Master Thesis - OUFTI-1

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3.5 Adaptation of the base idea to the OUFTI-1 dimensions . . . . . . . . . . 49 3.6 Available space for including the batteries . . . . . . . . . . . . . . . . . . 49 3.7 Battery Kokam SLB 603870H . . . . . . . . . . . . . . . . . . . . . . . . . 50 3.8 Classication by density and Young's modulus . . . . . . . . . . . . . . . . 53 3.9 Classication by density and yield stress . . . . . . . . . . . . . . . . . . . 54 3.10 Polyimide thermofoil heater . . . . . . . . . . . . . . . . . . . . . . . . . . 55 3.11 Thermostat Klixon 4BT − 2 . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.12 Connection with four thermostats . . . . . . . . . . . . . . . . . . . . . . . 57 3.13 Thermal insulator: Polyester netting . . . . . . . . . . . . . . . . . . . . . 58 3.14 Thickness of the box's "base plate" . . . . . . . . . . . . . . . . . . . . . . 59 3.15 P C 104 connector's hole . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 3.16 Reinforcers and connection holes . . . . . . . . . . . . . . . . . . . . . . . . 60 3.17 Final design of the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 3.18 Schematics of the box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3.19 Reinforcements around the connection holes . . . . . . . . . . . . . . . . . 61 3.20 Notches for the thermostats . . . . . . . . . . . . . . . . . . . . . . . . . . 62 3.21 End stops . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 3.22 Final design of the cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 3.23 Schematics of the cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 3.24 Maximal Von Mises stress inside the support . . . . . . . . . . . . . . . . . 67 3.25 The two most signicant modes of the battery support . . . . . . . . . . . 69 3.26 A rst rough shape of the battery support . . . . . . . . . . . . . . . . . . 70 4.1 Example of manufacturing variation [44] . . . . . . . . . . . . . . . . . . . 74 4.2 Example of dierences between the values provided by manufacturers and the values determined by experimental tests [44] . . . . . . . . . . . . . . . 75 4.3 Illustration of the experimental set-up for a static bend test . . . . . . . . 75 4.4 Illustration of the experimental set-up for a torsion test [44] . . . . . . . . 76 4.5 MAC between the two models . . . . . . . . . . . . . . . . . . . . . . . . . 78 4.6 Symmetrical modes of the steel plate . . . . . . . . . . . . . . . . . . . . . 78 4.7 Detailed model of a component [45] . . . . . . . . . . . . . . . . . . . . . . 79 4.8 Illustration of the dierent simplication methods [45] . . . . . . . . . . . . 80 4.9 Illustration of the dierent categories of components [45] . . . . . . . . . . 81 4.10 Illustration of the peak-amplitude method [53] . . . . . . . . . . . . . . . . 83 4.11 Location of the OBC 2 card in OUFTI-1 . . . . . . . . . . . . . . . . . . . 85 4.12 Components classication of the OBC 2 card . . . . . . . . . . . . . . . . . 86 4.13 Catia modeling of the OBC 2 card . . . . . . . . . . . . . . . . . . . . . . 87 4.14 Example of spacecraft stiness requirements for dierent launchers . . . . . 88 4.15 Location of measurement and excitation points . . . . . . . . . . . . . . . . 90 4.16 Experimental set-up for the test of the OBC 2 card . . . . . . . . . . . . . 90 4.17 Global FRF of the OBC 2 card . . . . . . . . . . . . . . . . . . . . . . . . 91 7
4.18 MAC matrix using the simple method . . . . . . . . . . . . . . . . . . . . 92 4.19 MAC matrix using the global mass smearing method . . . . . . . . . . . . 93 4.20 MAC matrix using the local mass smearing method . . . . . . . . . . . . . 95 4.21 MAC matrix using the homemade method . . . . . . . . . . . . . . . . . . 96 4.22 Initial shape of the OBC 2 card's fourth mode . . . . . . . . . . . . . . . . 97 4.23 Mode shapes obtained by adding sensors of several mass to the FE model . 98 4.24 Inuence of a change of modeling strategy for the P C 104 connector on the OBC 2 card's fourth mode . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 5.1 Illustration of a "glue" assembly [56] . . . . . . . . . . . . . . . . . . . . . 103 5.2 The FM 430 card from Pumpkin . . . . . . . . . . . . . . . . . . . . . . . 105 5.3 The OBC 2 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 5.4 The EPS card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 5.5 The xEPS card developed in collaboration with Thales Alenia Space ETCA 107 5.6 Modeling of the midplane standos . . . . . . . . . . . . . . . . . . . . . . 109 5.7 Illustration of the worst case conguration . . . . . . . . . . . . . . . . . . 110 5.8 Frame rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 5.9 Illustration of the complete quasi-static loading state of OUFTI-1 . . . . . 112 5.10 Displacements of OUFTI-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 5.11 Maximal Von Mises stress inside OUFTI-1 . . . . . . . . . . . . . . . . . . 114 5.12 First mode of OUFTI-1 (325.51 Hz) . . . . . . . . . . . . . . . . . . . . . 116 5.13 Second mode of OUFTI-1 (333.92 Hz) . . . . . . . . . . . . . . . . . . . . 116 5.14 PSD of several LVs at qualication level [60] . . . . . . . . . . . . . . . . . 117 5.15 Precise PSD of Vega [57] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 6.1 Schemas of solar panels +X and +/ − Y [15] . . . . . . . . . . . . . . . . . 130 6.2 Schemas of the solar panel +Z [15] . . . . . . . . . . . . . . . . . . . . . . 131 6.3 Schemas of the solar panel −Z [15] . . . . . . . . . . . . . . . . . . . . . . 131 6.4 Schemas of electronic cards [15] . . . . . . . . . . . . . . . . . . . . . . . . 132 6.5 Available volume for each electronic card [62] . . . . . . . . . . . . . . . . . 133 6.6 Fixations of endless screws on the base plate [62] . . . . . . . . . . . . . . 134 6.7 Picture of the xation between one midplane stando and the chassis [33] . 135 6.8 Disposition of midplane standos inside the CubeSat [30] . . . . . . . . . . 135 6.9 Datasheet of the battery Kokam SLB 603870H . . . . . . . . . . . . . . . 137 8
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: List of Figures 1.1 The Pumpkin's C
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 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
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• So, it was decided to use two t
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is to prevent the batteries' bulge.
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• Then, the thermostats, that wil
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Figure 3.23: Schematics of the cove
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• Other components, including the
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3.9.3 Dynamic behavior Finally, it
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3.10 Summary Through this chapter,
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Chapter 4 Electronic cards dynamic
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Figure 4.1: Example of manufacturin
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Figure 4.4: Illustration of the exp
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Figure 4.5: MAC between the two mod
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• Global mass/stiness smearing me
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4.2.6 Modeling of the chassis A gen
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Q = ω k = 1 ω b − ω a 2 ζ ⇒
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Their study was based on the fact t
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Figure 4.14: Example of spacecraft
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Figure 4.15: Location of measuremen
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Figure 4.18: MAC matrix using the s
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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
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Components Young's moduli (GP a) Po
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Components Young's moduli (GP a) Po
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5.3 Static analysis As described in
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Figure 5.9: Illustration of the com
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Figure 5.11: Maximal Von Mises stre
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Figure 5.12: First mode of OUFTI-1
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Figure 5.15: Precise PSD of Vega [5
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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 ".
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Appendix A Schemas of solar panels
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Appendix B Schemas of electronic ca
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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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