A self-synchronizing and low-cost structural health monitoring scheme based on zero crossing detection

Abstract : Owing to their high specific strength and stiffness, composite materials are increasingly being used in aeronautics and astronautics, but such materials are vulnerable to impact damage and delamination. Structural health monitoring (SHM) techniques have been developed for detecting such defects in recent years. In situ, self-powered and low-cost SHM systems are a developmental tendency of this technique. This paper introduces the principles of a low-cost and self-synchronizing scheme for SHM. Based on the Lamb wave interactions with the structure, the proposed technique relies on detecting zero crossing time instants in order to derive an estimation of the structural state. It is shown that such a method provides a very simple and low-cost way to assess the structural integrity while being computationally efficient. Experimental investigations carried out on a composite plate with an increasing penetration hold validating the proposed technique show its effectiveness for detecting the damage. The proposed approach has also been applied on an aircraft outboard flap to detect the impact damage. The robustness is discussed versus time-shift and magnitude jitter assumptions by using the plate case. The temperature effect is also considered by defining a coefficient array in order to compensate for the material property changes. Finally, an embedded implementation of such a SHM technique is presented by using the proposed damage index.
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Submitted on : Thursday, October 18, 2012 - 11:53:03 AM
Last modification on : Thursday, February 7, 2019 - 3:49:56 PM

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Daniel Guyomar, Mickaël Lallart, Kaixiang Li, Jean-Yves Gauthier, Thomas Monnier. A self-synchronizing and low-cost structural health monitoring scheme based on zero crossing detection. Smart Materials and Structures, IOP Publishing, 2010, 19 (4), 9p. ⟨10.1088/0964-1726/19/4/045017⟩. ⟨hal-00743160⟩

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