Evolutionary-phase-spectrum based simulation of fluctuating wind speed

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (9) : 163-168.

论文

Evolutionary-phase-spectrum based simulation of fluctuating wind speed

YAN Qi1; LI Jie1,2

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Abstract

Based on rational analysis, an evolutionary -phase-spectrum model which can be used in fluctuating wind speed simulation is proposed. According to the characteristic speed of eddies with different frequencies in turbulence, the concept of phase-evolving speed is put forward. Afterwards, it is illustrated that real wind speed history could be regarded as the evolutionary results of eddies with initial phases of zero after a evolutionary time . The probability distribution of is presented through statistics of the identified value from measured fluctuating wind speed histories. Then, it is easy to get samples of evolutionary -phase-spectrum. Combined with Fourier amplitude spectrum, fluctuating wind speed could be obtained through inverse Fourier transform. The evolutionary -phase-spectrum model is a rational description of Fourier phase spectrum and is recommended to be used in wind load simulation in wind-resistance calculation and reliability analysis of structures.