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Vertically reciprocating augerThe mathematical model and test results developed for the Vertically Reciprocating Auger (VRA) are summarized. The VRA is a device capable of transporting cuttings that result from below surface drilling. It was developed chiefly for the lunar surface, where conventional fluid flushing while drilling would not be practical. The VRA uses only reciprocating motion and transports material through reflections with the surface above. Particles are reflected forward and land ahead of radially placed fences, which prevent the particles from rolling back down the auger. Three input wave forms are considered to drive the auger. A modified sawtooth wave form was chosen for testing, over a modified square wave or sine wave, due to its simplicity and effectiveness. The three-dimensional mathematical model predicted a sand throughput rate of 0.2667 pounds/stroke, while the actual test setup transported 0.075 pounds/stroke. Based on this result, a correction factor of 0.281 is suggested for a modified sawtooth input.
Document ID
19900015142
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Etheridge, Mark (Georgia Inst. of Tech. Atlanta, GA, United States)
Morgan, Scott (Georgia Inst. of Tech. Atlanta, GA, United States)
Fain, Robert (Georgia Inst. of Tech. Atlanta, GA, United States)
Pearson, Jonathan (Georgia Inst. of Tech. Atlanta, GA, United States)
Weldi, Kevin (Georgia Inst. of Tech. Atlanta, GA, United States)
Woodrough, Stephen B., Jr. (Georgia Inst. of Tech. Atlanta, GA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1988
Subject Category
Engineering (General)
Report/Patent Number
ME-4182
NAS 1.26:182822
NASA-CR-182822
Accession Number
90N24458
Funding Number(s)
CONTRACT_GRANT: NGT-21-002-800
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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