 35-40
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie parametrów ruchu statków na podstawie obserwacji ARPA i AIS
    Ship movement parameters compare based on ARPA and AIS observation
    Autorzy:
    Stupak, T.
    Wąż, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/316106.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    wektor ruchu
    ruch statku
    Systemu Automatycznej Identyfikacji Statków
    AIS
    ARPA
    motion vector
    ship traffic
    Automatic Ship Identification System
    Opis:
    W artykule przedstawiono badania wektora ruchu prowadzone w laboratorium radarowym Akademii Morskiej w Gdyni, oraz podczas rejsów na statkach. Badano dokładność wyznaczenia położenia statku, kursu, prędkości i odległości najmniejszego zbliżenia wykorzystując radary statkowe oraz dane z Systemu Automatycznej Identyfikacji. Stwierdzono, że dokładność wyznaczania badanych parametrów jest większa niż narzucają wymagania Międzynarodowej Organizacji Morskiej.
    This article presents the movement vector research conducted in the radar laboratory of Gdynia Maritime University and during vessel cruises. The precision of designating the vessels' location, course, speed and CPA were researched using on-baord radars and AIS data. It is concluded that the precision of designating the researched parameters is greater than the International Maritime Organization requires.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2017, 18, 12; 438-441, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real time motion compensation technology based on least square support vector machine prediction
    Autorzy:
    Song, Zhehan
    Feng, Huajun
    Xu, Zhihai
    Li, Qi
    Powiązania:
    https://bibliotekanauki.pl/articles/2086762.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    motion compensation
    motion prediction
    dual-resolution camera system
    least square support vector machine
    Opis:
    When cameras are used in aerial photography, satellite imaging or other scenes, the motion of the observational target causes image blur. The corresponding motion compensation systems often present some response delay. Thus, we introduce effective and fast motion prediction for the target to achieve steady real-time motion compensation. We first analyze the target motion states to propose a fast and robust prediction method based on the least square support vector machine algorithm. Then, we evaluate the performance between ours and other state-of-the-art methods through experiments. Experimental results confirm that the proposed method provides a fast and robust prediction for target motion. At last, we embed our method with dual-resolution camera system to perform high-quality motion compensation effect in real time.
    Źródło:
    Optica Applicata; 2022, 52, 2; 259--272
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Medium- and long-term prediction of polar motion using weighted least squares extrapolation and vector autoregressive modeling
    Autorzy:
    Lei, Yu
    Zhao, Danning
    Guo, Min
    Powiązania:
    https://bibliotekanauki.pl/articles/27314482.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Centrum Badań Kosmicznych PAN
    Tematy:
    polar motion
    prediction model
    weighted least squares
    vector autoregressive
    Opis:
    This article presents the application of weighted least squares (WLS) extrapolation and vector autoregressive (VAR) modeling in polar motion prediction. A piecewise weighting function is developed for the least squares (LS) adjustment in consideration of the effect of intervals between observation and prediction epochs on WLS extrapolation. Furthermore, the VAR technique is used to simultaneously model and predict the residuals of xp, yp pole coordinates for WLS misfit. The simultaneous predictions of xp, yp pole coordinates are subsequently computed by the combination of WLS extrapolation of harmonic models for the linear trend, Chandler and annual wobbles, and VAR stochastic prediction of the residuals (WLS+VAR). The 365-day-ahead xp, yp predictions are compared with those generated by LS extrapolation+univariate AR prediction and LS extrapolation+VAR modeling. It is shown that the xp, yp predictions based on WLS+VAR taking into consideration both the interval effect and correlation between xp and yp outperform those generated by two others. The accuracies of the xp predictions are 13.97 mas, 18.47 mas, and 20.52 mas, respectively for the 150-, 270-, and 365-day horizon in terms of the mean absolute error statistics, 36%, 24.8%, and 33.5% higher than LS+AR, respectively. For the yp predictions, the 150-, 270-, and 365-day accuracies are 15.41 mas, 21.17 mas, and 21.82 mas respectively, 27.4%, 11.9%, and 21.8% higher than LS+AR respectively. Moreover, the absolute differences of the WLS+VAR predictions and observations are smaller than the differences from LS+VAR and LS+AR, which is practically important to practical and scientific users, although the improvement in accuracies is no more than 10% relative to LS+VAR. The further comparison with the predictions submitted to the 1st Earth Orientation Parameters Prediction Comparison Campaign (1st EOP PCC) shows that while the accuracy of the predictions within 30 days is comparable with that by the most accurate prediction techniques including neural networks and LS+AR participating in the campaign for xp, yp pole coordinates, the accuracy of the predictions up to 365 days into the future are better than accuracies by the other techniques except best LS+AR used in the EOP PCC. It is therefore concluded that the medium- and long-term prediction accuracy of polar motion can be improved by modeling xp, yp pole coordinates together.
    Źródło:
    Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, 2; 42--55
    2083-6104
    Pojawia się w:
    Artificial Satellites. Journal of Planetary Geodesy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Direct Torque Control with Space Vector Modulation for Synchronous Reluctance Motor Motion Control Applications and a Comparison with Other Torque-Control Algorithms
    Autorzy:
    Vajsz, Tibor
    Számel, László
    Handler, Árpád
    Powiązania:
    https://bibliotekanauki.pl/articles/1193683.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    synchronous reluctance motor
    electric drive
    direct torque control
    space vector modulation
    frequency converter
    motion control
    current vector control
    industrial drives
    Opis:
    Motion control is facing an increasing popularity in the present research activities. Owing to the expected wide spreading of motion control applications, it can be predicted that the advancements in the field of electric motor drives will have a high level of influence on the new results in the field of motion control. The synchronous reluctance motor drives mean an excellent and yet cost-effective solution for actuators in motion control applications. In this article, the direct torque control with space vector modulation is analysed as a possible candidate for synchronous reluctance motor motion control applications. Its torque-control performance is investigated as a function of torque-control sample time, and a comparison of the torque ripples is made with other torque-control algorithms by an FFT analysis.
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 103-113
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A robust smooth controller for a unicycle-like robot
    Autorzy:
    Pazderski, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/229667.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transverse functions
    nonholonomic system
    control motion task
    Lie group
    navigation vector fields
    smooth feedbacks
    Opis:
    In this paper, a stabilizer dedicated for a unicycle-like robot is considered. The proposed smooth control law ensures the global boundedness of position and orientation trajectories to a neighbourhood of the desired point with an arbitrarily selected radius and it is robust to bounded additive measurement noises. The controller consists of a smooth hybrid navigation algorithm and a smooth feedback based on the transverse function approach. The stability proof, simulation and experimental results illustrating properties of the algorithm are discussed.
    Źródło:
    Archives of Control Sciences; 2018, 28, 1; 155-183
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the noncommutativity of submitting aircraft rotation in high-manoeuvring flights
    Autorzy:
    Szelmanowski, A.
    Borowski, J.
    Garbacz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/244401.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    transport
    aviation
    inertial navigation system
    coning motion
    noncommutativity rate vector
    lotnictwo
    Inercyjny system nawigacji
    Opis:
    The article presents selected results of the analytical work carried out in the Air Force Institute of Technology and the Polish Air Force Academy by means of a computer simulation of noncommutativity phenomena submitting aircraft turnover on high-manoeuvrability flights. The results of these simulations allowed to define the guidelines for the method of “production” of noncommutativity phenomenon in specialized rotating positions for strapdown inertial navigation systems (to evaluate the errors of determining spatial orientation). Also, it analysed the possibility of “production” noncommutativity rotational movement in mobile flight simulator used for testing pilots and candidates for pilots (to test the sensitivity of the pilot’s vestibular system in terms of feeling the impact of this phenomenon). The results of the assessment of “greatness” noncommutativity angular velocity vector, occurring in some parts of the high-manoeuvrability flight of aircraft on the example of a fighter-bomber airplane Su-22 were discussed as well.
    Źródło:
    Journal of KONES; 2017, 24, 1; 325-332
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Motion planning and feedback control for a unicycle in a way point following task: The VFO approach
    Autorzy:
    Michałek, M.
    Kozłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/929993.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    planowanie ruchu
    sterowanie zamknięte
    pole wektorowe
    unicycle
    way point following
    motion planning
    feedback control
    vector fields
    Opis:
    This paper is devoted to the way point following motion task of a unicycle where the motion planning and the closed-loop motion realization stage are considered. The way point following task is determined by the user-defined sequence of way-points which have to be passed by the unicycle with the assumed finite precision. This sequence will take the vehicle from the initial state to the target state in finite time. The motion planning strategy proposed in the paper does not involve any interpolation of way-points leading to simplified task description and its subsequent realization. The motion planning as well as the motion realization stage are based on the Vector-Field-Orientation (VFO) approach applied here to a new task. The unique features of the resultant VFO control system, namely, predictable vehicle transients, fast error convergence, vehicle directing effect together with very simple controller parametric synthesis, may prove to be useful in practically motivated motion tasks.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2009, 19, 4; 533-545
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Investigation of Direct Torque Control and Hysteresis Current Vector Control for Motion Control Synchronous Reluctance Motor Applications
    Autorzy:
    Vajsz, Tibor
    Számel, László
    Handler, Árpád
    Powiązania:
    https://bibliotekanauki.pl/articles/1193685.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    synchronous reluctance motor
    electric drive
    direct torque control
    current vector control
    frequency converter
    motion control
    industrial drives
    Opis:
    Synchronous reluctance motor drives are one of the most attractive alternatives of permanent magnet synchronous motor drives and induction motor drives in the field of conventional industrial and household applications. This tendency is expected to be continued in the case of motion control applications as well. This article investigates two torque-control algorithms that are possible candidates for motion control synchronous reluctance motor applications. The examined torque-control algorithms are direct torque control (DTC) and hysteresis current vector control (HCVC).
    Źródło:
    Power Electronics and Drives; 2019, 4, 39; 115-124
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena ruchu paliwa w procesie spalania na podstawie obrazu cyfrowego
    Assessment of fuel movement in combustion process based on the digital image
    Autorzy:
    Pater, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/408434.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    analiza ruchu na obrazie
    przemysł węglowy
    metoda różnic skończonych
    pola wektorowe
    image motion analysis
    coal industry
    finite difference methods
    vector fields
    Opis:
    Artykuł dotyczy sposobu wskazania rodzaju ruchu przy pomocy przetwarzania i analizy obrazu cyfrowego na przykładzie sekwencji przemieszczania się pyłu węglowego. Prezentowane podejście ma poszerzyć perspektywę zastosowania systemów wizyjnych w kontroli procesów spalania, podnosząc tym samym ich efektywność. Wyniki pokazały właściwe odzwierciedlenie rzeczywistego ruchu paliwa na dyskretnej powierzchni pól wektorowych przy zastosowaniu metody przepływu optycznego. Dołączenie metody numerycznej, do analizy pól wektorowych, pozwoliło wyznaczyć sześć rodzajów ruchu. Obserwacje, obejmujące fragmentu badanego zjawiska, wyczerpują wszystkie przypadki oceny przemieszczenia cząstek paliwa.
    The article refers to the method of indicating the type of movement by means the digital image processing and analysis on the example of a coal dust movement sequence. Presented approach is broaden the perspective of use the vision systems in the combustion processes control, thus increasing their effectiveness. The results showed a correct reflection of the real fuel movement in the discrete surface of the vector fields using the optical flow method. Including a numerical method for vector field analysis allowed to indicate six types of movement. Research, covering a fragment of the studied phenomenon, exhaust all cases of assessing the fuel particles displacement.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 2; 79-82
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Construction of the approximate stability equations of motion for an elastic cylindrical body under axial compressive load
    Autorzy:
    Banakh, I.
    Kolinko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/411449.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    elastic body
    stress tensor
    perturbation of displacement vector
    stability equations of motion
    standard material of the 2nd order
    compresive load
    Opis:
    A method of constructing nonlinear motion stability equations for isotropic elastic bodies is developed for cylindrical bodies of standard material of the 2nd order subjected to the action of “dead” axial compressive forces. The perturbation of the displacement vector is given by its approximate decomposition with respect to the base of tensor functions of the 1st, 2nd and 3d valences. The time-dependent tensor coefficients of the decomposition satisfy the system of ordinary differential equations. Based on the obtained equations one can investigate the balance stability of cylindrical bodies under various fixing conditions.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2014, 3, 4; 69-73
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent sensing and monitoring : respiratory motion prediction for tumor following radiotherapy
    Autorzy:
    Ichiji, K.
    Homma, N.
    Sakai, M.
    Bukovsky, I.
    Zhang, X.
    Osanai, M.
    Abe, M.
    Sugita, N.
    Yoshizawa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/91582.pdf
    Data publikacji:
    2012
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    intelligent sensing
    monitoring
    respiratory motion
    tumor
    radiotherapy
    time-varying seasonal autoregressive model
    TVSAR model
    multiple regression
    MR
    multilayer perceptron
    MLP
    support vector regression
    SVR
    Opis:
    This paper presents a medical application of the intelligent sensing and monitoring, a new lung tumor motion prediction method for tumor following radiation therapy. An essential core of the method is accurate estimation of complex fluctuation of time-varying periodical nature of lung tumor motion. Such estimation is achieved by using a novel multiple time-varying seasonal autoregressive (TVSAR) model in which several windows of different time-lengths are used to calculate correlation based fluctuation of periodic nature in the motion. The proposed method provides the prediction as a combination of those based on different window lengths. Multiple regression (MR), multilayer perceptron (MLP) and support vector regression (SVR) are used to combine and the prediction performances are evaluated by using clinical lung tumor motion. The proposed methods with the combined predictions showed high accurate prediction and are superior to the single different predictions. The average errors of MR, MLP, and SVR were 0.8455,0.8507, and 0.7530 mm at 0.5 s ahead, respectively. The results are clinically sufficient and thus clearly demonstrate that the proposed TVSAR with an appropriate combination method is useful for improving the prediction performance.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2012, 2, 4; 331-342
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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