相邻磁化磁体单元磁场等效合并特性分析  

Magnetic field characteristic analysis of equivalent-combined adjacent magnetized magnet elements

作　　者：郭智勇[1] 刘得军[1] 李常友[1] 杨玉麟[1] 

机构地区：[1]中国石油大学地球物理与信息工程学院,北京102249

出　　处：《海军工程大学学报》2014年第3期52-56,共5页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(41374151)

摘　　要：为了研究物性相同的相邻磁化磁体进行磁场等效拟合为单磁体的合理性,基于圆环电流理论磁体单元建立了相邻磁化磁体磁场计算模型;通过计算相邻磁体空间球面上的磁场,以等效磁场模量绝对误差最小建立了单磁体物性参数等效拟合反演目标函数,使用遗传模式搜索算法进行了反演参数求解。研究结果表明:拟合单磁体与原相邻磁化磁体单元的磁远场分布一致,磁场等效拟合磁通密度模相对误差随拟合球面半径增大而减小,同一球面上相对误差随外磁场夹角增大而先增大后减小,相对误差与材料磁各向异性及单元绝对边长无关。研究结果论证了磁化磁体单元磁场等效合并的合理性,能够为隐蔽性铁磁体所致磁异常数值模拟单元合并提供理论依据与误差评价准则。To verify the rationality of the magnetic field equivalent of adjacent magnets which have the same properties as a single magnet, a calculation model for the magnetic field of adjacent magnetized magnets is established based on the theory of circular-current magnet. The objective function is determined according to the minimum absolute modulus error between the magnetic field of adjacent magnetized magnets and that of equivalent single magnet at identical points. The genetic pattern search algorithm is used to obtain the inversion parameters. The results show that the long-distance magnetic field of the fitting single-magnet is identical to that of adjacent magnets, the relative error of magnetic flux density modulus decreases as the spherical radius increases, and the relative error of the same sphere initially increases and then decreases with an increase in field angle. Furthermore, the relative error has no relation with the magnetic anisotropy and the absolute length of magnet unit. Studies verify the rationality of combined magnetic field calculation, which can provide a theoretical basis for merging units and an evaluation criterion for fitting error estimates as far as the numerical simulation of magnetic anomaly induced by latent ferromagnetic objects is concerned.

关 键 词：磁化磁体 磁场等效 磁体合并 磁体参数反演 圆环电流 

分 类 号：O411.6[理学—理论物理]