This paper discusses reverse full annular rub based on a two degree-of-freedom rotor/seal model where a rubbing location can be simulated away from the lumped rotor mass. The analytical model is much closer to the experimental setup for comparison of results, and real machines for analysis, than the previous one degree-of-freedom model. Its closed-form solution is given including reverse rub amplitudes and relative phases, as well as the normal contact force. The exact frequency equation in polynomial form yields reverse full annular rub frequencies without having to neglect any parameters. Many conclusions can be drawn directly from explicit expressions without numerical calculations. The solution with nonpositive normal contact force indicates a dry-friction whirl/whip-free region, usually accompanied by low friction and/or high damping. The analytical study covers both dry-friction whirl and dry-friction whip, and their relations with dry-friction factor, damping, and rotor speed. Range of reverse rub frequencies, their relation with rotor and rotor/seal coupled natural frequencies, and direction of frictional force, are also revealed. Destructive dry-friction whip experimental results are given, which have fully confirmed the analytical formulas.
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January 2012
Research Papers
On Occurrence of Reverse Full Annular Rub
John J. Yu
John J. Yu
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John J. Yu
J. Eng. Gas Turbines Power. Jan 2012, 134(1): 012505 (8 pages)
Published Online: November 7, 2011
Article history
Received:
April 17, 2011
Accepted:
May 1, 2011
Online:
November 7, 2011
Published:
November 7, 2011
Citation
Yu, J. J. (November 7, 2011). "On Occurrence of Reverse Full Annular Rub." ASME. J. Eng. Gas Turbines Power. January 2012; 134(1): 012505. https://doi.org/10.1115/1.4004161
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