A Novel Semiactive Variable Stiffness Device and Its Application in a New Semiactive Tuned Vibration Absorber
Publication: Journal of Engineering Mechanics
Volume 137, Issue 6
Abstract
An innovative design for a semiactive variable stiffness (SAVS) device is presented in this paper. This beamlike device is capable of altering its stiffness in a smooth manner between minimum and maximum levels by using the variations of moment of inertia of an area as it rotates around a normal axis passing through its centroid. Analytical expressions for the stiffness of the proposed device have been derived. As an application of the SAVS device in engineering, a semiactive tuned vibration absorber (SATVA) is developed that is capable of real-time retuning and operates effectively in broadband frequency excitations. A single-degree-of-freedom (SDOF) system coupled with the SATVA is considered. The excitation force is assumed to arise from a rotating unbalance whose frequency varies with a constant acceleration and then reaches a steady-state operating condition. The absorber stiffness is varied to tune the absorber’s natural frequency to the forcing frequency in real time. The effectiveness of SATVA is evaluated by comparing the system’s responses with those of the system with passive vibration absorber. The results show the salient features of the proposed SATVA in transient response reduction compared with the traditional passive vibration absorber.
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Acknowledgments
The first author would like to acknowledge the scholarship awarded to him by the University of Tehran and Ministry of Science, Research, and Technology of Iran. The authors are thankful to their student, Mr. R. Mohammadi-Ghazi, for drawing Fig. 7(b).
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Published In
Journal of Engineering Mechanics
Volume 137 • Issue 6 • June 2011
Pages: 390 - 399
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 8, 2009
Accepted: Nov 15, 2010
Published online: May 16, 2011
Published in print: Jun 1, 2011
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