Improving the negative stiffness structure model of driver's seat suspension by using the roller springs
Based on the model of the negative stiffness structure using the horizontal springs (NSS-HS) added into the driver's seat suspension, a new design of the NSS using the roller springs (NSS-RS) is proposed to further improve the driver's ride comfort. To evaluate the isolation performance of the NSS-HS and NSS-RS, the dynamic models of the driver's seat suspension added by the NSS-HS and NSS-RS are established and simulated under various working conditions of vehicles. The isolation performance of the NSS-HS and NSS-RS in improving the ride comfort are then evaluated via the objective functions of the Root-Mean-Square of the displacement (zws) and acceleration (aws) of the driver's seat. The results show that the driver's seat seat suspension added by the NSS greatly improves the driver's ride comfort compared to the driver's seat suspension without the NSS under different operating conditions. In addition, with the new design of the NSS-RS, the driver's ride comfort is better than the NSS-HS under the various simulation conditions. Particularly, the zws and aws with the NSS-RS are significantly decreased by 12.7% and 16.4% in comparison with the NSS-HS under the excitation of the random road surface. Therefore, the application of the NSS-RS can further improve the ride comfort of vehicles.