Modeling the stability of wheeled agricultural tractors

The knowledge of the stability limit of tractors is fundamental to the safety of the agricultural operations in order to avoid accidents. The objective of this research was to develop a mathematical model to predict the loss of tractor stability. The model was verified under dynamic conditions on a standardized track, with no implement attached to the tractor. In order to predict the loss of tractor stability, the mathematical model was implemented based on the tractor geometry and weight and on some information about the tractor placement on the track. Forces and momentum analyses were accomplished to determine the equations that describe the static and dynamic tractor behavior on sloping terrain. It was used a 4x2 tractor. Comparing the experimental to the model estimated tractor-overturning angle, it was concluded that the developed model is capable to predict the stability loss.