The influence of damper properties on vehicle dynamic behavior 2000-05-0231
The detailed, dynamic properties of dampers are known to
influence substantially some of the subtle - and yet nevertheless
hugely important - refinement aspects or ride and handling. Despite
this, most of the current work on damping characterization relies
on steady-state properties and transient aspects are left largely
to subjective in-car assessments by test drivers.
The paper describes research work aimed at improving our
understanding of the transient properties of dampers through
mathematical modeling and then attempting to link these properties
to detailed aspects of the vehicle ride and handling. Further
experimental work is planned to follow later.
From a moderately complex mathematical model of a damper, an
attempt is made to identify (a) those transient characteristics
which are important in influencing the vehicle responses perceived
by test drivers, and (b) which design features of the damper
control those characteristics. Of particular interest to, for
example, ride vibration are the effects of the damper dynamics on
harshness associated with the mid/high frequency range. Also, in
relation to handling, the role of the damper in controlling
tautness in response to handling maneuvers is critical to the
subjective feel of the vehicle.
The damper model is finally combined with a mathematical model
of the whole vehicle in an attempt to quantify the role of the
damper''s transient properties in the vehicle.