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  • Other Sources  (3)
  • Man/System Technology and Life Support  (2)
  • Spacecraft Design, Testing and Performance
  • 2000-2004  (3)
  • 2003  (3)
  • 1
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    Tool for Bending a Metal Tube Precisely in a Confined Space (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A relatively simple, manually operated tool enables precise bending (typically, within 1/2 of the specified bend angle) of a metal tube located in a confined space, with a minimum of flattening of the tube and without significant gouging of the tube surface. The tool is designed for use in a situation in which the tube cannot be removed from the confined space for placement in a conventional benchmounted tube bender. The tool is also designed for use in a situation in which previously available hand-held tube benders do not afford the required precision, do not support the tube wall sufficiently to prevent flattening or gouging, and/or do not fit within the confined space. The tool is designed and fabricated for the specific outer diameter and bend radius of the tube to be bent. The tool (see figure) includes a clamping/radius block and a top clamping block that contain mating straight channels of semicircular cross section that fit snugly around the tube. The mating portions of the clamping/radius block and the top clamping block are clamped around a length of the tube that is adjacent to the bend and that is intended to remain straight. The clamping/radius block is so named because beyond the straight clamping section, its semicircular channel extends to a non-clamping section that is curved at the specified bend radius. A pivot hole is located in the clamping/radius block at the center of the bend circle. The tool includes a bending block that, like the other blocks, contains a straight semicircular channel that fits around the outside of the tube. The bending block contains a pivot hole to be aligned with the pivot hole in the clamping/radius block. Once the tube has been clamped between the clamping/ radius and top clamping blocks, the bending block is placed around the tube, the pivot holes are aligned, and a pivot pin is inserted through the pivot holes.
    Keywords: Man/System Technology and Life Support
    Type: GSC-14412 , NASA Tech Briefs, April 2003; 5-6
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    NASA's New Orbital Space Plane: A Bridge to the Future (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA is developing a new spacecraft system called the Orbital Space Plane (OSP). The OSP will be launched on an expendable launch vehicle and serve to augment the shuttle in support of the International Space Station by transporting astronauts to and from the International Space Station and by providing a crew rescue system.
    Keywords: Spacecraft Design, Testing and Performance
    Type: AIAA 10th Anniverary of Flight; Jul 14, 2003 - Jul 17, 2003; Dayton, OH; United States
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Modeling of Depth Cue Integration in Manual Control Tasks (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Psychophysical research has demonstrated that human observers utilize a variety of visual cues to form a perception of three-dimensional depth. However, most of these studies have utilized a passive judgement paradigm, and failed to consider depth-cue integration as a dynamic and task-specific process. In the current study, we developed and experimentally validated a model of manual control of depth that examines how two potential cues (stereo disparity and relative size) are utilized in both first- and second-order active depth control tasks. We found that stereo disparity plays the dominate role for determining depth position, while relative size dominates perception of depth velocity. Stereo disparity also plays a reduced role when made less salient (i.e., when viewing distance is increased). Manual control models predict that position information is sufficient for first-order control tasks, while velocity information is required to perform a second-order control task. Thus, the rules for depth-cue integration in active control tasks are dependent on both task demands and cue quality.
    Keywords: Man/System Technology and Life Support
    Type: NASA/TM-2003-211407 , IH-026 , NAS 1.15:211407
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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