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  • Other Sources  (51)
  • SPACE TRANSPORTATION  (31)
  • CYBERNETICS  (10)
  • METEOROLOGY AND CLIMATOLOGY  (10)
  • 1990-1994  (51)
  • 1
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    Learning to train neural networks for real-world control problems (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Over the past three years, our group has concentrated on the application of neural network methods to the training of controllers for real-world systems. This presentation describes our approach, surveys what we have found to be important, mentions some contributions to the field, and shows some representative results. Topics discussed include: (1) executing model studies as rehearsal for experimental studies; (2) the importance of correct derivatives; (3) effective training with second-order (DEKF) methods; (4) the efficacy of time-lagged recurrent networks; (5) liberation from the tyranny of the control cycle using asynchronous truncated backpropagation through time; and (6) multistream training for robustness. Results from model studies of automotive idle speed control serve as examples for several of these topics.
    Keywords: CYBERNETICS
    Type: JPL, A Decade of Neural Networks: Practical Applications and Prospects; p 191
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  • 2
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    Rescheduling with iterative repair (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This paper presents a new approach to rescheduling called constraint-based iterative repair. This approach gives our system the ability to satisfy domain constraints, address optimization concerns, minimize perturbation to the original schedule, and produce modified schedules quickly. The system begins with an initial, flawed schedule and then iteratively repairs constraint violations until a conflict-free schedule is produced. In an empirical demonstration, we vary the importance of minimizing perturbation and report how fast the system is able to resolve conflicts in a given time bound. These experiments were performed within the domain of Space Shuttle ground processing.
    Keywords: CYBERNETICS
    Type: NASA. Ames Research Center, Working Notes from the 1992 AAAI Spring Symposium on Practical Approaches to Scheduling and Planning; p 92-96
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  • 3
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-38 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A debris/ice/TPS assessment and photographic analysis was conducted for the Space Shuttle Mission STS-38. Debris inspection of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the external tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-38, and their overall effect on the Space Shuttle Program are documented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103815 , NAS 1.15:103815
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  • 4
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-41 (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/Thermal Protection System (TPS) assessment and photographic analysis was conducted for Space Shuttle Mission STS-41. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. Documented here are the debris/ice/TPS conditions and photographic analysis of Mission STS-41, and their overall effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103814 , NAS 1.15:103814
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  • 5
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    Reliable design of H-2 optimal reduced-order controllers via a homotopy algorithm (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Due to control processor limitations, the design of reduced-order controllers is an active area of research. Suboptimal methods based on truncating the order of the corresponding linear-quadratic-Gaussian (LQG) compensator tend to fail if the requested controller dimension is sufficiently small and/or the requested controller authority is sufficiently high. Also, traditional parameter optimization approaches have only local convergence properties. This paper discusses a homotopy algorithm for optimal reduced-order control that has global convergence properties. The exposition is for discrete-time systems. The algorithm has been implemented in MATLAB and is applied to a benchmark problem.
    Keywords: CYBERNETICS
    Type: In: Controls for optical systems; Proceedings of the Meeting, Orlando, FL, Apr. 21, 22, 1992 (A93-34276 13-74); p. 116-127.
    Format: text
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  • 6
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    Debris/ice/TPS assessment and integrated photographic analysis for Shuttle Mission STS-46 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/TPS assessment and integrated photographic analysis was conducted for Shuttle Mission STS-46. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. This report documents the debris/ice/TPS conditions and integrated photographic analysis of Shuttle Mission STS-46, and the resulting effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-107552 , NAS 1.15:107552
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  • 7
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    Debris/ice/TPS assessment and integrated photographic analysis for Shuttle Mission STS-50 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Thermal Protection System (TPS) assessment and integrated photographic analysis was conducted for Shuttle Mission STS-50. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the external tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and integrated photographic analysis of Shuttle Mission STS-50, and the resulting effect on the Space Shuttle Program are documented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-107550 , NAS 1.15:107550
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  • 8
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    Debris/ice/TPS assessment and integrated photographic analysis for Shuttle Mission STS-45 (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Debris Team has developed and implemented measures to control damage from debris in the Shuttle operational environment and to make the control measures a part of routine launch flows. These measures include engineering surveillance during vehicle processing and closeout operations, facility and flight hardware inspections before and after launch, and photographic analysis of mission events. Photographic analyses of mission imagery from launch, on-orbit, and landing provide significant data in verifying proper operation of systems and evaluating anomalies. In addition to the Kennedy Space Center (KSC) Photo/Video Analysis, reports from Johnson Space Center, Marshall Space Flight Center, and Rockwell International-Downey are also included to provide an integrated assessment of each Shuttle mission.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-107545 , NAS 1.15:107545
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  • 9
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    Debris/ice/TPS assessment and photographic analysis for shuttle mission STS-31R (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/Thermal Protection System (TPS) assessment and photographic analysis was conducted for Space Shuttle Mission STS-31R. Debris inspections of the flight elements and launch pad are performed before and after launch. Ice/frost conditions on the External Tank are assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography is analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-31R, is presented along with their overall effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-102790 , NAS 1.15:102790
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  • 10
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    CSU FIRE 2 cirrus field experiment: Description of field deployment phase (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Colorado State University (CSU) surface observing systems are described. These systems were deployed at the Parsons, Kansas site during the FIRE 2 Cirrus Special Observing Period (SOP) from 13 Nov. - 7 Dec. 1991. The geographical coordinates of the site containing most of the CSU instrumentation are 37 deg. 18 min N. latitude and 96 deg. 30 min. W. longitude; site elevation was 269 meters. In addition, one surface meteorological and broadband flux observing site was maintained at the Tri City Airport which is approximately 18 miles due west of Parsons (37 deg. 20 min. N. latitude, 95 deg. 30 min. 30 sec. W. longitude). A map of the locations of the CSU deployment sites is presented. At the main Parsons site, the instrumentation was located directly adjacent to and north of a lake. Under most cirrus observing conditions, when the wing had a significant southernly component, the lake was upwind of the observing site. The measurements and observations collected during the experiment are listed. These measurements may be grouped into five categories: surface meteorology; infrared spectral and broadband measurements; solar spectral and broadband measurements; upper air measurements; and cloud measurements. A summary of observations collected at the Parsons site during the SOP are presented. The wind profiler, laser ceilometer, surface meteorology and surface broadband radiation instrumentation were operated on a continuous basis. All other systems were operated on an 'on demand' basis when cloud conditions merited the collection of data.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-CR-193162 , NAS 1.26:193162 , FIRE-SER-8 , ATMOSPHERIC-SCI-PAPER-506
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