Method for obtaining initial magnetic permeability of steel plate for ship magnetic calculation

Abstract

The application discloses a kind of acquisition methods for the initial permeability of steel plate for ship magnetic calculation, comprising, the steel plate to be measured is discretized into N small hexahedral units, in the plane perpendicular to the motion direction of the steel plate to be measured, with the geometric center of the steel plate to be measured as the symmetric center, symmetrically arrange k sensors, obtain the vertical component of the magnetic field intensity generated by the horizontal component magnetization of the steel plate to be measured under geomagnetic field;Establish a permeability solving model, based on the permeability solving model, calculate the magnetic field intensity of the target measurement position by area integration: construct error objective function by the vertical component of the magnetic field intensity and the vertical component of the magnetic field intensity, minimize the objective function of error objective function by particle swarm algorithm, select the vertical component of the magnetic field intensity with the minimum error of the vertical component of the magnetic field intensity, obtain magnetic susceptibility;According to the initial magnetization calculated by magnetic susceptibility is obtained.The application further improves the calculation accuracy of ship induced magnetic field, and the calculation accuracy is better than 95%.

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