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  • 1
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    Box truss antenna technology status (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Recent technology development activities for box truss structures and box truss antennas are summarized. Three primary activities are discussed: the development of an integrated analysis system for box truss mesh antennae; dynamic testing to characterize the effect of joint free play on the dynamic behavior of box truss structures; and fabrication of a 4.5 meter diameter offset fed mesh reflector integrated to an all graphite epoxy box truss cube.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA. Langley Research Center NASA(DOD Control)Structures Interaction Technology, 1986; p 145-148
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Box truss antenna technology status (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Recent technology development activities for box truss structures and box truss antennas are summarized. Three primary activities are discussed: the development of an integrated analysis system for box truss mesh antennae; dynamic testing to characterize the effect of joint free play on the dynamic behavior of box truss structures; and fabrication of a 4.5 meter diameter offset fed mesh reflector integrated to an all graphite epoxy box truss cube.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-Langley Research Center NASA(DOD Control)Structures Interaction Technology, 1986; p 717-736
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Integrated analysis system for box truss antenna mesh performance (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An integrated analysis system has been developed to more efficiently design and analyze the mesh reflective surface and the mesh tie system of the box truss antenna. Six integrated computer programs using nonlinear finite-element, surface topography and interpolation, and RF aperture integration techniques, analyze the effects of manufacturing errors, mesh pillowing, and operating environment on antenna performance. The level of rigor of analysis can be varied, providing the possibility of a lower cost preliminary study on various designs using a minimum number of reduced box section models. By including the random and systematic errors with the aperture integration of minimum rms reflector surface roughness, the RF Performance Solver determines the far-field pattern, including the beam efficiency, and thus the antenna performance of the mesh reflector antenna.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 86-0663
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Box truss analysis and technology development. Task 1: Mesh analysis and control (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An analytical tool was developed to model, analyze and predict RF performance of box truss antennas with reflective mesh surfaces. The analysis system is unique in that it integrates custom written programs for cord tied mesh surfaces, thereby drastically reducing the cost of analysis. The analysis system is capable of determining the RF performance of antennas under any type of manufacturing or operating environment by integrating together the various disciplines of design, finite element analysis, surface best fit analysis and RF analysis. The Integrated Mesh Analysis System consists of six separate programs: The Mesh Tie System Model Generator, The Loadcase Generator, The Model Optimizer, The Model Solver, The Surface Topography Solver and The RF Performance Solver. Additionally, a study using the mesh analysis system was performed to determine the effect of on orbit calibration, i.e., surface adjustment, on a typical box truss antenna.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-172570 , NAS 1.26:172570 , MCR-85-533
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Operational fitness of box truss antennas in response to dynamic slewing (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A parametric study was performed to define slewing capability of large satellites along with associated system changes or subsystem weight and complexity impacts. The satellite configuration and structural arrangement from the Earth Observation Spacecraft (EOS) study was used as the baseline spacecraft. Varying slew rates, settling times, damping, maneuver frequencies, and attitude hold times provided the data required to establish applicability to a wide range of potential missions. The key elements of the study are: (1) determine the dynamic transient response of the antenna system; (2) calculate the system errors produced by the dynamic response; (3) determine if the antenna has exceeded operational requirements at completion of the slew, and if so; (4) determine when the antenna has settled to the operational requirements. The slew event is not considered complete until the antenna is within operational limits.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-CR-172470 , NAS 1.26:172470 , MCR-84-594
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    The 15-meter diameter mechanically scanned deployable antenna (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A preliminary design with structural model data and thermal-performance estimates of a 15-meter mechanically scanned deployable antenna (MSDA) that could be launched onboard a Shuttle Orbiter to provide radiometric brightness temperature maps of the Earth and oceans in selected bands over a frequency range from 1.4 to 11 GHz is provided. The study objectives were met through the design of a unique, integrated, offset feed mast and reflector design that uses the deployable box-truss structure as a building block. The performance of this system is summarized. The all graphite-epoxy, 4.57-meter prototype cube that was completed in 1981 and is proposed for this reflector and feed mast design is presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-170576 , NAS 1.26:170576 , MCR-82-1307
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The integration of a mesh reflector to a 15-foot box truss structure. Task 3: Box truss analysis and technology development (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: To demonstrate the design and integration of a reflective mesh surface to a deployable truss structure, a mesh reflector was installed on a 15 foot box truss cube. The specific features demonstrated include: (1) sewing seams in reflective mesh; (2) mesh stretching to desired preload; (3) installation of surface tie cords; (4) installation of reflective surface on truss; (5) setting of reflective surface; (6) verification of surface shape/accuracy; (7) storage and deployment; (8) repeatability of reflector surface; and (9) comparison of surface with predicted shape using analytical methods developed under a previous task.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-178228 , NAS 1.26:178228 , MCR-86-669-TASK-3
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Satellite voice broadcast. Volume 2: System study (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Technical Volume of the Satellite Broadcast System Study is presented. Designs are synthesized for direct sound broadcast satellite systems for HF-, VHF-, L-, and Ku-bands. Methods are developed and used to predict satellite weight, volume, and RF performance for the various concepts considered. Cost and schedule risk assessments are performed to predict time and cost required to implement selected concepts. Technology assessments and tradeoffs are made to identify critical enabling technologies that require development to bring technical risk to acceptable levels for full scale development.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-175017 , NAS 1.26:175017 , MTR-85-556-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    System and structural dynamic observations of a slewed box truss antenna (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A parametric analysis was performed in order to define the slewing capability of the Earth Observation Spacecraft (EOS) box-truss antenna. The input data for the analysis consisted of the slew rate, settling time, damping, maneuver frequencies, and attitude hold times of the antenna. The dynamic transient response of the antenna was evaluated, and the results are compared with NASA operational requirements. The results of the parametric analysis are summarized in a series of tables.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 85-0821 , Structures, Structural Dynamics, and Materials Conference; Apr 15, 1985 - Apr 17, 1985; Orlando, FL
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Satellite voice broadcast. Volume 1: Executive summary (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An Executive Summary of the Satellite Voice Broadcast System Study designs are synthesized for direct sound broadcast satellite systems for HF-, VHF-, and Ku-bands. Methods are developed and used to predict satellite weight, volume, and RF performance for the various concepts considered. Cost and schedule risk assessments are performed to predict time and cost required to implement selected concepts. Technology assessments and tradeoffs are made to identify critical enabling technologies that require development to bring technical risk to acceptable levels for full scale development.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-175016 , NAS 1.26:175016
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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