Vehicle ride control using human body dynamic simulation

The aim of this study was Vehicle ride control using human body dynamic simulation. When designing suspension system in ordinary sedans, we cannot only consider comfort and stability criteria. In these occasions, according to the working class of the vehicle, criteria of comfort and stability together and with a certain proportion will intervene in the designing suspension system. Principally, in such occasions, we lose the benefits of mentioned criteria due to relative consideration of the other criterion. What has been investigated in this research is the design of a controller that decreases acceleration caused by vibrations transmitted to the human body and also lowers the displacement of the tire with respect to the road. The proposed model for the body is a model with four degrees of freedom and the proposed model for the vehicle is a model with seven degrees of freedom. The proposed controller is an optimal-fuzzy controller that optimal controller and fuzzy one have been used for the design of state feedback and the change in the weighting functions of optimal controller, respectively. To confirm the strength of the designed controller, the various inputs of the actual road with varying vehicle speed have been applied to the model. The obtained results show that this controller has a major influence on deceleration transferred to the body and also in critical situations results in reduction in the displacement of the tire with respective to the road input.