Defect detection performance of the UCSD non-contact air-coupled ultrasonic guided wave inspection of rails prototype

2016 ◽  
Author(s):  
Stefano Mariani ◽  
Thompson V. Nguyen ◽  
Simone Sternini ◽  
Francesco Lanza di Scalea ◽  
Mahmood Fateh ◽  
...  
Keyword(s):  
Defect Detection ◽  
Detection Performance ◽  
Guided Wave ◽  
Ultrasonic Guided Wave

Defect detection in pipes using Van der Pol systems based on ultrasonic guided wave

2021 ◽  
pp. 104577
Author(s):  
Jing Wu ◽  
Fei Yang ◽  
Lin Jing ◽  
Zhongming Liu ◽  
Yizhou Lin ◽  
...  
Keyword(s):  
Defect Detection ◽  
Guided Wave ◽  
Van Der Pol ◽  
Ultrasonic Guided Wave

scholarly journals Research on ultrasonic guided wave dispersion compensation for steel strand defect detection

2020 ◽  
Vol 740 ◽  
pp. 012101
Author(s):  
Molin Zhao ◽  
Haisheng Wang ◽  
Bin Xue ◽  
Yonggang Yue ◽  
Pengfei Zhang ◽  
...  
Keyword(s):  
Defect Detection ◽  
Dispersion Compensation ◽  
Wave Dispersion ◽  
Guided Wave ◽  
Ultrasonic Guided Wave ◽  
Steel Strand

scholarly journals Improved Defect Detection of Guided Wave Testing Using Split-Spectrum Processing

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4759
Author(s):  
Seyed Kamran Pedram ◽  
Tat-Hean Gan ◽  
Mahdieh Ghafourian
Keyword(s):  
Defect Detection ◽  
Background Noise ◽  
Structural Integrity ◽  
Traditional Approach ◽  
Signal To Noise Ratio ◽  
Guided Wave ◽  
Signal Quality ◽  
Ultrasonic Guided Wave ◽  
Split Spectrum ◽  
Dispersive Propagation

Ultrasonic guided wave (UGW) testing is widely applied in numerous industry areas for the examination of pipelines where structural integrity is of concern. Guided wave testing is capable of inspecting long lengths of pipes from a single tool location using some arrays of transducers positioned around the pipe. Due to dispersive propagation and the multimodal behavior of UGW, the received signal is usually degraded and noisy, that reduce the inspection range and sensitivity to small defects. Therefore, signal interpretation and identifying small defects is a challenging task in such systems, particularly for buried/coated pipes, in that the attenuation rates are considerably higher compared with a bare pipe. In this work, a novel solution is proposed to address this issue by employing an advanced signal processing approach called “split-spectrum processing” (SSP) to minimize the level of background noise and enhance the signal quality. The SSP technique has already shown promising results in a limited trial for a bar pipe and, in this work, the proposed technique has been experimentally compared with the traditional approach for coated pipes. The results illustrate that the proposed technique significantly increases the signal-to-noise ratio and enhances the sensitivity to small defects that are hidden below the background noise.

scholarly journals Numerical Modelling of Ultrasonic Guided Wave Propagation and Defect Detection in Offshore Steel Sheet Piles

2021 ◽  
Vol 11 (9) ◽  
pp. 4076
Author(s):  
Anuj Dhutti ◽  
Anurag Dhutti ◽  
Sergio Malo ◽  
Hugo Marques ◽  
Wamadeva Balachandran ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Numerical Modelling ◽  
Defect Detection ◽  
Steel Sheet ◽  
Signal Amplitude ◽  
Corrosion Current ◽  
Guided Wave ◽  
Excitation Signal ◽  
Ultrasonic Guided Wave ◽  
The Web

Sheet piles are significantly more prone to advanced corrosion rates due to accelerated low water corrosion. Current inspection and assessment techniques are costly, time-consuming and labour-intensive. Guided wave testing (GWT) has gained increased attention due to its capability of screening long distances; however, it has not been used previously to inspect the active zone in steel sheet piles. This paper focuses on the numerical modelling of wave propagation and defect detection in U-shaped piles to demonstrate the capabilities of GWT for the inspection of non-accessible areas of steel sheet piles. Two shear transducer arrays were designed, bearing high SH0 mode purity and directionality. A wave propagation comparison study concluded that the back wall reflection signal from the web of a U-pile was 11.5% higher than the respective signal from the plate, and the excitation signal in the flange, at 5.65 m and 7.12 m, was respectively 35% and 46% less than the excitation signal in the web at the same distance. Defect reflection, measured from five representative defect scenarios, ranged from 7.5 to 47% of the signal amplitude in the web of the pile and 5 to 32.5% in the flange of the pile.

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