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  • 1975-1979  (5)
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  • 1
    facet.materialart.
    Unknown
    Stability characteristics of elastic airplane (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: System of computer programs uses linear theories to evaluate static and dynamic stability, trim state, inertial, and aerodynamic loading, and elastic deformations of aircraft configurations at subsonic and supersonic speeds. Primary emphasis is on analysis of stability and control characteristics of flexible aircraft. System also solves simple rigid aerodynamic problems.
    Keywords: MECHANICS
    Type: ARC-11144 , NASA Tech Briefs (ISSN 0145-319X); 3; 1; P. 99
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Static and dynamic stability analysis of the space shuttle vehicle-orbiter (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The longitudinal static and dynamic stability of a Space Shuttle Vehicle-Orbiter (SSV Orbiter) model is analyzed using the FLEXSTAB computer program. Nonlinear effects are accounted for by application of a correction technique in the FLEXSTAB system; the technique incorporates experimental force and pressure data into the linear aerodynamic theory. A flexible Orbiter model is treated in the static stability analysis for the flight conditions of Mach number 0.9 for rectilinear flight (1 g) and for a pull-up maneuver (2.5 g) at an altitude of 15.24 km. Static stability parameters and structural deformations of the Orbiter are calculated at trim conditions for the dynamic stability analysis, and the characteristics of damping in pitch are investigated for a Mach number range of 0.3 to 1.2. The calculated results for both the static and dynamic stabilities are compared with the available experimental data.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TP-1179 , A-7217
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Stability of an elastic airplane (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: FLEXSTAB computer program is used to evaluate trim state, static, and dynamic stability characteristics, inertial and aerodynamic loading, and elastic deformations of aircraft configurations at subsonic and supersonic speeds.
    Keywords: MECHANICS
    Type: ARC-11086 , NASA Tech Briefs (ISSN 0145-319X); 1; 4; P. 621
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Advanced surface paneling method for subsonic and supersonic flow (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Numerical results illustrating the capabilities of an advanced aerodynamic surface paneling method are presented. The method is applicable to both subsonic and supersonic flow, as represented by linearized potential flow theory. The method is based on linearly varying sources and quadratically varying doublets which are distributed over flat or curved panels. These panels are applied to the true surface geometry of arbitrarily shaped three dimensional aerodynamic configurations.
    Keywords: AERODYNAMICS
    Type: Proc. of the SCAR Conf., Part 1; p 25-54
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Unknown
    Investigation of flexible nozzle wall-flutter incidents in the NASA-Ames Research Center 11- by 11-foot transonic wind tunnel (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Twice during the spring of 1978, the two steel-plate 'flex-walls' that form the variable-geometry nozzle of the 11- by 11-foot tunnel at Ames Research Center experienced a severe dynamic instability. Both walls fluttered in the fundamental beam-bending mode and experienced stresses approaching the yield strength of the material. Both flutter incidents occurred at Mach numbers of about 1.15. The tunnel, operational for 24 years, had no history of such an instability. The cause of these flutter incidents, the steps taken to prevent a recurrence, and the requalification of the facility are described.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: AIAA PAPER 79-0797 , Structures, Structural Dynamics, and Materials Conference; Apr 04, 1979 - Apr 06, 1979; St. Louis, MO
    Format: text
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    NASA TECHNICAL REPORTS
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