Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings (2013) / Chapter Skim
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Pages 47-51
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47 a p p e N D I x G Introduction This appendix describes the progress of a particular nondestructive testing (NDT) technique known as acoustic sounding and outlines how this system will work within the framework of the SHRP 2 Renewal Project R06G.
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48 The vibration frequencies increase as the voided sections of tile decrease (Liu et al.
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49 Figure G.1. Debonded regions of tile ( left )
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50 The research team also recommends developing an application for a smart phone that would signal whether a tile is likely debonded or bonded. A threshold value could be chosen to represent bonded tile, and significant deviations from that threshold would result in a pass (green)
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From page 51... ...
51 distinguish fundamental frequencies from the ambient noises present in a tunnel. The proof-of-concept method presented above used recordings from a smart phone video recorder and then processed the data with MATLAB code.
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