Mimo System Structural Identification: a Revisit via Wavelet Transforms

This paper presents a method for the derermination of the frequency response functions using thefast wavelet transform (FWT) as an alternative to the fast Fourier transform (FFT)-based method. After a brief description of underlying theory, a focus problem is used to examine the relative perjonnance between the FFT-based vs. the FWT-based procedures for noisy data. The performance evaluations indicate that the FWT-based method consistently yields more accurate FRFs than possible by the FFT-based method, especially for the staticjlexibiliQ when the driving frequency asymptotically approaches to zero.