Near-Field 2D-MUSIC Algorithm Based Impact Localization Using Linear Array

Abstract

This research presents a near-field impact monitoring method based on the 2-D multiple signal classification method for the composite structure. Since elastic waves attenuate quickly in the composite structures and impacts may happen near the sensors, near-field impact monitoring method is important. However, most of the methods reported base on the far-field assumption. When impacts occurring not far enough from the sensors, this belongs to the near-field situation, where the elastic wave fronts are spherical and the plane wave hypothesis is no longer valid. To verify the proposed method, the experiment is preformed on composite plate structures. The localization results are in good agreement with the actual impact positions