@InProceedings{Prado:2018:MuMaSp,
author = "Prado, Antonio Fernando Bertachini de Almeida",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Multi-tethered maneuvers for a spacecraft passing near the moon",
year = "2018",
organization = "International Astronautical Congress, 69.",
abstract = "The present paper has the goal of studying the problem of changing
the trajectory of a spacecraft passing close to the Moon using a
multi-tethered assisted maneuver. The idea is to deviate the
trajectory of a spacecraft coming to the Moon from an elliptical
orbit around the Earth. The literature approaches this problem
using several techniques, including impulsive, low thrust and
gravity assisted maneuvers. In the opposite side, the present
paper explores an idea that is already available in the
literature, and uses tethered-assisted maneuvers to change the
orbit of the spacecraft, without fuel consumption. The tethers are
assumed to be fixed in the surface of the Moon and they are used
to rotate a spacecraft that is passing nearby, generating a series
of tethered sling shot effects that changes the energy, velocity
and angular momentum of the spacecraft with respect to the Earth.
The new trajectory will have different values for the Keplerian
elements with respect to the Earth, which can benefit the mission.
The article focus in the energy gains obtained by the maneuver,
considering different values for the tether length, geometry of
approach, number of tethers, etc. It is also studied the tension
that is applied to the tether, such that it is possible to give an
idea of the requirements to build the tether. This study
investigates the use of multiple tethers in order to maximize the
gains of energy while minimizing tether length and tension, which
are two very important factors when building the tether. A
simplified mathematical model of the system is developed, assuming
an inextensible tether with no mass. To solve this problem,
analytical and numerical solutions are combined to obtain the
results, which are the energy variations and tension in the tether
as a function of the number of tethers and the size of each of
them. The main conclusion of the paper is that the proposed scheme
can give large variations of energy to the spacecraft without fuel
expenses, and that the use of several tethers can reduce the
individual size and tension of each tether. So, this study shows
an interesting possibility to maneuver a spacecraft in the future
and can be applied to a large variety of missions.",
conference-location = "Bremen",
conference-year = "01-05 oct.",
language = "pt",
targetfile = "IAC-18,jorge.pdf",
urlaccessdate = "11 maio 2024"
}