The University of Southampton
University of Southampton Institutional Repository

Lunar soft landing trajectory optimization in a 6DoF dynamical model

Lunar soft landing trajectory optimization in a 6DoF dynamical model
Lunar soft landing trajectory optimization in a 6DoF dynamical model
An algorithm for the optimization of a lunar soft-landing trajectory is presented. A 6DOF modeling of the dynamics is adopted together with an accurate description of the Moon gravity field.
The problem is faced as a direct optimization problem with the goal of obtaining a vertical landing whilst minimizing the overall fuel consumption. The descent trajectory is supposed to start from the periselenium of a low Moon orbit. Four optimization phases are considered. Each phase is characterized by a different set of optimization variables, constraints, and increasing level of complexity. In the first phase the thrust direction is optimized considering the translational motion of the lander only. Furthermore, no throttle capability is considered. In the second phase the thrust direction is fixed in the spacecraft body reference frame. The proper thrust orientation is obtained by optimizing the control torques supplied to the lander by the attitude sub-system. In the third phase the thrust magnitude is optimized too, and the constraint of landing on specific site is added. Furthermore, more restrictive constraints on the final velocities (linear and angular) are set. Finally, in the fourth phase a more accurate gravitational model of Moon that includes the main harmonics is considered.
The algorithm is tested on two different landing scenarios. One considers a landing in an area close to the Moon's equator, and it is inspired by Google Lunar X-prize. The second one describes a landing near the north pole area for a mission whose goal is to visit the craters where recently the presence of water has been discovered
9781618398055
5308-5318
International Astronautical Federation
Abadi Farahani, Dario Dowlat
1d490fde-b686-4b76-8871-27fc8b4051af
Armellin, Roberto
61950d5c-3dcf-45f5-b391-7e8c6ffb8e6f
Lavagna, Michèle
f20bb48e-35e1-4e54-bc43-59c18ba37a14
Abadi Farahani, Dario Dowlat
1d490fde-b686-4b76-8871-27fc8b4051af
Armellin, Roberto
61950d5c-3dcf-45f5-b391-7e8c6ffb8e6f
Lavagna, Michèle
f20bb48e-35e1-4e54-bc43-59c18ba37a14

Abadi Farahani, Dario Dowlat, Armellin, Roberto and Lavagna, Michèle (2011) Lunar soft landing trajectory optimization in a 6DoF dynamical model. In Proceedings of the 62nd International Astronautical Congress. International Astronautical Federation. pp. 5308-5318 .

Record type: Conference or Workshop Item (Paper)

Abstract

An algorithm for the optimization of a lunar soft-landing trajectory is presented. A 6DOF modeling of the dynamics is adopted together with an accurate description of the Moon gravity field.
The problem is faced as a direct optimization problem with the goal of obtaining a vertical landing whilst minimizing the overall fuel consumption. The descent trajectory is supposed to start from the periselenium of a low Moon orbit. Four optimization phases are considered. Each phase is characterized by a different set of optimization variables, constraints, and increasing level of complexity. In the first phase the thrust direction is optimized considering the translational motion of the lander only. Furthermore, no throttle capability is considered. In the second phase the thrust direction is fixed in the spacecraft body reference frame. The proper thrust orientation is obtained by optimizing the control torques supplied to the lander by the attitude sub-system. In the third phase the thrust magnitude is optimized too, and the constraint of landing on specific site is added. Furthermore, more restrictive constraints on the final velocities (linear and angular) are set. Finally, in the fourth phase a more accurate gravitational model of Moon that includes the main harmonics is considered.
The algorithm is tested on two different landing scenarios. One considers a landing in an area close to the Moon's equator, and it is inspired by Google Lunar X-prize. The second one describes a landing near the north pole area for a mission whose goal is to visit the craters where recently the presence of water has been discovered

Full text not available from this repository.

More information

Published date: October 2011
Venue - Dates: 62nd International Astronautical Congress, South Africa, 2011-10-03 - 2011-10-07
Organisations: Aeronautics, Astronautics & Comp. Eng

Identifiers

Local EPrints ID: 360579
URI: https://eprints.soton.ac.uk/id/eprint/360579
ISBN: 9781618398055
PURE UUID: 986bce8e-bed4-419f-80b5-594522da7f77

Catalogue record

Date deposited: 13 Dec 2013 16:50
Last modified: 03 Dec 2018 17:33

Export record

Contributors

Author: Dario Dowlat Abadi Farahani
Author: Michèle Lavagna

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×