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Deployment Control of Spinning Space Webs
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, Vol. 32, no 1, 40-50 p.Article in journal (Refereed) Published
Abstract [en]

Space webs are lightweight cable nets deployable in space to serve as platforms for very large structures. Deployment and stabilization of large space webs by spin have gained interest because the rotational inertia forces are in the plane of rotation and the spin rate that determines the magnitude of the web tension can be chosen to meet the mission requirements. Nevertheless, a robust control method is required for a successful spin deployment. The control law used for the deployment of the Znamya-2 membrane reflector, for which a feedback-controlled torque is applied to the center hub, was applied here to a quadratic space web folded in arms coiled around the hub. To analyze the deployment, an analytical three-degree-of-freedom model and a fully three-dimensional finite element model were developed. The simulations indicate that it is favorable to deploy the web in just one step. It is also suggested that the simple analytical model can be used to determine important mission requirements such as the torque, power, and energy required for different deployment times.

Place, publisher, year, edition, pages
2009. Vol. 32, no 1, 40-50 p.
Keyword [en]
Aerospace vehicles; Control theory; Marine biology; Neural networks; Robust control; Spin dynamics; Three dimensional; Analytical models; Control laws; Deployment controls; Large spaces; Large structures; Light weight cables; Membrane reflectors; Mission requirements; One steps; Robust control methods; Rotational inertias; Spin rates; Three-dimensional finite element models; Web tensions
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-9646DOI: 10.2514/1.37468ISI: 000262494900003ScopusID: 2-s2.0-60349101978OAI: diva2:126804
QC 20100729. Uppdaterad från accepted till published (20100729).Available from: 2008-11-21 Created: 2008-11-21 Last updated: 2010-07-29Bibliographically 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.
Trita-MEK, ISSN 0348-467X ; 2008:10
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
urn:nbn:se:kth:diva-9574 (URN)
Public defence
2008-12-08, F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (English)
QC 20100729Available from: 2008-11-21 Created: 2008-11-17 Last updated: 2010-07-29Bibliographically approved

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