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Effect of pad offset on the stability of Jeffcott rotor operating in tilting 4-pad journal bearings

Strzelecki S., Socha Z., Towarek Z., Zakrzewski S.

Vibrations in Physical Systems

2014

Vol. 26

273--280

Tilting-pad journal bearings are applied in high-speed rotor systems. Excellent stability properties allow obtaining the reliable, vibration free, operation of bearings and rotor. There is still need for better knowledge of such bearings static and dynamic characteristics. In case of tilting-pad journal bearings the stability can be evaluated by the system damping. The system damping gives the damping reserve of the bearings-rotor system and can be obtained by the solution of basic hydrodynamic and rotor motion equations. In this paper the hydrodynamic equations were solved by means of finite difference method. As result, the dynamic characteristics of bearings in form of stiffness and damping coefficients were obtained. These coefficients were the basis for the determination of the system damping.

Research on rotary system with tilting-pad journal bearings

Vekteris V., Cereska A.

Archive of Mechanical Engineering

2008

Vol. LV, nr 1

5-12

This paper presents the results of research on self-vibrations of rotary systems with segmental tilting-pad journal bearings having different frequencies of rotor revolution. The problem of research formulated in this work concerns technical characteristics of primary elements of the investigated system and its principle of operation. The obtained results are illustrated with graphs. The paper also contains comparison of results and discussion. General conclusions are given at the end of the paper.

W pracy przedstawiono wyniki badań drgań własnych w systemach obrotowych z segmentowymi łożyskami ślizgowymi, pracującymi przy różnych częstotliwościach obrotów wirnika. Sformułowano problem badawczy, który dotyczy charakterystyk technicznych podstawowych elementów badanego systemu i jego zasady działania. Uzyskane wyniki zilustrowano wykresami. W pracy zamieszczono także porównanie wyników i dyskusję. Ogólne wnioski sformułowano w końcowej części artykułu.