一种舰艇磁隐身中磁场推算的新方法  

A New Magnetic Field Extrapolation Method in Magnetic Silencing of Ships

作　　者：周国华[1] 肖昌汉[1] 刘胜道[1] 隗燕琳[1] 

机构地区：[1]海军工程大学电气与信息工程学院,湖北武汉430033

出　　处：《兵工学报》2009年第7期951-957,共7页Acta Armamentarii

基　　金：国家海洋专项基金资助项目(420050101)

摘　　要：推算舰艇下方空间磁场分布规律可为舰艇磁隐身技术的实施提供必要的理论依据。为有效解决舰艇传统磁场推算方法中存在的困难,从边界元理论出发,推导了基于等效面磁荷密度的磁场推算正演模型。为求解正演模型中面磁荷磁性参数,根据磁场测量数据建立了磁性参数反演模型。由于实际舰艇磁性检测中所得磁场信息的局部性,反演模型通常是病态不适定问题。为有效抑制实际磁性检测中测量误差对计算结果引起的干扰,应用Tikhonov正则化方法对其进行求解,提高了反演结果的稳定性。由反演模型和正演模型即可实施对舰艇磁场的推算。用数值算例和船模实验对磁场推算方法的有效性和实用性进行了检验。结果表明,基于等效面磁荷密度和Tikhonov正则化方法的磁场推算技术可有效进行舰艇磁场推算,具有较好的军事实用价值。Extrapolation of the underwater magnetic field distribution below ships can provide necessary theoretical basis for the implementation of magnetic silencing technique. In order to effectively overcome the difficulties, which are often met in magnetic field extrapolation by traditional continuation methods, a direct model for magnetic field extrapolation based on equivalent surface magnetic charge intensity was derived from the boundary theory. Then an inverse model was given based on the measured magnetic field to calculate surface magnetic charge density. Due to lack of the enough measured physical information, the inverse model is always ill posed. The inverse problem was solved by Tikhonov regularization method, which can suppress the disturbance of measurement error to the calculated equivalent surface magnetic charge intensity and improve the stability of the inversed results. Based on the direct model and the inverse model, the magnetic field of ships can be extrapolated. Finally, a numerical example and a scale model ship experiment were given to verify the effectiveness and practicality of the magnetic field extrapolation. The verified results show that the proposed method is sarisfying for magnetic field extrapolation of ships, and has some military value in practical engineering.

关 键 词：电磁学 磁场推算 面磁荷 正则化方法 磁隐身 

分 类 号：TM153.1[电气工程—电工理论与新技术]