Investigation of acoustic structure interaction for flawed structure

Abstract

This paper is an attempt to establish a procedure for 2D quantization of a flaw. In this study, Tin (Sn) a regularly occurring flaw in structural Steel is considered. Using COMSOL 4.2, a 2D transient pressure acoustic model is created, which consists of a 70mm×70mm structural Steel plate with four acoustic transceivers 90 degree apart (each providing 5cycles of 1Mhz sequential sinusoidal excitation) placed along its perfectly reflecting boundary. The signals obtained from the transceivers are post processed using FFT techniques and are further processed for image reconstruction. From the statistical analysis the position of the flaw is determined. The mean deviation from the actual central location of the flaw to the predicted location is (1.136mm, 0.979mm).