Strain sensors optimal placement for vibration-based structural health monitoring. The effect of damage on the initially optimal configuration

We revisit the optimal sensor placement of engineering structures problem with an emphasis on in-plane dynamic strain measurements and to the direction of modal identification as well as vibration-based damage detection for structural health monitoring purposes. The approach utilized is based on the...

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Bibliographic Details
Published in:Journal of sound and vibration 2017-12, Vol.410, p.217-230
Main Authors: Loutas, T.H., Bourikas, A.
Format: Article
Language:English
Subjects:
Configurations
Damage detection
Degrees of freedom
Mathematical models
Modal analysis
Modal identification
Monitoring systems
Optimal sensor placement
Optimization
Placement
Redundancy
Sandwich panels
Sandwich structures
Sensors
Strain
Strain mode shapes
Structural damage
Structural health monitoring
Studies
Vibration
Vibration monitoring
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Summary:We revisit the optimal sensor placement of engineering structures problem with an emphasis on in-plane dynamic strain measurements and to the direction of modal identification as well as vibration-based damage detection for structural health monitoring purposes. The approach utilized is based on the maximization of a norm of the Fisher Information Matrix built with numerically obtained mode shapes of the structure and at the same time prohibit the sensorization of neighbor degrees of freedom as well as those carrying similar information, in order to obtain a satisfactory coverage. A new convergence criterion of the Fisher Information Matrix (FIM) norm is proposed in order to deal with the issue of choosing an appropriate sensor redundancy threshold, a concept recently introduced but not further investigated concerning its choice. The sensor configurations obtained via a forward sequential placement algorithm are sub-optimal in terms of FIM norm values but the selected sensors are not allowed to be placed in neighbor degrees of freedom providing thus a better coverage of the structure and a subsequent better identification of the experimental mode shapes. The issue of how service induced damage affects the initially nominated as optimal sensor configuration is also investigated and reported. The numerical model of a composite sandwich panel serves as a representative aerospace structure upon which our investigations are based.
ISSN:0022-460X
1095-8568
DOI:10.1016/j.jsv.2017.08.022