All aluminum components were made of 7075 aluminum alloy (T6), one of the two most commonly used aluminum alloys for such applications (the second one is the 6061 alloy). After a trade-off study considering stiffness and mass requirements [10], a quasi-isotropic lay-up was concluded. Assembly and integration procedure of UPSAT. The temperatures on the PCBs during the test never reached values of high risk, and all required functional tests performed during the plateaus did not indicate any malfunction on any of the PCBs. Such a study does not look at a specific frequency or amplitude at a specific moment in time but rather statistically looks at the response of the structure to a given random vibration environment. The cubesat was delivered to ISISpace in Delft on the 18th of August 2016 for the check-out process, which included several health checks on the satellite, the fit check inside a dummy POD, and full charging of the batteries.

The typical range for such missions is between 50 and 90 Hz. For PCB mounting, the commonly used solution of spacers was followed, and all PCBs along with the spacers were modelled during the finite element analysis campaign. The total mass of the flight model was found at 1.75 kg, meaning that there was almost a kilogram available for use of any extra scientific instrumentation (max allowable mass of a 2U cubesat is 2.66 kg). This is expected, since the structure was designed on the basis of a stiffness-driven approach, in order to push eigenfrequencies to higher values. Payload Mass. The authors would like to thank Dr. George Sotiriadis for his support in the manufacturing of the TVAC chamber. The experimental setup shown in Figure 14 is the same for all required vibration tests (resonance, quasistatic, random, and sine vibration). As for all space missions, including cubesats, the structure is one of the main satellite subsystems. This is a continuation of the 1U CUBESAT separated to simplify filing. The total outgassing of the materials from all subsystems should not exceed 1% of the total mass of the satellite. These components/subsystems were designed from scratch and included the electronic equipment (PCBs (printed circuit board)), solar panels on the external faces, a camera, and the antenna system on the −Z face. CAD design for the “hybrid” structure (a) and the fully assembled cubesat (b). According to QB50 functional specifications [11], the required frequency profile is from 5 to 100 Hz, in order to verify that the structures’ lowest natural frequency is above 90 Hz. Finally, UPSat was deployed from ISS, on May 18th (Figure 19(e)), and after one hour, successful contact with UPSat was achieved, with the received CW beacon and Whole Orbit Data (WOD) verifying the perfect condition of the cubesat and thus the mission success. “Amandine Denis, QB50 Systems Requirements and Recommendations (Issue 7),” 2015, February 2003, S. Jayaram and E. Gonzalez, “Design and construction of a low‐cost economical thermal vacuum chamber for spacecraft environmental testing,”. The CW beacon and WOD files confirmed the normal operation of all subsystems and make UPSat the first Greek open-source, designed-from-scratch, nanosatellite ever launched. The current work focuses on the design, verification by analysis, and test of a 2U cubesat for a specific LEO (low Earth orbit) mission (FP7-QB50 project) and also on the investigation of the use of CFRP (carbon fiber reinforced plastic) materials in space structural design. Space solar panels for nanosatellite platforms. All RMS stresses for the three scenarios of PSD analysis are extremely low and not capable of raising any concerns regarding the structure’s integrity.


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