STRUCTURE DESIGN OF CARBON FIBER GRID SANDWICH REFLECTOR WITH HIGHSTABILITY AND OPTIMIZATION OF THERMAL DEFORMATION

Abstract

Abstract: To control thermal deformation of reflecting surface of satellite-borne reflector during orbit operation, a high stable carbon fiber grid sandwich structure with simple manufacturing process was designed for a paraboloid reflector with a diameter of 1.2 m. A numerical simulation method was established to predict thermal deformation of reflecting surface. On this basis, influence of different structural parameters of grid core on thermal deformation of reflecting surface was studied, and optimization of these structural parameters was performed with root mean square (RMS) of thermal deformation as indicator. And then, the reflector with optimized structure was manufactured and thermal deformation of reflecting surface was measured at low temperature using digital close-range photogrammetry to verify the validity of the numerical simulation method. At last, the influence of resin film for surface restoration on thermal deformation of reflecting surface was further studied. The results demonstrate that the RMS of thermal deformation of reflecting surface after structural optimization is 4.03 μm under uniform temperature field of -80 ℃~25 ℃, which meets the application requirement of submillimeter wave antenna. And RMS of thermal deformation of reflecting surface increases linearly with the increase of thickness and linear expansion coefficient of resin film for surface restoration. Therefore, thickness of the resin film must be strictly controlled and resin with low linear expansion coefficient should be selected during the surface restoration process.

Key words: grid sandwich, reflector, structure design, surface, thermal deformation, composites

CLC Number:

TB332

ZHANG Wei-bo, ZHANG Qi, XU Hong-tao, JU Bo-wen. STRUCTURE DESIGN OF CARBON FIBER GRID SANDWICH REFLECTOR WITH HIGHSTABILITY AND OPTIMIZATION OF THERMAL DEFORMATION[J]. Composites Science and Engineering, 2020, 0(5): 40-46.

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