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地下铁质管线经过地球磁场的磁化产生磁异常,对铁管磁异常进行数值分析可以帮助探测地下铁管的位置.为了在保证磁偶极子构造法地下铁质管线探测面磁异常正演准确性的前提下,尽量减少正演计算时间,在相对球坐标系中建立了管道单元划分策略分析模型,分析了测点空间位置对不同单元划分条件下磁异常计算差异的影响.研究结果表明:不同单元划分计算测点磁异常差异仅与距径比有关,相对误差与单元磁化率和外磁场特征无关;随着距径比增大,磁异常计算差异逐渐减小.在6.5倍距径比范围内,使用分块单元划分建立地下管线磁异常计算模型,在6.5倍距径比范围外,使用分节单元划分建立地下管线磁异常计算模型,不仅保证了管道磁异常正演计算的准确性,而且能够提高管道磁异常计算速率.
The underground pipeline can generate magnetic anomaly through the magnetization of the earth’s magnetic field, and the numerical analysis of the magnetic anomaly of the iron pipe can help to detect the location of the underground pipe.In order to make the magnetic anomaly accurately detect the surface of the underground iron pipeline in the magnetic dipole construction method , The paper analyzes the influence of the spatial position of measuring point on the difference of magnetic anomaly calculation under the condition of different unit division.The results of the research show that: The difference of magnetic anomaly measured by different cell division is only related to the aspect ratio, and the relative error has nothing to do with the unit magnetic susceptibility and the characteristics of the external magnetic field. As the aspect ratio increases, the difference of magnetic anomaly calculation gradually decreases. , A subdivision unit is used to establish the magnetic anomaly calculation model of underground pipelines. The calculation model of submarine pipelines magnetic anomaly is established using subdivision unit division outside the range of 6.5 times the span ratio, which not only ensures the accuracy of forward calculation of pipeline magnetic anomalies , But also can improve the calculation rate of pipeline magnetic anomaly.