Journal ArticleDOI
Quasistatic Shape Adjustment of a 15-Meter-Diameter Space Antenna
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TLDR
In this article, a 15 meter diameter Hoop-Column antenna was analyzed and tested to study shape adjustment of the reflector surface, which consisted of finite element and least squares error analyses to minimize the surface distortions.Abstract:
A 15 meter diameter Hoop-Column antenna has been analyzed and tested to study shape adjustment of the reflector surface. The Hoop-Column antenna concept employs pretensioned cables and mesh to produce a paraboloidal reflector surface. Fabrication errors and thermal distortions may significantly reduce surface accuracy and consequently degrade electromagnetic performance. Thus, the ability to adjust the surface shape is desirable. The shape adjustment algorithm consisted of finite element and least squares error analyses to minimize the surface distortions. Experimental results verified the analysis. Application of the procedure resulted in a reduction of surface error by 38 percent. Quasi-static shape adjustment has the potential for on-orbit compensation for a variety of surface shape distortions.read more
Citations
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Deployable Tensegrity Structures for Space Applications
TL;DR: A state-of-the-art review of deployable masts and reflector antennas for space applications is presented, and it is concluded that several form-finding methods are available, but no single method is suitable for general tensegrities.
Journal ArticleDOI
Shape control of the tension truss antenna
TL;DR: In this paper, the surface sensitivity to magnitude and direction errors of the applied force, which gives the tensile force to the tension truss, is evaluated by Monte Carlo simulation.
Journal ArticleDOI
Surface error estimation and correction of a space antenna based on antenna gainanalyses
TL;DR: In this article, the Ruze equation is used to estimate the deformation of the antenna surface and the correction of this deformation is performed using surface adjustment mechanisms, which are used for a reconfigurable antenna system.
Journal ArticleDOI
Active Shape Control of a Deployable Space Antenna Reflector
Masaki Tabata,M. C. Natori +1 more
TL;DR: In this article, the authors investigated the feasibility of active shape formation or correction of a deployable space antenna reflector under the conditions of limited number of actuators and limited information of its surface shape to suppress its deformations mainly due to thermal loads.
Journal ArticleDOI
Static analysis of cable networks and their supporting structures
TL;DR: In this paper, a nonlinear static analysis method for cable structures, particularly emphasizing cable networks, is presented, where cable strains are measured from the current geometry and compressed cables are analytically disassembled with the construction of the equilibrium equation and the stiffness matrix.
References
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Near-field testing of the 15-meter hoop-column antenna
Lyle C. Schroeder,Richard R. Adams,M. C. Bailey,W. Keith Belvin,David H. Butler,Thomas G. Campbell +5 more
TL;DR: In this article, a 15m-diameter antenna was tested to verify that dimensional tolerances for acceptable performance could be achieved and to verify structural, electromagnetic, and mechanical performance predictions, and the reflector surface was adjusted to greatly improve electromagnetic performance with a finite element model and the surface measurements.
The 15 meter hoop-column antenna dynamics: Test and analysis
TL;DR: In this paper, a 15 meter model of the hoop-column antenna concept has been vibration tested for model characterization and analytical model verification and good agreement between analysis and test data was obtained only after the analytical model was refined using static test data.
Hoop/column antenna development program
TL;DR: In this paper, the development of the hoop/column spacetenna reflector is discussed, as well as mission configurations, system compatibility, deployment sequence, cable development, and ground model fabrication and assembly.
Controls-structures-electromagnetics interaction program
TL;DR: In this article, a technology development program involving Controls Structures Electromagnetics Interaction (CSEI) for large space structures was described, which was developed as part of the continuing effort following the successful kinematic deployment and RF tests of the 15 meter Hoop/Column antenna.