Liu Bin, He Luyao, Ma Zeyu, Zhang Hai, Sfarra Stefano, Fernandes Henrique, Perilli Stefano
College of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China.
Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, M5S 3G8, Canada; Department of Electrical and Computer Engineering, Computer Vision and Systems Laboratory, Laval University, Quebec, G1V OA6, Canada.
ISA Trans. 2019 Jun;89:272-280. doi: 10.1016/j.isatra.2018.12.009. Epub 2018 Dec 13.
Weak magnetic stress detection is an important issue in oil-gas pipeline internal detection area. In order to verify the characteristics of weak magnetic stress internal detection signals, we built herein a magneto-mechanics equivalent model having a balanced magnetic field. First, we calculated the relationship between the stress and the weak magnetic signals; consequently, the analysis propagation laws of the weak magnetic signals with non-magnetic saturation were pointed out. Finally, the theoretical model was validated by a systematic experimental research. The analytical results show that a one-to-one linear link between the weak magnetic signals and the stress concentration is clear. Instead, the change of the weak magnetic signals with the liftoff is nonlinear, therefore we are proposing the Boltzmann liftoff correction factor whose degree of adaptability of the equivalent model can reach the value of 94%. It is possible to note that when the liftoff is in the approximate linear stage, the relevance ratio and the recognition rate of the magneto-mechanics curve show a high-quality. This conclusion is important in the engineering field for the set of the liftoff.
弱磁应力检测是油气管道内检测领域的一个重要问题。为了验证弱磁应力内检测信号的特性，我们在此建立了一个具有平衡磁场的磁 - 力学等效模型。首先，我们计算了应力与弱磁信号之间的关系；进而指出了非磁饱和情况下弱磁信号的分析传播规律。最后，通过系统的实验研究对理论模型进行了验证。分析结果表明，弱磁信号与应力集中之间存在明确的一一对应线性关系。相反，弱磁信号随提离值的变化是非线性的，因此我们提出了玻尔兹曼提离校正因子，其等效模型的适应度可达94%。可以注意到，当提离处于近似线性阶段时，磁 - 力学曲线的相关率和识别率表现良好。这一结论在工程领域中对于提离值的设定具有重要意义。
