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Our goal is to calculate the induced magnetic anomaly caused by thin ferromagnetic objects immerged into an applied uniform magnetic field. A good solution to this open boundary problem is to use integral equation method. The major difficulty in magnetostatic modeling of thin ferromagnetic objects is the disproportion between the global size and the thickness of thin ferromagnetic objects. According...
The principle of the closed loop degaussing (CLDG) system is based on a real-time anomaly evaluation by using internal magnetic sensors. This paper focuses on the problem of deployment regions of these sensors for double hull submarines. The six hexahedral surface integral equation method is used to calculate the magnetic anomaly of a double hull submarine simulation mock-up when the magnetic moments...
A wide interest arises in magnetic anomaly detection due to its application in many areas. In the inverse problems of magnetic anomaly detection, localization technique of magnetic objects is always focused on. In some cases, there is an increasing need for automatic magnetic detection technique in real time. Based on Eulerpsilas homogeneity equation, a real-time localization model was founded with...
Magnetic anomaly detection has been applied in civil and military areas. In the inverse problems of magnetic anomaly detection, a mathematical model was founded to estimate magnetic moments by minimizing the least-squares error at the observation points. Hopfield neural network was applied to solve the above optimization model and a self-adaptive correction algorithm was taken to improve the robustness...
Some magnetic objects such as steel hull submarines have complex geometry and so their magnetizations are usually inhomogeneous. In many areas, it is interesting to build a magnetic model of a magnetic object with measurement data of the magnetic field. This is an inverse problem. The paper considers the condition number of the coefficient matrix as the objective function and uses genetic algorithm...
Triaxial fluxgate magnetometer is a basic instrument in the measurement of magnetic field, but the horizontal coordinate plane of such a magnetometer is not always precisely parallel to the plane of its horizontally placed base. So it leads to some measurement errors. In order to solve this problem, a method of conjugate gradient optimization is applied to find the horizontal error angles which can...
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