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为了研究包裹防腐层的油气管道中的剪切周向导波传播规律,建立了包裹防腐层的油气管道模型。利用连续介质力学和声学等相关知识,得到了包裹防腐层的油气管道中的剪切周向导波理论。依据理论结果编制了相应的计算机程序,并对包裹防腐层的油气管道中的剪切周向导波进行了数值模拟和深入分析。结果表明:包裹防腐层的油气管道中的剪切周向导波的模式1不存在截至频率,高阶模式均存在截至频率,4种模式的能量均随频率的增大而越来越集中于防腐层。因此,针对实际的管道参数选择合适的导波模式和频段对于开展管道无损检测作业具有重要意义。
In order to study the rule of shearing circumferential guided wave propagation in oil and gas pipelines wrapped with anti-corrosion coating, an oil and gas pipeline model with anti-corrosion coating was established. Using the related knowledge of continuum mechanics and acoustics, the circumferential shear wave theory in oil and gas pipelines wrapped with anticorrosive coatings was obtained. Based on the theoretical results, the corresponding computer program was compiled and the numerical simulation and in-depth analysis of the shearing circumferential guided wave in the oil-gas pipelines wrapped with anticorrosive coatings were carried out. The results show that there is no cut-off frequency in the shear-guided wave mode of oil and gas pipelines wrapped with anti-corrosion coating, and the cut-off frequencies exist in the high-order modes. The energy of the four modes increases with the increase of the frequency, Floor. Therefore, it is of great significance to select suitable guided wave mode and frequency band for the actual pipeline parameters for NDT operation.