Nonlinear Vibration Control for a High-Tc Superconducting Levitation System

Kosuke Nagaya, Masato Tsukagoshi, Yasuhiro Kosugi, Masato Murakami

Research output: Contribution to journalArticlepeer-review


The present article discusses a modeling and control of high–Tc superconducting levitation system. The paper first clarifies analytical expressions for obtaining nonlinear levitation force given by the present author, then presents a vibration control method in which feedback currents involving frequency weights. In the method, an addition of a square of the displacement and currents in a frequency domain is taken as a cost function. Optimal coefficients of the transfer function of the controller are obtained by minimizing the cost function. Hence, the spillover instability due to the nonlinear vibration will be reduced. Numerical calculations have been carried out for some typical problems. To validate the present method, experimental tests also have been carried out.

Original languageEnglish
Pages (from-to)2520-2527
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number623
Publication statusPublished - 1998
Externally publishedYes


  • High Tc superconductor
  • Levitation
  • Modeling
  • Nonlinear Spring
  • Optimal Control Nonlinear Vibration
  • Vibration Control

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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