2134/14753
Georgios Mavros
Georgios
Mavros
A study on the influences of tyre lags and suspension damping on the instantaneous response of a vehicle
Loughborough University
2014
Transient handling
Tyre force lag
Suspension damping
Non-linear model
Mechanical Engineering
Engineering not elsewhere classified
2014-06-05 09:07:49
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/A_study_on_the_influences_of_tyre_lags_and_suspension_damping_on_the_instantaneous_response_of_a_vehicle/9225368
The paper aims to quantify the influences of non-steady state tyre behaviour and
suspension damping on the instantaneous response of a vehicle to handling manoeuvres. The
influences of such parameters cannot be determined using steady state tests. In the present
work, a recently developed methodology is employed, which has been applied in the past to
simple transient handling studies. Here, the approach is applied to more demanding situations
and the effects of tyre lags and suspension damping are directly related to the under-steer,
over-steer, or neutral-steer character of the vehicle under test. To distinguish between the
effects of tyre force lags, tyre non-linearities, and combined tyre–vehicle non-linearities, an
increasingly complex approach is adopted, which involves the implementation of a linear
bicycle model, a non-linear bicycle model, and a ten-degrees-of-freedom (10DOF) non-linear
vehicle model. In all cases, tyre-force lags are simulated using the relaxation length concept.
The 10DOF vehicle model is validated against experimental measurements and forms the basis
for fully non-linear studies. It is shown that even inherently under-steering vehicles may
initially over-steer as a result of the delayed response of tyres. Finally, it is demonstrated that
the proposed approach captures the effect of suspension damping and some problems are
discussed regarding its application.