Research Article
Apr 1979
Efficient FFT Simulation of Digital Time Sequences
Publication: Journal of the Engineering Mechanics Division
Volume 105, Issue 2
Abstract
A stacked inverse finite Fourier transform (FFT) algorithm is presented that will efficiently synthesize a discrete random time sequence of N values from only N/2 complex values having a desired known spectral representation. This stacked inverse FFT algorithm is compatible with the synthesis of discrete random time sequences that are used with the more desirable periodic-random type of dynamic testing systems used to compute complex-valued transfer functions by the frequency-sweep method. An application to the generation of large random surface gravity waves by a hinged wavemaker in a large-scale wave flume demonstrates excellent agreement between the desired theoretical spectral representation and the smoothed, measured spectral representation for two types of two-parameter theoretical spectra as a result of the lengthier realization made possible by the stacked FFT algorithm.
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Published In
Journal of the Engineering Mechanics Division
Volume 105 • Issue 2 • April 1979
Pages: 223 - 235
Copyright
© 1979 American Society of Civil Engineers.
History
Published in print: Apr 1979
Published online: Feb 3, 2021
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Robert T. Hudspeth, M.ASCE
Asst. Prof., Dept. of Civ. Engrg., Oregon State Univ., Corvallis, Oreg.
Leon E. Borgman, M.ASCE
Prof., Depts. of Geology and Statistics, Univ. of Wyoming, Laramie, Wyo.
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.