Handling Performance Analysis of Run-Flat and Standard Tires Using Pacejka Tire Model

Abstract

This thesis investigates the handling performance of standard pneumatic tires and self-supporting run-flat tires under deflation scenarios using a combined finite element and vehicle dynamics simulation approach. Finite element models of both tire types were developed in Abaqus to extract lateral force characteristics across slip angles (-4° to +4°) and inflation pressures (250 kPa, 130 kPa, and 0 kPa). The extracted data were fitted using the Pacejka Magic Formula, yielding peak lateral forces of up to 4162 N for inflated run-flat tires and 4769 N in the deflated state, compared to 3577 N and 4919 N for standard tires, respectively. These models were integrated into a double-track vehicle dynamics model with quasi-static lateral load transfer and a velocity-scaled path-following controller. Constant-radius turning maneuvers at 22 m/s were simulated with front-left tire deflation introduced at 13 seconds. Results showed that standard tires experienced over 10 meters of lateral deviation post-deflation, with saturated steering input, while run-flat tires limited deviation to under 0.5 meters and maintained control without reaching steering saturation. The study highlights the superior safety potential of run-flat tires under pressure-loss conditions and demonstrates the effectiveness of integrated finite element and empirical modelling in predicting vehicle handling performance during tire failure.