| 摘要 |
A pad-type journal bearing that utilizes both tiltable pads and flexible pads for controlling the vibrations of a relatively high speed shaft. The tiltable pads are arranged in a generally conventional manner and tilt in response to rotation and vibrations of the shaft. The flexible pads are interposed between the tiltable pads and the shaft. The radius of curvature of the inner surface of the flexible pads is slightly larger than the radius of curvature of the shaft, and the radius of curvature of the outer surface of the flexible pads is slightly larger than the radius of curvature of the adjacent inner surface of the tiltable inner pad. The radial thickness of the flexible pads is slightly smaller than the radial distance between the shaft and the inner surface of the tiltable pads. The bearing is flood lubricated. Vibrations of the shaft are transmitted as dynamic loads through the hydrodynamic oil film to the flexible pads. Due to the pad construction and beam-type support, the flexible pads deflect in the central portion when subjected to a load from the shaft weight and/or dynamic loads as from shaft vibration. Vibrations of the flexible pads alternately squeeze and expand a pocket of oil in the space between the flexible pad outer surface and the adjacent inner surface of the tilting pad to provide "squeeze film" damping. Thus this bearing design uniquely provides tilting action, beam-type support flexibility, and squeeze film damping for the control of vibrations of high speed rotors.
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