Comparative Study on COMSOL Finite Element Modeling Method of Ship Magnetic Field Based on Scalar Magnetic Potential and Vector Magnetic Potential

Wang, Kaisong; Zhou, Guohua; Liu, Yuelin

doi:10.1007/978-981-33-6609-1_42

Cited by 3 publications

(4 citation statements)

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“…where B1 and B2 are the internal and external magnetic flux densities, respectively, ∇T is the tangential gradient operator, n is the normal vector, ds is the hull thickness of the vessel, and HbT is the background tangential field intensity vector [12], [14], [17], [19], [20].…”

Section: The Thin Shell Problemmentioning

confidence: 99%

“…For an average vessel draft of 5 m, the observation depth was selected as close as possible to the vessel's beam which is the standard measuring depth [19].…”

Section: E Scaling Effectmentioning

confidence: 99%

“…Necessary approximations must be performed using FEM software in a numerical solution. The accuracy of the COMSOL Multiphysics software has been discussed by Wang et al [19], which has already alleviated the thin sheet boundary problem by adding the magnetic shielding condition along with the magnetic insulation boundary condition and the utilization of the reduced field formulation; thus, software approximations are inevitable. Hence, differences may not be prominent when it comes to underwater protruding details such as the propeller shaft or rudder in the numerical solution at the selected depth.…”

Section: ) Numerical Signaturesmentioning

confidence: 99%

“…A major parameter that predominantly affects signature component peak values is the observation depth. During the study, the observation depth for numerical modeling was 15 m, which was selected as close as possible to the standard depth for signature measurement [19].…”

Section: ) Numerical Signaturesmentioning

confidence: 99%

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Analyzing the Effect of Flux Intensification Due to Propeller Shaft and Rudder Upon the 3D Induced Magnetic Signature of Marine Vessels

2022

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This study investigates and analyzes the effect of flux intensification due to the propeller shaft and rudder on the 3D mapped induced magnetic signature of marine vessels. The study was designed to extrapolate the 3D induced magnetic signature and to analyze the difference between signature components in two different cases: a vessel without propeller shaft or rudder and a vessel with the propeller shaft and rudder attached. Numerical modeling was conducted using full-scale vessel dimensions and finiteelement analysis (FEA) modeling software. Measurements on a 1:100 properly scaled and designed physical scale model (PSM) were conducted in a magnetically clean area. To enrich the analysis, both signature components from the numerical evaluation and experimental measurements were 3D mapped. Both the scaling technique and scaling effect on magnetic signature were investigated. The signature measurements of the scaled vessel model were performed to verify the numerical model. Both the numerical and experimental results are both discussed and shown to be consistent. The extrapolated signature components revealed that the studied effect became prominent as the saliency of the 3D mapped signature components increased. Consequently, this effect increases the magnetic susceptibility of the vessel to detection or destruction. Finally, this study suggests solutions to reduce this effect.

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Section: The Thin Shell Problemmentioning

confidence: 99%

“…For an average vessel draft of 5 m, the observation depth was selected as close as possible to the vessel's beam which is the standard measuring depth [19].…”

Section: E Scaling Effectmentioning

confidence: 99%

Section: ) Numerical Signaturesmentioning

confidence: 99%

Section: ) Numerical Signaturesmentioning

confidence: 99%

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