Wyniki wyszukiwania - BazTech

1

Mathematical modelling of oil film bearing

Kucera P., Malenovsky E., Pochyly F.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2003

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nr 21

147-152

EN

The problem is mathematical modelling of oil film bearing at the rotary system. The new access comes from Navier-Stokes equation of fluid, supported by equation of continuity and Bezier's body. In this article is note the solution of mathematical model of fluid film bearing by perpendicular and especially by non-dimensional coordinates. There was inserted modelling problem in this article, in which we are modelling the trajectory of centre of the shaft under fluid film bearing, where the count have been carried by non-dimensional coordinates.

2

Consideration of the character of excited vibration of rotor systems with disk-housing impacts

Zapomel J., Malenovsky E.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2000

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nr 13

353-356

EN

Excessive lateral vibration results into impacts of the rotor on the stationary part. In this case the motion can have an unpredictable character. For its consideration forms of the nodes trajectories, Fourier spectrum, Poincare maps, attractor dimension and other means are possible to be applied.

PL

Nadmierne drgania poprzeczne wywołujące uderzenia wirnika o część nieruchomą powodują, że ruch może mieć charakter nieprzewidywalny. Do zbadania charakteru drgań wzbudzonych zastosowano m.in. metodę kształtu trajektorii węzłów, transformatę Fouriera, mapę Poincarego.

3

Numerical investigation of rotors supported by nonlinear bearings using Newton's theory

Zapomel. J., Malenovsky E.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1999

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z. 11

83-86

EN

One way of incorporation of impacts into computational models of rotor systems is to use the Newton's theory (impacts of absolutely rigid bodies ). Then the eąuation of motion becomes nonlinear. For its solution some numerical method of "step by step" type can be used but its basic algorithm must be modified to consider discontinuous changes of kinematic parameters when impacts occur.

PL

Jednym ze sposobów uwzględnienia zderzeń w modelu obliczeniowym jest użycie klasycznej teorii Newtona (zderzenia ciał doskonale sztywnych). Równanie ruchu dla takiego modelu obliczeniowego staje się nieliniowe. Do jego rozwiązania może być użyta jedna z metod numerycznego całkowania. Podstawowy algorytm tej metody trzeba odpowiednio zmienić tak, aby uwzględniał on nieciągłą zmianę parametrów kinematycznych momencie zderzenia.

4

Vibration measurement of electrical machines

Veselka F., Ondrusek C., Malenovsky E.

Prace Naukowe Politechniki Warszawskiej. Elektryka

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1999

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z. 111

424-427

EN

Single - phase commutator machines are usualy working in high speed and therefore the vibration analysis becomes to be very important. It has been observed, that the machine resonance range should be under the nominal speed and therefore the problems of starting procedure increase. The contribution deals with a problem of single - phase AC commutator motor mechanical resonance. The magnolie forces between slator and rotor were taken into consideration during analysis. The relation between forces of magnetic origin and of excitation current and nonuniform air - gap between the poles and rotor surface was analysed.