n all vehicle suspension, there is a dry friction. One of the various active suspensions, which have been shown to have considerable practical potential, is a switchable damper suspension system. In this paper, vehicle ride comfort for thepassive and switchable damper suspension systems as affected by the value of frictional force generated in springs isdiscussed. A mathematical model of a quarter vehicle model for two setting switchable damper suspension system with dryfriction force is developed to evaluate vehicle ride comfort in terms of suspension performance criteria. The vehicle itself istreated as a rigid body undergoing vertical motions. Comparisons between passive and switchable damper suspensions systemswith dry friction force in terms of ride performance are also discussed. The results showed that the ride comfort for the passiveand switchable damper suspension systems was deteriorated due to dry friction occurring in the suspensions. The two setting switchable damper with and without dry friction force gives better ride improvements compared with the passive suspension system. Also, the obtained results show an optimum value of damping ratio of the passive suspension system |
