Abstract
Piezoelectric sensors array based damage imaging method as a high resolution source localization algorithm is becoming a promising method in structural health monitoring (SHM) technology. However, the environmental variations could affect the gain-phase of array signal. This paper experimentally evaluates the environmental effects on piezoelectric sensors array, and presents a compensated 2D-MUSIC based damage imaging method for composite structures. Firstly, detailed analysis and comparison discussion about the gain-phase difference of array signal when the environmental parameters change, and the gain-phase changes respect to the environmental parameters could be obtained. Secondly, array error matrix is structured and substituted into the steering vector of the original 2D-MUSIC algorithm to compensate. Finally, the compensated 2D-MUSIC algorithm is applied for estimating the initial estimates of damage. After substituting these initial estimates, the cost function is minimized by adaptive iterative calculating the reasonable location of the damage source. The experiments on an epoxy laminate plate demonstrate the validity and effectiveness of the proposed method.
Highlights
Structural health monitoring (SHM) is perceived as a significant method for determining the integrity of structures since it could provide an early indication of physical damage [1,2]
With the aim to solve the environmental effects on array signal, a compensated 2DMUSIC-based damage imaging method for composite structures is introduced in this paper
The observed data modal considering imprecise gain-phase signals in sensor array induced by variable temperature environments is built using the 2D-Multiple signal classification (MUSIC) algorithm
Summary
Structural health monitoring (SHM) is perceived as a significant method for determining the integrity of structures since it could provide an early indication of physical damage [1,2]. Compact piezoelectric sensor array based damage imaging method as a high resolution source localization algorithm becomes a promising method in structural health monitoring (SHM) technology. Wang et al [5] presented a Lamb wave and linear piezoelectric lead zirconate titanate (PZT) array-based monitoring method for the detection and quantification of crack damage on a T6061 aluminum plate. Ren et al developed a scanning spatial-wavenumber of guided wave-based imaging method for multiple damages [8] and multi-impact [9] on aircraft composite structures. With the aim to solve the environmental effects on array signal, a compensated 2DMUSIC-based damage imaging method for composite structures is introduced in this paper. Construct a cost function J in ref. [20], the correct estimates of (r, θ) could be acquired by minimizing the cost function
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