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Improved method for demagnetisation of naval vessels and Preisach analysis

Improved method for demagnetisation of naval vessels and Preisach analysis. T. M. Baynes, G. J. Russell and A. Bailey University of New South Wales, Sydney Australia Maritime Operations Division D.S.T.O. Australia. Demagnetisation. (from Chikazumi 1967). Anhysteretic magnetisation. Z Coil.

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Improved method for demagnetisation of naval vessels and Preisach analysis

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  1. Improved method for demagnetisation of naval vessels and Preisach analysis T. M. Baynes, G. J. Russell and A. Bailey University of New South Wales, Sydney Australia Maritime Operations Division D.S.T.O. Australia

  2. Demagnetisation (from Chikazumi 1967) Anhysteretic magnetisation

  3. Z Coil X Coil

  4. Deperm on Submarine

  5. Problems with Flash D • Redundancy • Time consuming • Predicting deperm outcome

  6. Longitudinal magnetisation duringdeperm

  7. Anhysteretic deperm results

  8. Preisach Model

  9. DMR (H1 , H2 ) = f(-H1 ).f(H2 ) MR initial(H) =1/2 f(H) 2

  10. Stage 1 data approximation

  11. Conclusions: • laboratory simulation allows experiments into alternative deperm procedures. • Anhysteretic deperm produces more reliable vertical magnetisation AND allows for theoretical modelling. Flash D can not be modelled easily. • Preisach model used to describe bulk magnetisation changes in tube. • It’s possible to use just use the initial remanent magnetisation curve to predict deperm results. • Stage 1 data from previous deperms on submarines can be used as approximation for initial curve – can also predict deperm results.

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