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Keywords: fast Fourier transforms
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Journal Articles
Article Type: Technical Briefs
J. Vib. Acoust. December 2011, 133(6): 064505.
Published Online: November 28, 2011
... 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...
Journal Articles
Article Type: Research Papers
J. Vib. Acoust. October 2008, 130(5): 051002.
Published Online: August 12, 2008
... 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...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. April 2007, 129(2): 169–178.
Published Online: September 19, 2006
... and stationary components. 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...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. June 2005, 127(3): 262–272.
Published Online: June 1, 2005
... 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...
Journal Articles
Article Type: Technical Briefs
J. Vib. Acoust. December 2005, 127(6): 604–607.
Published Online: December 13, 2004
...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...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. August 2005, 127(4): 351–361.
Published Online: November 30, 2004
...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...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. April 2003, 125(2): 205–213.
Published Online: April 1, 2003
... 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...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. October 2002, 124(4): 502–511.
Published Online: September 20, 2002
... 01 May 2002 20 09 2002 tracking adaptive systems recursive estimation least squares approximations vibrations rotation machine testing fast Fourier transforms band-pass filters Rotating machinery represents an important class of mechanical systems. For example...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. July 2001, 123(3): 303–310.
Published Online: March 1, 2001
... 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...
Journal Articles
Article Type: Technical Papers
J. Vib. Acoust. July 2000, 122(3): 263–271.
Published Online: February 1, 2000
... of the layered structures in calculating transfer functions. The numerical simulations are based on the Fast Fourier Transform algorithm. Various sampling rates from 10 5 to 10 7 are used for required resolution in order to obtain physically sensible results. In some cases, a damping...