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Strain Sensors Optimal Placement for Vibration-based Structural Health Monitoring

THEODOROS LOUTAS, ALEXANDROS BOURIKAS

Abstract


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 is revisited in this paper. 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 numerical model of a composite sandwich panel serves as a representative aerospace structure upon which our investigations are based

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