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    Wyświetlanie 1-3 z 3
    Tytuł:
    Implementation and Analysis of Mathematical Modeled Drive Train System in Type III Wind Turbines Using Computational Fluid Dynamics
    Autorzy:
    Kabat, Subash Ranjan
    Panigrahi, Chinmoy Kumar
    Ganthia, Bibhu Prasad
    Barik, Subrat Kumar
    Nayak, Byamakesh
    Powiązania:
    https://bibliotekanauki.pl/articles/2022489.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    type III wind turbines
    gear train
    pitch control
    gear ratio
    pitch angle
    yaw system
    angular velocity
    CFD
    Opis:
    This paper is based on designing a modified rotor for a drivetrain in a Type-III wind turbine system for maximum power generation to work effectively under low and high wind speed and its variation. In this paper three drive trains are designed for the gearbox to provide regulated torque and thrust force. For time to time variation in wind speed the voltage sag and during over speed condition voltage swell problem can be solved by using this modified design. The pitch control, gear box and yaw of the wind turbine basically focused for modification. Mainly the gear box for the rotor causes sluggish motion of the rotor during low wind speed. This paper explained the design of modified rotor control for the gear box in DFIG based (Type-III) wind turbine. Also in this paper how the modified rotor system can be helpful for reactive power control highlighted with comparison with existing models. For designing MATLAB Simulink platform is taken and validated using CFD mechanical design analysis. Using these types of modified drive trains maximum power for the wind turbines is enhanced by 40–60% of its reference value.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 1; 180-189
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical analysis of asymmetric mesio-distal molar positions loaded by a symmetric cervical headgear
    Autorzy:
    Kizilova, N.
    Geramy, A.
    Romashov, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/307374.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metoda elementów skończonych
    FEM
    system docisku
    asymetria
    ortodoncja
    finite element method
    force system
    asymmetry
    Yaw Moment
    orthodontic tooth movement
    headgear
    Opis:
    Purpose: The plane 2d model and 3d finite element model of the headgear attached to two molars with different mesio-distal location are studied to show the asymmetric mechanical effects produced by symmetrically loaded headgear. In daily dental practice the asymmetrical location of molars is usually ignored. Methods: Six 3D finite element models of a symmetric cervical headgear were designed in SolidWorks 2011. The models showed symmetric molar position (model 1), 0.5 to 2 mm of anterior-posterior molar difference (models 2-5) and a significant asymmetry with 10 mm of difference in the locations (model 6). The head gear was loaded with 3N of force applied at the cervical headgear. The forces and moments produced on terminal molars are assessed. Results: It is shown the difference between the forces acting at the longer and shorter outer arms of the headgear increases with increase in the distance. The significant numeric difference in the forces has been found: from 0.0082 N (model 1) to 0.0324 N (model 5) and 0.146 N (model 6). These small forces may produce unplanned distal tipping and rotation of the molars around their vertical axes. The most important funding was found as a clockwise yaw moment in the system when is viewed superio-inferiorly. The yaw moment has been computed between -0.646 N•mm (model 1) and -1.945 N•mm (model 5). Conclusions: Therefore even small asymmetry in location of molars loaded by a symmetric cervical headgear will produce undesirable move-ment and rotation of the teeth that must be taken into account before applying the treatment.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 4; 97-106
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of micro-electromechanical inertial measurement units for unmanned aerial vehicle applications
    Autorzy:
    Mammadov, Aftandil
    Powiązania:
    https://bibliotekanauki.pl/articles/2203076.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    unmanned aerial vehicles
    inertial measurement unit
    gyroscope
    accelerometer
    micro electro-mechanical system
    roll
    pitch
    yaw
    acceleration
    bezzałogowe pojazdy powietrzne
    inercyjna jednostka pomiarowa
    żyroskop
    przyspieszeniomierz
    system mikro-elektromechaniczny
    rolka
    nachylenie
    przyśpieszenie
    Opis:
    Typically, an inertial navigation system (INS) is used to determine the position, speed, and orientation of an object moving relative to the earth's surface. The navigation information (position, speed and orientation) of an unmanned aerial vehicle (UAV) is needed to control its flight. Since the resistance of INS to interferences is very high, it is possible to ensure reliable flights in conditions of high-intensity noise. This article explores the principles of constructing inertial measurement units (IMU) that are part of the INS and indicates perspective directions for their development. Micro-electromechanical inertial measurement units were studied in this work, and functional and principal electrical circuits for connecting units of inertial measurements to the microcontroller were developed. The results of practical measurements of units without calibration and after calibration were obtained using the created laboratory device. Based on the obtained results, the necessity of sensor calibration was revealed, and accuracy was improved by performing calibration with the Kalman filter algorithm. The Kalman filter is the heart of the navigation system. In a low-cost system, IMU errors like bias, scale factor error and random walk noise dominate the INS error growth.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 117; 129--138
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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