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Robust Control For Active Debris Removal of a Large Flexible Space Structure

Singh, Sunayna and Mooij, Erwin (2020) Robust Control For Active Debris Removal of a Large Flexible Space Structure. In: AIAA Scitech 2020 Forum. AIAA Guidance, Navigation and Control Conference, 6-10 January, Orlando, Florida. doi: 10.2514/6.2020-2077. ISBN 978-162410595-1. ISSN 2020-2077.

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Official URL: https://arc.aiaa.org/doi/10.2514/6.2020-2077


This paper examines the dynamics and control involved in the active removal of a large space debris - Envisat. In the light of European Space Agaency's e.deorbit mission, the current mission scenario consists of a chaser satellite, synchronising, capturing and detumbling the large uncooperative debris. A unique multibody approach based on floating frames is used to model the Flexible Multibody Dynamics. The controllability characteristics of a linear PD controller and an Incremental Nonlinear Dynamic Inversion controller are also studied. From previous research, it was found that in the docked configuration, the control of the system could not be achieved due to the complex elastic dynamics originating from the large solar panel of Envisat (14.2~m). This paper focuses on achieving robust control of this phase through advanced design choices in both structural and control aspects. It was found that the inclusion of structural damping and reduction of control limits, lead to a major improvement in controllability of the system. A basic digital notch filter did not prove effective for more robust control. This is because only a high order filter could account for the low frequency vibrations. Further, it also required retuning of the controller within the flexible model. These two aspects proved to be beyond computational capabilities. A simple control strategy of introducing a dead-band in control loop improved the control response considerably by allowing the disturbing frequencies to dampen out.

Item URL in elib:https://elib.dlr.de/143850/
Document Type:Conference or Workshop Item (Lecture)
Title:Robust Control For Active Debris Removal of a Large Flexible Space Structure
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Singh, SunaynaUNSPECIFIEDhttps://orcid.org/0000-0002-9185-0267UNSPECIFIED
Date:January 2020
Journal or Publication Title:AIAA Scitech 2020 Forum
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Space debris, controls of flexible structures, flexible dynamics, multibody system, active debris removal
Event Title:AIAA Guidance, Navigation and Control Conference
Event Location:Orlando, Florida
Event Type:international Conference
Event Dates:6-10 January
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Systems Analysis Space Transport (SART)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Space Launcher Systems Analysis
Deposited By: Singh, Sunayna
Deposited On:09 Sep 2021 11:33
Last Modified:09 Jan 2023 11:47

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