# Adaptive Sensor Array Error Calibration Based Impact Localization on Composite Structure

^{1}

College of Mechanical and Electrical Engineering, Wenzhou University, Wenzhou 325035, China

^{2}

School of Mechanical and Electrical Engineering, Jinling Institute of Technology, Nanjing 2211169, China

^{*}

Author to whom correspondence should be addressed.

Received: 4 May 2020 / Revised: 5 June 2020 / Accepted: 10 June 2020 / Published: 11 June 2020

(This article belongs to the Special Issue Structural Health Monitoring & Nondestructive Testing 2020)

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.