Abstract
The method of applying deformable 2-D lattice materials in design of the main structure of a reconfigurable shaped reflector is proposed in this paper. Hex-chiral NPR (Negative Poisson's Ratio) lattice, re-entrant NPR lattice and star ZPR (Zero Poisson's Ratio) lattice are investigated in forming the main structure of a reflector, according to the mechanical properties requirement. Finite element models of reflectors built by these three types of lattice materials are developed. An example of a reflector with reconfigurable shape, which is transformed from a standard paraboloid, is given. The curvature change of the deformed shape is calculated. Then, the region with the largest curvature changing rate is found and the configuration of such area is regenerated. Finally, the surface accuracy of the region with the largest curvature changing rate is evaluated for reflectors built by the three compared lattice materials. The simulation results show that the highest surface accuracy is obtained when applying the hex-chiral lattice to the design of the reconfigurable shaped reflector.
Highlights
In recent years, due to the development and demand of satellite communication, on-orbit reconfigurable antenna has experienced great research interest and practical value
Negative Poisson's Ratio (NPR) and Zero Poisson's Ratio (ZPR) lattice materials have the potential to solve this critical problem by virtue of the in-cell deformation of the material that produces hyperbolic dome-shaped or singlecurvature arched surfaces under out-of-plane loads
To accommodate the requirements of mechanical properties and the size parameters of lattice material cells to optimize the design space, this paper investigates a variety of NPR and ZPR lattice materials and utilizes hexchiral NPR lattice, re-entrant hexagonal NPR lattice and star ZPR lattice material as the structural material of the reconfigurable shaped reflector surfaces
Summary
Due to the development and demand of satellite communication, on-orbit reconfigurable antenna has experienced great research interest and practical value. It is essential to have a type of applicable and efficiently shaped reflective surface structure material which can achieve a large deformation in the elastic range for the mechanical reconfigurable antenna field. Negative Poisson's Ratio (NPR) and Zero Poisson's Ratio (ZPR) lattice materials have the potential to solve this critical problem by virtue of the in-cell deformation of the material that produces hyperbolic dome-shaped or singlecurvature arched surfaces under out-of-plane loads. This avoids excessive stress, such as hex-chiral NPR lattice material[7], re-entrant hexagonal NPR lattice material[8], star ZPR lattice material[9]. Through comparing the highest precision that the three can achieve, the forming accuracy of the hex-chiral NPR lattice material is found to be the highest
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