2 - Temps-fréquence pour l'identification des caractéristiques dynamiques d'un pylône de téléphérique

Experiments have been carried out on hold-town towers of monocable ropeways . The main object of the study concerns th e validation of a theoretical model comparing calculated natural frequencies with estimated frequencies from measured signals . Non-stationarity of the signals has lead us to time-frequency methods . The comparison of results from different technics — spectrogram, gliding Capon and Lagunas, gliding AR, gliding ARCAP and LAGCAP — has converged to the suitable choice o f the hybrid time-frequency method, called ARCAP. This method joins up an AR estimation of the frequencies and a Capon estimatio n of the associated power. Afterwards, time-frequency results are read and compared to the results of numerical simulations comin g from the theoretical model .