Abstract
Magnetic silence of warships is necessary to prevent damage caused by the magnetic mines detecting the magnetic field of the warship. Anhysteretic and Deperm-ME protocols are used to reduce permanent magnetization among magnetic signals. However, they have some disadvantages. Therefore, this paper proposes an effective deperming protocol that is easily controlled and reduces the demagnetization time. A protocol composed of two Anhysteretic protocols is presented using the Preisach model to easily manage and ensure excellent performance. Each stage has its own advantages by considering the Preisach density distribution. In Stage 1, the existing magnetic history is erased, and the demagnetization time is reduced. In Stage 2, the demagnetization performance is improved. The effectiveness of the protocol was verified via simulations using the Preisach model and experiments using a specimen. When the proposed protocol was applied, the results were excellent when applying Anhysteretic and Deperm-ME. In addition, even if the number of magnetic fields was reduced by 4 and 8 in the proposed protocol, the demagnetization result was maintained. Therefore, if the proposed protocol is applied, excellent demagnetization results can be obtained and the time required to perform demagnetization can be reduced, thereby improving the operational capability of the warship.
Highlights
The magnetic signals of the warship consist of the induced magnetic field caused by the earth’s magnetic field during operation [1,2,3], eddy currents by rolling [4], and the permanent magnetization generated during the manufacturing process
This paper proposes an effective deperming protocol that is easy to control and can reduce the demagnetization time by using the Preisach model
Since these traces do not affect the result of demagnetization, the number of magnetic fields can be reduced
Summary
The magnetic signals of the warship consist of the induced magnetic field caused by the earth’s magnetic field during operation [1,2,3], eddy currents by rolling [4], and the permanent magnetization generated during the manufacturing process. Most of the signals are the induced and the permanent magnetic fields. Demagnetization is performed for magnetic treatment of the warship, and the induced magnetization is removed through the degaussing. A coil was wound around the warship to reduce permanent magnetization, as shown, and the demagnetization was performed by applying continuously alternating and decreasing magnetic fields. These magnetic fields are called the deperming protocol. As the magnetic sensor installed outside the ship can measure the induced magnetic field, it can be eliminated by applying a canceling current to the coil installed inside the ship [2,3]. Tization is more compensated by the degaussing coils with less power required
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