Master Thesis - OUFTI-1

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Figure 2.15: Final conguration of the ADCS This improves the overall system eciency and leads to an optimal solution (the magnetic eld inside each hysteretic bar is represented in Figure 2.16). Figure 2.16: Magnetic eld obtained in the hysteretic bars for the nal conguration [25] Pictures of the permanent magnet and hysteretic bars (these ones are not yet manufactured to the good dimensions) are shown in Figure 2.17. 31
Figure 2.17: Pictures of the ADCS components [25] 2.3.5 Electronic cards and battery support <strong>OUFTI</strong>-1 disposes of ve electronic cards. These cards are all based on the P C 104 standard [26]. The particularity of this standard is the P C 104 connector. This device, with 104 pins welded on it, allows a direct connection between all the cards of <strong>OUFTI</strong>-1. The PCBs are all made of Flame Resistant (FR) 4 that belongs to the class of Glass Fiber Reinforced Plastic (GFRP) material. The conguration for these cards, shown in Figure 2.18, is based on the following requirements: • The FM 430 card is placed in the bottom of the satellite, because it is on this card that the access ports are placed. So, these ports have to be placed in front of the holes of the chassis provided for this purpose, which are situated on the base plate. • The OBC 2 card is placed just above the FM 430 card. The reason is that these two cards have to communicate continuously so, to avoid a complicate cabling path, they are placed as close as possible one from the other. These two cards are managed by the student in charge of the OBC subsystem [27]. • Then, we choose to integrate the EPS card, because it is on this card that there is most components and, consequently, it is the card with the greatest mass. So, its location aects seriously the position of the CoG and, to respect the CubeSat standard requirement on the CoG location, it is better to place it as close as possible from the CubeSat geometric center. • For the same reason, the battery support comes next. Further detail will be available on chapter 3. • The fourth card is the xEPS one. The reason is the same that one for the two OBC cards (these cards have to be linked by several wires). However, in addition, we 32
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: Figure 2.13: Magnetic eld obtained
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 and 48: Figure 3.3: Batteries during and af
Page 49 and 50: The concept is the following one: F
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
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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
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Figure 4.18: MAC matrix using the s
Page 95 and 96:
4.3.6 Application of the local mass
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ρ P C 104 connector = 10.12 × 10
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According to this particular shape,
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This is due to the fact that this c
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environment. Then, this model is ex
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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
Page 123 and 124:
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
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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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