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Optimal Deployment Control of Spinning Space Webs and Membranes
KTH, School of Engineering Sciences (SCI), Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0001-6802-8331
2009 (English)In: Journal of Guidance Control and Dynamics, ISSN 0731-5090, E-ISSN 1533-3884, Vol. 32, no 5, 1519-1530 p.Article in journal (Refereed) Published
Abstract [en]

Future solar sail and solar power satellite missions will consider using centrifugal forces for deployment and stabilization. Some of the main advantages with spin deployment are that the significant forces are in the plane of rotation, and a relatively simple control can be used and the tension in the membrane or web can be adjusted by the spin rate. Existing control strategies seem to either consume excessive energy or cause oscillations. In this study, control laws are derived from the solution to relevant optimal control problems and existing controls. The derived control laws are used in deployment simulations with both simple analytical three-degree-of-freedom models and a fully-three-dimensional finite element model. The results indicate that the derived control laws can be used to minimize the energy consumption and oscillations as for an optimal control, yet retain the simplicity of previous control laws.

Place, publisher, year, edition, pages
2009. Vol. 32, no 5, 1519-1530 p.
Keyword [en]
Centrifugal Forces; Control laws; Control strategies; Deployment simulation; Energy consumption; Excessive energy; Optimal control problem; Optimal controls; Optimal deployment; Solar power satellites; Solar sails; Spin rate; Three dimensional finite element model; Centrifugation; Optimization; Simulators; Solar energy; Solar equipment; Spin dynamics
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-9647DOI: 10.2514/1.42203ISI: 000269939800011Scopus ID: 2-s2.0-72149125839OAI: oai:DiVA.org:kth-9647DiVA: diva2:126805
Note
QC 20100729. Uppdaterad från submitted till published (20100729).Available from: 2008-11-21 Created: 2008-11-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Deployment Control of Spinning Space Webs and Membranes
Open this publication in new window or tab >>Deployment Control of Spinning Space Webs and Membranes
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Future solar sail and solar power satellite missions require deployment of large and lightweight flexible structures in space. One option is to spin the assembly and use the centrifugal force for deployment, stiffening and stabilization. Some of the main advantages with spin deployment are that the significant forces are in the plane of rotation, a relatively simple control can be used and the tension in the membrane or web can be adjusted by the spin rate to meet the mission requirements. However, a successful deployment requires careful development of new control schemes. The deployment rate can be controlled by a torque, applied either to a satellite in the center or by thrusters in the corners, or by deployment rate control, obtained by tether, spool braking or folding properties.

Analytical models with only three degrees of freedom were here used to model the deployment of webs and membranes for various folding patterns and control schemes, with focus on space webs folded in star-like arms coiled around a center hub. The model was used to investigate control requirements and folding patterns and to obtain optimal control laws for centrifugal deployment. New control laws were derived from the optimal control results and previously presented control strategies. Analytical and finite element simulations indicate that the here developed control laws yield less oscillations, and most likely more robustness, than existing controls.

Rotation-free (RF) shell elements can be used to model inflation or centrifugal deployment of flexible memebrane structures by the finite element method. RF elements approximate the rotational degrees of freedom from the out-of-plane displacements of a patch of elements, and thus avoid common singularity problems for very thin shells. The performance of RF shell elements on unstructured grids is investigated in the last article of this thesis, and it is shown that a combination of existing RF elements performs well even for unstructured grids.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. x, 64 p.
Series
Trita-MEK, ISSN 0348-467X ; 2008:10
Keyword
Flexible structures, space webs, membranes, solar sails, solar power systems, deployment control, optimal control, centrifugal force deployment, spin deployment, rotation-free, shell elements
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-9574 (URN)
Public defence
2008-12-08, F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100729Available from: 2008-11-21 Created: 2008-11-17 Last updated: 2010-07-29Bibliographically approved

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