ABSTRACT
When designing forced vibration tests, engineers must choose the performances of structural health monitoring (SHM) systems, such as sampling frequency and duration of the acquisition, which influence the accuracy of the modal parameters extracted from SHM data. However, this choice must be taken a priori before installing sensors and having any measurements available. In this paper, we propose an approach for forced vibration tests design that provides the expected uncertainty of modal parameters to be extracted from SHM data before performing the test (i.e., a pre-posteriori). Then, we present an experimental campaign of forced vibration tests on a small-scale structure monitored by an SHM system. We repeated the tests by changing the performances of the SHM system to investigate the sensitivity of the modal parameters’ accuracy to SHM system performances. The results suggest that the pre-posterior approach provides the expected uncertainties of modal parameters which are in line with those extracted experimentally.
