Vibration control for a high-Tc superconducting non-linear levitation system

K. Nagaya, M. Tsukagoshi, Y. Kosugi, M. Murakami

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


In the present paper the modelling and control of a high-Tc superconducting levitation system are discussed. First, the analytical expressions for obtaining the non-linear levitation force, given by the present author, are clarified; and then a vibration control method is presented in which feedback currents involving frequency weights are used. In the method, the square of the displacement in the 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 non-linear vibrations will be reduced. Numerical calculations have been carried out for some typical problems. To validate the present method, experimental tests have also been carried out.

Original languageEnglish
Pages (from-to)299-311
Number of pages13
JournalJournal of Sound and Vibration
Issue number2
Publication statusPublished - 1997 Nov 27
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering


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