基于演化相位谱的脉动风速模拟

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (9) : 163-168.

论文

基于演化相位谱的脉动风速模拟

阎启1; 李杰1，2

作者信息 +

Evolutionary-phase-spectrum based simulation of fluctuating wind speed

YAN Qi1; LI Jie1,2

Author information +

文章历史 +

摘要

基于理性分析，提出了一种演化相位谱模型，并由此发展了脉动风速模拟方法。根据湍流中不同频率涡旋的特征速度，提出了相位演化速度这一概念；进而，说明具体的风速时程可由所有初始相位为零的涡旋经过时间演化而来。通过对实测脉动风速值的识别和统计，给出了的概率分布。据此，可以得到演化相位谱的样本，结合Fourier幅值谱，应用逆Fourier变换便可进行脉动风速模拟。本文所建立的演化相位谱模型是对Fourier相位谱的一种理性描述，可用于各种结构抗风计算及可靠度分析的风荷载模拟当中。

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.