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空间天气影响下的钢制油气管道会产生地磁感应电流,地磁感应电流能够加速管道腐蚀,干扰管道监测装置,危及人身安全.为了研究管道地磁感应电流的非线性动力学特性,首先基于线传输理论,建立了管道地磁感应电流模型,并应用Melnikov方法对模型进行分析,揭示了地磁场与管道系统相互作用而产生混沌的机理,指出管道地磁感应电流具有出现混沌的可能性.其次,以中国西气东输一线管道中卫处6次磁暴事件数据为例,依据功率谱分析法、主分量法、关联维数法、Lyapunov指数法等多种混沌判别方法,对计算得到的地磁感应电流时间序列作了定量和定性的分析,进一步验证理论分析的结果.数学模型和实际数据两方面都表明:在空间天气影响下,埋地钢制管道系统内的地磁感应电流具有混沌特性,为空间天气影响下的钢制油气管道保护提供了理论依据.
Geomagnetic induction current will be produced by steel gas pipeline under the influence of space weather, geomagnetic induction current can accelerate pipeline corrosion and interfere with pipeline monitoring device, endangering personal safety.In order to study the nonlinear dynamic characteristics of pipeline geomagnetic induction current, , The geomagnetic induced current model of pipeline is established and the Melnikov method is used to analyze the model to reveal the mechanism of interaction between geomagnetic field and pipeline system to generate chaos.The paper points out that the geomagnetic induced current of pipeline has the possibility of chaos.Secondly, Taking the data of 6 magnetic storm events at Zhongwei section of gas transmission pipeline as an example, according to various chaotic discrimination methods such as power spectrum analysis, principal component method, correlation dimension method and Lyapunov exponent method, the calculated geomagnetic induced current time series Quantitative and qualitative analysis to further verify the theoretical analysis of the results.Mathematical model and the actual data both show that: under the influence of space weather, the geomagnetic induced current in the buried steel pipeline system has chaos characteristics, which is under the influence of space weather Of the steel pipeline protection provided a theoretical basis.