Development of Suspension System Model for Designing Anti-Roll Bar

Abstract

This thesis presents the development and validation of a comprehensive full-vehicle Adams Car model for the University of Waterloo Alternative Fuels Team LYRIQ. The primary objective of this research is to optimize the suspension system, particularly the anti-roll bar, to accommodate the increased weight and altered weight distribution resulting from the integration of an all-wheel-drive electric powertrain. The full-vehicle model facilitates a detailed analysis of the vehicle's dynamic behavior under various conditions, enabling rapid prototyping and evaluation of suspension parameters. Through rigorous simulation tests, including fishhook and double lane change maneuvers, the study identified key areas where the UWAFT LYRIQ exhibited higher body roll and reduced yaw rate responsiveness compared to the stock LYRIQ model. These findings underscored the necessity of optimizing the ARB stiffness to enhance the vehicle's dynamic performance. Adjustments to the ARB stiffness, achieved by shortening the moment arm, successfully reduced body roll, bringing it closer to the levels observed in the stock model. However, improvements in lateral acceleration and yaw rate were less pronounced, highlighting the significant role of overall vehicle weight in influencing agility and handling characteristics. The research provides valuable insights into the impact of increased vehicle weight and altered weight distribution on handling performance, emphasizing the importance of fine-tuning suspension components in electrified vehicles. Future work may focus on further optimization of suspension parameters and the exploration of advanced materials and technologies to enhance vehicle performance while maintaining safety and comfort. This study contributes significantly to the field of vehicle dynamics, particularly in the context of electric vehicle development, and lays the groundwork for ongoing advancements in this rapidly evolving domain.