Single-mode Ultrasonic Guided Wave Extraction Method Based on Guided Wave Basis Function Projection Transformation
A method is proposed to address the multimodal and dispersive nature of ultrasonic guided waves in practical detection scenarios,where mixed signals with various modes are present at the same excitation frequency,affecting the sensitivity of guided wave detection.Based on the mathematical modeling of guided wave dispersion signals,a single-mode ultrasonic guided wave extraction method is introduced using guided wave basis function projection transformation.Initially,mathematical models for each modal guided wave signal are established using the dispersion transfer function.These modal guided wave signals are then formulated into a set of guided wave mode bases.Subsequently,employing the mode basis functions as the projection transformation kernel,the received signals undergo a projection transformation,enabling the effective extraction of single-mode guided wave signals from the superimposed multimodal signals without the need for dispersion compensation.Simulation and experimental signal processing involving Lamb waves and mixed modes on a plate demonstrate the efficacy of the proposed method in achieving the extraction of single-mode guided wave signals without requiring additional dispersion compensation steps,thereby simplifying the ultrasonic guided wave detection process and enhancing sensitivity to guided wave signals.
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