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Using guided balls to auto-balance rotors
Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
2002 (English)In: Journal of engineering for gas turbines and power, ISSN 0742-4795, Vol. 124, no 4, 971-975 p.Article in journal (Refereed) Published
Abstract [en]

By using balancing balls constrained to move in a circular groove filled with oil, the vibration of rotating machinery can, under certain circumstances, be reduced. This paper shows that the damping from the oil reduces the instability region, i.e., the conditions when the balancing balls don't find their equilibrium positions. However, the instability region seems to increase with increasing number of balancing balls. The critical ball damping ratio is highest just above the natural frequency and then rapidly decreases. Consequently, since the region between instability and critical damping is quite small, the ball damping should be made as small as possible without getting too close to the instability threshold. Bearing damping has a large effect on the instability region. High bearing damping will suppress the instability. The time it takes to reach the asymptotically stable position seems to increase with increasing number of balls. Keeping this time low is one of the most important things when designing a balancing ring.

Place, publisher, year, edition, pages
2002. Vol. 124, no 4, 971-975 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-46899DOI: 10.1115/1.1479335OAI: diva2:267795
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-13

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Wettergren, Håkan
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