Research on impact location algorithm based on two-dimensional beam focusing method

Impact damage location research is one of the main problems of structural health monitoring. Real-time monitoring of impact damage on structures is highly necessary. In order to improve the accuracy of impact localization and the efficiency of sensor utilization, this paper proposes a two-dimensional beam focus impact localization algorithm based on cross array sensor arrangement. The number of sensors required for the conventional localization method is effectively reduced without losing the localization accuracy. Through the cross array piezoelectric sensor arrangement, the localization accuracy of the outer field can be greatly improved. In order to enhance the localization accuracy for the field between the sensors (inner field), this paper uses the four-point arc localization method to locate the impact in the inner field. So the localization of the impact of the entire board can be fulfilled with a highly improved accuracy. The effectiveness and practicability of the method are verified through the experimental research.