ABSTRACT
With the rapid development of modern high-rise buildings, more and more attention is paid to the wind-induced vibration problem, and effective control strategies are directly related to comfort and safety. Wind load process will be the primary issue to be addressed while studying the wind-induced vibration; in order to simulate the random wind load accurately and quickly, scholars have conducted much research on simulation methods. These are generally divided into two types; one is based on linear regression filtering technique, such as Auto Regressive (AR) method [1-2], Auto Regressive Moving Average (ARMA) method [3-4]; the other is harmonic synthesis method, which is based on trigonometric series superposition (WAWS); the former has a small amount of calculation but poor accuracy; in contrast, the latter can produce high-precision analog results, which can be unconditionally stable, for example [5], and achieves the simulation of random speed field by WAWS, and on this basis, further structural response is computed. In recent years, much research on further improving WAWS is expanded constantly to enhance its efficiency; YANG [6] applied the Fast Fourier Transform
(FFT) technique into theWAWS for the first time, and this can significantly improve the efficiency of harmonic terms’ superposition; for further improving the optimization efficiency of FFT, SUN [7] introduced the Decimation In Time (DIT) strategy (a technique in the field of signal processing); to accelerate the superposition, an efficient method without losing accuracy was generated.
