A study of the influence of vertical tyre force on rolling resistance coefficient and lateral slip stiffness coefficient using truck tyre model
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Typ
Projektarbete, avancerad nivå
Program
Publicerad
2021
Författare
Govardhan Raju, Bharath
Nobeling, Nicholas
Rajopadhye, Chirag
Tota, Pranay Damodhar
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Tyres are an important component that affect the energy consumption and performance
of all vehicles, including trucks. The vital properties of the tyre realising
these phenomena are the rolling resistance and lateral slip stiffness, respectively.
This project aims to investigate and understand the influence of vertical load on
the rolling resistance coefficient and lateral slip stiffness and based on these investigations,
evaluate the possibility of creating simple and physically interpretable yet
tune-able tyre models. The lateral slip stiffness investigation involves modelling a
physical tire model based on the brush model with parabolic pressure distribution
and a curve-fit model based on the ’openPBS’ tool non-linear tyre model. These
models are tuned to match the data extracted from the VTI experiments of test
performed with a truck tyre on the tyre testing facility. The lateral slip stiffness generated
using both models is compared with the experimental test data, and found
that the curve-fit model presents a better approximation of the test data. However,
dense measurement data in terms of more data sets for varying vertical loads as well
as more number of measured lateral force vs. slip points for each vertical load data
set will be required to confirm this conclusion. The variation of RRC with lifted and
non-lifted axles is studied using test data availed from a report by Lennart Cider,
discussing the rollout tests of two different trucks with lifted and non-lifted axles.
A proposition of load independent wheel bearing torque loss is considered as an
alternate explanation for the varying rolling resistance and a study conducted for
the same shows that the friction losses in the wheel bearings could approximately
account for around only 13.5% of the estimated change in rolling resistance. Hence
this cause solely is an unlikely explanation of the difference in rolling resistance. A
finite element study of the tyre contact patch and the vertical load offset could aid
the understanding of this phenomena better.
Beskrivning
Ämne/nyckelord
Truck tyre , tyre model , rolling resistance , slip stiffness , bearing loss