Influence of snow on parameteres of elastic waves induced in the ice covering

V. M. Kozin^a, V. Yu. Vereschagin<sup>b

a</sup> Institute of Metallurgy and Mechanical Engineering Far-Eastern Branch of RAS, Konsomolsk-na-Amure
^b Amurskii Humanities Pedagogical State University

Abstract: The physical modeling resultsdemonstrate the ability to diagnose instability of above-groundpipelinesupports using acoustic noiserecorded on the pipe surface. It is shown that developed in recent years method of extraction coherent components of noise field allows to determine frequencies and geometric shapes of flexural standing waves in pipelines. This information can be used to estimate the stabilityof pipeline supports. Supportinstabilityincreasing the span between rigid pipeattachments manifests itself in a dramatic restructuring of thestanding waves field formed in the pipe by acoustic noise.

Keywords: pipelines, supports instability, noise field, standing waves, physical modelling.

UDC: 629.124.791

Received: 12.07.2012