Adaptive Compensation for Detuning in Pendulum Tuned Mass Dampers
Publication: Journal of Structural Engineering
Volume 137, Issue 2
Abstract
Detuning, resulting from deterioration, inadvertent changes to structure properties, and design forecasting, can lead to a significant loss of performance in tuned mass dampers (TMDs). To overcome this issue, an adaptive compensation mechanism for suspended pendulum TMDs is proposed. The adaptive pendulum mass damper is a three-dimensional pendulum, augmented with a tuning frame to adjust its natural frequency, and two adjustable air dampers adjust damping. The adjustments for the natural frequency and damping compensation are achieved using a system of stepper motors and a microcontroller. There are two major components in the proposed methodology: identification and control, one followed by the other, in that order. The identification is carried out using spectral information obtained from the structural acceleration responses. The performance of the adaptive pendulum system is studied via both experiments and simulations. The main contribution of this paper is to develop an effective means of compensation for detuning in TMDs, while retaining the simplicity of passive pendulum TMDs. The proposed methodology allows pendulum TMDs to be tuned in place using relatively simple hardware and algorithms, based on ambient vibration measurements only.
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Acknowledgments
The writers are grateful to the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Ontario Centers for Excellence (OCE) for providing the financial support to conduct this study. The writers also thank Greater Toronto Airports Authority (GTAA) and Rowan Williams Davies and Irwin (RWDI) who serve as the industrial partners in this collaborative project. Special thanks to Mr. Greg Thompson, Mr. Scott Gamble, Dr. Peter Irwin, and Mr. Trevor Haskett, all from RWDI, for providing valuable insights into the TMD installation procedures.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 137 • Issue 2 • February 2011
Pages: 242 - 251
Copyright
© 2011 ASCE.
History
Received: Feb 11, 2010
Accepted: Jul 23, 2010
Published online: Aug 2, 2010
Published in print: Feb 2011
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