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  • Other Sources  (8)
  • 1980-1984  (8)
  • 1
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    Structural response analysis of unlatched shuttle payloads during reentry and landing (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: SPACE TRANSPORTATION
    Type: JPL, Proceedings of the Shuttle Payload Dynamic Environments and Loads Prediction Workshop, Volume 2; p 463-483
    Format: text
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  • 2
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    An experimental investigation of the aerodynamics and cooling of a horizontally-opposed air-cooled aircraft engine installation (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A flight-test based research program was performed to investigate the aerodynamics and cooling of a horizontally-opposed engine installation. Specific areas investigated were the internal aerodynamics and cooling mechanics of the installation, inlet aerodynamics, and exit aerodynamics. The applicable theory and current state of the art are discussed for each area. Flight-test and ground-test techniques for the development of the cooling installation and the solution of cooling problems are presented. The results show that much of the internal aerodynamics and cooling technology developed for radial engines are applicable to horizontally opposed engines. Correlation is established between engine manufacturer's cooling design data and flight measurements of the particular installation. Also, a flight-test method for the development of cooling requirements in terms of easily measurable parameters is presented. The impact of inlet and exit design on cooling and cooling drag is shown to be of major significance.
    Keywords: AERODYNAMICS
    Type: NASA-CR-3405
    Format: application/pdf
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  • 3
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    The reduced order model problem in distributed parameter systems adaptive identification and control (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The basic assumption that a large space structure can be decoupled preceding the application of reduced order active control was considered and alternative solutions to the control of such structures (in contrast to the strict modal control) were investigated. The transfer function matrix from the actuators to the sensors was deemed to be a reasonable candidate. More refined models from multivariable systems theory were studied and recent results in the multivariable control field were compared with respect to theoretical deficiencies and likely problems in application to large space structures.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-164670
    Format: application/pdf
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  • 4
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    The reduced order model problem in distributed parameter systems adaptive identification and control (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The reduced order model problem in distributed parameter systems adaptive identification and control is investigated. A comprehensive examination of real-time centralized adaptive control options for flexible spacecraft is provided.
    Keywords: CYBERNETICS
    Type: NASA-CR-164059 , VPI-TR-EE-812 , PR-2
    Format: application/pdf
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  • 5
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    Simulated lumped-parameter system reduced-order adaptive control studies (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two methods of interpreting the misbehavior of reduced order adaptive controllers are discussed. The first method is based on system input-output description and the second is based on state variable description. The implementation of the single input, single output, autoregressive, moving average system is considered.
    Keywords: CYBERNETICS
    Type: NASA-CR-163992 , EE-8119
    Format: application/pdf
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  • 6
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    Flight test method for the determination of reciprocating engine cooling requirements (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that the effective cooling of aircraft reciprocating engines is still a problem area for the general aviation industry. Miley et al. (1981) have reported the results of an investigation of problems associated with cooling and installation aerodynamics. A description is given of a flight test procedure which was developed in connection with the considered investigation. It is shown that the test procedure provides valid cooling requirements data for a particular installation. The data are in terms of easily measurable parameters. The employment of the test procedure, which is based on the NACA cooling correlation method, can lead to more effective cooling installations and the solution of existing cooling problems.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 81-2446 , Flight Testing Conference; Nov 11, 1981 - Nov 13, 1981; Las Vegas, NV
    Format: text
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  • 7
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    Problems in the application of multivariable adaptive control to flexible spacecraft (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present investigation is concerned with the application of adaptive control to distributed parameter systems (DPS) which arise in the modeling of large space structures (LSS). Distributed parameter and multivariable models for LSS are introduced and the decoupled adaptive control of such models is considered. Possibilities to achieve adaptive control in connection with a more general model are also examined. It is found that, in concept, adaptive control appears to be a natural choice for solving attitude and shape perturbation problems in LSS. However, due to the distributed parameter nature of such structures and the current lack of experience in their control, the problem must be phrased in general terms which are very difficult to deal with. In particular, detailed a priori plant knowledge is currently required so that decoupling and/or reduced order models of sufficient accuracy can be provided.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: In: Conference on Decision and Control, 20th, and Symposium on Adaptive Processes; Dec 16, 1981 - Dec 18, 1981; San Diego, CA
    Format: text
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  • 8
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    On adaptive regulation of flexible spacecraft (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that the regulation of shape and attitude disturbances in large space structures (LSS) using adaptive control remains an actively studied, yet controversial approach, just as adapative control itself. The controversy arises because the utility of many methods of adapatively controlling distributed parameter systems (DPS) is unsubstantiated. However, it appears that adaptive control can be applied to solve problems in LSS control which are not amenable to more common control methods. The present investigation has the objective to clarify the application of adaptive control to LSS. Attention is given to the characteristics of adaptive model control, aspects of simultaneous mode shape adaption, questions of multivariable simultaneous identification and control, and direct adaptive multivariable control.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: Dynamics and control of large flexible spacecraft; Third Symposium; Jun 15, 1981 - Jun 17, 1981; Blacksburg, VA
    Format: text
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