Deployable Active Mass Dampers for Vibration Mitigation in Lightweight Bridges
Publication: Journal of Structural Engineering
Volume 143, Issue 12
Abstract
The use of lightweight materials in bridges has brought significant attention to the design and construction of control devices that can suppress excessive vibrations, especially to satisfy serviceability requirements. Control devices enable realization of structural designs for lightweight structures without a commensurate increase in the overall footprint or weight. Most current structural control devices are permanent installations of control systems, tuned to particular structural properties and hence specific to a particular application. This paper proposes a novel concept of a deployable active control device aimed at applications where short-term vibration mitigation during predictable events is desired. This deployable active control device consists of an electromechanical mass damper (EMD) mounted on an uncrewed ground vehicle (UGV) and does not rely on a rigid connection to the structure, thus facilitating rapid deployment for temporary applications. The controller consists of a linear quadratic Gaussian (LQG) algorithm in series with a model to compensate for UGV dynamics and a controller for the EMD. This paper introduces this concept for the first time, followed by the controller formulation including the identification of transfer-function models to capture the EMD and UGV dynamics. The performance of the models and overall control performance of the proposed system is studied through real-time hybrid simulation (RTHS) involving coupled numerical and experimental substructures. The experimental results confirm effective control is achieved using an EMD mounted on a UGV by compensating for UGV dynamics. This concept shows promising results where temporary control is desired, especially in lightweight bridge applications.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 8, 2016
Accepted: Jun 27, 2017
Published online: Sep 23, 2017
Published in print: Dec 1, 2017
Discussion open until: Feb 23, 2018
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