Master Thesis - OUFTI-1

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Figure 3.5: Adaptation of the base idea to the <strong>OUFTI</strong>-1 dimensions 3.5 Battery selection Once the four holes for the endless screws are drilled, the available space for the batteries is restricted to the dimensions shown in Figure 3.6. Figure 3.6: Available space for including the batteries With these dimensions in mind, the battery selection can start. Last year, it was decided to use Lithium (Li) batteries for their compact form and their high specic capacity. Two dierent types of batteries were considered: Varta and Kokam. 49
A test under vacuum conditions was performed on these batteries and it appeared that the Kokam bulged and not the Varta. However, it should be noted that batteries from Varta presented several uncertainties in relation to their electrical capacity evolution in time. In addition, these batteries were no longer provided by the industry and, for the remaining ones, the storage conditions were not known. So, it was decided to use batteries from Kokam. The main selection criteria are: dimensions, mass, electrical capacity and, last but not least, reliability. Accounting for these restrictions, three batteries were selected. Their properties are available in Table 3.3. It should be noted that the electrical capacity of these batteries is given for standard conditions (T = 25 ◦ C, V = 2.7 − 4.2 V and q = 0.5 C). Batteries Length Width Thickness Mass Electrical capacity (mm) (mm) (mm) (g) (Ah) SLP B 554374H 73.5 ± 0.5 42.5 ± 0.5 5.4 ± 0.2 32 ± 1 1.25 SLB 603870H 69.5 ± 0.5 37.5 ± 0.5 6.5 ± 0.2 32 ± 1 1.5 SLP B 723870H4 70 ± 0.5 37.5 ± 0.5 7.2 ± 0.2 37 ± 1.5 1.5 Table 3.3: Properties of several batteries from Kokam [36] Considering the electrical capacity, <strong>OUFTI</strong>-1 needs 1.2 Ah. So, the rst battery can not be selected because the Margin of Safety (MoS) is too small in this case. In addition, this battery has dimensions that do not allow to include it in the available space described in Figure 3.6. Now, if the physical properties are also taken into account, the better solution is to use the battery Kokam SLB 603870H, which is lighter and smaller than the other one. A picture of this battery is presented in Figure 3.7. Its datasheet is available in appendix D. Figure 3.7: Battery Kokam SLB 603870H This choice, which fullls all the requirements of Structure & Conguration (STRU) 50
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 and 48: Figure 3.3: Batteries during and af
Page 49: The concept is the following one: F
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
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last versions of the Verication Con
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[13] Ph. LEDENT. "Design and Implem
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[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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