Abstract

Much research has been done on the behavior of pneumatic tires and this has resulted in many different tire models and measurement data. However, not much data is available in the specific area of the effect of the capply layer on the stability of the vehicle. In this research, the effect of the length of the capply layer on the longitudinal and lateral stiffness was investigated. Also, two models of the suspension system were simulated and their important parameters were calculated, including the displacement of the sprung mass, the displacement of the unsprung mass, and the tilt angle. In the next step of the simulation, using the CARSIM software, the effect of the length of the capply layer on the stability of the car was investigated. The results show that the number of lateral stiffness increases with the increase of the capply layer. By increasing the length of the capply layer of the tire, the layers that have a great effect on the longitudinal stiffness of the tire are reduced. By applying a step input with a range of 10 mm to the system, the maximum initial peak is observed in the length of the 6 mm capplay layer and the minimum peak is observed in the 16 mm capplay layer. The maximum tilting angle in this system is equal to 0.006 rad, which is considered a small value for the system. With the increase in the length of the capply layer, the ride quality of the car decreases. An increase of one millimeter in the capply layer can increase the stability of the car by 18 %.