Multiple coherence method in time domain for the analysis of the transmission paths of noise and vibrations with non stationary signals

In this work we analyze the transmission paths of noise and vibration through the multiple coherence method. The non-stationariness of the signals in our applications motivates the introduction of the time variable. The analysis is performed using Fast Fourier transform-based techniques and auto-regressive modeling. These methods will be compared in terms of computational expenses and reliability. We illustrate their behavior computing the power spectral density and the coherence of synthetic and experimental stationary and nonstationary signals.