抄録
A tower of a major suspension bridge under construction is subjected to vortex-induced vibration. Our purpose in this study is to suppress this vibration to an allowable level by active vibration control using μ synthesis. We use the bridge tower model with height of 4.6 m and weight of 370 kg as an example of this problem. When we design a μ controller, considering that the tower is complex in structure and under construction, we assume that the system has two types of uncertainty. One is the higher vibration mode uncertainty, and the other is the parametrized uncertainty which represents the variations of the system due to progress in construction. From the dosed loop properties and simulation results, compared to our previous μ controller which considers only the higher vibration modes uncertainty, our new μ controller is proved to maintain the stability and the performance against the progress in construction.
