斜拉索-磁流变阻尼器系统的频域自适应控制
Adaptive frequency-domain control for stay cable-MR damper system

基于频域LQG控制与Hilbert-Huang变换（HHT）,并考虑磁流变(MR)阻尼器动力学，提出斜拉索振动的频域自适应控制方法.由HHT识别受控拉索的瞬时状态，自适应调节控制器，提高目标特征频率的追踪能力，且避免时域LQG控制需要对权参数进行试算选取的问题.为验证所提出的自适应频域LQG(iAFLQG)控制算法的有效性，通过与MR被动控制及时域LQG半主动控制相比较，结果表明：iAFLQG控制能够更高效地利用MR阻尼器的动力特性达到最佳的拉索减振效果。
An adaptive control solution to suppress cable vibrations is proposed by synthesizing a frequency-shaped linear quadratic Gaussian (LQG) control with the Hilbert-Huang transform (HHT) technique and considering the magnetorheological (MR) damper dynamics. Based on the transient structural state identified by HHT, adaptive tuning of controller is accomplished to enhance its frequency targeting capability, which also eschews the a priori trial and error on the weight selection usually conducted in the time-domain LQG control. The proposed inverse dynamics based adaptive frequency-domain LQG (iAFLQG) control stategy is numerically verified in comparison with the passive MR damping and the time-domain LQG control, which demonstrates that the iAFLQG control exploits the intrinsic features of the MR damper in a more efficient way to substantially reduce the cable response