Master Thesis - OUFTI-1

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5 Complete FE analysis of OUFTI-1: Static, modal and random vibration101 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 5.2 Modeling strategy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 5.2.1 Materials properties . . . . . . . . . . . . . . . . . . . . . . . . . . 102 5.2.2 Main structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 5.2.3 Solar panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 5.2.4 Antenna support . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 5.2.5 Electronic cards and battery support . . . . . . . . . . . . . . . . . 104 5.2.6 The endless screws . . . . . . . . . . . . . . . . . . . . . . . . . . . 108 5.2.7 ADCS and THER components . . . . . . . . . . . . . . . . . . . . . 109 5.3 Static analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 5.3.1 Loads denition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110 5.3.2 Boundary conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 112 5.3.3 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 5.4 Modal analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 5.4.1 Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 5.5 Random vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117 5.6 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 6 Conclusions 120 6.1 Summary of the accomplished work . . . . . . . . . . . . . . . . . . . . . . 120 6.2 Perspectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 6.3 Parallel activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 5
List of Figures 1.1 The Pumpkin's CubeSat family . . . . . . . . . . . . . . . . . . . . . . . . 15 1.2 Poly-Picosatellite Orbital Deployer (P-POD) . . . . . . . . . . . . . . . . . 15 1.3 The new European launcher: Vega . . . . . . . . . . . . . . . . . . . . . . 16 1.4 Main stage of Vega [20] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.5 The three payloads of OUFTI-1 . . . . . . . . . . . . . . . . . . . . . . . . 18 2.1 Reference frame of OUFTI-1 . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.2 Product tree of OUFTI-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2.3 CSK structure with the FM 430 . . . . . . . . . . . . . . . . . . . . . . . . 23 2.4 Dose depth curve for OUFTI-1 orbit [6] . . . . . . . . . . . . . . . . . . . . 24 2.5 One fully-integrated solar panel of OUFTI-1 . . . . . . . . . . . . . . . . . 25 2.6 Available holes on the CSK structure for cabling path [15] . . . . . . . . . 25 2.7 Interference between solar panel clips and OUFTI-1 solar cells [15] . . . . . 26 2.8 Conguration and dimensions of the antenna support . . . . . . . . . . . . 27 2.9 Description of the port obstructed by the antenna support . . . . . . . . . 27 2.10 Principle of the OUFTI-1 ADCS subsystem [25] . . . . . . . . . . . . . . . 28 2.11 Last year's conguration of the ADCS . . . . . . . . . . . . . . . . . . . . 28 2.12 Ideal positioning of the hysteretic bars . . . . . . . . . . . . . . . . . . . . 29 2.13 Magnetic eld obtained in the hysteretic bars for the rst conguration [25] 30 2.14 Magnetic eld obtained in the hysteretic bars for the second conguration [25] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 2.15 Final conguration of the ADCS . . . . . . . . . . . . . . . . . . . . . . . . 31 2.16 Magnetic eld obtained in the hysteretic bars for the nal conguration [25] 31 2.17 Pictures of the ADCS components [25] . . . . . . . . . . . . . . . . . . . . 32 2.18 Conguration of OUFTI-1 electronic cards . . . . . . . . . . . . . . . . . . 33 2.19 Pictures of the engineering models of OUFTI-1 electronic cards . . . . . . 34 2.20 Exploded view of OUFTI-1 . . . . . . . . . . . . . . . . . . . . . . . . . . 36 3.1 Last year's design of the battery assembly . . . . . . . . . . . . . . . . . . 44 3.2 Available space under and above the batteries . . . . . . . . . . . . . . . . 45 3.3 Batteries during and after the vacuum test [15] . . . . . . . . . . . . . . . 46 3.4 Initial idea for the new design . . . . . . . . . . . . . . . . . . . . . . . . . 48 6
Page 1 and 2: University of Liège Faculty of App
Page 3 and 4: Abstract OUFTI-1, standing for "Orb
Page 5: 3.4 Initial idea . . . . . . . . .
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 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
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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
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Appendix D Datasheet of the battery
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Master Thesis - OUFTI-1

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