Full Annular Rub in Mechanical Seals, Part I: Experimental Results

DONALD E. BENTLY ； JOHN J. YU ； PAUL GOLDMAN ； AGNES MUSZYNSKA

《International Journal of Rotating Machinery》 2002卷 (2002/12) Pp. 319-328

https://doi.org/10.1155/S1023621X02000301

摘要

This paper presents the results of recent experimental studies on rotor/seal full annular rub, including forward and reverse precession. It was found that reverse precessional full annular rub (dry whip) could occur repeatedly in small clearance cases without any outside disturbance. The rotor rubbed against the seal with almost constant amplitude and frequency, which was higher than the natural frequency of the original rotor system and lower than of that of the coupled rotor/seal system. Once generated, the reverse precessional rub could be sustained over the whole speed range as long as slippage was maintained. Radius-to-clearance ratio varied from 10 to 40. The experimental studies include forward rub jump phenomena, reverse rub triggering mechanism, and effects of mass unbalance, surface lubrication, shaft speed, and seal stiffness. The results of both forward and reverse precession are discussed in detail, with emphasis on the reverse and the transition from the forward to the reverse.

關鍵字

Rotor/seal rub ； Full annular rub ； Reverse precession ； Forward precession ； Self-excited vibration