scholarly journals Damage Characterization Using Matching Pursuit with a Guided Wave Simulation Library

2015 ◽  
Author(s):  
Matthew B. Obenchain ◽  
Carlos E. Cesnik
Keyword(s):  
Matching Pursuit ◽  
Guided Wave ◽  
Wave Simulation ◽  
Damage Characterization

A Simplified Dispersion Compensation Algorithm for the Interpretation of Guided Wave Signals

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Wenjun Wu ◽  
Yuemin Wang
Keyword(s):  
Guided Waves ◽  
Matching Pursuit ◽  
Dispersion Compensation ◽  
Wave Dispersion ◽  
Guided Wave ◽  
Center Frequency ◽  
Practical Applications ◽  
Compensation Algorithm ◽  
Nonlinear Phase ◽  
Mode Separation

Due to the multimodal and dispersive characteristics of guided waves, guided wave testing signals are always overlapped and difficult to separate for correct interpretations. To this end, a simplified dispersion compensation algorithm is put forward in this paper. The dispersion elimination is accomplished by compensating the second-order nonlinear phase shift of guided wave signals, which is the cause of the dispersion when narrow band exciting signals are used. This algorithm is easy to implement and has no need of prior knowledge of the guided wave dispersion relationship. Considering that the center frequency, which is a key parameter for this algorithm, is nearly impossible to determine accurately in practical applications, the effect of the center frequency deviation on the algorithm is further studied. Both theoretical analysis and numerical simulation indicate the insensitivity of the algorithm to the deviation of the center frequency, and hence, there is no need to determine the center frequency accurately, facilitating the practical use of the algorithm. Based on this simplified dispersion compensation algorithm and in cooperation with the matching pursuit method, the mode separation is further performed for interpreting of overlapped guided wave signals. Dispersion compensation is first applied to the testing signal with respect to a certain mode which will compress the waveform of the mode while the others still spread. Then, this compressed waveform is separated with the Gabor based matching pursuit method. Both simulation and experiment are designed to demonstrate the effectiveness of the proposed methods.

The Present Development Situation of Laser Ultrasonic Nondestructive Testing Signal Processing System

2012 ◽  
Vol 532-533 ◽  
pp. 369-373
Author(s):  
Lie Xiang Xia ◽  
Yan Zhao ◽  
Yong Zhong Ma ◽  
Xiao Ning An
Keyword(s):  
Signal Processing ◽  
Nondestructive Testing ◽  
Detection System ◽  
Matching Pursuit ◽  
Ultrasonic Inspection ◽  
Processing System ◽  
Guided Wave ◽  
Ultrasonic Nondestructive Testing ◽  
Laser Ultrasonic ◽  
Signal Processing System

Currently, laser ultrasonic nondestructive testing is the best application prospect of nondestructive testing methods. This paper expounds the mechanism and the qualitative analysis of the common defects of the laser ultrasonic inspection and introduces the application of matching pursuit algorithm guided wave testing technology in signal processing. This paper focuses on the laser ultrasonic detection system and analysis of the detected data using the finite element method.

scholarly journals An Improved Matching Pursuit-Based Temperature and Load Compensation Method for Ultrasonic Guided Wave Signals

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 67530-67541 ◽  
Author(s):  
Yishou Wang ◽  
Geng Wang ◽  
Di Wu ◽  
Yue Wang ◽  
Bingrong Miao ◽  
...  
Keyword(s):  
Matching Pursuit ◽  
Guided Wave ◽  
Compensation Method ◽  
Load Compensation ◽  
Ultrasonic Guided Wave
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