Modular Multifunctional Composite Structure for CubeSat Applications: Preliminary Design and Structural Analysis
Modular Multifunctional Composite Structure for CubeSat Applications: Preliminary Design and Structural Analysis
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DOI：
10.3390/aerospace7020017
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发表时间：
2020-02-01
期刊：
影响因子：
2.6
通讯作者：
Romeo, Giulio
中科院分区：
文献类型：
--
作者：
Capovilla, Giorgio;Cestino, Enrico;Romeo, Giulio
立方体卫星的主要结构通常采用铝合金，并且对于碳纤维增强塑料（CFRP）主要结构也有很多研究。航天器的内部体积通常被电池阵列占据，从而减少了有效载荷的可用体积。本文设计了一种 CFRP 结构/电池阵列配置，以便将电力系统与航天器总线主结构集成在一起。该配置是根据AraMiS项目中引入的模块化设计理念设计的。该结构适合 1U 立方体卫星的外表面。其外侧装有两个太阳能电池，另一侧装有电源系统电路。采用了创新的蜂窝结构概念，并将一组商用锂聚合物电池嵌入两个 CFRP 面板之间，并用 CFRP 肋隔开。有限元分析显示了与发射机械负载和振动的兼容性。结果表明，即使复合结构电池的结构集成度较低，相对于采用铝合金的传统功能分离结构，也可以为有效负载提供更多的体积和质量。引入低集成度是为了允许使用相对便宜的商用现成组件。
CubeSats usually adopt aluminum alloys for primary structures, and a number of studies exist on Carbon Fiber Reinforced Plastic (CFRP) primary structures. The internal volume of a spacecraft is usually occupied by battery arrays, reducing the volume available to the payload. In this paper, a CFRP structural/battery array configuration has been designed in order to integrate the electrical power system with the spacecraft bus primary structure. The configuration has been designed according to the modular design philosophy introduced in the AraMiS project. The structure fits on an external face of a 1U CubeSat. Its external side houses two solar cells and the opposite side houses power system circuitry. An innovative cellular structure concept has been adopted and a set of commercial LiPo batteries has been embedded between two CFRP panels and spaced out with CFRP ribs. Compatibility with launch mechanical loads and vibrations has been shown with a finite element analysis. The results suggest that, even with a low degree of structural integration applied to a composite structural battery, more volume and mass can be made available for the payload, with respect to traditional, functionally separated structures employing aluminum alloy. The low degree of integration is introduced to allow the use of relatively cheap and commercial-off-the-shelf components.