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Hilbert transform methods for nonparametric identification of nonlinear time varying vibration systems

3 August, 2014

Author: Michael Feldman

Source: Mechanical Systems and Signal Processing (2014), 47(1-2), 66-77

Abstract: The objective of this paper is to demonstrate a Hilbert transform (HT) method for identification of mechanical time-varying vibration systems under free and forced vibration regimes. This special kind of non-stationarity arises in experimental vibration analysis and in engineering practice. The method is based on the HT of input/output signals in a time domain to extract instantaneous dynamic structure characteristics, such as natural frequencies, stiffness, damping, and their variations in time.