Nonlinear Shock Absorber Dynamic Analysis of Vehicle Suspension System Using Performance Indices

In this study, the behaviors of nonlinear shock absorber for both rebound and compression configurations are investigated for use on vehicles under a rounded road disturbance. The dynamic behavior of automotive suspension system is analyzed using a quarter-car model taking into account the nonlinearity of compression and rebound phases. Modeling and simulations are performed including the variation of the severity parameter and the performance metrics, such as ride comfort, suspension working space, and road holding, are evaluated using Root Mean Square (RMS) method for both nonlinear asymmetric and symmetric dampers. The performance indices are used to show the efficacy of the asymmetrical shock absorber systems. The comparative analysis exhibits that the asymmetrical shock absorber system with nonlinear characteristics provides a smoother and more progressive dynamic response. The implementation of an asymmetrical configuration demonstrates that it can improve highly the dynamic attenuation of the automotive shock absorber. Since lower acceleration levels are directly associated with improved ride comfort, the adoption of asymmetrical damping systems for vibration and impact attenuation represents a more effective solution for passenger vehicle applications.