Design of a multifunctional composite structure for modular CubeSat applications

Abstract

CubeSats primary structures are usually made with aluminium alloys, with few examples of CFRP primary structures under study. Power system battery arrays usually occupy spacecraft internal volume and mass that should be available to the payload. A CFRP structural/battery array configuration has been designed, allowing to integrate the electrical power system in the bus primary structure. Its configuration has been developed with the modular design philosophy of the AraMiS CubeSat. It is sized as a tile, mounted on an external face of the 1U CubeSat. It accommodates two solar cells, while the opposite face accommodates power system circuitry. Following a cellular structure concept, a set of commercial LiPo batteries has been placed between two CFRP panels and spaced out with CFRP ribs. Compliance with launch mechanical loads has been evaluated with a finite element analysis. A preliminary thermal analysis has been performed to simulate a LEO orbit environment. The results indicate that even with a low degree of structural integration, more volume and mass can be allocated to the payload, with respect to traditional, functionally separated designs in aluminium alloy. The low degree of integration allows to employ relatively cheap, commercial off-the-shelf components.

Optimized Design and Multiphysics Analysis of a Ka-Band Stacked Antenna for CubeSat Applications

“…However, the physical specifications for the spacecraft and its sub-systems cannot be neglected. The mechanical and thermal environments that the satellite antenna must face in outer space are very complicated and harsh [1], [4], [11]. For instance, the antenna must be manufactured with materials that comply with mechanical and thermal constraints of space missions [11].…”