Abstract
Gains and phases delay induced by sensor position error would significantly degrade the performance of high-resolution two-dimensional multiple signal classification (2D-MUSIC) algorithm, which resulting in low positioning estimation accuracy and poor imaging. In this study, adaptive piezoelectric sensor array calibration based method is proposed for impact localization on composite structure. First, observed signal vector from the sensor array is represented by error calibration matrix with unknown gains and phases, and then it used to construct the cost function including sensor array parameters. Second, a 2D-MUSIC algorithm based on linear attenuation calibration is applied for estimating the initial estimate of impact location. Finally, substituting the initial estimate, the cost function is minimized by adaptive iterative to calculate the sensor array error parameters and the exact location of the impact source. Both finite element method (FEM) simulation and experimental results on carbon-fiber composite panel demonstrate the validity and effectiveness of the proposed method.
Highlights
Structural health monitoring is an emerging technology with signal processing technology to monitor the status of composite structures in real time or whenever necessary [1,2,3]
2D-multiple signal classification (MUSIC) algorithm based on linear attenuation calibration in ref. [11] is applied for estimating the initial estimate of impact location
Substituting the initial estimate, the cost function is minimized by adaptive iterative to calculate the sensor array error parameters and the exact location of the impact source
Summary
Structural health monitoring is an emerging technology with signal processing technology to monitor the status of composite structures in real time or whenever necessary [1,2,3]. Array signal processing for source localization is one of the major interests in many applications Over several decades, this topic was extensively studied and many algorithms have been proposed, such as spatial filter based method [6] and phased array based method [7]. Yang et al [9] proposed a MUSIC method based on array signal processing for impact source localization in a plate. He et al [10] developed an imaging method based on the time-reversal operator and MUSIC algorithm for damage imaging in a metallic plate. Those MUSIC based methods in the literature mentioned above require precise knowledge of the signals received from a standard source located at any direction
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