Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track
1
Shanghai Institute for Advanced Communication and Data Science, School of Communication and Information Engineering, Shanghai University, Shanghai 200444, China
2
School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1788; https://doi.org/10.3390/ma12111788
Received: 3 April 2019
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Revised: 12 May 2019
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Accepted: 31 May 2019
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Published: 2 June 2019
(This article belongs to the Special Issue Non-destructive Inspection)
This paper aims to adopt the total focusing method (TFM) and wavenumber method for characterizing a delamination in ballastless slab track. Twelve dry point contact (DPC) transducers located at the upper surface of the slab track compose a linear array. These transducers are employed to actuate shear waves, which are suitable for identifying the delamination. The technique of removing the surface wave has been implemented for only retaining the scattered wave caused by the delamination and the reflected wave from the bottom of bed plate. Numerical and experimental results demonstrate that the delamination and bottom of the bed plate can be identified by the proposed methods. Furthermore, the near-surface pseudomorphism is distinctly restrained after removing the surface wave. Compared to TFM, the wavenumber method has the great advantages of improving computational performance and lateral resolution. However, they have no significant difference in the longitudinal resolution. Furthermore, it has been confirmed that the lateral resolution can be affected by the amount of transducers. This paper can provide valuable suggestions on improving the computational performance and the imaging accuracy when we identify a delamination in ballastless slab track.
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Keywords:
wavenumber method; delamination; ballastless slab track; shear waves; removing the surface wave; resolution
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MDPI and ACS Style
Fan, G.; Zhang, H.; Zhu, W.; Zhang, H.; Chai, X. Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track. Materials 2019, 12, 1788. https://doi.org/10.3390/ma12111788
AMA Style
Fan G, Zhang H, Zhu W, Zhang H, Chai X. Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track. Materials. 2019; 12(11):1788. https://doi.org/10.3390/ma12111788
Chicago/Turabian StyleFan, Guopeng, Haiyan Zhang, Wenfa Zhu, Hui Zhang, and Xiaodong Chai. 2019. "Numerical and Experimental Research on Identifying a Delamination in Ballastless Slab Track" Materials 12, no. 11: 1788. https://doi.org/10.3390/ma12111788
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