声学
复杂几何
轮缘
航程(航空)
啁啾声
超声波传感器
宽带
情态动词
过程(计算)
频域
传感器
模式(计算机接口)
无损检测
时域
计算机科学
结构工程
工程类
材料科学
光学
几何学
物理
数学
电信
操作系统
航空航天工程
高分子化学
计算机视觉
激光器
量子力学
作者
Taeho Ju,Alp T. Findikoğlu
标识
DOI:10.1016/j.apacoust.2022.108749
摘要
Guided wave ultrasonic testing has been widely used for nondestructive and long-range evaluation of diverse mechanical structures, such as pipes and plates. In general, a large number of guided wave modes exist even in the simplest geometries, and they exhibit highly dispersive characteristics. Thus, sophisticated excitation methods and elaborate modal analyses need to be implemented to excite, acquire, and process well-defined pure modes as part of such a measurement method. If the interrogated structure has complex geometry, for example, with cross-sectional variations or multiple joints, the utilization of pure modes becomes significantly more difficult. To overcome this difficulty, this paper proposes the use of multi-mode, multi-frequency guided waves for long-range inspection of structures with arbitrarily complex geometries. Using broadband chirp signals and multi-mode time–frequency analysis in a prototypical complex pipe assembly that includes multiple pipe diameters, elbows, and flange connections, we experimentally show sensitive detection of mechanical changes (both material addition and loss). In addition, we demonstrate that the complexity of the structure can be modeled in the digital domain with sufficient detail to allow accurate numerical simulation of the acoustic response using this method.
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