... other using the fast Fourier transform and the inverse fast Fourier transform. An efficient iterative algorithm is developed in this work to directly and accurately calculate the IRFs of SISO and MIMO systems in the time domain using relatively short input and output data series. The iterative algorithm...

... as the dimensionless frequency increases. When the dimensionless frequency is low, there are two critical speeds. One speed increases as the dimensionless frequency increases, while the other speed decreases as the dimensionless frequency decreases. Based on the fast Fourier transform, numerical methods are developed...

... vibrations electric machines time-frequency analysis fast Fourier transforms wavelet transforms splines (mathematics) Signals consisting of stationary components plus transients are encountered very often in practice. A typical example is the vibration signals generated in rotating machinery...

... parameters, subharmonic, quasi-periodic, and chaotic motions. The pad state space trajectory, in many cases, resembles that of the two-well potential case as in Duffing’s oscillator. Time trajectories, Poincare maps, fast Fourier transform (FFT) plots, and the max Lyapunov exponent are utilized to examine...

...S. Z. Peng A numerical technique, named the acoustical wave propagator technique, is introduced to describe the dynamic characteristics of one-dimensional structures with discontinuities. A scheme combining Chebyshev polynomial expansion and fast Fourier transforms is introduced in detail...

...D. F. Shi; L. S. Qu; N. N. Gindy Vibration monitoring and diagnosis of rotating machinery is an important part of a predictive maintenance program to reduce operating and maintenance costs. In order to improve the efficiency and accuracy of diagnosis, the general interpolated fast Fourier transform...

... vibrations eigenvalues and eigenfunctions fast Fourier transforms Experimental modal analysis seeks to identify the underlying modal structure of a linear mechanical system. The response of such a system has a set of undetermined parameters that must be found by a “best fit” of the assumed solution...

... are primarily based on Fourier analysis, where narrow-band spectra of the frequency-varying signals are calculated by using time-windowing approach 2 . Resampling is generally required in the Fast Fourier transform (FFT)-based methods to compromise between time and frequency resolution for various shaft speeds...

... Frequencies (BCF). Since BCF contain very little energy, and are usually overwhelmed by noise and higher levels of macro-structural vibrations, they are difficult to find in their frequency spectra when using the common technique of Fast Fourier Transforms (FFT). Therefore, Envelope Detection (ED) is always...

...; revised Feb. 2000. Associate Technical Editor: A. Vakakis. 01 Dec 1998 01 Feb 2000 thermoelasticity thermoacoustics acoustic wave propagation fast Fourier transforms inhomogeneous media The recent advances in photonics and laser instrumentation, such as pulsed laser, laser...