Abstract
An active optimal control scheme is presented for the control of the galloping related vibrations in the long span bridge tower. The Kalman filter technique has been used for the state variable estimation. The Kalman filter approach includes the effect of gust loading in the control algorithm by considering the statistical properties of the wind loading, resulting in a superior control algorithm than the one presented previously with an optimal observer. A dual Active Tuned Mass Damping (ATMD) system is suggested for the control of a bimodal galloping phenomenon due to the simultaneous galloping of the two closely spaced vibration modes. A comparative study is also carried out to observe the effectiveness of an Active Tuned Mass Damper over that of a Passive Tuned Mass Damper with the changing mass ratio of the TMD.
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