Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991fsa..works....n&link_type=abstract
In NASDA, Future Space Activities Workshop: Lunar Base Workshop 1991 21 p (SEE N92-33753 24-91)
Physics
Flight Optimization, Lunar Landing, Orbit Calculation, Orbital Mechanics, Soft Landing, Descent Trajectories, Equations Of Motion, Interplanetary Trajectories, Landing Simulation, Lunar Exploration, Lunar Landing Modules, Lunar Orbits, Lunar Probes, Pontryagin Principle
Scientific paper
The following subjects necessary for lunar soft landing orbit design are reviewed: (1) methods to solve minimum fuel consumption problems; (2) lunar soft landing orbit design based on the results of the fuel consumption problems; and (3) future problems. The answer to the minimum fuel consumption by Pontryagin's maximum principle are presented. Lunar soft landing orbit design using a spherical model are presented for four assumed cases. Powered descending time-altitude profile, transient angle-altitude profile, powered descending time-vertical speed profile, powered descending time-control angle profile, and powered descending time-speed profile in down-range direction are showed. The following has become clear: (1) when powered descent begins from an elliptical orbit, starting from the perigee point is advantageous if the speed increase necessary for landing is employed as the criteria; and (2) constant thrust acceleration level exists to minimize necessary speed increase.
Nagano Koutarou
Nakajima Ken
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