Author(s)

V. Sukackas & R. Ramanauskas

Abstract

A PC simulation of the propagation of the Lamb waves in pipes V. ~ukackas' & R. ~amanauskas* I Physics Department, Kaunas University of Technology, Lithuania, 2 Baltical, Lithuania Abstract A new method of the simulating of the Lamb waves propagation in pipes was developed. The waves were excited and received by means of the point-form transducers of the longitudinal waves, contacting with the wall of the pipe. Such transducers radiate the antisymmetric Lamb waves of zero order. The wall is like an infinite plate for each direction of the wave propagation, when the diameter of the pipe is much greater than pipe's wall thickness. In this case, the use of beam model for simulating is possible. The wave reaches the receiving point not only directly by the shortest way, but also by rotating around of the circumference of the pipe 1,2,3,. . . times. The resulting wave is a superposition of all partial waves. A transient response corresponding the switching-on of the harmonic exciting voltage may be

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