5 April 2006 Experimental evaluation of instantaneous phase based index for structural health monitoring
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The sensitivity and consistency of a damage index based on instantaneous phase values obtained through vibration measurements of a structure is investigated experimentally. An 'empirical mode decomposition' is performed to decompose structural vibrations into a small number of 'intrinsic mode functions' following the methodology generally known as the Hilbert-Huang Transform. Instantaneous phase information is derived through the Hilbert transform of intrinsic mode functions. The damage index is based on the idea that the difference in phase functions between any two points on a structure is altered if the structure is damaged. Experimental investigations are performed on a beam structure with varying excitations (white noise signals), damage levels, and damage locations. The damage index shows generally consistent results, but its sensitivity to damages needs improvements for practical applications.
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Ratneshwar Jha, Ratneshwar Jha, Kevin Cross, Kevin Cross, Kerop Janoyan, Kerop Janoyan, Edward Sazonov, Edward Sazonov, Michael Fuchs, Michael Fuchs, Vidya Krishnamurthy, Vidya Krishnamurthy, } "Experimental evaluation of instantaneous phase based index for structural health monitoring", Proc. SPIE 6173, Smart Structures and Materials 2006: Smart Structures and Integrated Systems, 61731D (5 April 2006); doi: 10.1117/12.658730; https://doi.org/10.1117/12.658730

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