PENDULUM STEERING FOR THERMAL PROBES IN GLACIERS.

Pendulum steering, a new concept of attitude stabilization for thermal probes or coring drills in ice, eliminates instability. The center of support is placed above the center of gravity. A lower and upper hot point produce melt penetration. The ratio of their power levels is the basis for stabiliza...

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Bibliographic Details
Main Author: Aamot,Haldor W. C.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER N H
Format: Text
Language:English
Published: 1967
Subjects:
Snow
Ice and Permafrost
Mfg & Industrial Eng & Control of Product Sys
*THERMAL PROPERTIES
*DRILLING
GLACIERS
CONDUCTIVITY
STABILITY
PENETRATION
MACHINE TOOLS
DRILLS
ICE
DRILLING MACHINES
TEMPERATURE
GRAVITY
COLD WEATHER TESTS
Ice
Ice cap
permafrost
Online Access:http://www.dtic.mil/docs/citations/AD0657581
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0657581
Description
Summary:Pendulum steering, a new concept of attitude stabilization for thermal probes or coring drills in ice, eliminates instability. The center of support is placed above the center of gravity. A lower and upper hot point produce melt penetration. The ratio of their power levels is the basis for stabilization, which is provided by the automatic control of the heater in the upper hot point. This feature makes possible a single thermal probe design that is suitable for all ice cap temperatures and a wide range of penetration rates (i.e., applied power levels). The simplicity of a thermal probe with pendulum steering suggests availability at modest cost and versatility as a widely applicable tool. (Author)

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