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  • 1
    Electronic Resource
    Electronic Resource
    A numerical study of augmented penalty function algorithms for terminally constrained optimal control problems (1974)
    Springer
    Journal of optimization theory and applications 14 (1974), S. 393-403 
    Details
    ISSN: 1573-2878
    Keywords: Augmented penalty function ; penalty function methods ; method of multipliers ; numerical methods ; state variable constraints
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Three augmented penalty function algorithms are tested and compared with an ordinary penalty function algorithm for two demonstration optimal control problems. Although the augmented penalty function is quite helpful in solving control problems with terminal state constraints, the convergence can be improved significantly by providing systematic increases in the penalty constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00933305
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Panel flutter optimization by gradient projection (1975)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 9 (1975), S. 271-296 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A gradient projection optimal control algorithm incorporating conjugate gradient directions of search is described and applied to several minimum weight panel design problems subject to a flutter speed constraint. New numerical solutions are obtained for both simply-supported and clamped homogeneous panels of infinite span for various levels of inplane loading and minimum thickness. The minimum thickness inequality constraint is enforced by a simple transformation of variables.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620090203
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Further discrete variable results for a panel flutter optimization problem (1973)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 7 (1973), S. 537-543 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Numerical solutions are presented for the problem of minimum weight design of a thin one-dimensiona simply-supported, solid panel in compression with one side exposed to a parallel high supersonic air flow. The flutter speed is held fixed, and a minimum thickness constraint is imposed. In addition, a multiplier technique is incorporated into the discrete variable minimization process to improve the convergence speed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620070411
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    Paper (German National Licenses)
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  • 4
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    A numerical study of augmented penalty function algorithms for terminally constrained optimal control problems (1974)
    Springer
    Details
    Publication Date: 1974-10-01
    Print ISSN: 0022-3239
    Electronic ISSN: 1573-2878
    Topics: Mathematics
    Published by Springer
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    PAPER CURRENT
  • 5
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    Further discrete variable results for a panel flutter optimization problem (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Numerical solutions are presented for the problem of minimum weight design of a thin one-dimensional, simply supported, solid panel in compression, with one side exposed to a parallel high supersonic air flow. The flutter speed is held fixed and a minimum thickness constraint is imposed.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering; 7; 4, 19; 1973
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Panel flutter optimization by gradient projection (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A gradient projection optimal control algorithm incorporating conjugate gradient directions of search is described and applied to several minimum weight panel design problems subject to a flutter speed constraint. New numerical solutions are obtained for both simply-supported and clamped homogeneous panels of infinite span for various levels of inplane loading and minimum thickness. The minimum thickness inequality constraint is enforced by a simple transformation of variables.
    Keywords: STRUCTURAL MECHANICS
    Type: International Journal for Numerical Methods in Engineering; 9; 2, 19; 1975
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Manufacturing implementation of off-line programming for the Space Shuttle Main Engines (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An account is given of the efforts made to implement an off-line programming (OLP) system for a gas tungsten arc welding robot in actual manufacturing operations, namely those involved in the manufacture of the SSMEs. In conjunction with a real-time sensor control system, the OLP constitutes the Advanced Robotic Welding System, or 'AROWS'. OLP's task is to develop a robot-motion path without the initial use of the robot to 'teach' the characteristics of such motion; actual process parameters are recorded by OLP and correlated with the position along the weld.
    Keywords: ENGINEERING (GENERAL)
    Type: SME PAPER MR89-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Minimum Altitude-Loss Soaring in a Specified Vertical Wind Distribution (1979)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Minimum altitude-loss flight of a sailplane through a given vertical wind distribution is discussed. The problem is posed as an optimal control problem, and several numerical solutions are obtained for a sinusoidal wind distribution.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA. Langley Res. Center Sci. and Technol. of Low Speed and Motorless Flight; p 305-318
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Off-line programming motion and process commands for robotic welding of Space Shuttle main engines (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The off-line-programming software and hardware being developed for robotic welding of the Space Shuttle main engine are described and illustrated with diagrams, drawings, graphs, and photographs. The menu-driven workstation-based interactive programming system is designed to permit generation of both motion and process commands for the robotic workcell by weld engineers (with only limited knowledge of programming or CAD systems) on the production floor. Consideration is given to the user interface, geometric-sources interfaces, overall menu structure, weld-parameter data base, and displays of run time and archived data. Ongoing efforts to address limitations related to automatic-downhand-configuration coordinated motion, a lack of source codes for the motion-control software, CAD data incompatibility, interfacing with the robotic workcell, and definition of the welding data base are discussed.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Journal of Robotic Systems (ISSN 0471-2223); 4; 355-375
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Minimum-fuel aerodynamic orbital plane change maneuvers (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Several minimum-fuel, aerodynamically controlled, orbital plane change problems are formulated and solved as optimal control problems. A gradient projection algorithm is used to iteratively modify both the control functions, angle of attack and bank angle, and two control parameters to obtain the optimal trajectory. The atmospheric flight profile is combined with two Keplerian (two-body vacuum flight) arcs so that a complete orbit-to-orbit analysis results. The vehicle used in this investigation is the Space Transportation System Shuttle Orbiter. The effects of heat load constraint level and plane change angle are analysed.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 81-0167 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; St. Louis, MO
    Format: text
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    NASA TECHNICAL REPORTS
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