COUPLED IMPEDANCE FOR POWER TRANSMISSION CHARACTERISATION IN MULTI-POINT-CONNECTED STRUCTURES

The placement and number of sensors is a crucial issue in experimental modal analysis. This is particularly true when large structures such as civil structures are under investigation, resulting in difficult and uncomfortable experimental set-up, large number of sensors, long cables and expensive equipment for data acquisition. In this work we present a methodology for time–space superposition of data acquired during dynamical tests of large structures. The technique allows the correlation of measurements collected at different times and in different spatial configurations, requiring that only one single acquisition point is kept spatially fixed. This makes possible to perform modal testing using undersized equipment and to include new test-data collected at different times and spatial distributions at a later stage. A case study, concerning experimental tests performed on an ancient building, is shown. The results have been validated experimentally and numerically using finite element analysis.