Master Thesis - OUFTI-1

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4.3.5 Application of the global mass smearing method The second method to be applied is the global mass smearing method. In this method, the mass of each component is spread out over the entire area of the PCB. So, the global density is obtained by dividing the mass of the complete electronic card by the volume of the PCB. This calculation is realized in Equation 4.3.1. ρ global = m OBC 2 50.4607 × 10−3 = = 3536.1388 kg/m 3 (4.3.1) V P CB 1.427 × 10 −5 The results are presented in Table 4.4 and in Figure 4.19. Corresponding modes Frequency deviations (%) 1 21.89 2 30.07 Table 4.4: Frequency deviations between corresponding modes using the global mass smearing method Figure 4.19: MAC matrix using the global mass smearing method It can be remarked that the results are better than the ones obtained using the simple method. So, this method is more accurate than the preceding one (which is in accordance with the theory). 93
4.3.6 Application of the local mass smearing method The third method to be applied is the local mass smearing method. In this method, the mass of each component is spread out over local regions of the PCB. So, the density of the PCB is locally increased. The value of this increase can be calculated by dividing the mass of each component by the product between the base area of the component and the thickness of the PCB. The increase of density caused by each component is presented in Table 4.5. Components Equivalent densities (kg/m 3 ) P C 104 connector 15308.5 I 2 C − EEP ROM 2717.2 MAX 890 2335.3 MSP 430 2068.2 Crystal 32.768 kHz 3816.4 JT AG connector 4275.9 Table 4.5: Increases of density due to each component of the OBC 2 card The results are presented in Table 4.6 and in Figure 4.20. Corresponding modes Frequency deviations (%) 1 21.46 2 25.98 Table 4.6: Frequency deviations between corresponding modes using the local mass smearing method Once again, it can be remarked that the results are better than the ones obtained using the global mass smearing method. So, this method is more accurate than the preceding one (which is in accordance with the theory). 94
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University of Liège Faculty of App
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Abstract OUFTI-1, standing for "Orb
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3.4 Initial idea . . . . . . . . .
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List of Figures 1.1 The Pumpkin's C
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4.18 MAC matrix using the simple me
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List of Acronyms ADCS Al AlNiCo ASI
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Thesis outline This thesis focuses
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of larger satellites. So, the CubeS
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1.2 OUFTI-1 project 1.2.1 Genesis O
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• XatCobeo (Vigo - Spain): Develo
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Chapter 2 OUFTI-1: Flight system co
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Figure 2.2: Product tree of OUFTI-1
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2.3.2 Solar panels The armor panels
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• We do not want to drill or manu
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In our case, because of the limited
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Figure 2.13: Magnetic eld obtained
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Figure 2.17: Pictures of the ADCS c
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consider the possibility of oshorin
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Figure 2.20: Exploded view of OUFTI
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I xx , I yy and I zz are called the
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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
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: Figure 4.18: MAC matrix using the s
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
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
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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