Abstract
This work assesses the accuracy of a structural health monitoring (SHM) technique previously presented in the literature. The SHM technique under exam relies on a modal decomposition method and is intended to reconstruct the distributed deflection and strain fields from point-wise strain measurements at known locations. The objective of this work is to assess the reliability of such algorithm to variations of sensors number and their location. To this aim, the problem of a simply supported beam subjected to an impulsive loading is solved analytically and the results are used as synthetic input data for the SHM algorithm. The robustness of the SHM methodology has been also evaluated against erroneous choices of modal basis. Results show that sensors number and location play a primary role in the accuracy of the reconstruction, whereby the choice of the modal basis has a negligible influence on the results.
Highlights
The evaluation of stress distribution over complex structures, as well as its overall evolution in time is of major interest in many engineering fields
Much effort is being dedicated to the development of Structural Health Monitoring (SHM) techniques to serve for this purpose
Final objective of this study is to assess the reliability of the SHM presented in [8,9] to variations of sensors number, location, and modal basis utilized for the reconstruction
Summary
The evaluation of stress distribution over complex structures, as well as its overall evolution in time is of major interest in many engineering fields. The SHM method proposed in [8,9] suggests using a low number of local strain measurements to reconstruct the overall deflection and distributed strain field over an entire structure. Objective of this work is assessing the capability of such SHM methodology to correctly reconstruct the distributed deflection and strain fields and give indications on the optimal location and number of FBG (or strain sensors in general). We assess the capability of the reconstruction methodology to correctly predict the structural deflection and strain fields as a function of number of sensors. Within this analysis, we assume to perfectly know the effective mode shapes of the structure. We will study the effect of choosing a wrong set of mode shapes on the reconstruction algorithm
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