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Comparison of different excitation‐ and data sampling‐methods in structural health monitoring
Author(s) -
Maas Stefan,
Nguyen Viet Ha,
Kebig Tanja,
Schommer Sebastian,
Zürbes Arno
Publication year - 2019
Publication title -
civil engineering design
Language(s) - English
Resource type - Journals
ISSN - 2625-073X
DOI - 10.1002/cend.201800002
Subject(s) - structural health monitoring , excitation , stiffness , modal , compensation (psychology) , sampling (signal processing) , matrix (chemical analysis) , structural engineering , computer science , operational modal analysis , vibration , acoustics , modal analysis , environmental science , materials science , physics , engineering , telecommunications , composite material , electrical engineering , detector , psychoanalysis , psychology
Structural Health Monitoring with analysis of dynamic characteristics intends to detect stiffness changes caused by damage. It can be performed by vibrational tests resulting to modal parameters, that is, eigenfrequencies, damping, modeshapes, or modal masses. Those parameters are themselves informational and even allow often deducing the stiffness matrix. Based on that, it is possible to identify and to localize changes in the stiffness matrix due to damage, that is, localization and quantification of damage. However, changing test conditions, like ambient temperature or excitation force or existing nonlinearities of concrete, show important influence on damage indicators and hence need compensation prior to damage detection. Considering this background, this article focuses on comparing ambient excitation to forced excitation including appropriate exciters. Furthermore, continuous monitoring is discussed vs discrete testing in distinct time‐intervals. The intention of the comparison is to give an overview, that is, helpful for choosing appropriate measurement technique for the sake of correct damage detection subsequently.