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  • 1
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    Self-tuning multivariable pole placement control of a multizone crystal growth furnace (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper presents the design and implementation of a multivariable self-tuning temperature controller for the control of lead bromide crystal growth. The crystal grows inside a multizone transparent furnace. There are eight interacting heating zones shaping the axial temperature distribution inside the furnace. A multi-input, multi-output furnace model is identified on-line by a recursive least squares estimation algorithm. A multivariable pole placement controller based on this model is derived and implemented. Comparison between single-input, single-output and multi-input, multi-output self-tuning controllers demonstrates that the zone-to-zone interactions can be minimized better by a multi-input, multi-output controller design. This directly affects the quality of crystal grown.
    Keywords: CYBERNETICS
    Type: International Journal of Adaptive Control and Signal Processing (ISSN 0890-6327); 6; 2; p. 127-138.
    Format: text
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  • 2
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    An expert system for ground support of the Hubble space telescope (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Hubble Space Telescope is an orbiting optical observatory due to be launched by the Space Shuttle in late 1987. It is a complex, multi-instrument observatory whose resources will be available to the world-wide astronomical community. The 'Transformation' system is a hybrid system which utilizes a rule-based expert system to convert scientific proposals into pre-optimized linked hierarchies of spacecraft activities. These activities are generated in a format that can be directly scheduled by the planning and scheduling component of the Space Telescope ground support system. The Transformation system will be described in detail in this paper, with particular attention given to the rule base.
    Keywords: CYBERNETICS
    Type: NASA, Goddard Space Flight Center, Proceedings of 1986 Conference on Artificial Intelligence Applications; p 43-54
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  • 3
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    Automated generation of spacecraft activity plans (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: An expert system is described which is currently in place in the ground support system of the Hubble Space Telescope (HST). Known as the Transformation system, it is used to process proposals submitted by the HST's world wide user community, converting the scientific descriptions of the astronomical observations into detailed spacecraft activities which are linked in time. These detailed activities are formatted to be both readable by the telescope operations staff and directly schedulable by the planning and scheduling portion of the ground system. The implementation of the Transformation system is particularly interesting as the system was developed at the same time that its target system (the planning and scheduling system) was being built.
    Keywords: CYBERNETICS
    Type: NASA, Marshall Space Flight Center, Second Conference on Artificial Intelligence for Space Applications; p 413-417
    Format: text
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  • 4
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    Knowledge based and interactive control for the Superfluid Helium On-orbit Transfer Project (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: NASA's Superfluid Helium On-Orbit Transfer (SHOOT) project is a Shuttle-based experiment designed to acquire data on the properties of superfluid helium in micro-gravity. Aft Flight Deck Computer Software for the SHOOT experiment is comprised of several monitoring programs which give the astronaut crew visibility into SHOOT systems and a rule based system which will provide process control, diagnosis and error recovery for a helium transfer without ground intervention. Given present Shuttle manifests, this software will become the first expert system to be used in space. The SHOOT Command and Monitoring System (CMS) software will provide a near real time highly interactive interface for the SHOOT principal investigator to control the experiment and to analyze and display its telemetry. The CMS software is targeted for all phases of the SHOOT project: hardware development, pre-flight pad servicing, in-flight operations, and post-flight data analysis.
    Keywords: CYBERNETICS
    Type: NASA. Goddard Space Flight Center, The 1989 Goddard Conference on Space Applications of Artificial Intelligence; p 3-11
    Format: application/pdf
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  • 5
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    An expert system to advise astronauts during experiments (1989)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Work being done on an expert system designed to improve the quality of space experimentation in vestibular physiology is described. Emphasis is given to two of the several modules of which the system architecture is composed: the Protocol Manager and the Interesting Data Filter. Some engineering issues related to human factors and to data acquisition and monitoring are also addressed.
    Keywords: CYBERNETICS
    Type: IAF PAPER 89-033
    Format: text
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  • 6
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    Applying artificial intelligence to astronomical databases - A survey of applicable technology (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: AI technologies which are relevant to astronomical data bases are reviewed, including intelligent interfaces, internal representations, and data analysis. The natural language query system developed for the Hubble Space Telescope and the technique of goal directed queries are considered. Two technologies which might lead to the development of pictorial interfaces are presented: one based on Bayesian probabilities, the other on associative memories. The development of a data analysis system which can discover classes of data within a data base without any information other than the data itself is examined. A prototype data analysis assistant to automatically develop and implement plans for data reduction is described.
    Keywords: CYBERNETICS
    Type: Astronomy from Large Databases: Scientific Objectives and Methodological Approaches; Oct 12, 1987 - Oct 14, 1987; Garching; Germany
    Format: text
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