Development and Experimental Validation of a New Control Strategy Considering Device Dynamics for Large-Scale MR Dampers using Real-Time Hybrid Simulation

By Anthony Friedman1, Shirley Dyke1

1. Purdue University

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Abstract

As MR control devices increase in scale for use in real-world civil engineering applications, their dynamics become increasingly complicated. Control designs that are able to take these characteristics into account will be more effective in achieving good performance. A new control algorithm, ODCOC, which utilizes over- and back-driving current control to increase the efficacy of the control device, is proposed. To validate the performance of the new controller under general earthquake excitation and uncertain conditions, a series of three large-scale validation experiments (using large-scale 200kN MR Dampers and steel frames) are performed, including: (1) a three-story linear structure real-time hybrid simulation (RTHS), with a large-scale steel frame and MR damper as tbe physical substructure; (2) a nine-story linear structure real-time hybrid simulation, with a large-scale steel frame and MR damper(s) as the physical substructure; and (3) a non-linear nine-story structure numerical simulation analysis. The performance of the proposed controller is compared to several establish MR damper control methods in each experiment. Through these studies, RTHS is verified as a viable testing technique for large-scale applications, as comparisons to numerical simulations and repeatability testing demonstrate the reliability of this method, and the controller experiments demonstrate the improved structural performance that results when using the ODCOC algorithm compared to other established methods. Any projects, including both academic and professional engineering applications, that utilize devices at these scales will benefit from employing this control method. 

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Researchers should cite this work as follows:

  • Anthony Friedman; Shirley Dyke (2013), "Development and Experimental Validation of a New Control Strategy Considering Device Dynamics for Large-Scale MR Dampers using Real-Time Hybrid Simulation ," https://datacenterhub.org/resources/7022.

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