Journal of Vibration and Sound

Journal of Vibration and Sound

Predictive Control of the Milad Tower Using a Semi-Active Tuned Mass Damper (SATMD) Integrated with Magnetorheological Dampers

Document Type : research article

Authors
Sina Jafarpour
Seyed Mehdi Zahrai
School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
Abstract
In this study, the seismic performance of the Milad Tower equipped with a semi-active tuned mass damper (TMD) was evaluated under scaled earthquake records and compared with two other cases: uncontrolled and passive TMD systems. For a more comprehensive assessment, eight performance indices, including peak values and root mean square (RMS) responses, were utilized. The earthquake records were scaled using a wavelet-based spectral matching method to accurately represent the seismic energy content within the critical period ranges of the structure, enabling a more realistic dynamic analysis. In the semi-active system, a magnetorheological (MR) fluid damper was employed as the damping element within the TMD. To model the nonlinear behavior of these dampers, artificial neural networks (ANNs) were used, offering faster response prediction compared to traditional parametric models. Additionally, a model predictive controller (MPC) was implemented to regulate the damping force of the MR dampers. By forecasting the structural response in future time steps, this algorithm enabled rapid and targeted reactions to seismic excitations. Numerical results demonstrated the effectiveness of the proposed semi-active system in reducing the seismic responses of the tower. Specifically, RMS values of displacement, velocity, and inter-story drift were reduced by approximately 30% compared to the uncontrolled case, while the passive system achieved around 15% reduction. RMS acceleration also decreased by more than 15% in the semi-active case, whereas the passive system showed only about 3% reduction. These findings highlight the potential of combining predictive control with variable damping to enhance the seismic resilience of tall structures.
Keywords
Telecommunication Structures'
Magnetorheological Dampers'
Tuned Mass Damper (TMD)'
Wavelet-Based Spectral Matching'
'
Model Predictive Controller (MPC)'
Subjects
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