1 / 3

Low Thrust Spiral Transfer Maneuvers and Analysis

February 5, 2009. Low Thrust Spiral Transfer Maneuvers and Analysis. 1. TLI and Lunar Capture Scenarios. Delta V breakdown for EP system Spiral transfer from 200 km Earth parking orbit to edge of moon’s sphere of influence (~66,000 km from moon – L1)

nuri
Télécharger la présentation

Low Thrust Spiral Transfer Maneuvers and Analysis

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. February 5, 2009 [Andrew Damon] [Mission Ops] Low Thrust Spiral Transfer Maneuvers and Analysis 1

  2. TLI and Lunar Capture Scenarios • Delta V breakdown for EP system • Spiral transfer from 200 km Earth parking orbit to edge of moon’s sphere of influence (~66,000 km from moon – L1) • ΔV1 = 6.70 km/s to L1 (Lagrange point 1) • Spiral Transfer from L1 to 110 km lunar orbit • ΔV2 = 0.50 km/s = 500 m/s • ΔVtot = 7.2 km/s • Compare to: ΔV2 for impulsive maneuver to put periapsis at 110 km lunar orbit, with apoapsis near L1 • ΔV2 = 1.10 km/s • ΔVtot = 7.8 km/s [Andrew Damon] [Mission Ops] 2

  3. Higher Precision Spiral Model [Andrew Damon] [Mission Ops] Based on: • Herman and Conway: “Optimal, Low-Thrust, Earth–Moon Orbit Transfer” • Constant thrust accelerations on the order of 10-4 g • Time of flights on the order of 30 days • Our thrust half of this value, at most • Time of flights on the order of 2+ months • Equations of motion based on modifedKeplerian elements • Perturbing accelerations accounted for, from Earth, Moon, s/c thrust • Will give more accurate trajectory and time of flight data 3

More Related