Abstract
When evaluating the ship’s underwater electric field stealth, the underwater electric potential or the underwater electric field is often used, but it is easily affected by the environment conditions. As a result, the evaluating accuracy is not high. To solve this problem, the equivalent electric dipole moment is used as the evaluating factor in this paper. Firstly, the method of inverting the equivalent electric dipole moment in the frequency domain is proposed. However, the limited measuring range will also lead to some errors based on the proposed method. As a result, we improve the proposed method by applying an integral correction which uses a standard dipole source. To test the effectiveness of this method, a simulation experiment is carried out, and the results show that the method has high inversion accuracy even in a low signal-to-noise ratio (SNR) environment. This method has provided a new technological approach for evaluating the ship’s corrosion-related static electric field.
Highlights
4πσ −l where ρ(ξ) represents the current line density, σ represents the electrical conductivity, ξ represents the location of the source point, R2 (ξ − x)2 + (y0 − y)2, and K(ξ, P) represents the distance function between the source point and the field point
The ship’s static electric field can be viewed as an electric dipole field. e difference f(ω) between C1(ω) and C(ω) caused by a unit dipole moment can be obtained by using a unit standard dipole source moment by building the calculation model beyond the measuring range and implementing sine transform
It is difficult to obtain the accurate equivalent electric dipole moment of a real warship. erefore, the calculation results from BEASY software are used to verify the effectiveness of the proposed method
Summary
It can be known from equation (3) that the integral range is [−∞, +∞], but the measured range is limited within [−L, +L] in the actual measurement. E difference f(ω) between C1(ω) and C(ω) caused by a unit dipole moment can be obtained by using a unit standard dipole source moment by building the calculation model beyond the measuring range and implementing sine transform. Equation (22) indicates that, as the measuring range is limited, the standard electric dipole moment can be used to build the model. Equation (22) indicates that, as the measuring range is limited, the standard electric dipole moment can be used to build the model. en, the errors caused by the limited measuring range can be compensated by using the potential continuation
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