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Omaha, NE, United States

Burnett J.,University of Nebraska - Lincoln | Rack F.R.,University of Nebraska - Lincoln | Blythe D.,University of Nebraska - Lincoln | Swanson P.,EAD Control Systems LLC | And 7 more authors.
Annals of Glaciology | Year: 2014

The WISSARD (Whillans Ice Stream Subglacial Access Research Drilling) traversable hotwater drill system was designed to create various-diameter ice boreholes to a depth of >800 m, with most major components being controllable from a single user interface. The drill control system operates four low-pressure pumps for water generation and circulation, two hot-water generation units containing a total of six diesel burner modules with integrated high-pressure pumps, three winches (one with independent level-wind motor), a four-motor linear traction drive, and a large number of analog and digital sensors to monitor system performance and cleanliness. Due to development time constraints the control system design focused on utilizing commercial off-the-shelf components, while being highly modular, easily expandable and rapidly deployable. Additional emphasis was placed on providing redundant manual operator controls and maintaining a low degree of system automation to avoid dependence on software control loops for first-season deployment. The result of this design paradigm was a control system that was taken from concept to full operation in <6 months, successfully performing in the field without insurmountable problems. © 2014, International Glaciology Society. All rights reserved. Source

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