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PROCEEDINGS OF THE TENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Signal Processing and Predictive Control of a Semi-Active Structural Control System
M.-H. Shih+ and W.-P. Sung*
+Department of Construction Engineering, National Kaoshiang First University of Science and Technology, Kaoshiang, Taiwan
M.-H. Shih, W.-P. Sung, "Signal Processing and Predictive Control of a Semi-Active Structural Control System", in B.H.V. Topping, (Editor), "Proceedings of the Tenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 207, 2005. doi:10.4203/ccp.81.207
Keywords: predictive control, noise reduction, time delay, time compensate.
The theories and applications on structural control were proved with excellent effect on energy dissipation by experiments. The active and semi-active controls [1,2,3] depend on the response of system vibration, which requires a core unit to control and create signals. They precisely organize the sequence of signals as a query of the dynamic response of the structure and properly change over active or semi-active components according to the response data. Thus, the quality of the signals is definitely responsible for the success of the control system. Recently, the optimal prediction theory [4,5,6,7,8] and Kalman filter [9,10,11] have provided a signal-processing methodology to anticipate the response of structures. However, noises may occur while accessing and transporting the signals, it will be the key to failure or success of a control system.
Therefore, the predictive control and signal noise reduction technology is proposed in this research based on the direction of structural motions. A velocity prediction is developed by the least-square polynomial regression. This methodology is appropriate for the semi-active damper system. It decides the optimal switch point of control elements based on the current and past reaction data of the structural response under the excitation of external forces. Comparing with experimental data, the velocity detector (or predictor) is available to detect when to activate or switch the semi-active damper. It can detect when the structure motion reverses the direction as well as eliminates the poor influence on the semi-active damper caused by the compensated time delay. Meanwhile, the noise of displacement signal will not affect the phase difference of the predictive signal.
This proposed technology is appropriate for the control system with the following characteristics: (1) noises in measured signals, (2) control forces that are not continuous, (3) when the structure and control system are not linear, and (4) when the exact signal phase is required to precisely query the switching moment.
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