Space Propulsion - IAP/TU Wien

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eaction wheel, cont’d Space Propulsion total angular momentum of a fully loaded wheel is H = I w ω w , max to unolad the wheel, a torque in the opposite direction must be applied to it by the motor for a certain time; in order not to produce net rotation of the S/C, an equal and opposite momentum must be supplied by the thrusters: H = Tt = nFLt time required for unloading is t = H nFL = I w ω w, nFL max propellant consumption for unloading is m p nF. t = . I sp L L = I wωw LI sp cont’d
eaction wheel, cont’d Space Propulsion Example 9: Reaction Wheel Unloading How much propellant does it take to unload one of the Magellan wheels, and how long does it take? (JPL Venus Mission, 1994) The Magellan wheel characteristics are: maximum momentum = 27 N-m-s maximum wheel speed = 4000 rpm = 418.879 rad/s The thruster pair to be used has the following characteristics: thrust = 1 N; moment arm = 2m pulsing specific impulse 1500 m/s. the propellant mass required to unload it is m H LI 27 = 2*1500 p = = sp 0.009 [ kg] engine burn time required to unload is H 27 t = = = 6.75 nFL 2*1*2 [ s]
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Space Propulsion Pioneer 10 Pioneer
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Space Propulsion
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Space Propulsion Every particle of
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Space Propulsion Circular orbit mV
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Space Propulsion 5 3.98x10 V orb
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Space Propulsion Gravitational traj
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Space Propulsion Gravitational traj
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Space Propulsion dA 2 2 P = abπ =
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Space Propulsion The orbit of a bod
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Space Propulsion Elliptical orbits
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Space Propulsion Tsiolkovsky equati
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Space Propulsion Total impulse Tota
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Space Propulsion jet power definiti
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Space Propulsion these purely mecha
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Space Propulsion The staging princi
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Space Propulsion m i = ρmL + ψ .
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Space Propulsion Check for tankage
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Page 37 and 38: Space Propulsion Example 1: Simple
Page 39 and 40: Space Propulsion Hohmann transfer:
Page 41 and 42: Space Propulsion Velocity increase
Page 43 and 44: Space Propulsion Combined maneuver:
Page 45 and 46: Repositioning, cont‘d Space Propu
Page 47 and 48: Space Propulsion Basically a 3 - bo
Page 49 and 50: Space Propulsion vectorial velocity
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Page 53 and 54: Space Propulsion CASSINI probe to S
Page 55 and 56: Space Propulsion Liftoff from groun
Page 57 and 58: Space Propulsion Spiraling up dv dt
Page 59 and 60: Space Propulsion Spiraling up time
Page 61 and 62: Space Propulsion Comparison of Hohm
Page 63 and 64: Space Propulsion Attitude maneuvres
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Page 67 and 68: Space Propulsion Attitude control t
Page 69 and 70: Space Propulsion Kinetics for rotat
Page 71 and 72: Space Propulsion one - axis maneuvr
Page 73 and 74: Space Propulsion Example 6: One-Axi
Page 75 and 76: Space Propulsion Example 7: Precess
Page 77 and 78: limit cycle cont‘d Space Propulsi
Page 79 and 80: Space Propulsion Example 8: Limit-C
Page 81 and 82: Space Propulsion dir. of ext. torqu
Page 83 and 84: Space Propulsion forced limit cycle
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Space Propulsion - IAP/TU Wien

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