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

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

scholarly journals Deployment requirements for deorbiting electrodynamic tether technology

2021 ◽  
Author(s):  
Giulia Sarego ◽  
Lorenzo Olivieri ◽  
Andrea Valmorbida ◽  
Alice Brunello ◽  
Enrico C. Lorenzini ◽  
...  
Keyword(s):  
Lorentz Force ◽  
Electrodynamic Tether ◽  
Operational Life ◽  
Electrodynamic Tethers

AbstractIn the last decades, green deorbiting technologies have begun to be investigated and have raised a great interest in the space community. Among the others, electrodynamic tethers appear to be a promising option. By interacting with the surrounding ionosphere, electrodynamic tethers generate a drag Lorentz force to decrease the orbit altitude of the satellite, causing its re-entry in the atmosphere without using propellant. In this work, the requirements that drive the design of the deployment mechanism proposed for the H2020 Project E.T.PACK—Electrodynamic Tether Technology for Passive Consumable-less Deorbit Kit—are presented and discussed. Additionally, this work presents the synthesis of the reference profiles used by the motor of the deployer to make the tethered system reach the desired final conditions. The result is a strategy for deploying electrodynamic tape-shaped tethers used for deorbiting satellites at the end of their operational life.

Experimental evaluation of time-varying impulse shaping with a two-link flexible manipulator

Robotica ◽  
1996 ◽  
Vol 14 (3) ◽  
pp. 339-345 ◽  
Author(s):  
Jung-Keun Cho ◽  
Youn-Sik Park
Keyword(s):  
Vibration Reduction ◽  
Vertical Plane ◽  
Joint Stiffness ◽  
Flexible Manipulator ◽  
Input Shaping ◽  
Time Varying ◽  
Modal Properties ◽  
Revolute Joints ◽  
Point Motion ◽  
Point To Point

SUMMARYIn the authors' previous paper,10 an input shaping method was presented to reduce motion-induced vibrations effectively for various classes of flexible systems. In this paper, the effectiveness of the shaping method is experimentally demonstrated with a two-link flexible manipulator systemThe manipulator for experiments includes two revolute joints and two flexible links, and moves on a vertical plane under gravity. An analytic model is developed considering the flexibility of the system and its joint stiffness in order to derive an appropriate estimation of dynamic modal properties. The input shaping method used in this work utilizes time-varying modal properties obtained from the model instead of the conventional input shaping method which employs time-invariant modal properties. A point-to-point motion is tested in order to show the effectivess of the proposed shaping method in vibration reduction during and after a given motion. The given reference trajectories are shaped to suppress the motion induced vibration. The test results demonstrate that the link vibration can be greatly suppressed during and after a motion, and the residual vibration reduction was observed more than 90% by employing this time-varying impulse shaping technique.

scholarly journals The TSS-1R electrodynamic tether experiment: Scientific and technological results

1999 ◽  
Vol 24 (8) ◽  
pp. 1037-1045 ◽  
Author(s):  
N.H. Stone ◽  
W.J. Raitt ◽  
K.H. Wright
Keyword(s):  
Electrodynamic Tether
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