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Rubbing between a rotor and a stator causes the characteristics vibration to the rotating machinery. Rubbing mainly occurs at the seal part and the blade tips. Since many sort of materials are used on the seals, the friction between a rotor and seals have also various coefficients. In case of the high friction coefficients it is easy to induce the backward whirl by the rubbing, while in case of the low friction coefficients the backward whirl may not be caused in spite of existing of the rubbing. The narrower the whirl orbit, the greater the contact force is. In this paper, these behaviors are confirmed experimentally and theoretically.

Vibration Behavior of Rotating Machinery with Rubs (The Effects of Casing Materials on Vibrations)