Efficient Flash-D Deperming Protocol for Magnetic Stealth of Submarine Using the Preisach Model

Demagnetization is required to prevent a warship from being detected by magnetic mines. However, minimal research has been conducted to establish a suitable deperming protocol, especially the Flash-D protocol. To establish such a deperming protocol, we conducted a theoretical study using Preisach modeling for the Flash-D protocol. Magnetic coercivity distributions were derived from B–H curves representing the material properties of the warship, and a deperming protocol that is effective on particles was proposed. The internal magnetization distribution was analyzed using the program combined with Preisach model and the finite element method (FEM), in accordance with the conventional and proposed protocols, and the proposed method was confirmed to be effective. In addition, the method was verified through experiments in a scaled-down magnetic treatment facility test room. Therefore, the proposed method can be used to establish an effective Flash-D protocol for submarines depending on the hysteresis characteristics of the magnetic material of the warship.