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  • Variable Geometry Truss
    Manipulator Arm System

    Link to NASA Link to Langley Research Center


    The Langley Research Center is involved in a cooperative agreement, funded by the Department of Energy, with Battelle, Pacific Northwest Laboratory, and Oak Ridge National Laboratory, to develop a Variable Geometry Truss (VGT) manipulator arm system to remove low level radioactive hardware from nuclear facilities. The VGT is a manipulator arm that weighs approximately 2300 pounds, measures 13 feet in length, and tapers from a diameter of 46 inches at the base to a diameter of 32 inches at the tip. The three main components of the manipulator are the root VGT, a tapered static truss, and a tip VGT. The system will ultimately be mounted to RedZone Robotics's remotely operated vehicle to enable greater dexterity in the disassembly and removal of contaminated nuclear facilities.

    The VGT is designed to support 2150 pounds of load and 51,000 inch-pounds of torque applied at the tip VGT with a safety factor of 2.5. The root and tip VGT can each rotate ± 30 degrees in either of two orthogonal planes and can each extend or contract in length. A wide range of motion, controllable through a single joystick, is made possible by this unique three degree-of-freedom design. Tight integration of design and analysis enabled the successful production of the VGT system. Detailed three-dimensional computer-aided-drafting (CAD) models were directly imported into sophisticated analysis codes to assess and reduce critical stress concentrations. Integration at the computer model level facilitated a rapid design/analysis cycle. The same CAD models were also electronically transferred to the fabrication facility for part production. The root VGT and static truss have been designed, built, tested, and shipped. The tip VGT is scheduled to be shipped in mid-1996.


    VGT Images, showing solid model from Pro/Engineer, fabricated article, analysis model, and test article

    Contacts:
    Design: Elvin Ahl, (804)864-7176
    Analysis: Mike Lindell, (804)864-7038

    Site last reviewed: January 5, 2004
    Responsible NASA Official & Site Curator: Drew Hope, Head, Mechanical Design Branch, Systems Engineering Competency, d.j.hope@larc.nasa.gov, (757) 864-7278
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