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Experimental validation of the higher‐order derivative discontinuity method for damage identification
Author(s) -
Gauthier Javier F.,
Whalen Timothy M.,
Liu Judy
Publication year - 2008
Publication title -
structural control and health monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.587
H-Index - 62
eISSN - 1545-2263
pISSN - 1545-2255
DOI - 10.1002/stc.210
Subject(s) - classification of discontinuities , discontinuity (linguistics) , structural engineering , beam (structure) , identification (biology) , distortion (music) , stiffness , computer science , engineering , mathematics , mathematical analysis , electronic engineering , amplifier , cmos , botany , biology
A damage identification method based upon fourth derivatives of the mode shapes is proposed and demonstrated on laboratory and field applications. The higher‐order derivative discontinuity (HODD) method is based on the premise that localized damage will cause large discontinuities in the magnitude of the fourth derivative. The HODD method, which is applicable to beam‐like structures, does not require a reference to the undamaged state of the structure. The method includes algorithms to estimate the fourth derivatives, to detect possible damage locations, and to assess statistical significance and objectively eliminate false‐positive indications of damage. The HODD method is demonstrated on an aluminium beam, and fibre‐reinforced polymer beam, and a full‐scale plate girder bridge. Crack and delamination damages are physically simulated and successfully located in the presence of real‐life noise. The HODD method is accurate in locating damage corresponding to stiffness reductions as low as 0.15%. The results also demonstrate the importance of the statistics‐based parameters for accurate damage detection. Copyright © 2007 John Wiley & Sons, Ltd.