Closed-Open-Loop Optimal Control of Building Structures Subjected to Exponentially Attenuating Harmonic Loading
In the past two decades researchers in structural control community were mainly focused on the development of closed-loop control strategies since dynamic loads exerted on structures such as earthquakes are not known in prioror. In this paper, a closed-open-loop control algorithm is introduced by monitoring the dynamic loads in real time. An estimator is used to predict the parameters of load model. As a pilot study, only exponentially-attenuating dynamic loads are considered herein. The feed forward gain factor is derived and its sensitivity to the parameters in external loads is studied. An illustrative single-story building is used to demonstrate the prosand cons of the new algorithm. Analytical results show that the algorithm is significantly superior to the closed-loop control in reducing the dynamic responses of a structure when subjected to an impulsive type of excitations such as blast and near-fault earthquake loads. The algorithm is also more efficient in use of external energy to suppress vibration in structures. Results of this study also indicate that the closed-loop control is effective to suppress the vibration level of structures when subjected to stationary disturbances.
G. Chen, "Closed-Open-Loop Optimal Control of Building Structures Subjected to Exponentially Attenuating Harmonic Loading," Proceedings of the 12th World Conference on Earthquake Engineering (2000, Auckland, New Zealand), National Information Centre of Earthquake Engineering (NICEE), Feb 2000.
12th World Conference on Earthquake Engineering (2000: Jan. 30-Feb. 4, Auckland, New Zealand)
Civil, Architectural and Environmental Engineering
Article - Conference proceedings
© 2000 National Information Centre of Earthquake Engineering (NICEE), All rights reserved.
01 Feb 2000