We present a bond graph analysis of a three-damper suspension system in a transverse half-car model. This is compared against the conventional two-damper system used in most commercial and racing vehicles. The transverse third damper system pioneered by the Koenigsegg Triplex suspension system is an innovative design said to improve straight-line tire contact during single-sided disturbance and help mitigate the adverse effects of squat and dive, while not inhibiting the function of the anti-roll bar’s lateral load transfer in cornering capability. No published literature exists exploring a transverse half-car model with effects of a third damper. We focused specifically on mathematical modeling of energy element relationships exploring vehicle dynamics frequency response behavior compared between transverse half-car models with and without the third damper. Calculated transfer functions explore first-order time derivative relationships of wheel-mass velocity to the harmonic input velocity of the road surface. The mathematical model demonstrated some ranges of resonance within typical driving and racing frequencies. Implementing the model to a Formula SAE race car, we explored the effects of manipulating spring stiffness, anti-roll bar stiffness, damping ratio, and mass in both two- and three-damper systems. Ultimately, it was observed that the addition of the third damper resulted in objective improvements in vehicle dynamics, shown by a reduction in amplitude ratio of both the left and right wheels compared to a conventional system. Interestingly, the left wheel (input side) experienced a greater reduction in amplitude ratio when it was hypothesized that the right wheel would be more affected.

This content is only available via PDF.
You do not currently have access to this content.