An Application of Input Shaping for Electrodynamic Tether System

Watanabe, Takeo; Makida, Takeshi; Fujii, Hironori; Kojima, Hirohisa; Singhose, William

doi:10.2514/6.2004-5313

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…Robust shaping was also applied to the problem of momentum dumping of spacecraft reaction wheels (Banerjee et al, 2001). Watanabe et al (2004) applied input shaping to electrodynamic tether operations. Two cases of satellite deorbit and one case of International Space Station reboost were considered in the investigation.…”

Section: Applications Of Input Shapingmentioning

confidence: 99%

Command Shaping for Nonlinear Crane Dynamics

Blackburn

Singhose

Kitchen

et al. 2009

Journal of Vibration and Control

120

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Motion-induced vibration can be greatly reduced by properly shaping the reference command. Input shaping is one type of reference shaping method that is based largely on linear superposition. In this paper we document the impact of nonlinear crane dynamics on the effectiveness of input shaping. As typical bridge cranes are driven using Cartesian motions, they behave nearly linearly for low- and moderate-velocity motions. On the other hand, the natural rotational motions of tower cranes make them more nonlinear. The nonlinear equations of motion for both bridge and tower cranes are presented and experimentally verified using two portable cranes. The effectiveness of input shaping on the near-linear bridge crane is explained. Then, a command-shaping algorithm is developed to improve vibration reduction during the more nonlinear slewing motions of the tower crane. Experimental results demonstrate the effectiveness of the proposed approach over a wide range of operating conditions.

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Section: Applications Of Input Shapingmentioning

confidence: 99%

Command Shaping for Nonlinear Crane Dynamics

Blackburn

Singhose

Kitchen

et al. 2009

Journal of Vibration and Control

120

View full text Add to dashboard Cite

show abstract

“…Similar to the non-electrodynamic tether systems, electrodynamic tether (EDT) systems have also been studied as actuators to control the librational motion. Watanabe et al [15] studied an application of the input shaping technique to the librations and vibrations of a flexible electrodynamic tethered satellite in the case of reboosting. Williams et al [16] proposed a librational control for a flexible tether using electromagnetic force and a movable attachment.…”

Section: Introductionmentioning

confidence: 99%