THE USE OF BASELINE MEASUREMENTS FOR IMPROVED DAMAGE DETECTION USING DAMAGE LOCATION VECTORS | ||||
The International Conference on Applied Mechanics and Mechanical Engineering | ||||
Article 103, Volume 13, 13th International Conference on Applied Mechanics and Mechanical Engineering., May 2008, Page 95-104 PDF (346.2 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/amme.2008.39694 | ||||
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Authors | ||||
MOSTAFA K. F.1; ARAFA M. H.2 | ||||
1Graduate student, Auburn Science and Engineering Center, The University of Akron, Akron, OH, USA. | ||||
2Assistant Professor, Mechanical Engineering Department, American University in Cairo, Cairo, Egypt. | ||||
Abstract | ||||
ABSTRACT Vibration-based techniques are increasingly being recognized as effective nondestructive structural damage identification tools. One promising technique relies on combining a finite element model (FEM) of the structure under investigation with a set of experimental frequency response functions (FRFs) to construct a so-called damage location vector (DLV). Emphasis in this paper is placed on investigating, both theoretically and experimentally, damage detection using DLVs while attempting to achieve an enhanced sensitivity through comparisons with baseline measurements of an initially damaged structure. To this end, the method is first studied theoretically on a space truss using simulated damage to illustrate its capability. The method is then improved to handle randomly assigned initial damage that is not predicted by the FEM through subtraction and normalization of the DLV with respect to baseline data. The improved method is finally tested experimentally on cantilever beams provided with damage of various sizes. The proposed technique is effective in identifying damage that would otherwise be concealed within an initially damaged structure, and provides useful insight into the location and severity of damage. | ||||
Keywords | ||||
Vibration-based damage detection; damage location vector | ||||
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