Optimization Of Damping Unit
Author(s)
J. Kolář & K. Adámek
Abstract
This paper reports the numerical investigation and optimization of a damping
unit where oil flow interacts with an elastic chocking plate. Chocking of flow
from a by-pass valve is the basic principle of hydraulic shock absorbers.
However, cavitation phenomenon caused by strong shocking occurs at high
frequencies of an actuating movement and the original damping unit
characteristic is being distorted. We used the computational fluid dynamic to
minimize the distortion of characteristic as much as possible. To satisfy the high
number of unsteady simulations, the involved fluid-structure interaction needs to
be coupled in a different way than the routine is. The plate deformation is
coupled with an average hydrodynamic loading pressure by a single aforecomputed
third polynomial equation being predicted by FEM. Numerical
simulations of flow by the use of FVM exploiting dynamic mesh in Fluent
commercial code then provides a flow field pattern and loading pressure within
the unit itself. A User Defined Function (UDF) enables the deformation of the
domain boundaries in a coupled way. Finally, the time dependency of the plate
position and its dynamic behaviour is obtained. Highly dynamic manners
appeared and numerous techniques providing a better stability of computations
had to be investigated and developed. The state where the most cavity bubbles
are being induced is further applied to shape optimization at the steady state.
The shape-based similarity optimization of by-pass geometry is then carried out
to minimize the formation of cavitation bubbles.
Keywords: damping unit, shape optimization, computational fluid dynamics,
chocking plate, cavitation, user defined functions, shape based similarity.
1 Introduction
The movement of a thin spring-steel plate induced by the impact of oil flow is an
example of fluid-structure interaction. This interaction can be found in many
engineering devices. The mentioned case is a typical one in the field of chocking
Keywords
damping unit, shape optimization, computational fluid dynamics,
chocking plate, cavitation, user defined functions, shape based similarity.
Related Book
Other papers in this volume
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