Fluid Dynamics and Behavior of Nonlinear Viscous Fluid Dampers
Publication: Journal of Structural Engineering
Volume 134, Issue 1
Abstract
Fluid dynamics in viscous fluid dampers with annular orifices was analyzed by solving the Navier–Stokes equations. The shear-thinning effect and viscoelastic behavior of silicone oil, which is often used in a viscous fluid damper, were both considered. When the solutions were compared to experimental data, it was found that both the nonlinear viscous and the restoring-force behaviors of viscous dampers can be captured. To verify the effects of fluid inertia, finite-element analysis of the fluid dynamics in the damper tested was also performed, assuming the damper was filled with a Newtonian fluid. It was found that the inertial force is not important in an annular-orificed damper moving at . The effect of fluid compression in a fluid damper was also discussed. The proposed equations were used to calculate the restoring forces in the annular-orificed damper. It was found that the results give a close restoring force-displacement relationship as the one given by FEMA 273.
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Acknowledgments
The writer would like to express thanks to Diwan College for funding this research project. The National Center for High-Performance Computation of Taiwan, R. O. China is acknowledged for providing the computational facilities. Professor Deh-Shiu Hsu of National Cheng Kung University, Taiwan, R. O. China, is also acknowledged for providing the damper test details and data.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 1 • January 2008
Pages: 56 - 63
Copyright
© 2008 ASCE.
History
Received: Dec 23, 2004
Accepted: Nov 7, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
Notes
Note. Associate Editor: Michael D. Symans
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