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Mutual Effects between Earth's Magnetic Field and Marine Vehicles and their Modeling & Demagnetization

Zareei, Abdulkhaled | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43207 (08)
  4. Department: Mechanical Engineering
  5. Advisor(s): Sayyaadi, Hassan; Mehdigholi, Hamid
  6. Abstract:
  7. In the construction of naval vessels and some merchant ships, stealth to avoid detection is an important design feature. With recent advances in electromagnetic sensor technology, the war time threat to shipping posed by electromagnetically triggered mines is becoming more significant and consequently the need to understand, predict and reduce the electromagnetic signature of ships is growing.
    The objective of this theoretical-practical work is to derive solutions to static ferromagnetic problems that include current-carrying coils, uniform inducing fields, and linear and homogeneous ferromagnetic bodies. The solutions obtained with the open source FEMM 4.2 software, is validated by theoretical formulae. The work presented in this study is concerned with the magnetic signature resulting from the magnetization of the ferromagnetic material of a marine vehicle. The detection threat arising from this induced magnetic signature has been known for many years, and consequently, ships are generally fitted with degaussing coils. within this work, the computational models are used to identify the magnetic components and the influence of coils. The first model considered, is a spherical object with defined magnetic permeability. For this model, mathematical relations have been derived and used in preliminary design studies. The second is a prolate spheroidal object which is much more suitable to resemble a real ship. Maxwell's equations are extracted. For clarity, the equations governing on electromagnetism, earth's magnetic field, and different types of demagnetization are also stated. In this thesis, after stating first order ferromagnetic models, an investigation through swarm of marine vehicles has been stated which one can simulate them with the higher orders of these models later. Further studies for this thesis as stated are the swarm of marine vehicles while demagnetizing their magnetic fields with their special configurations. For this purpose, Neural Networks, Genetic Algorithm and other familiar methods can be used for further studies in the future
  8. Keywords:
  9. Geomagnetic Field ; Marine Vehicle ; Ferromagnetic Model

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