Optimal Design of Kinematic Characteristics for Rear Single-Trailing-Arm Suspension Based on NSGA-II

Owing to its structural features, the single-trailing-arm suspension tends to exhibit excessive wheelbase variation and caster angle variation during wheel travel. To address this issue, this study proposes an optimization method for the hard point parameters of the non-steering rear single-trailing-arm suspension. Firstly, a mathematical model and a dynamic model of the single-trailing-arm suspension are established separately. The validity of the mathematical model is verified by comparing simulation results, and the model is revised using a correction coefficient. Sensitivity analysis of the suspension hard points is performed via ADAMS/Insight to screen out key design variables. Finally, the NSGA-II multi-objective genetic algorithm is employed for optimization, followed by simulation validation. The results demonstrate that this method effectively enhances the kinematic characteristics of the suspension, providing theoretical support for the optimization of hard point layout.