Investigation of the Effect of the Force-Frequency on the Behaviour of a New Viscous Damper for Railway Applications
Abstract
The primary purpose of this work is to experimentally investigate the damping
coefficient of a viscous damper, intended to be used in railway applications to reduce
noise emission. The viscous shock absorber used in this study is a commercial vehicle
damper to which minor modifications were added. This investigation was focused on
detecting the variation in the damping coefficient value over a wide range of frequencies.
The experimental setup tends to simulate the railway vibration represented by a strong
steel metal sheet structure attached to a shaker from its lower side. The shaker itself is
connected to the damper rod through a dual acceleration-force sensor. A sinusoidal load
with wide range of frequencies was applied by the shaker to the top of the damper's
rod. Both acceleration and force time-responses were collected, stored and analyzed to
extract the Force-Displacement and the Force-Velocity graphs. Based on the damping
coefficients obtained for the different values of excitation frequencies, the results show
that the damping coefficient is not constant and depends on the excitation frequency.
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