Behavior and Road Handling of Tractor-Semi-Trailer Units: Improvement of Roll-Over Threshold 845059

The roll-over of the tractor-semi-trailer units is a spectacular road accident relatively specific to this type of vehicle, especially in obstacle avoidance maneuvers.
Different mathematical models were established to determine the transversal dynamics of the tractor-semi-trailer unit.
At the same time, dynamical tests on the road site permitted us to quantify the variables of interest, and to adapt the models.
We used these models to design modifications for the tractor and the semi-trailer in order to increase significantly the roll-over threshold.
One experimental tractor and one experimental semi-trailer with adjustable parts were built and tested on road site.
These experimental units are able to realise a transversal limit acceleration of 5 m/s2, this limit being 3.5m/s2 for the reference unit. On other criteria of road handling, the gain is sensible and very positively felt by drivers.


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