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Wyświetlanie 1-3 z 3
Tytuł:
FPGA Based Active Magnetic Bearings Controller
Autorzy:
Kulesza, Z. S.
Powiązania:
https://bibliotekanauki.pl/articles/387274.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
sterownik
łożysko magnetyczne
controller
magnetic bearing
Opis:
The article discusses main problems of implementing the PID control law in the FPGA integrated circuit. Consecutive steps of discretizing and choosing the fixed-point representation of the continuous, floating-point PID algorithm are described. The FPGA controller is going to be used in the active hetero-polar magnetic bearings system consisting of two radial and one axial bearings. The results of the experimental tests of the controller are presented. The dynamic performance of the controller is better when compared with the dSPACE controller, that was used so far. The designed hardware and software, the developed implementation procedure and the experience acquired during this stage of the whole project are going to be used during the implementation of more sophisticated control laws (e.g. robust) in the FPGA for AMB controllers.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 2; 59-64
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rotor Crack Detection Approach Using Controlled Shaft Deflection
Autorzy:
Kulesza, Z. S.
Powiązania:
https://bibliotekanauki.pl/articles/386800.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
dynamika
diagnostyka
wirnik
pęknięcie
rotor dynamics
shaft crack
strucutre health monitoring
Opis:
Rotating shafts are important and responsible components of many machines, such as power generation plants, aircraft engines, machine tool spindles, etc. A transverse shaft crack can occur due to cyclic loading, creep, stress corrosion, and other mechanisms to which rotating machines are subjected. If not detected early, the developing shaft crack can lead to a serious machine damage resulting in a catastrophic accident. The article presents a new method for shaft crack detection. The method utilizes the coupling mechanism between the bending and torsional vibrations of the cracked, non/rotating shaft. By applying an external lateral force of a constant amplitude, a small shaft deflection is induced. Simultaneously, a harmonic torque is applied to the shaft inducing its torsional vibrations. By changing the angular position of the lateral force application, the position of the deflection also changes opening or closing of the crack. This chang/ es the way the bending and torsional vibrations are being coupled. By studying the coupled lateral vibration response for each angular position of the lateral force one can assess the possible presence of the crack. The approach is demonstrated with a numerical finite element model of a rotor. The results of the numerical analysis demonstrate the potential of the suggested approach for effective shaft crack detection.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 4; 32-40
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical Analysis for a New Tennis Ball Launcher
Autorzy:
Wójcicki, K.
Puciłowski, K.
Kulesza, Z. S.
Powiązania:
https://bibliotekanauki.pl/articles/386374.pdf
Data publikacji:
2011
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
wyrzutnia
trajektorie
analiza matematyczna
launcher
trajectories
mathematical analysis
Opis:
The paper presents the mathematical analysis for the design of a new tennis ball launcher in order to assess the possibilities for its technical implementation. First, traditional launchers are described. Next, several new requirements improving training possibilities of such machines are suggested. The motion equation of the flying tennis ball is formulated and numerically solved. This makes it possible to analyze the trajectories of the ball for different initial conditions: elevation and heading angles, as well as the rollers angle. Then, the mathematical analysis of the launcher with two counter rotating rollers is presented. Stiffness (Young's) modulus and friction coefficients for the typical tennis ball have been determined ex-perimentally. Based on these, initial conditions for the throw have been found: rotating speeds of the rollers and powers of the driving motors.
Źródło:
Acta Mechanica et Automatica; 2011, 5, 4; 110-119
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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