| In the circumstance of expanding road transportation of China, especially the expanding highway transportation environment, the dual-axle-steering commercial vehicle entering the market gradually. Compared with the traditional commercial vehicle, the structure of dual-axle-steering commercial vehicle is more complex, and the lack of relevant research leads to some problems such as load unbalance, poor handling stability and abnormal tire wear.As the key link between the tire and the frame, the suspension system plays an important role in the performance of the vehicle. The allocation of suspension system is reasonable or not will directly affects the vehicle handling stability and ride comfort, which also affects the the axle load distribution of heavy commercial vehicles. And due to the arrangement of the double front axle of dual-axle-steering commercial vehicle, the unscientific match of suspension parameters will lead to the abnormal tire wear due to the uneven distribution of axle load.In this paper, the influence of the steering axle suspension leaf spring stiffness on vehicle load balancing has been analyzed by the ADAMS rigid-flexible coupling modeling and simulation. Taking axle load balance of steering axle as the goal of the match analysis of spring parameters, while give consideration of the impact of vehicle ride comfort when the spring parameters changing, finally obtained the leaf spring matching results of the dual-axle-steering vehicle.Firstly, this paper briefly described the research of dual-axle-steering tractor, and Hyperworks software was utilized on modeling and simulation about some key assembly such as leafspring, frame and cab. In order to facilitate the modeling, simplified the leafspring assembly into single plate spring. By the method of import MNF files which created by the HyperMesh into ADAMS, the modeling of flexible components has been done and the the correctness of the model has been verified.Secondly, the multi-body dynamics simulation analysis of the whole vehicle was carried out by using the ADAMS software. The vehicle rigid-flexible coupling multi-body dynamics model has been established and verified. The whole vehicle model was simulated under three kinds of working conditions, and produced the tire force curve, and calculated the axle load values. By comparing the simulation results with the experimental data, the credibility of the whole vehicle model was validated.Finally, based on the influence of the axle load distribution on ride comfort, the leafspring stiffness of the suspension system was matched and analyzed. On the premise which the second bridge suspension stiffness remains unchanged, the leafspring stiffness of the first bridge suspension was adjusted within the allowable range of design. A series of simulation analysis and comparison has been done, the spring stiffness parameters which can make the axle load balance has obtained. Giving consideration of the impact on vehicle ride comfort when the spring parameters changes, the acceleration change of cab floor was simulated and matching parameters was selected again. By considering, the most suitable leaf spring parameters was found to achieve the purpose of improving vehicle load balancing. |
