Research On Warship Concealment Based On Induced Magnetic Field

With the development of modern measurement technology and signal processing technology,the physical field signals existing around the steel structure ship seriously affect its vitality,such as magnetic field,electric field,sound field,hydraulic field and thermal field.In comparison,due to the strong anti-sweeping capabilities of magnetic fuze underwater weapons,magnetic mines,magnetic torpedoes and other weapons have been widely used in the military field.For surface ships,their magnetic field signals are used as the detonation source of underwater magnetic weapons,which poses a threat to ships;from the perspective of underwater target recognition,underwater magnetic field signals are one of the important means of detecting objects.The concealment of a ship’s magnetic field is an important indicator to measure its combat effectiveness and survivability.With the improvement of the performance of magnetic underwater weapons and detection equipment,the threat to ships has increased significantly.In order to effectively reduce the magnetic field signal around the ship,it is necessary to master the magnetic field distribution around the ship,explore the influencing factors and laws of the ship’s magnetic field,and lay the foundation for the ship’s magnetic stealth.Among them,the ship is magnetized by the geomagnetic field to form an induced magnetic field in its surrounding space,which becomes an important signal source for underwater target recognition.Therefore,the research on the concealment of ships based on the induced magnetic field is of great significance.This thesis is based on electromagnetics,using numerical simulation analysis methods,taking a simplified model of a US Navy destroyer as the research object,and conducting research on the concealment of ships based on induced magnetic fields.Analyzed the characteristics of the induced magnetic field of ships containing ferromagnetic equipment,and discussed the influence of factors such as the magnetic permeability of the equipment materials,the spatial location and quantity of the equipment,the magnetic permeability of the ship’s shell,and the thickness of the shell on the induced magnetic field of the ship.The characteristics of the ship’s induced magnetic field under the influence of ferromagnetic bulkheads are analyzed,and the effects of the ship’s transverse bulkhead,longitudinal bulkhead and deck platform under different magnetic permeability and thickness on the ship’s overall induced magnetic field are compared.Evaluation indicators,quantitative analysis of the influence of ferromagnetic equipment and bulkheads on the overall induced magnetic field of the ship.In this thesis,combined electromagnetic and magnetic field numerical simulation methods,the relevant influencing factors of the ship induced magnetic field characteristics are explored and quantitatively analyzed,which has certain reference significance for the design of ship magnetic stealth and ship degaussing design.