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Evaluation of a High-Torque Backlash-Free Roller ActuatorThe results are presented herein of a test program that evaluated the stiffness, accuracy, torque ripple, frictional losses, and torque holding capability of a 16:1 ratio, 430 N-m (320 ft-lb) planetary roller drive for a potential space vehicle actuator application. The drive's planet roller supporting structure and bearings were found to be the largest contributors to overall drive compliance, accounting for more than half of the total. In comparison, the traction roller contacts themselves contributed only nine percent of the drive's compliance based on an experimentally verified stiffness model. The drive exhibited no backlash although 8 arc sec of hysteresis deflection were recorded due to microcreep within the contact under torque load. Because of these load-dependent displacements, some form of feedback control would be required for arc second positioning applications. Torque ripple tests showed the drive to be extremely smooth, actually providing some damping of input torsional oscillations. The drive also demonstrated the ability to hold static torque with drifts of 7 arc sec or less over a 24 hr period at 35 percent of full load.
Document ID
20020073836
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Steinetz, Bruce M.
(NASA Lewis Research Center Cleveland, OH United States)
Rohn, Douglas A.
(NASA Lewis Research Center Cleveland, OH United States)
Anderson, William
(NASTEC, Inc. Cleveland, OH United States)
Date Acquired
August 20, 2013
Publication Date
May 1, 1986
Publication Information
Publication: 20th Aerospace Mechanisms Symposium
Subject Category
Mechanical Engineering
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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