| 闫孝姮,李朝政,陈伟华,王 帅.煤矿主接地电极腐蚀超声 SH 波检测方法研究[J].电子测量与仪器学报,2023,37(7):230-242 |
| 煤矿主接地电极腐蚀超声 SH 波检测方法研究 |
| Study on structural corrosion detection of main grounding electrode in coal mine based on ultrasonic SH wave |
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| DOI： |
| 中文关键词: 主接地电极 腐蚀缺陷检测 SH 波 频散方程 |
| 英文关键词:main grounding electrode corrosion defect detection SH wave dispersion equation |
| 基金项目:辽宁省教育厅科学技术研究创新团队( LT2019007) 、辽宁工程技术大学学科创新团队( LNTU20TD-02,29) 项目资助 |
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| 中文摘要: |
| 煤矿井下主接地电极腐蚀检测对于保护工作人员的安全起着极其重要的作用,当前通过运至井上人工肉眼检测的方法
耗时耗力且无法定损,因此本文提出了一种基于超声 SH 波回波特性的煤矿井下主接地电极在线腐蚀检测新方法。 首先推导
了液浸板结构中 SH 波的频散方程,选取频散小、传播距离长的零阶 SH 波作为检测激励信号,建立液浸板结构有限元模型,确
定了最佳超声激励频率;其次构建煤矿主接地电极声-固-流多物理场耦合检测模型,仿真研究超声 SH0 波在主接地电极上的传
播特性以及对于腐蚀的检测能力,分析了 1~ 5 mm 腐蚀深度以及 5~ 25 mm 腐蚀半径下的回波信号特征;最后搭建了煤矿主接
地电极无损检测系统,开展了实验验证工作。 实验结果表明,通过超声 SH 波检验井下主接地电极腐蚀缺陷具有可行性,在
500 mm×375 mm×5 mm 的主接地极板上腐蚀定位误差为 5. 64%,同时腐蚀信号的幅值与不同程度的腐蚀缺陷与成正相关性,
为煤矿井下主接地电极腐蚀检测以及腐蚀程度的定量评估提供了一种有效的方法。 |
| 英文摘要: |
| The corrosion detection of main ground electrode in underground coal mine is crucial to the safety of the staff. Traditional
manual visual inspection detection by transporting the electrode overground is time-consuming and the damage magnitude cannot be
confirmed. Therefore, a new online corrosion detection method based on ultrasonic SH wave echo characteristics is proposed. Firstly, the
dispersion equation of SH wave in the liquid-immersed plate structures is derived. The zero-order SH wave with small dispersion and long
propagation distance is selected as the detection excitation signal, and the finite element model of liquid-immersed plate structure is
constructed to determine the optimal ultrasonic excitation frequency. Secondly, the coupled flow-solid-acoustic multi-physical field
detection model of the main grounding electrode in coal mines is constructed and the corrosion detection ability of ultrasonic SH0 wave on
the main ground electrode is studied by simulation, then the echo signal characteristics under 1 ~ 5 mm corrosion depth and 5 ~ 25 mm
corrosion radius are analyzed. Finally, the non-destructive testing system of the main ground electrode in coal mine is constructed, and
experimental verification is carried out. The experimental results prove the feasibility of the proposed method, the corrosion location error
is 5. 64% on a 500 mm×375 mm×5 mm main grounding plate, the corrosion signal amplitude is positively correlated with the magnitude
of corrosion defects. The research provides an effective method for corrosion location and damage assessment of underground coal mine
main ground electrode. |
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