Contrastive Analysis Of Ride Comfort For A Truck Car With Mechanically And Hydraulically Interconnected Suspension

Ride comfort and handling stability are important performance requirements of vehicles,which are mainly determined by the structural parameters and installation forms of vehicle suspension.The traditional suspension is unable to fulfill the independent regulation of the bounce and pitch modes of the vehicle,it also incapable of adjusting the dynamic characteristics of the roll and warp modes independently.In order to solve above-mentioned problems,scholars and engineers from vehicular field have proposed a variety of solutions,in which interconnected suspension is one of lower cost and high reliability.This paper takes a two-axle truck as the research object and presents mechanically interconnected suspension and hydraulically interconnected suspension to reconcile the functional contradiction between bounce and pitch performance,the main contests and results are as follows:(1)From the research background,the necessity of improving the ride comfort and road friendliness of the truck is briefly described.Using interconnected suspension as a solution and the development of interconnected suspension systems and their application status are introduced;(2)This paper introduced the structure and working principle of anti-pitch hydraulically interconnected suspension and mechanically interconnected suspension.At the same time,their vehicle model are established.The modal parameters of the original vehicle and mechanically interconnected suspension are compared.(3)The performance of interconnected suspension is studied through the analysis of ride comfort simulation and braking simulation.The simulation results show that both the anti-pitch hydraulically interconnected suspension and mechanically interconnected suspension could solve the contradiction between bounce and pitch performance.However,their functional emphasis is different:anti-pitch hydraulically interconnected suspension can greatly improve the anti-pitch performance of the vehicle with little influence on the vertical comfort and torsion performance of the vehicle while mechanically interconnected suspension improves the vertical comfort and road friendliness of the vehicle.And the pitch performance will not be worse than the original truck because a locking device is adopted to restrain the pitch motion.(4)The key parameters of the hydraulically interconnected suspension and the mechanically interconnected suspension are studied for their influence of the vehicle performance via controlling variables method,which showed that horizontal volute spring stiffness and the size of rocker arm have little effect on ride comfort,but great influence on road friendliness.The pre-charge pressure of accumulator and diameter of the hydraulic cylinder have little influence on ride comfort,but great influence on anti-pitch performance.