Space Propulsion - IAP/TU Wien

More documents

Recommendations

Info

Space Propulsion Example 5: Repositioning Consider a geosynchronous 1t spacecraft that is required to reposition by 2-deg, counter to the velocity vector (westward), in a maneuvering time of one sidereal day (one orbit). What is the fuel consumption for that maneuver, assuming an Isp of 3100 m/s? Δφ S/C moves in reposition ellipse „placeholder“ S/C orbits in GEO example 5, cont‘d
Repositioning, cont‘d Space Propulsion The elements of a geosynchronous orbit are r = 42,164.17 km (circular) P = 86,164.09 s V = 3.07466 km/s ΔP is equal to the time required for 2 deg of motion on a geosynchronous orbit 0 Δϕ 2 *86,164.09 ΔP = P = = 360 360 478.689 [ s] The period for the spacecraft on the elliptical reposition orbit is semimajor axis of the reposition orbit P = 86,164.09 + 478.689 = 86,642.78 [s] 2 2 P μ (86,642.78) (398,600) a = 3 = 3 = 42,320 2 2 4π 4π [ km] velocity at periapsis of an elliptical orbit with semimajor axis a V 2μ μ 2(398,600) 398,600 = − = − 3.08032 r a 42164 42320 = [ km / s] velocity change to place the spacecraft on the reposition ellipse 3.08032km/s - 3.07466km/s = 5.66 m/s The same velocity change (in the opposite direction is necessary for recirculation of repositioning orbit Propellant consumption under assumption of negligible mass change ⎡ ⎛ V ⎞ ⎤ ⎧ ⎡11.32⎤ ⎫ m p m f ⎢exp⎜ Δ = ⎟ −1⎥ = 1000⎨exp −1⎬ = 3.66 I ⎢ sp ⎩ ⎣ 3100 ⎥ ⎢ ⎣ ⎝ ⎠ ⎥⎦ ⎦ ⎭ [ kg]
Page 1 and 2: Space Propulsion Pioneer 10 Pioneer
Page 3 and 4: Space Propulsion
Page 5 and 6: Space Propulsion Every particle of
Page 7 and 8: Space Propulsion Circular orbit mV
Page 9 and 10: Space Propulsion 5 3.98x10 V orb
Page 11 and 12: Space Propulsion Gravitational traj
Page 13 and 14: Space Propulsion Gravitational traj
Page 15 and 16: Space Propulsion dA 2 2 P = abπ =
Page 17 and 18: Space Propulsion The orbit of a bod
Page 19 and 20: Space Propulsion Elliptical orbits
Page 21 and 22: Space Propulsion Tsiolkovsky equati
Page 23 and 24: Space Propulsion Total impulse Tota
Page 25 and 26: Space Propulsion jet power definiti
Page 27 and 28: Space Propulsion these purely mecha
Page 29 and 30: Space Propulsion The staging princi
Page 31 and 32: 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: Space Propulsion Combined maneuver:
Page 47 and 48: Space Propulsion Basically a 3 - bo
Page 49 and 50: Space Propulsion vectorial velocity
Page 51 and 52: Space Propulsion
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 and 84: Space Propulsion forced limit cycle
Page 85 and 86: eaction wheel, cont’d Space Propu
Page 87: eaction wheel, cont’d Space Propu

Space Propulsion - IAP/TU Wien

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?