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  • Other Sources  (6)
  • Instrumentation and Photography  (3)
  • Man/System Technology and Life Support  (3)
  • 1995-1999  (6)
  • 1
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    Thickness Measurement Device for Ice/Water Mixture (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A device and method are provided for determining the thickness of an ice and water mixture accumulated on the outer surface of an object. First and second total impedance sensors are operated at first and second frequencies over which the dielectric constants for water and ice are substantially the same. Corresponding first and second AC total impedance measuring circuits are coupled to the first and second sensors to produce output voltages based on the total impedance changes sensed by the sensors. A processor is coupled to the first and second measuring circuits to generate a voltage ratio using the measured output voltages. The voltage ratio is indicative of the thickness of the ice and water mixture. The novelty of the present invention is the use of two frequencies and dual geometry impedance sensors in order to be sensitive to the formation of ice. Thus, critical situations created by the presence of solid ice can be averted. The device is simple and is easily incorporated into current technology thereby making its realization cost- effective.
    Keywords: Instrumentation and Photography
    Type: NAS 1.71:LAR-15061-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Hybrid Modeling for Testing Intelligent Software for Lunar-Mars Closed Life Support (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Intelligent software is being developed for closed life support systems with biological components, for human exploration of the Moon and Mars. The intelligent software functions include planning/scheduling, reactive discrete control and sequencing, management of continuous control, and fault detection, diagnosis, and management of failures and errors. Four types of modeling information have been essential to system modeling and simulation to develop and test the software and to provide operational model-based what-if analyses: discrete component operational and failure modes; continuous dynamic performance within component modes, modeled qualitatively or quantitatively; configuration of flows and power among components in the system; and operations activities and scenarios. CONFIG, a multi-purpose discrete event simulation tool that integrates all four types of models for use throughout the engineering and operations life cycle, has been used to model components and systems involved in the production and transfer of oxygen and carbon dioxide in a plant-growth chamber and between that chamber and a habitation chamber with physicochemical systems for gas processing.
    Keywords: Man/System Technology and Life Support
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Two-Phase Technology at NASA/Johnson Space Center (1999)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Since the baseline International Space Station (ISS) External Active Thermal Control System (EATCS) was changed from a two-phase mechanically pumped system to a single phase cascade system in the fall of 1993, two-phase EATCS research has continued at a low level at JSC. One of-the lessons of the ISS EATCS selection was that two-phase thermal control systems must have significantly lower power than comparable single phase systems to overcome their larger radiator area, larger line and fluid mass, and perceived higher technical risk. Therefore, research at JSC has concentrated on low power mechanically pumped two-phase EATCSs. In the presentation, the results of a study investigating the trade of single and two-phase mechanically pumped EATCSs for space vehicles will be summarized. The low power two-phase mechanically pumped EATCS system under development at JSC will be described in detail and the current design status of the subscale test unit will be reviewed. Also, performance predictions for a full size EATCS will be presented. In addition to the discussion of two-phase mechanically pumped EATCS development at JSC, two-phase technologies under development for biological water processing will be discussed. These biological water processor technologies are being prepared for a 2001 flight experiment and subsequent usage on the TransHab module on the International Space Station.
    Keywords: Man/System Technology and Life Support
    Type: Two-Phase Technology 1999; May 17, 1999 - May 19, 1999; College Park, MD; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    High Speed Rotor Head Mounted Instrumentation System (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: NASA Ames Research Center has been investigating the air flow of a rotor blade on a UH-60 Blackhawk helicopter in-flight. This paper will address the hardware problems and solutions used to design and fabricate an instrumentation system on top of a UH-60 main rotor head. The instrumentation system consisted of 10 data systems operating in parallel and collected data from 370 sensors that are mounted in four rotor blades and on the rotating rotor head. The data was recorded on board the aircraft and simultaneously down linked to the ground station at 7.5 MHz.
    Keywords: Instrumentation and Photography
    Type: Instrument Society of America 43rd International Instrumentation Symposium; May 04, 1997 - May 08, 1997; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Headphone and Head-Mounted Visual Displays for Virtual Environments (1998)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A realistic auditory environment can contribute to both the overall subjective sense of presence in a virtual display, and to a quantitative metric predicting human performance. Here, the role of audio in a virtual display and the importance of auditory-visual interaction are examined. Conjectures are proposed regarding the effectiveness of audio compared to visual information for creating a sensation of immersion, the frame of reference within a virtual display, and the compensation of visual fidelity by supplying auditory information. Future areas of research are outlined for improving simulations of virtual visual and acoustic spaces. This paper will describe some of the intersensory phenomena that arise during operator interaction within combined visual and auditory virtual environments. Conjectures regarding audio-visual interaction will be proposed.
    Keywords: Instrumentation and Photography
    Type: 15th International Conference of the Audio Engineering Society; Oct 31, 1998 - Nov 02, 1998; Snekkersten; Denmark
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The Identification and Modeling of Visual Cue Usage in Manual Control Task Experiments (1999)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Many fields of endeavor require humans to conduct manual control tasks while viewing a perspective scene. Manual control refers to tasks in which continuous, or nearly continuous, control adjustments are required. Examples include flying an aircraft, driving a car, and riding a bicycle. Perspective scenes can arise through natural viewing of the world, simulation of a scene (as in flight simulators), or through imaging devices (such as the cameras on an unmanned aerospace vehicle). Designers frequently have some degree of control over the content and characteristics of a perspective scene; airport designers can choose runway markings, vehicle designers can influence the size and shape of windows, as well as the location of the pilot, and simulator database designers can choose scene complexity and content. Little theoretical framework exists to help designers determine the answers to questions related to perspective scene content. An empirical approach is most commonly used to determine optimum perspective scene configurations. The goal of the research effort described in this dissertation has been to provide a tool for modeling the characteristics of human operators conducting manual control tasks with perspective-scene viewing. This is done for the purpose of providing an algorithmic, as opposed to empirical, method for analyzing the effects of changing perspective scene content for closed-loop manual control tasks.
    Keywords: Man/System Technology and Life Support
    Type: NASA/TM-1999-208798 , NAS 1.15:208798 , IH-004
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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