Master Thesis - OUFTI-1

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Components Mass (g) 4 spacers 25 mm 4 × 0.475 = 1.9 4 T i screws 4 × 0.86 = 3.44 4 T i spacers 4 × 0.29 = 1.16 4 T i nuts 4 × 2.32 = 9.28 2 heaters 2 × 1.5 = 3 Heaters' control system 10 Radiative insulation 15 16 thermal washers 16 × 0.08125 = 1.3 Battery PCB 15.5 2 batteries Kokam SLB 603870H 2 × 33 = 66 4 wires 4 × 2 = 8 Total 134.58 Table 3.1: Available mass budget To this result, some important corrections must be added. These corrections, which came from revisions or improvements of designs, are related in Table 3.2. Components Last year's mass (g) This year's mass (g) Dierences (g) Thermal knife 19 0.5 + 18.5 Permanent magnet 13 3 + 10 Hysteretic bars 14 3 + 11 COM card 75 65 + 10 Total 121 71.5 + 49.5 Table 3.2: Important corrections in the mass budget So, the total available mass budget for the new support is: 103.79 + 49.5 = 153.29 g. 3.4 Initial idea The base idea of the new support was imagined by Jean-Philippe NOEL, who is in charge of the THER subsystem [35]. The idea is the following one: instead of placing the batteries one on the other, it was a better idea to place them one next to the other. This new conguration allows to release more space between the batteries and the electronic cards for integrating the box. An illustration of this new design is available in Figure 3.4. 47
The concept is the following one: Figure 3.4: Initial idea for the new design • The support is composed of two dierent parts: one box, in which the batteries will be placed, and one cover, which will prevent the batteries' bulge. These two parts will be connected together by several screws. • The assembly will be supported by the four endless screws, just like all the electronic cards. So, new spacers will have to be designed to replace the 25 mm ones that previously separated the EPS card from the xEPS card. Their length will be determined later. • The box is composed of a "base plate" with reinforcers. The holes situated at the level of the batteries' width are there to allow the wires to come out of the box. Starting from this idea, the support was adapted to the <strong>OUFTI</strong>-1 dimensions. It was decided to place it with the box on the side of the xEPS card. This detail has to be noted because the four endless screws are not placed symmetrically inside the CubeSat so, the direction in which the support will be integrated, takes on all its importance. This choice is based on the CubeSat standard requirement about the CoG location already mentioned in section 2.4.2. The result obtained is given in Figure 3.5. 48
Page 1 and 2: University of Liège Faculty of App
Page 3 and 4: Abstract OUFTI-1, standing for "Orb
Page 5 and 6: 3.4 Initial idea . . . . . . . . .
Page 7 and 8: List of Figures 1.1 The Pumpkin's C
Page 9 and 10: 4.18 MAC matrix using the simple me
Page 11 and 12: List of Acronyms ADCS Al AlNiCo ASI
Page 13 and 14: Thesis outline This thesis focuses
Page 15 and 16: of larger satellites. So, the CubeS
Page 17 and 18: 1.2 OUFTI-1 project 1.2.1 Genesis O
Page 19 and 20: • XatCobeo (Vigo - Spain): Develo
Page 21 and 22: Chapter 2 OUFTI-1: Flight system co
Page 23 and 24: Figure 2.2: Product tree of OUFTI-1
Page 25 and 26: 2.3.2 Solar panels The armor panels
Page 27 and 28: • We do not want to drill or manu
Page 29 and 30: In our case, because of the limited
Page 31 and 32: Figure 2.13: Magnetic eld obtained
Page 33 and 34: Figure 2.17: Pictures of the ADCS c
Page 35 and 36: consider the possibility of oshorin
Page 37 and 38: Figure 2.20: Exploded view of OUFTI
Page 39 and 40: I xx , I yy and I zz are called the
Page 41 and 42: Subsystem: Structure & Conguration
Page 43 and 44: Subsystem: Thermal Control Parts Co
Page 45 and 46: Chapter 3 Design of a new support f
Page 47: Figure 3.3: Batteries during and af
Page 51 and 52: A test under vacuum conditions was
Page 53 and 54: Thermal Expansion (CTE) of the mate
Page 55 and 56: Figure 3.9: Classication by density
Page 57 and 58: The last property to determine is t
Page 59 and 60: • So, it was decided to use two t
Page 61 and 62: is to prevent the batteries' bulge.
Page 63 and 64: • Then, the thermostats, that wil
Page 65 and 66: Figure 3.23: Schematics of the cove
Page 67 and 68: • Other components, including the
Page 69 and 70: 3.9.3 Dynamic behavior Finally, it
Page 71 and 72: 3.10 Summary Through this chapter,
Page 73 and 74: Chapter 4 Electronic cards dynamic
Page 75 and 76: Figure 4.1: Example of manufacturin
Page 77 and 78: Figure 4.4: Illustration of the exp
Page 79 and 80: Figure 4.5: MAC between the two mod
Page 81 and 82: • Global mass/stiness smearing me
Page 83 and 84: 4.2.6 Modeling of the chassis A gen
Page 85 and 86: Q = ω k = 1 ω b − ω a 2 ζ ⇒
Page 87 and 88: Their study was based on the fact t
Page 89 and 90: Figure 4.14: Example of spacecraft
Page 91 and 92: Figure 4.15: Location of measuremen
Page 93 and 94: Figure 4.18: MAC matrix using the s
Page 95 and 96: 4.3.6 Application of the local mass
Page 97 and 98: ρ P C 104 connector = 10.12 × 10
Page 99 and 100:
According to this particular shape,
Page 101 and 102:
This is due to the fact that this c
Page 103 and 104:
environment. Then, this model is ex
Page 105 and 106:
5.2.4 Antenna support For the anten
Page 107 and 108:
Components Young's moduli (GP a) Po
Page 109 and 110:
Components Young's moduli (GP a) Po
Page 111 and 112:
5.3 Static analysis As described in
Page 113 and 114:
Figure 5.9: Illustration of the com
Page 115 and 116:
Figure 5.11: Maximal Von Mises stre
Page 117 and 118:
Figure 5.12: First mode of OUFTI-1
Page 119 and 120:
Figure 5.15: Precise PSD of Vega [5
Page 121 and 122:
Chapter 6 Conclusions This master t
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provided for each method used. We h
Page 125 and 126:
last versions of the Verication Con
Page 127 and 128:
[13] Ph. LEDENT. "Design and Implem
Page 129 and 130:
[40] "Dejond - Aluminum Catalog ".
Page 131 and 132:
Appendix A Schemas of solar panels
Page 133 and 134:
Appendix B Schemas of electronic ca
Page 135 and 136:
Appendix C Fixations of the endless
Page 137 and 138:
Appendix D Datasheet of the battery
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Master Thesis - OUFTI-1

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