000007684 001__ 7684
000007684 005__ 20240531164756.0
000007684 02470 $$2doi$$a10.24868/issn.2515-818X.2020.043
000007684 035__ $$a4497837
000007684 037__ $$aGENERAL
000007684 245__ $$aImportance of modelling equipment details and ship motions for magnetic signature predictions
000007684 269__ $$a2020-10-05
000007684 336__ $$aConference Proceedings
000007684 520__ $$aInvestigation of magnetic signatures produced by ships in Earth’s magnetic field plays an important role in naval ship design and these signatures need to be kept below safe levels. If the magnetic signature is predicted accurately, then the threat of detection of the ship by sea mines can be avoided by the design of degaussing coils to cancel the magnetic signature. The main source of static magnetic (SM) signature is the ferromagnetic material used for the vessel construction. The vessel could be subjected to severe rolling and pitching motions, depending upon the weather conditions. As a result, eddy currents are generated in the vicinity of the vessel (electrically conducting material) due to such motions, affecting the magnetic signature considerably. In the present work SM signature and the effect of eddy current on SM signature is investigated for a naval vessel. FE based computational electromagnetic methodology is followed for magnetic signature prediction. In the initial design stage details of critical equipment having considerable ferromagnetic material, e.g. mai engine (ME) are normally not available. Thus the effect of modelling such equipment on SM is investigatedwith suitable approximations. The study emphasizes the importance of accurate modelling of internal ship structure and the critical equipment. Considering the contribution of deck plating, bulkheads, the orientation and location of certain equipment significantly alters the magnetic signature. A detailed investigation is carried out towards most appropriate prediction of such signature. Vessel is considered fixed for the simulation purpose. Thus in order to simulate eddy currents, earth’s magnetic field is varied in accordance with already computed vessel motion. The signature thus computed can be considered for preliminary design of degaussing coils.
000007684 542__ $$fCC-BY-4.0
000007684 6531_ $$aStatic Magnetic Signature
000007684 6531_ $$aEarth' Magnetic Field
000007684 6531_ $$aDipole
000007684 6531_ $$aFEA
000007684 7001_ $$aJoga, RK$$uIRCLASS, MUMBAI, INDIA
000007684 7001_ $$aChaturvedi, A$$uIRCLASS, MUMBAI, INDIA
000007684 7001_ $$aDhavalikar, S$$uIRCLASS, MUMBAI, INDIA
000007684 7001_ $$aGirish, N$$uIRCLASS, MUMBAI, INDIA
000007684 773__ $$tConference Proceedings of INEC
000007684 773__ $$jINEC 2020
000007684 789__ $$whttps://zenodo.org/record/4497837$$2URL$$eIsIdenticalTo
000007684 85641 $$uhttps://www.imarest.org/events/inec-2020$$yConference website
000007684 8564_ $$94d588f1a-393a-4a62-94e5-bf483ce42d7b$$s3189596$$uhttps://library.imarest.org/record/7684/files/INEC_2020_Paper_67.pdf