Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse
Approved for public release; distribution is unlimited Prepared for The U.S. Antarctic Program is conducting a proof-of-concept traverse to haul heavy cargo 1600 km from McMurdo Station to South Pole Station. During the 2003–04 season (year two), the tractor-trains experienced poor mobility over und...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.205.3175 2023-05-15T13:59:46+02:00 Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse J. H. Lever J. C. Weale R. G. Alger G. L. Blaisdell November G. L. Blaisdell The Pennsylvania State University CiteSeerX Archives 2004 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.205.3175 http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR04-22.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.205.3175 http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR04-22.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR04-22.pdf text 2004 ftciteseerx 2016-01-07T17:36:27Z Approved for public release; distribution is unlimited Prepared for The U.S. Antarctic Program is conducting a proof-of-concept traverse to haul heavy cargo 1600 km from McMurdo Station to South Pole Station. During the 2003–04 season (year two), the tractor-trains experienced poor mobility over undisturbed snow on the Ross Ice Shelf. despite relatively low sled ski pressures and encouraging results of pre-departure tests conducted on the McMurdo Ice Shelf. To understand why, we conducted expedient mobility tests, snow-strength measurements, and snow-pit studies along 250-km of route as the traverse returned to McMurdo. The key phenomenon causing train immobility appears to be traction–slip–resistance feedback resulting from the sled skis riding in the ruts made by the towing tractors. We measured much lower towing resistance when the same sleds were towed over undisturbed snow outside of the tractor ruts. Large pitch and roll motions, and consequently large resistance peaks, also occurred when several sleds were towed in series. The role of snow strength was more difficult to assess. Hard sastrugi caused severe motions and sled breakdowns. Decreasing average strength towards the center of the Ross Ice Shelf agreed with qualitatively worsening mobility but quantitative results were inconclusive. Also, increased measured strength on the previously traveled trail was insufficient to account for improved Text Antarc* Antarctic Ice Shelf McMurdo Ice Shelf Ross Ice Shelf South pole South pole Unknown Antarctic McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) Ross Ice Shelf Sastrugi ENVELOPE(163.683,163.683,-74.617,-74.617) South Pole |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
Approved for public release; distribution is unlimited Prepared for The U.S. Antarctic Program is conducting a proof-of-concept traverse to haul heavy cargo 1600 km from McMurdo Station to South Pole Station. During the 2003–04 season (year two), the tractor-trains experienced poor mobility over undisturbed snow on the Ross Ice Shelf. despite relatively low sled ski pressures and encouraging results of pre-departure tests conducted on the McMurdo Ice Shelf. To understand why, we conducted expedient mobility tests, snow-strength measurements, and snow-pit studies along 250-km of route as the traverse returned to McMurdo. The key phenomenon causing train immobility appears to be traction–slip–resistance feedback resulting from the sled skis riding in the ruts made by the towing tractors. We measured much lower towing resistance when the same sleds were towed over undisturbed snow outside of the tractor ruts. Large pitch and roll motions, and consequently large resistance peaks, also occurred when several sleds were towed in series. The role of snow strength was more difficult to assess. Hard sastrugi caused severe motions and sled breakdowns. Decreasing average strength towards the center of the Ross Ice Shelf agreed with qualitatively worsening mobility but quantitative results were inconclusive. Also, increased measured strength on the previously traveled trail was insufficient to account for improved |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. H. Lever J. C. Weale R. G. Alger G. L. Blaisdell November G. L. Blaisdell |
spellingShingle |
J. H. Lever J. C. Weale R. G. Alger G. L. Blaisdell November G. L. Blaisdell Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse |
author_facet |
J. H. Lever J. C. Weale R. G. Alger G. L. Blaisdell November G. L. Blaisdell |
author_sort |
J. H. Lever |
title |
Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse |
title_short |
Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse |
title_full |
Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse |
title_fullStr |
Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse |
title_full_unstemmed |
Mobility of Cargo Trains during Year Two of the Proof-of-Concept South Pole Traverse |
title_sort |
mobility of cargo trains during year two of the proof-of-concept south pole traverse |
publishDate |
2004 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.205.3175 http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR04-22.pdf |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) ENVELOPE(166.667,166.667,-77.850,-77.850) ENVELOPE(163.683,163.683,-74.617,-74.617) |
geographic |
Antarctic McMurdo Ice Shelf McMurdo Station Ross Ice Shelf Sastrugi South Pole |
geographic_facet |
Antarctic McMurdo Ice Shelf McMurdo Station Ross Ice Shelf Sastrugi South Pole |
genre |
Antarc* Antarctic Ice Shelf McMurdo Ice Shelf Ross Ice Shelf South pole South pole |
genre_facet |
Antarc* Antarctic Ice Shelf McMurdo Ice Shelf Ross Ice Shelf South pole South pole |
op_source |
http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR04-22.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.205.3175 http://www.crrel.usace.army.mil/techpub/CRREL_Reports/reports/TR04-22.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766268531180044288 |