Analysis and Simulation of Meteorological Wind Fields Based on Wavelet Transform

Abstract:

In this work, we examined the non Gauss distribution characteristic and evolution law of the wavelet coefficient of a gust using wavelet transform; according to the time-frequency characteristic, the wavelet transform coefficients and the energy relations of the target velocity spectra are derived; the wavelet coefficient is generated using the cascade model reflecting the turbulent intermittent; the unsteady gust artificial generation method is established based on inverse wavelet transform; and the arbitrary unsteady fluctuation law can be generated by regulating the coefficient of low frequency. The results show that: the natural gust is in good agreement with Karman wind speed spectrum, meets the turbulence-5 / 3 law in the inertial subrange, and exhibits the nature of intermittence and local self-similarity; the artificial wind sequence based on the inverse wavelet transform method shows similar turbulence statistics with natural gust, with which, the effectiveness of the method is confirmed.

• Periodical: Applied Mechanics and Materials (Volumes 490-491)
• Pages: 1228-1236
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.490-491.1228
• Online since: January 2014
• Authors: Fo Rong Jin, Wei Rong Wang
• Keywords: Inverse Wavelet Transform Method, Meteorological Wind Field, Wavelet Transform (WT)

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