潜艇闭环消磁中外部空间磁场快速准确推算方法研究

The closed loop degaussing(CLDG) system can compensate the magnetic field outside the submarine in real time, so it becomes the study hotspot.It is the key technique for the submarine to realize the CLDG system that extrapolating the outside magnetic field fast and exactly by measuring the inside magnetic field. In order to satisfy the speed and precision simultaneously, a new extrapolation method is proposed to extrapolate the outside magnetic field. It combines the integral equation inverse method with the inside and outside mapping method. Many measures will be taken for decreasing the memory and calculation complexity of the integral equation inverse method. They includes thin shell simplification, ferromagnetic device simplification, nonlinear magnetised region density grid, inverse equation good pose and fast multipole technique. They can let the integral equation inverse method tend to practice. At the same time, it can provide exact magnetic field values inside and outside the submarine. In order to deal with the nonlinear part of the mapping relationship between the magnetic fields inside and outside the submarine, a neural network with high precision, robust and universality will be applied to create the mapping relationship. The real time and exact of the method will be verified by simulation and mock-up test. This research will lay a firm theory and technique foundation for improving the magnetic defence ability of our submarines.

闭环消磁系统可实时准确补偿潜艇外部空间磁场，因而是国际上的研究热点。通过测量内部磁场实现外部空间磁场的快速准确推算是潜艇闭环消磁的核心支撑技术。为同时满足推算速度与推算精度，提出一种新的推算方法，该方法结合了积分方程反演法和内外映射法各自的优点。为有效降低积分方程反演法的存储复杂度和计算复杂度，拟采用薄壳体简化积分、复杂铁磁设备简化建模、电流强非线性磁化区域加密剖分、反演方程良态化、快速多级子技术等多项处理措施，目的是使积分方程反演法实用化，同时为内外映射法提供准确的内外磁场数据；为处理内外磁场映射关系中的非线性因素，拟采用推算精度高、鲁棒性和泛化能力强的神经网络建立内外磁场映射关系，从而实现潜艇外部空间磁场的快速准确推算，并通过仿真计算和物理模型试验，验证方法的实时性和准确性。 通过上述研究，为我国潜艇磁性防护能力迈上新台阶奠定坚实的理论和技术基础。