Master Thesis - OUFTI-1

More documents

Recommendations

Info

Figure 1.4 shows the main stage of Vega during a vibration test. The LARES system is situated on the top of the stage and, on the left of this picture, one P-POD can be seen. Last year, the P-PODs were theoretically placed horizontally inside the launcher. However, in order to facilitate the access to them (e.g., for recharging the batteries), it was decided to right them at an angle of 10 ◦ from the vertical. This fact is really important to note because this modication will change signicantly the loads apply on the CubeSat. Figure 1.4: Main stage of Vega [20] This opportunity results from an initiative of ESA that, in January 2008, published a call to oer a free launch for nine CubeSats on the Vega Maiden Flight after presenting the project at the Vega Maiden Flight CubeSat Workshop at the European Space Research and Technology Center (ESTEC). The OUFTI-1 team has submitted its own proposal in March 2008 and, in June 2008, received the conrmation that OUFTI-1 will take part in the Vega Maiden Flight. The eight other selected CubeSats and their specic missions, are: • Robusta (Montpellier - France): Study of radiation eects on bipolar transistors • UWE-3 (Würzburg - Germany): Development of an active attitude control system • AtmoCube (Trieste - Italy): Space weather measurements • E-St@r (Torino - Italy): Test of an active 3-axis attitude control system • UNICubeSat (Roma - Italy): Atmospheric neutral density measurements • PW-Sat (Warsaw - Poland): Test of a deployable drag augmentation device • Goliat (Bucharest - Romania): Earth imaging and space environment measurements 17
• XatCobeo (Vigo - Spain): Development of a Software-Dened Radio (SDR) and solar panel deployment system The Vega Maiden Flight will deploy these CubeSats into an orbit of 354 × 1447 km altitude with 71 ◦ inclination. 1.2.3 Mission objectives The primary goal of the OUFTI-1 project is to provide hands-on satellite experience to students. For the OUFTI-1 project, there are three main payloads (illustrated in Figure 1.5). Figure 1.5: The three payloads of OUFTI-1 The rst one is the setting up of a functional D-STAR repeater in space. D-STAR, which stands for "Digital Smart Technology for Amateur Radio ", is a ham radio protocol recently developed by the Japan Amateur Radio League (JARL). The overall system provides a lot of new built-in features including digital communication (i.e., the quality of the data received is better than an analog signal at the same strength), simultaneous voice and data transmission (e.g., Global Positioning System (GPS) data and computer les), complete routing over the Internet and callsign-based roaming on a worldwide basis [21]. Therefore, the D-STAR system provides a new capability and functionality to the ham radio world and increases the eciency of emergency communications (e.g., during the hurricane Katrina, the whole telecommunications were out of order and it is amateur radio that allowed people to communicate with the rescue teams). This payload allows to test the performances of this protocol in space environment. 18
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: 1.2 OUFTI-1 project 1.2.1 Genesis O
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
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?