Abstract
The role of pivot stiffness on dynamic response is explored in a large stiffness range for tilting pad journal bearings in vertical and horizontal rotors. Two designs are compared: rigid pivot and disc spring set pivot. The latter is adjustable to vary from completely soft to almost rigid. Effect of journal unbalance is also discussed. It is shown that two threshold points of 0.1 and 10 are discovered for pivot stiffness ratio. Specific pivot stiffness at different intervals has totally different effects on orbits. In addition, another point exists as turning point for pivot stiffness ratio and results in the significant orbit peak. Further, pivot stiffness effect is sensitive to journal unbalance, particularly at the peak point.
Published Version
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