Space Propulsion - IAP/TU Wien

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Space Propulsion reaction wheel maneuvres To perform a rotational maneuver with a reaction wheel, the flywheel is accelerated by a motor. The spacecraft accelerates in the opposite direction. cont’d
eaction wheel, cont’d Space Propulsion A S/C can be rotated by an angle Θ by application of a torque T for time interval t Θ = Tt 2 2 I v this torque can be supplied by an accelerating flywheel; angular acceleration α W is supplied by a motor T α w I w = v The resulting S/C rotation angle is and the increase in wheel speed: αW I Θ = 2I W t 2 Δω w = α w t The S/C can be returned to its original position by applying the opposite torque to the flywheel; the net increase in flywheel rotational speed then is 0 (neglecting friction). Due to unbalanced torques however, the flywheel eventually will reach its upper angular speed limit and then is not fully available for maneuvering any more. To become maneuverable again it must be „unloaded“, i.e. its angular speed must be brought to 0 again. cont’d
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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 .
Page 33 and 34: Space Propulsion Check for tankage
Page 35 and 36: Space Propulsion coplanar orbit cha
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
Page 65 and 66: Space Propulsion Thruster combinati
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: Space Propulsion forced limit cycle
Page 87: eaction wheel, cont’d Space Propu
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Space Propulsion - IAP/TU Wien

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