scholarly journals Design of Electric Current Profile for Electrodynamic Tether Systems by Input Shaping Method

2005 ◽  
Vol 53 (623) ◽  
pp. 569-576
Author(s):  
Takeo Watanabe ◽  
HironoriA. Fujii ◽  
Hirohisa Kojima ◽  
William Singhose
Keyword(s):  
Electric Current ◽  
Input Shaping ◽  
Current Profile ◽  
Electrodynamic Tether

An Application of Input Shaping for Electrodynamic Tether System

2004 ◽  
Author(s):  
Takeo Watanabe ◽  
Takeshi Makida ◽  
Hironori Fujii ◽  
Hirohisa Kojima ◽  
William Singhose
Keyword(s):  
Input Shaping ◽  
Electrodynamic Tether

Variation of the Current Profile in a Solar Flare

1990 ◽  
Vol 8 (3) ◽  
pp. 289-291
Author(s):  
J. I. Khan
Keyword(s):  
Solar Flare ◽  
Electric Current ◽  
Energy Release ◽  
Magnetic Energy ◽  
Current Profile ◽  
Profile Changes

AbstractVariation of the electric current profile as a means of energy release in a solar flare is investigated. In particular, the change in magnetic energy is calculated for some simple idealized cases of the current profile. It is suggested that current profile changes may explain the smallest observed energy release structures in a flare.

Model Predictive Control for Electrodynamic Tether Geometric Profile in Orbital Maneuvering with Finite Element State Estimator

2021 ◽  
Author(s):  
Gangqiang Li ◽  
Zheng H. Zhu
Keyword(s):  
Finite Element ◽  
Model Predictive Control ◽  
Electric Current ◽  
Predictive Control ◽  
Control Method ◽  
High Fidelity ◽  
Reference Trajectory ◽  
Control Input ◽  
State Estimator ◽  
Electrodynamic Tether

Abstract This paper studies the control of geometric profile of a librating electrodynamic tether by model predictive control using the induced electric current in tether only. First, a high-fidelity multiphysics model of an electrodynamic tether system is built based on the nodal position finite element method and the orbital-motion-limited theory. Second, a state estimator is proposed to estimate the geometric profile of a librating electrodynamic tether, where only the positions and velocities at the tether ends are measurable. The non-measurable geometric profile of tether between two ends is estimated by the high-fidelity multiphysics model with the input of the measurement at tether ends in the spatial domain. To avoid the singularity or ambiguity in the estimation, the geometric profile of tether is then propagated in the time domain by the extended Kalman filter. Third, the problem of controlling the geometric profile of a librating electrodynamic tether is converted into a trajectory tracking problem of the underactuated electrodynamic tether system, where the induced electric current in the tether is the only control input. The control input is optimized by the model predictive control method subject to the output and input control constraints. The numerical simulation results show that the proposed approach is capable of effectively controlling the shape of the liberating electrodynamic tether to the reference trajectory.

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