Systems and methods for damage detection in structures using guided wave phased arrays

摘要

A method for ultrasonic guided wave defect detection in a structure is disclosed. The method includes driving a plurality of transducers to cause guided waves to be transmitted in the structure in a predetermined direction or focused at a predetermined focal point, receiving at least one reflected guided wave signal, and generating image data of the structure based on the at least one reflected guided wave signal. Processed image data are generated by performing at least one of baseline image subtraction or image suppression on the image data, and a location of at least one possible defect in the structure is identified based on the processed image data.

主权项

1. An ultrasonic guided wave system, comprising:
at least two guided wave transducers configured to be disposed on a structure, at least a first one of the at least two guided wave transducers configured to transmit shear horizontal guided wave energy in the structure in response to oscillating in a torsional mode, and at least a second one of the at least two guided wave transducers configured to detect shear horizontal guided wave energy in the structure; and a controller communicatively coupled to the at least two guided wave transducers, the controller including a processor configured to
cause the at least one of the at least two guided wave transducers to be pulsed such that shear guided wave energy is steered in a predetermined direction in the structure or is focused at a predetermined focal point, andprocess at least one reflected guided wave signal to identify a location of at least one possible defect in said structure, and wherein at least one of the at least two transducers is a circumferentially shear polarized d15 piezoelectric ring transducer.