The instantaneous efficiency of an epicyclic gear rotary actuator is an important factor in sizing flight control systems where compound epicyclic gear trains are typically used. The efficiency variation can be smooth or fluctuating depending on the combination and timing of the teeth of ring, planet, and sun gears. In this paper, the instantaneous efficiency characteristics of synchronous and nonsynchronous actuators under forward-driving with opposing load and reverse-driving with aiding load are investigated. The emphasis will be on instantaneous, rather than average efficiency of gears. Several gear arrangements are considered: external and internal gears, simple planetary gears and compound planetary gears. Efficiency will be discussed considering not only the geometry of the mating gears, but also the relative phasing of the planet gears relative to the sun and ring gears. Synchronous compound epicyclic gears are shown to have large fluctuation in their instantaneous efficiency. When reverse-driving efficiency falls below 0%, the unit cannot be back-driven and will chatter. Nonsynchronous compound gears have a smaller variation in instantaneous efficiency. However, extra care must be taken in timing the compound planet gears, as well as clocking position of compound planet gears relative to ring gears and the sun gear.
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The Instantaneous Efficiency of Epicyclic Gears in Flight Control Systems
Anngwo Wang,
Anngwo Wang
MOOG Inc. Aircraft Group, Torrance, CA 90501 e-mail:
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Seth Gitnes,
Seth Gitnes
MOOG Inc. Aircraft Group, Everett, WA 98204 e-mail:
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Lotfi El-Bayoumy
Lotfi El-Bayoumy
MOOG Inc. Aircraft Group, Torrance, CA 90501 e-mail:
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Anngwo Wang
MOOG Inc. Aircraft Group, Torrance, CA 90501 e-mail:
Seth Gitnes
MOOG Inc. Aircraft Group, Everett, WA 98204 e-mail:
Lotfi El-Bayoumy
MOOG Inc. Aircraft Group, Torrance, CA 90501 e-mail:
J. Mech. Des. May 2011, 133(5): 051008 (11 pages)
Published Online: June 8, 2011
Article history
Received:
May 3, 2010
Revised:
April 7, 2011
Online:
June 8, 2011
Published:
June 8, 2011
Citation
Wang, A., Gitnes, S., and El-Bayoumy, L. (June 8, 2011). "The Instantaneous Efficiency of Epicyclic Gears in Flight Control Systems." ASME. J. Mech. Des. May 2011; 133(5): 051008. https://doi.org/10.1115/1.4004001
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