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  • Other Sources  (8)
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  • 1
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    Optimizing simulated trajectories (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: General-purpose rigid-body six-degrees-of-freedom program is used to solve wide variety of atmospheric flight mechanics and orbital transfer problems. Written for analysis of powered or unpowered vehicles operation near rotating oblate planet, typical applications include: guidance and flight-control system simulation and analysis, loads and dispersion-type analysis.
    Keywords: MECHANICS
    Type: LAR-12089 , NASA Tech Briefs (ISSN 0145-319X); 2; 4; P. 3
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Six-degree-of-freedom program to optimize simulated trajectories (6D POST). Volume 1: Formulation manual (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The basic equations and models used in a computer program (6D POST) to optimize simulated trajectories with six degrees of freedom were documented. The 6D POST program was conceived as a direct extension of the program POST, which dealt with point masses, and considers the general motion of a rigid body with six degrees of freedom. It may be used to solve a wide variety of atmospheric flight mechanics and orbital transfer problems for powered or unpowered vehicles operating near a rotating oblate planet. Its principal features are: an easy to use NAMELIST type input procedure, an integrated set of Flight Control System (FCS) modules, and a general-purpose discrete parameter targeting and optimization capability. It was written in FORTRAN 4 for the CDC 6000 series computers.
    Keywords: ASTRODYNAMICS
    Type: NASA-CR-132741 , MCR-74-423-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Program to Optimize Simulated Trajectories (POST). Volume 3: Programmer's manual (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Information pertinent to the programmer and relating to the program to optimize simulated trajectories (POST) is presented. Topics discussed include: program structure and logic, subroutine listings and flow charts, and internal FORTRAN symbols. The POST core requirements are summarized along with program macrologic.
    Keywords: ASTRODYNAMICS
    Type: NASA-CR-132691 , MCR-75-143-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Program to Optimize Simulated Trajectories (POST). Volume 1: Formulation manual (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A general purpose FORTRAN program for simulating and optimizing point mass trajectories (POST) of aerospace vehicles is described. The equations and the numerical techniques used in the program are documented. Topics discussed include: coordinate systems, planet model, trajectory simulation, auxiliary calculations, and targeting and optimization.
    Keywords: ASTRODYNAMICS
    Type: NASA-CR-132689 , MCR-75-143-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A two-level trajectory decomposition algorithm featuring optimal intermediate target selection (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A decomposition algorithm is presented which optimizes complex missions by partitioning the trajectory into natural segments such as ascent or entry. Each segment defines a full-rank targeting subproblem. These are solved sequentially using the Newton-Raphson algorithm. The master problem, representing the complete mission, is to determine subproblem targets and master-problem controls that optimize the mission objective subject to intersegment constraints. The gradient projection algorithm solves this problem using derivatives obtained analytically from finite-difference subproblem sensitivities. Thus, the mission is optimized by coordinating the solution of tractible subproblems. Computational results for a synchronous equatorial mission are included.
    Keywords: ASTRODYNAMICS
    Type: Journal of Spacecraft and Rockets; 14; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Capabilities and applications of the Program to Optimize Simulated Trajectories (POST). Program summary document (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The capabilities and applications of the three-degree-of-freedom (3DOF) version and the six-degree-of-freedom (6DOF) version of the Program to Optimize Simulated Trajectories (POST) are summarized. The document supplements the detailed program manuals by providing additional information that motivates and clarifies basic capabilities, input procedures, applications and computer requirements of these programs. The information will enable prospective users to evaluate the programs, and to determine if they are applicable to their problems. Enough information is given to enable managerial personnel to evaluate the capabilities of the programs and describes the POST structure, formulation, input and output procedures, sample cases, and computer requirements. The report also provides answers to basic questions concerning planet and vehicle modeling, simulation accuracy, optimization capabilities, and general input rules. Several sample cases are presented.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-2770
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Programs To Optimize Spacecraft And Aircraft Trajectories (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: POST/6D POST is set of two computer programs providing ability to target and optimize trajectories of powered or unpowered spacecraft or aircraft operating at or near rotating planet. POST treats point-mass, three-degree-of-freedom case. 6D POST treats more-general rigid-body, six-degree-of-freedom (with point masses) case. Used to solve variety of performance, guidance, and flight-control problems for atmospheric and orbital vehicles. Applications include computation of performance or capability of vehicle in ascent, or orbit, and during entry into atmosphere, simulation and analysis of guidance and flight-control systems, dispersion-type analyses and analyses of loads, general-purpose six-degree-of-freedom simulation of controlled and uncontrolled vehicles, and validation of performance in six degrees of freedom. Written in FORTRAN 77 and C language. Two machine versions available: one for SUN-series computers running SunOS(TM) (LAR-14871) and one for Silicon Graphics IRIS computers running IRIX(TM) operating system (LAR-14869).
    Keywords: MECHANICS
    Type: LAR-14869 , LAR-14871 , NASA Tech Briefs (ISSN 0145-319X); 18; 2; P. 60
    Format: text
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  • 8
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    A two-level trajectory decomposition algorithm featuring optimal intermediate target selection (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A decomposition algorithm is presented that optimizes complex missions by partitioning the trajectory into natural segments such as ascent or entry. Each segment defines a full-rank targeting subproblem. These are solved sequentially using the Newton-Raphson algorithm. The master problem, representing the complete mission, is to determine subproblem targets and master-problem controls that optimize the mission objective subject to intersegment constraints. The gradient projection algorithm solves this problem using derivatives obtained analytically from finite-difference subproblem sensitivities. Thus, the mission is optimized by coordinating the solution of tractible subproblems. Computational results for a synchronous equatorial mission are included.
    Keywords: ASTRODYNAMICS
    Type: AAS PAPER 75-054 , Astrodynamics Specialist Conference; Jul 28, 1975 - Jul 30, 1975; Nassau; Bahamas
    Format: text
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    NASA TECHNICAL REPORTS
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