Scuffing damage was found on Space Shuttle Power Drive Unit gears for the Rudder Speed Brake. Scuffing simulation tests rule out a predicted scuffing scenario. Scuff initiation is caused by tooth interference under unique transient high speed and torque conditions. Simulation tests for subsequent operation following a scuffing event show limited wear much less than the thickness of the gear case hardened layer.
Simulation of Space Shuttle Gear Performance
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Kratz, SH, Wedeven, LD, Black, WF, Carlisle, DJ, & Wedeven, GG. "Simulation of Space Shuttle Gear Performance." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 1. Washington, D.C., USA. September 12–16, 2005. pp. 897-898. ASME. https://doi.org/10.1115/WTC2005-64297
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