Design And Performance Analysis Of Double Wishbone Air Suspension For Buses

In recent years,the double wishbone air suspension is widely used in new energy buses.As a combination of double wishbone suspension and air spring,it has good kinematics,easy-to-adjust roll and pitch characteristics,and excellent vibration isolation performance,which significantly improves the handling stability and ride.Due to the particularity of the buses structure and load boundary,the design and matching of the buses suspension system is mainly based on reliability,and the research on the K & C characteristics of the suspension and the dynamic characteristics of the vehicle is slightly less.In view of the above situation,theoretical research and experimental verification were carried out out on the design and matching of the double wishbone air suspension parameters,the K & C characteristics of the suspension and the dynamic performance of the vehicle.(1)The stiffnesses of suspension were designed and matched,which considering the effects of rubber bushing and swing arm flexibility.The seven-degree-of-freedom ride model for the vehicle was built to design and optimize the suspension damping.The method and requirements for suspension component selection are described from the perspective of improving suspension performance.The parameter matching platform for the initial design and development of suspension was built to help suspension design.(2)The rigid-flexible coupling model of the front suspension was built in ADAMS,and the K&C simulation was carried out.The influence of suspension hardpoints and bushing stiffness on suspension K&C characteristics was studied.The methods of adjusting hardpoints and bushing stiffness were proposed.The K&C test was carried out to verify and compare with the simulation results.(3)The multi-body dynamics model of the whole vehicle was built in ADAMS and Trucksim,and the simulation of the vehicle’s handling and ride was carried out.The influence of important suspension parameters(suspension stiffness,kingpin parameters,suspension K&C characteristics)on vehicle handling was studied to improve the vehicle handling.Finally,the handling and ride tests of the full vehicle were carried out to verify and compare with the simulation results.