高稳定碳纤维格栅夹层反射器结构设计及型面热变形优化

摘要/Abstract

摘要： 为控制星载反射器在轨运行期间的型面热变形,本文以一口径为1.2 m的抛物面反射器为研究对象,设计出一种制造工艺简单的高稳定碳纤维格栅夹层结构。首先,建立预测型面热变形的数值模拟方法,探究格栅芯子的结构参数对型面热变形的影响,以热变形均方根(RMS)为指标优化格栅的结构形式。然后,按照优化后的结构形式制备反射器,采用近景摄影技术测量低温下的型面热变形,验证了数值模拟方法的有效性。最后,研究了上蒙皮表面的树脂修型膜对型面热变形的影响规律。结果表明:优化后的格栅夹层反射器在-80 ℃~25 ℃均匀温度场下的型面热变形RMS为4.03 μm,满足亚毫米波天线的使用要求;型面热变形RMS随树脂修型膜厚度和线膨胀系数的增加呈线性增加,因此在修型工艺中应严格控制树脂修型膜的厚度并选用低线膨胀系数的树脂。

关键词: 格栅夹层, 反射器, 结构设计, 型面, 热变形, 复合材料

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

中图分类号:

TB332

张尉博, 张琦, 徐宏涛, 鞠博文. 高稳定碳纤维格栅夹层反射器结构设计及型面热变形优化[J]. 复合材料科学与工程, 2020, 0(5): 40-46.

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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