Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
J Acoust Soc Am. 2011 Feb;129(2):691-700. doi: 10.1121/1.3531807.
Millions of miles of pipes are being used for the transportation, distribution, and local use of petroleum products, gas, water, and chemicals. Most of the pipes are buried in soil, leading to the significance of the study on the subject of guided wave propagation in pipes with soil influence. Previous investigations of ultrasonic guided wave propagation in an elastic hollow cylinder and in an elastic hollow cylinder coated with a viscoelastic material have led to the development of inspection techniques for bare and coated pipes. However, the lack of investigation on guided wave propagation in hollow cylinders embedded in infinite media like soil has hindered the development of pipe inspection methods. Therefore the influence of infinite media on wave propagation is explored in this paper. Dispersion curves and wave structures of both axisymmetric and nonaxisymmetric wave modes are developed. Due to the importance of the convergence of numerical calculations, the requirements of thickness and element number of the finite soil layer between hollow cylinder and infinite element layer are discussed, and an optimal combination is obtained in this paper. Wave structures are used for the mode identification in the non-monotonic region caused by the viscoelastic properties of coating and infinite media.
数以百万英里计的管道被用于石油产品、天然气、水和化学品的输送、分配和本地使用。大多数管道都埋在土壤中，这导致了研究受土壤影响的管道中导波传播的重要性。以前对弹性空心圆柱和涂有粘弹性材料的弹性空心圆柱中超声导波传播的研究导致了对裸管和涂敷管的检测技术的发展。然而，由于缺乏对埋设在土壤等无限介质中的空心圆柱中导波传播的研究，阻碍了管道检测方法的发展。因此，本文探讨了无限介质对波传播的影响。发展了轴对称和非轴对称波模式的频散曲线和波结构。由于数值计算收敛的重要性，讨论了空心圆柱与无限单元层之间有限土壤层的厚度和单元数量的要求，并在本文中获得了最佳组合。波结构用于由涂层和无限介质的粘弹性特性引起的非单调区域中的模式识别。
