A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Research on High-Precision Evaluation of Crack Dimensions and Profiles Methods for Underwater Structure Based on ACFM Technique
The conventional alternating current field measurement (ACFM) technique evaluates the crack dimensions by the distance between Bz peaks and the Bx trough. The interaction of the crack length and depth on the characteristic signals is not considered before, which results in the low accuracy evaluation results of crack dimensions and profiles. In the light of the problems above, the 3D simulation model of ACFM is set up in the underwater environment. The influence rules of the crack length and depth on the characteristic signals are analyzed. On this basis, the two-step interpolation crack dimensions evaluation algorithm and the segmentation interpolation crack profiles reconstruction algorithm are presented to achieve high-precision evaluation of crack dimensions and profiles. The underwater ACFM testing system is set up and the crack detection experiments are carried out. The results show that the crack depth does not affect the distance between the peak and trough of the Bz. The crack length that is shorter than 30 mm affects the trough of the Bx. The two-step interpolation algorithm based on the Bx and Bz can achieve high-precision evaluation of the crack length and depth. The maximum errors of the evaluated length and depth are 3.0 and 7.5% respectively. The segmentation interpolation algorithm based on the Bx can achieve high-precision visual reconstruction of the crack profile. The maximum error of the reconstructed profile is 5.7%.
Research on High-Precision Evaluation of Crack Dimensions and Profiles Methods for Underwater Structure Based on ACFM Technique
The conventional alternating current field measurement (ACFM) technique evaluates the crack dimensions by the distance between Bz peaks and the Bx trough. The interaction of the crack length and depth on the characteristic signals is not considered before, which results in the low accuracy evaluation results of crack dimensions and profiles. In the light of the problems above, the 3D simulation model of ACFM is set up in the underwater environment. The influence rules of the crack length and depth on the characteristic signals are analyzed. On this basis, the two-step interpolation crack dimensions evaluation algorithm and the segmentation interpolation crack profiles reconstruction algorithm are presented to achieve high-precision evaluation of crack dimensions and profiles. The underwater ACFM testing system is set up and the crack detection experiments are carried out. The results show that the crack depth does not affect the distance between the peak and trough of the Bz. The crack length that is shorter than 30 mm affects the trough of the Bx. The two-step interpolation algorithm based on the Bx and Bz can achieve high-precision evaluation of the crack length and depth. The maximum errors of the evaluated length and depth are 3.0 and 7.5% respectively. The segmentation interpolation algorithm based on the Bx can achieve high-precision visual reconstruction of the crack profile. The maximum error of the reconstructed profile is 5.7%.
Research on High-Precision Evaluation of Crack Dimensions and Profiles Methods for Underwater Structure Based on ACFM Technique
Yuan, Xin’an (author) / Li, Wei (author) / Zhao, Jianming (author) / Yin, Xiaokang (author) / Li, Xiao (author) / Zhao, Jianchao (author)
Recent Development of Alternating Current Field Measurement Combine with New Technology ; Chapter: 8 ; 131-145
2024-07-05
15 pages
Article/Chapter (Book)
Electronic Resource
English
Visual Reconstruction of Irregular Crack in Austenitic Stainless Steel Based on ACFM Technique
| Springer Verlag | 2024
Visual ACFM System Modeling and Optimization for Accurate Measurement of Underwater Cracks
| Springer Verlag | 2024
Operational experience with the ACFM inspection technique for subsea weld inspection
| British Library Online Contents | 1994
Numerical Simulation of a U-Shaped ACFM Inducer
| British Library Online Contents | 2015