Lunar descent trajectory
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Lunar Descent Trajectory. February 19 th , 2009. Descent Trajectory. Steering Program Descent times >1000s, working on better model Gimbaled Engine No savings until arbitrary payload case. Useful Numbers/Recommendations.

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Lunar Descent Trajectory

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Lunar descent trajectory

Lunar Descent Trajectory

February 19th, 2009

[John Aitchison] [Mission Ops]


Descent trajectory

Descent Trajectory

[John Aitchison] [Mission Ops]

  • Steering Program

    • Descent times >1000s, working on better model

  • Gimbaled Engine

    • No savings until arbitrary payload case


Useful numbers recommendations

Useful Numbers/Recommendations

[John Aitchison] [Mission Ops]

  • 1 additional kg on lunar surface ≈ 2.1 kg additional kg in lunar orbit

  • 2000 km circular lunar parking = add 55kg descent prop mass!!

    • Use EP as long as possible

  • Stay above 20 km until final descent

    Also: Altitude Sensor

    System Updates


Assumptions on first slide

Assumptions on First Slide

[John Aitchison] [Mission Ops]

  • Graph 1

    • 110km, 15km orbit; vertical to horizontal burn; constant 2000 N thrust; constant mdot=.67 kg/s

  • Graph 2

    • Graph 1 assumptions; 315kg wet mass; worst case mountain scenario

  • Graph 3

    • Added prop to get to 110km circular; instantaneous deltaV; Hohmann transfers


Updated lunar descent masses

Updated Lunar Descent Masses

[John Aitchison] [Mission Ops]

4


Landed mass vs prop mass also basis of eom code

Landed Mass vs. Prop Mass-Also basis of EOM code

[John Aitchison] [Mission Ops]


Landed mass vs prop mass cont

Landed Mass vs. Prop Mass (cont.)

[John Aitchison] [Mission Ops]


Lunar descent trajectory

Landed Mass vs. Prop Mass (cont.)

[John Aitchison] [Mission Ops]


Lunar descent trajectory

Landed Mass vs. Prop Mass (cont.)

[John Aitchison] [Mission Ops]


Effects of non 110km circ orbit

Effects of Non 110km Circ Orbit

[John Aitchison] [Mission Ops]


Effects of non 110km circ orbit cont

Effects of Non 110km Circ Orbit (cont.)

[John Aitchison] [Mission Ops]


Effects of non 110km circ orbit cont1

Effects of Non 110km Circ Orbit (cont.)

[John Aitchison] [Mission Ops]


Descent eom s

Descent EOM’s

[John Aitchison] [Mission Ops]


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