Optimization of the Gestamp R&D dynamic simulation model

Sammanfattning: In 2006, a dynamic vehicle model with spinning wheels was developed by
master student Petrus Esberg. Since then, the Gestamp R&D team at Gestamp
Hardtech have found some possible improvements in order to have a more
physical and realistic model. The first part of the work consists of
investigating the existing model, suggesting and implementing improvements.
Improvements are mainly focused on the tire model and its properties. The
effects of the changes are measured by comparing the dynamic behaviour of
the vehicle model, before and after the improvements.
DYNSYS is a research project within modelling of low speed collisions,
developed at division of Solid Mechanics at Luleå University of Technology.
The project is presented briefly, especially the 1-dimensional model which
is implemented into the Gestamp R&D environement. The aim of the DYNSYS
project is to improve the correlation between simulations and reality for a
crash. The 1-dimensional DYNSYS setup has been implemented on a dynamic
vehicle model. Simulations are compared to real crash test results, effects
of including the 1-dimensional DYNSYS model in the dynamic vehicle model is
also studied.
Results show that the new dynamic vehicle model provides some improvements
e.g. the model permits crashing immediately without any time for
stabilization of the suspension system at equilibrium. By including the
DYNSYS 1-dimensional model, the absorbed energy and the intrusion are
reduced and closer to the experimental values than the values obtained with
the rigid model.