Journal Article10.1007/S11071-007-9269-3
Deployment/retrieval optimization for flexible tethered satellite systems
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TL;DR: An efficient mathematical model for flexible tethered systems is derived, which treats the tether as composed of a system of lumped masses connected via inelastic links and it is shown that only a very small number of parameters are required to generate accurate trajectories.
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Abstract: A methodology for deployment/retrieval optimization of tethered satellite systems is presented. Previous research has focused on the case where the tether is modeled as an inelastic, straight rod for the determination of optimal system trajectories. However, the tether shape and string vibrations can often be very important, particularly when the deployment/retrieval speed changes rapidly, or when external forces such as aerodynamic drag or electrodynamic forces are present. An efficient mathematical model for flexible tethered systems is first derived, which treats the tether as composed of a system of lumped masses connected via inelastic links. A tension control law is presented based on a discretization of the tether length dynamics via Chebyshev polynomials. A scheme that minimizes the second derivative of length over the trajectory based on physically meaningful coefficients is presented. This is utilized in conjunction with evolutionary optimization methods to minimize the rigid body and flexible modes of the system during deployment/retrieval. It is shown that only a very small number of parameters are required to generate accurate trajectories. The results are compared to the case where the tether is modeled as a straight rod.
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Citations
A review of space tether in new applications
TL;DR: This review is conducted to provide an overall summary of the space tether for On-Orbit Servicing, and further the conversation regarding possible research interests in the future.
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Advances in dynamics and control of tethered satellite systems
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Dynamics of variable-length tethers with application to tethered satellite deployment
TL;DR: In this article, the dynamics of variable-length tethers using a flexible multibody dynamics method was studied using a new, hybrid Eulerian and Lagrangian framework, by which the mass flow at a boundary of a tether and the length variation of the tether element were accounted for.
79
Dynamic analysis of a tethered satellite system with a moving mass
TL;DR: In this paper, a two-piece dumbbell model for tethered satellite systems with a moving mass is presented, and the dynamic response of the system when the moving mass travels along the tether connecting the two satellites is computed and analyzed.
69
Discrete-Time Sliding Mode Control for Deployment of Tethered Space Robot With Only Length and Angle Measurement
Zhiqiang Ma,Panfeng Huang +1 more
TL;DR: A nonlinear discrete-time sliding mode based tension control for deployment of tethered space robot with only length and angle measurements and makes no appeal to velocity terms is proposed.
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