Effect of Vehicle Vibrations on the Driver Comfort: Half Car and Driver Model

In this study, the effects of vehicle vibrations on driver comfort are examined in terms of the magnitude of the vibration transmitted to the internal organs. For this purpose, a half car model was created with the vehicle seat and the driver with the internal organs. While the vehicle and its seat have 5 degrees of freedom, the driver is modeled as 4 degrees of freedom, and as a result, a system with a total of 9 degrees of freedom has been modeled. The bumps used as speed regulators on the roads are accepted as vibration input to the system while writing the equations of motion. Simulations were performed for different vehicle speeds and different bumper dimensions to evaluate the vibrations transmitted to the driver's head, internal organs and the driver's seat. When assessing the magnitudes of the vibrations transmitted to the internal organs, the root mean square is used. In the literature, suspension and driver seat designs take the criterion of reducing the vibration transmitted to the driver's seat, while few are based on the acceleration of the vibration transmitted to the driver's head. In this study, it is proposed to take into account the root mean square value of the vibration transmitted to both the head and internal organs of the driver in suspension, seat and bump designs.