Parametric Density Concept for Guided Wave Attenuation Calculation in Fluid-Filled and Buried Steel Pipes

摘要

Attenuations of the fundamental longitudinal guided wave mode propagating in buried steel pipes, which transport different fluids, are numerically investigated. From the attenuation dispersion curves, two specific frequency values (1 MHz, 2.65 MHz) are selected to capture attenuation characteristics and, then the previously introduced parametric density concept is verified through parametric density versus attenuation curves. From the verification, it is shown that the concept of parametric density gives approximate attenuation values without a complex numerical attenuation calculation. This investigation may provide fundamental data to inspectors using ultrasonic guided-wave techniques in underground pipeline inspections.