| 刘洋,冯新.基于反射的L(0,1)导波的分段式管道腐蚀定量监测方法研究[J].,2023,63(4):416-426 |
| 基于反射的L(0,1)导波的分段式管道腐蚀定量监测方法研究 |
| Research on quantitative monitoring method of corrosion of jointed pipe based on reflectedL(0,1) guided wave |
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| DOI：10.7511/dllgxb202304012 |
| 中文关键词:分段式管道腐蚀壁厚损失反射的L(0,1)导波走时变化定量监测 |
| 英文关键词:jointed pipecorrosionwall thickness lossreflected L(0,1) guided wavetime-of-flight variationquantitative monitoring |
| 基金项目:国家自然科学基金资助项目(52079024)；国家重点研发计划资助项目(2022YFC3801000). |
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| 中文摘要: |
| 腐蚀导致管道壁厚减薄，进而降低管道的强度和完整性，威胁管道的运行安全．提出了一种基于反射的L(0,1)导波的分段式管道腐蚀定量监测方法．通过分析不同壁厚下管道中L(0,1)导波的变化规律，提出使用反射的L(0,1)导波走时变化作为壁厚损失敏感特征，建立了反射波走时变化与壁厚损失的理论关系，根据实测的反射波走时变化和该理论关系量化管道壁厚损失．开展了实验研究，在管道上激发L(0,1)导波，使用实测的反射波走时变化评价管道壁厚损失，并结合理论关系得到对应的壁厚损失．结果表明：通过反射波走时变化可以灵敏识别和准确量化管道壁厚损失，由反射波走时变化评估的壁厚损失与超声测试值较为一致．与已有的导波方法相比，所提方法提高了对管道壁厚损失的分辨率和量化精度．而且，该方法克服了超声测试只能逐点扫描，检测精度受多种因素影响，无法远程实时在线定量监测管道壁厚损失的不足． |
| 英文摘要: |
| Corrosion leads to the thinning of the wall thickness of the pipe, which reduces the strength and integrity of the pipe and threatens the operation safety of the pipe. A quantitative monitoring method for corrosion of jointed pipe based on the reflected L(0,1) guided wave is proposed. Through analyzing the variation rule of the L(0,1) guided wave in the pipe with different wall thicknesses, the time-of-flight (TOF) variation of the reflected L(0,1) guided wave is proposed as wall thickness loss (WTL)-sensitive feature. The theoretical relation between the TOF variation of the reflected wave and WTL is established, and the WTL of the pipe is quantified according to the measured TOF variation of the reflected wave and the theoretical relation. An experimental study is carried out, the L(0,1) guided wave is excited in the pipe, the measured TOF variation of the reflected wave is used to evaluate the WTL of the pipe, and the corresponding WTL is obtained combined with the theoretical relation. The results show that through the TOF variation of the reflected wave, the WTL of the pipe can be sensitively identified and accurately quantified, and the WTL evaluated by the TOF variation of the reflected wave is consistent with the value of ultrasonic testing. Compared with the existing guided wave methods, the proposed method improves the resolution and quantification precision of the WTL of the pipe. Moreover, this method overcomes the weaknesses of ultrasonic testing that can only point by point scan, the detection precision is affected by various factors, and can not quantitatively monitor the WTL of the pipe in the remote, real-time and online manner. |
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