Master Thesis - OUFTI-1

More documents

Recommendations

Info

There is no solar panel on the face −X because the access port area can not be obstructed. The solar cells were mounted on these panels at the rate of two per panel. Their integration was performed by EADS Astrium. A picture of a fully-integrated panel is available in Figure 2.5. Schematics and exact dimensions of each of these panels are available in appendix A. Figure 2.5: One fully-integrated solar panel of OUFTI-1 One of the problem encountered is that these panels cover integrally the holes of the faces on which they are placed. So, to provide a way for the cabling path, some of them are drilled of several holes with a diameter of 3 mm. The available holes for the cabling path are presented in Figure 2.6. Figure 2.6: Available holes on the CSK structure for cabling path [15] Finally, it should be noted that these panels will be glued on the OUFTI-1 skeleton using a specic glue: epoxy Stycast 2850 (with catalyst 24 LV), chosen following an advice of Mr. Pierre ROCHUS, an engineer from Liège Space Center (CSL). For example, this glue was already used for the Planck satellite thermal test at CSL. The reasons that led us to choose the glue, are: 25
• We do not want to drill or manufacture the CSK structure in any way. Indeed, any modication of this structure involves that new space qualication tests must be performed to validate it, which is not desired in our case. • Pumpkin has also developed solar panel clips to facilitate the integration of solar panels on the CSK structure [23]. However, in our case, these clips interfere with some solar cells (as shown in Figure 2.7) and then, they can not be used to attach our solar panels to the CSK structure. Figure 2.7: Interference between solar panel clips and OUFTI-1 solar cells [15] 2.3.3 Antenna support OUFTI-1 uses two antennas, one for the downlink transmission in the Very High Frequency (VHF) band (145 MHz) and the other for the uplink transmission in the Ultra High Frequency (UHF) band (435 MHz). These antennas are made of a cupro-beryllium alloy. The antenna deployment mechanism is managed by the Mechanism (MECH) subsystem [24]. The antenna support is made of Al − 5754 and it is also hard-anodized, as the rails and feet of the skeleton, to ensure the electrical insulation of the antennas. The principle of the deployment mechanism is the following one: each antenna is rolled around the guide rails and is attached to it thanks to a wire of "Dyneema", which is an Ultra High Molecular Weight Polyethylene (UHMWPE) ber. Thirthy minutes after the deployment from the P-POD (which is a general requirement to avoid any collision between the CubeSats), the Electrical Power Supply (EPS) subsystem will deliver some electrical current to a thermal knife composed of a Titanium (T i) wire. When a current goes through this wire, it heats by Joule's eect: P = U I. This wire heats until it reaches the "Dyneema" melting point. At this moment, the antennas are released and deploy. 26
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: 2.3.2 Solar panels The armor panels
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
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
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
show all

Master Thesis - OUFTI-1

Create successful ePaper yourself

Delete template?

Save as template?