Wind-Induced Vibration Control Using Sliding Mode Fuzzy Control

Abstract

A sliding mode fuzzy control(SMFC) is applied to design a control for the third generation benchmark problem on a wind-excited building. A distinctive feature in vibration control of large civil infrastructure is the existence of large disturbances, such as wind, earthquake, and sea wave forces. Those disturbances govern the behavior of the structure, however, they cannot be precisely measured, especially for the case of wind-induced vibration control. Since the structural accelerations are measured only at a limited number of locations without the measurement of the wind forces, the structure of the conventional control may have the feed-back loop only. the general structure of the SMFC is composed of a compensation part and a convergent part. The compensation part prevents the system from diverging, and the convergent part makes the system converge to the sliding surface. The compensation part uses not only the structural response measurement but also the disturbance measurement, so the SMFC has a feed-back loop and a feed-forward loop. to realize the virtual feed-forward loop for the wind-induced vibration control, a disturbance estimation filter is introduced. The structure of the filter is constructed based on an auto regressive model for the measured structural responses and the stochastic information of the wind force. For the verification of the proposed algorithm, a numerical simulation is carried out on the benchmark problem of a wind-excited building. The results indicate that the present control algorithm is very efficient for reducing the wind-induced vibration.