Active Control for MXER Tether Rendezvous Maneuvers

Westerhoff, John H.

doi:10.2514/6.2003-5218

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…Control of the system for rendezvous when the tether system is spinning is much more difficult. Westerhoff (2003a) discussed a linear control strategy to minimize errors in rendezvous for a spinning momentum-exchange system using tether reeling and electromagnetic forces assuming that the tether is positioned reasonably close to the desired rendezvous position. It was assumed that errors in the out-of-plane direction can be handled by thrusters on the payload.…”

Section: Review Of Literature On Tether Transportationmentioning

confidence: 99%

Dynamics and Control of Spinning Tethers for Rendezvous in Elliptic Orbits

Williams¹

2006

Journal of Vibration and Control

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The dynamics and control of spinning tethers in elliptical orbits for payload rendezvous is studied. The required rendezvous conditions for the tether tip are derived for the case where the tether system center of mass and payload are in coplanar elliptic orbits. It is proposed that rendezvous control can be achieved by tracking the unique tip trajectory generated by propagating the rendezvous conditions backwards in time. The range of suitable combinations of tether system orbit eccentricity, tether length, and payload orbit eccentricity are studied numerically. It is shown that certain combinations of parameters lead to non-spinning capture requirements and slack tethers. Control of the tether motion through tether reeling is examined using a nonlinear model predictive control strategy. Numerical results illustrating the effectiveness of the controller are presented.

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Section: Review Of Literature On Tether Transportationmentioning

confidence: 99%

Dynamics and Control of Spinning Tethers for Rendezvous in Elliptic Orbits

Williams¹

2006

Journal of Vibration and Control

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“…Williams studied the capture of non-cooperative payloads that are in inclined orbits relative to the tether system, requiring that capture take place out-ofplane with respect to the tether system orbit [4][5]. Westerhoff discussed a linear control strategy to minimize errors in rendezvous for a spinning momentum-exchange system assuming that the tether is positioned reasonably close to the desired rendezvous position [6].…”

Section: Introductionmentioning

confidence: 99%

Coordinated approach control method of tethered space robot system

Meng

Huang

2013

2013 IEEE 8th Conference on Industrial Electronics and Applications (ICIEA)

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The tethered space robot system (TSR) will play a significant role in future on-orbit capture. In this paper, the approach model is derived and the coordinated approach control method is studied which contains an optimal open-loop controller and a feedback controller. The optimal open-loop control law is designed by Gauss pseudospectral method. Then, the approach model is linearized along the open-loop trajectory and the feedback controller is designed by linear quadratic regulator which is simpler and more efficient than the popular recedinghorizon controller. The simulation results show that the approach control method is effective, even in the presence of initial perturbations, the tracking errors of tether tension and other disturbances. Keywords-tethered space robot system(TSR); approach modeling; coordinated control;I. 978-1-4673-6322-8/13/$31.00 c 2013 IEEE

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“…[12] Westerhoff discussed a linear control strategy to minimize errors in rendezvous for a spinning momentum-exchange system, which assumed that the tether is reasonably close to the desired rendezvous position. [13] Williams studied payload capture problems and examined the influence of thermomechanical and tether flexibility effects. [14][15][16][17] However, most of the previous studies have focused on the dynamic and control problem of a long-tether system which is known as the tethered space satellite system (TSS).…”

Section: Introductionmentioning

confidence: 99%

An Effective Approach Control Scheme for the Tethered Space Robot System

Meng

Huang

2014

International Journal of Advanced Robotic Systems

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The tethered space robot system (TSR), which is composed of a platform, a gripper and a space tether, has great potential in future space missions. Given the relative motion among the platform, tether, gripper and the target, an integrated approach model is derived. Then, a novel coordinated approach control scheme is presented, in which the tether tension, thrusters and the reaction wheel are all utilized. It contains the open-loop trajectory optimization, the feedback trajectory control and attitude control. The numerical simulation results show that the rendezvous between TSR and the target can be realized by the proposed coordinated control scheme, and the propellant consumption is efficiently reduced. Moreover, the control scheme performs well in the presence of the initial state's perturbations, actuator characteristics and sensor errors.

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Active Control for MXER Tether Rendezvous Maneuvers

Cited by 7 publications

References 1 publication

Dynamics and Control of Spinning Tethers for Rendezvous in Elliptic Orbits

Dynamics and Control of Spinning Tethers for Rendezvous in Elliptic Orbits

Coordinated approach control method of tethered space robot system

An Effective Approach Control Scheme for the Tethered Space Robot System

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