Dynamic Characteristics Analysis of a Novel Displacement-Sensitive Anti-pitch Hydraulically Interconnected Suspension and the Corresponding Full Car

Background Hydraulically interconnected suspension (HIS) system has drawn wide attention in vibration control fields. The pressure difference problem due to long time use of HIS system will cause unsafe driving of the entire vehicle. Purpose To solve the pressure difference problem and improve the anti-pitch and ride comfort performance of the HIS system, the displacement-sensitive grooves are added to the oil cylinder wall of the HIS system. The displacement-sensitive HIS (DSHIS) system has different damping characteristics depending on the position of the piston. Methods The DSHIS system and a seven-DOF vehicle are modeled to lay a foundation for the simulation analysis. Then, the damping characteristics of the displacement-sensitive cylinder are studied. Next, the influence of the parameters on the DSHIS system’s performance is studied. Finally, a full car simulation is performed to compare the performance of the proposed DSHIS system to the original suspension and the HIS system. Results In the brake simulation, the pitch angles of vehicle 3 and vehicle 2 are reduced by 56% and 62.3% compared with that of vehicle 1, respectively. In the random road simulation, the acceleration RMS values of vehicle 3 and vehicle 2 are decreased by 48.17% and 26.73% than the original suspension, respectively. In the loading shock simulation, the maximum suspension deflection of vehicle 3 is decreased by 17.39% and 3.37% than vehicle 1 and vehicle 2, respectively. The maximum dynamic tire load of the vehicle 3 is decreased by 4.35% and 1.32% than vehicle 1 and vehicle 2, respectively. Conclusion The full vehicle simulations prove that the proposed DSHIS system can effectively improve the ride comfort and anti-pitch performance of the mining vehicle. Besides, the pressure difference problem can also be solved by the additional grooves on the cylinder wall.