How to recognize superconducting rotor sound by AE

H. Nomura, K. Kaiho, I. Ishii, N. Higuchi, H. Tateishi, S. Fuchino, Kazuhiro Kajikawa, S. Sekine, K. Arai, N. Natori, N. Tamada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

New evaluating methods for rotating superconducting magnets have been developed by observing acoustic emission (AE) from the rotating machine. First, by measuring the AE level, we can learn whether the conductor is changing from a super to a normal state or not. Secondly, we can get to the area of the magnet the normal state was propagated in by comparing the AE signals level of each channel. Thirdly, we can estimate how large a quenched magnetic energy to dissipated in the magnet by measuring the recovery of time constant of the AE signals. Fourthly, we can detect the difference between the AE just before and after the jumps of heat flux by analysing the AE spectrum. Finally, we report how we can predict from what areas the incoming natural quench of the magnet will be initiated, by monitoring the AE level of each channel.

Original languageEnglish
Pages (from-to)307-309
Number of pages3
JournalUltrasonics
Volume34
Issue number2-5
DOIs
Publication statusPublished - Jan 1 1996
Externally publishedYes

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acoustic emission
rotors
acoustics
magnets
superconducting magnets
time constant
heat flux
emission spectra
conductors
recovery
estimates

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

Nomura, H., Kaiho, K., Ishii, I., Higuchi, N., Tateishi, H., Fuchino, S., ... Tamada, N. (1996). How to recognize superconducting rotor sound by AE. Ultrasonics, 34(2-5), 307-309. https://doi.org/10.1016/0041-624X(96)00022-4

How to recognize superconducting rotor sound by AE. / Nomura, H.; Kaiho, K.; Ishii, I.; Higuchi, N.; Tateishi, H.; Fuchino, S.; Kajikawa, Kazuhiro; Sekine, S.; Arai, K.; Natori, N.; Tamada, N.

In: Ultrasonics, Vol. 34, No. 2-5, 01.01.1996, p. 307-309.

Research output: Contribution to journalArticle

Nomura, H, Kaiho, K, Ishii, I, Higuchi, N, Tateishi, H, Fuchino, S, Kajikawa, K, Sekine, S, Arai, K, Natori, N & Tamada, N 1996, 'How to recognize superconducting rotor sound by AE', Ultrasonics, vol. 34, no. 2-5, pp. 307-309. https://doi.org/10.1016/0041-624X(96)00022-4
Nomura H, Kaiho K, Ishii I, Higuchi N, Tateishi H, Fuchino S et al. How to recognize superconducting rotor sound by AE. Ultrasonics. 1996 Jan 1;34(2-5):307-309. https://doi.org/10.1016/0041-624X(96)00022-4
Nomura, H. ; Kaiho, K. ; Ishii, I. ; Higuchi, N. ; Tateishi, H. ; Fuchino, S. ; Kajikawa, Kazuhiro ; Sekine, S. ; Arai, K. ; Natori, N. ; Tamada, N. / How to recognize superconducting rotor sound by AE. In: Ultrasonics. 1996 ; Vol. 34, No. 2-5. pp. 307-309.
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