Proceedings of The 2nd International Conference on Innovative Research in Science Engineering and Technology
Influence of Damping On Understeer Gradient Using Simulation and Measurement
Pornporm Boonporm and Narawith Phitchart
Safety one of the important criteria for assessment of vehicle suspension when cornering. For this reason, we studied the relationship of handling behaviour in term of tire deflection, which is one index for evaluating how good of the road holding. The quarter car suspension model is derived and used together with the kinematics measurement data. The testing results in form of suspension deflection are calculated from the sprung mass displacement, body roll and pitch, then those parameters are adjusted to be fit. After that, the lateral kinematics model is applied for an objective assessment of cornering manner. The experiment conducted by varying the damping constant. The excited frequency as well as vehicle speed is in the range of sprung mass mode natural frequency. The results are in accordance with the theory that the vehicle has the understeer behaviour.
Keywords: vehicle safety, tire deflection, kinematics measurement, understeer gradient.