Behavior explanation and a new model for nonlinear viscous fluid dampers with a simple annular orifice |
| |
Authors: | Chien-Yuan Hou |
| |
Institution: | (1) Centre for Mechanics of Micro-systems, School of Mechanical & Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore;(2) School of Mechanical, Materials and Mechanics Engineering, University of Wollongong, Faculty of Engineering, NSW 2522, Australia |
| |
Abstract: | Viscous fluid dampers have been used in many building and bridge construction projects for earthquake damage mitigation. Previous
study has shown that silicone oil properties, such as the fluid shear-thinning and relaxation effects, play important roles
for the annular-orificed fluid damper behavior, and the Navier-Stokes equations based on these mechanisms were developed.
In the current study, attempts are made to explain the effects of frequency, damper dimensions, and viscosity of silicone
oil on the damper stiffness behavior using the developed equations. It is found that the developed equations successfully
explain the observed phenomena. To avoid the complicated fluid dynamics analyses for damper parameters, such as the damping
factor and the velocity power exponent, a new four-parameter equation considering both the fluid shear-thinning and stiffness
effects, with a form similar to the widely used two- or three-parameter equation is proposed. The results of the new model
successfully capture the damper behavior both at low and high frequencies and show an advantage that better consistent results
can be obtained in the velocity range for the building and bridge applications. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|