The aim of this work presented here is to demonstrate the method for estimating the pipe wall thinning configuration: location, width, depth of pipe wall thinning in straight pipe based on velocity dispersions of longitudinal guided wave. First, group velocity dispersion curve is derived from frequency equation. Second, group velocity of longitudinal guided wave is analyzed using guided wave simulator for pipe with notch-shaped and ellipse-shaped circular pipe wall thinning. Finally, method for estimat...
英字タイトル:
Estimation of the Pipe Wall Thinning Configuration Based on Velocity Dispersions of Longitudinal Guided Wave

The aim of this work presented here is to analyze the mechanism of ultrasonic test signals in magnetic materials using electromagnetic acoustic transducer (EMAT). The coupling mechanism for EMAT between the electromagnetic fields and the applied excitation of ultrasonic wave are investigated. First, a nonlinear magnetic model in two dimensions is presented for the coupling mechanism. Secondly, the coupling mechanisms in ferromagnetic materials are studied analytically and numerically. Finally, the nume...
英字タイトル:
Analysis of Ultrasonic Source in Magnetic Materials Using Electromagnetic Acoustic Transducer