Experimental and numerical studies on multiple response optimization-based control using iterative techniques for magnetorheological damper-controlled structure

摘要

The field of semiactive control dampers for structural control has seen a significant advancement in recent years. However, the controllers proposed in recent years have been computationally inefficient, time consuming, and did not allow the designer the flexibility in overall structural control. Consequently, this study presents a sequence of numerical and experimental studies conducted to determine the efficiency and performance of proposed multiple response optimization (MRO)-based control with iterative technique, using magnetorheological (MR) dampers as a control device in mitigating the structural response. The prime objective of the MRO control strategy is selecting an optimal control gain, obtained by a trade-off between the gains corresponding to the local minima of structural responses, selected as the performance objective of the controllers. The proposed strategy is numerically compared with H-2/LQG with clipped optimal control (COC). Results indicated the efficiency and flexibility of the proposed strategy in mitigating the structural responses. Finally, multiple shake table tests were performed on a five-story steel frame with MR damper, employing the control strategies to be examined. The corresponding results substantiated the superiority of MRO control over passive control strategies, in mitigating the structural responses.