A Pressure Dam Bearing Analysis with Adiabatic Thermal Effects©

To improve the stability of fixed geometry journal bearings in high-speed rotating machinery, pressure dam or stepped bearings have often been used in place of plain or other bearings. Despite their long history and wide range of applications in industry, only isoviscous analyses have been reported in the literature. Since stability problems usually occur at relatively high speeds where considerable heating occurs, it is desirable to include the thermal effects in pressure dam bearing analysis. This study presents a full adiabatic thermohydrodynamic analysis for pressure dam bearings. The theoretical results show that the pressure and temperature distributions on a stepped pad are quite different from those on a smooth pad. The thermal effects have significant influence on the predicted bearing performance, such as journal eccentricity, dynamic coefficients, and rotor stability. The example of a flexible rotor indicates improved stability prediction with the thermal effects included.     

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Influence of Journal Speed and Load on the Static Operating Characteristics of a Tilting-Pad Journal Bearing with Ball-and-Socket Pivots

Results are described for experiments aimed at determining the effects of increased speed and load on ball-and-socket pivots in tilting-pad journal bearings. Experimental measurements of journal static operating position were made for a 70-mm (2.75-in.), five-pad tilting-pad journal bearing with ball-and-socket pivots. Testing consisted of journal rotational speeds from 1650 to 7840 rpm and bearing static loads as high as 4.45 kN (1000 lbs). These speeds and loads were sufficient to attain a range of heat generation and pivot thermal growths. Results showed that at low speeds substantial cross-coupling effects were present. However, with increased heat generation at elevated speeds and loads, these cross-coupling effects were significantly reduced.