Page 21 - DOUCE HYDRO 2013

21
Preloaded Spring Dampers
GENERAL
FVD: FLUIDVISCOUS DAMPER
STU: SHOCK TRANSMISSION UNIT
PSD: PRELOAD SPRING DAMPER
AVE SERIES
PSD Series
Working Principle:
The PSD works on the principle that rapid flow of viscous
fluid through a narrow orifice or port, generates high
resistance, which then dissipates a large amount of energy.
The energy is dissipated in heat. In order to avoid the
displacement before reaching a certain force level, Douce-
Hydro/Jarret Structures can define a preloaded value, F0.
Before reaching this value it is not possible to compress
the unit. After the dynamic compression of the PSD, the
unit has the ability to return to its original position due
to the integrated spring function. For example, this return
force value is defined in order to overcome the friction
force of the sliding pot bearings. In order to generate this
damping and spring function in two directions, a double-
acting PSD is used.
BEHAVIOR LAW:
AT10S-2000E
Linkspan « Quai des Flotilles »
in France.
F = F0 + KX + CV α
Static
reaction
Dynamic
reaction