振动控制研究中的小波包降噪处理

STUDY ON WAVELET-PACK DE-NOISING TREATMENT FOR VIBRATION CONTROL

在土木结构振动控制研究中,通常采用人工地震波或实测地震波进行输入,这些地震波往往受到椒盐噪声、脉冲噪声、高斯噪声等多种高频噪声的干扰,影响了振动控制研究的效果。提出一种小波包降噪的处理方法,用以降低高频噪声干扰和简化地震波有效特征向量提取。把实测地震波与降噪处理的地震波应用在一般结构主动控制理论研究中,运用LQR控制算法,通过编制计算机程序进行仿真分析。分析结果表明:地震波经降噪处理前后主动控制地震响应变化非常小,控制系统对于实测地震波的干扰成分具有良好的鲁棒性。

In structure vibration control research,the artificial earthquake wave and the actual earthquake wave are usually adopted,but they are often interfered by high frequency noise disturbance,such as,salt and pepper noise,impulse noise and Gauss noise.So the vibration control effect is affected.A kind of wavelet-pack de-noising treatment method is proposed so as to reduce the high frequency interference and simplify the extraction of the earthquake wave effective characteristic vector.The actual earthquake wave and the de-noised earthquake wave are applied to general active control with LQR control algorithm and the simulation analysis is performed.The results show that the change in the seismic response is extremely small either using the de-noised earthquake wave or using the actual earthquake wave and the control system has a better robustness to interference of the actual earthquake wave.