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  • 1
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    Specification for a Program for an Interative Aeroelastic Solution (PIAS) (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An engineering and software specification which was written for a computer program to calculate aeroelastic structural loads including the effects of nonlinear aerodynamics is presented. The procedure used in the program for an iterative aeroelastic solution (PIAS) is to alternately execute two computer codes: one to calculate aerodynamic loads for a specific wing shape, and another to calculate the deflected shape caused by this loading. A significant advantage to the design of PIAS is that the initial aerodynamic module can be replaced with others. The leading edge vortex (LEV) program is used as the aerodynamic module in PIAS. This provides the capability to calculate aeroelastic loads, including the effects of a separation induced leading edge vortex. The finite element method available in ATLAS Integrated structural analysis and design system is used to determine the deflected wing shape for the applied aerodynamics and inertia loads. The data management capabilities in ATLAS are used by the execution control monitor (ECM) of PIAS to control the solution process.
    Keywords: AERODYNAMICS
    Type: NASA-CR-172200 , NAS 1.26:172200 , D6-52134
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    ATLAS, an integrated structural analysis and design system. Volume 3: User's manual, input and execution data (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The input data and execution control statements for the ATLAS integrated structural analysis and design system are described. It is operational on the Control Data Corporation (CDC) 6600/CYBER computers in a batch mode or in a time-shared mode via interactive graphic or text terminals. ATLAS is a modular system of computer codes with common executive and data base management components. The system provides an extensive set of general-purpose technical programs with analytical capabilities including stiffness, stress, loads, mass, substructuring, strength design, unsteady aerodynamics, vibration, and flutter analyses. The sequence and mode of execution of selected program modules are controlled via a common user-oriented language.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-159043 , D6-25400-0003-VOL-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    ATLAS, an integrated structural analysis and design system. Volume 1: ATLAS user's guide (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Some of the many analytical capabilities provided by the ATLAS Version 4.0 System in the logical sequence are described in which model-definition data are prepared and the subsequent computer job is executed. The example data presented and the fundamental technical considerations that are highlighted can be used as guides during the problem solving process. This guide does not describe the details of the ATLAS capabilities, but provides an introduction to the new user of ATLAS to the level at which the complete array of capabilities described in the ATLAS User's Manual can be exploited fully.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-159041 , D6-25400-0001-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    The ATLAS integrated structural analysis and design software system (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The ATLAS system provides an extensive set of integrated technical computer-program modules for the analysis and design of general structural configurations, as well as capabilities that are particularly suited for the aeroelastic design of flight vehicles. The system is based on the stiffness formulation of the finite element structural analysis method and can be executed in batch and interactive computing environments on CDC 6600/CYBER computers. Problem-definition input data are written in an engineering-oriented language using a free field format. Input-data default values, generation options, and data quality checks provided by the preprocessors minimize the amount of data and flowtime for problem definition/verfication. Postprocessors allow selected input and calculated data to be extracted, manipulated, and displayed via on-line and off-line prints or plots for monitoring and verifying problem solutions. The sequence and mode of execution of selected program modules are controlled by a common user-oriented language.
    Keywords: STRUCTURAL MECHANICS
    Type: Res. in Computerized Structural Analysis and Syn.,; p 1-14
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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