Wavelet-based modal analysis for time-variant systems
A new method for the analysis and identification of time-variant vibration systems is proposed. The method utilises the wavelet-based Frequency Response Function (FRF). Random impact excitation is used to obtain the wavelet-based FRF. Signal post-processing  based on ridge extraction and the crazy climbers Algorithm  is applied to identify modal parameters, i.e. natural frequencies, damping and mode shapes. The method captures the dynamics of the analysed simulated and experimental time-variant vibration systems. All modal parameters - and their evolution in time - are identified correctly.
modal analysis wavelet-based frequency response function vibration time-variant systems wavelet analysis system identification