Sampled Data Feedback-Feedforward Control of Structures with Time Delays
Publication: Journal of Structural Engineering
Volume 132, Issue 7
Abstract
A sampled data control algorithm taking into account external excitations was developed for structural engineering applications. The structure was modeled as a continuous system controlled by a digital control system. In addition to the feedback gain obtained using a conventional control design method, a linear feedforward gain was proposed to improve control efficiency. In order to ensure a satisfactory control performance, an adaptive scheme was developed to adjust this feedforward gain in real time according to the measurement history. The conventional sampled data linear quadratic regulator design was used as a baseline to evaluate the effectiveness of the proposed control algorithm. Some practical issues such as the effects of sampling frequency, time delay and actuator dynamics were addressed. This method was validated on the examples of two multistory shear beam lumped mass models. The numerical examples show that combining both the feedforward and feedback terms can improve the control efficiency significantly as compared to the case with feedback control only. It is also shown that the improvement on the control efficiency obtained with the proposed method is still noticeable when time delay is considered and compensated properly.
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Acknowledgments
This study was sponsored by National Science Foundation through Grant No. NSFCMS 9909247. Dr S. C. Liu is the Program Director. His guidance and advice are appreciated.
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Information
Published In
Journal of Structural Engineering
Volume 132 • Issue 7 • July 2006
Pages: 1129 - 1138
Copyright
© 2006 ASCE.
History
Received: Aug 5, 2004
Accepted: Aug 30, 2005
Published online: Jul 1, 2006
Published in print: Jul 2006
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