Improved Methods for Magnetic Silencing in Ships and Submarines.

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Improved Methods for Magnetic Silencing in Ships
and Submarines.
Tim Baynes
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Z Coil
X Coil
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Demagnetisation
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• THE PROBLEM
• Redundancy
• Time consuming
• Predicting deperm outcome

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Anhysteretic magnetisation
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Theory and Experimental Results for Laboratory
Anhysteretic Deperms
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Longitudinal magnetisation during deperm
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Deperm Results
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Preisach Model
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Summary

• Laboratory simulation has allowed experiments
  into alternative deperm procedures.
• Anhysteretic deperm was QUICKER more RELIABLE
  allows for theoretical modelling.
• Theoretical models have been used to describe
  magnetisation changes in models and real vessels.
• BOTTOM LINE NEW DEPERM IS QUICKER, MORE RELIABLE
  and MORE PREDICTABLE
• More information at www.phys.unsw.edu.au/tmb/dow
  nloads.htm

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