Analysis Of Static And Dynamic Characteristics Of Cab Air Spring Based On Gas-solid Coupling

With the rapid development of the domestic logistics industry,the transportation volume of commercial vehicles has increased rapidly,and people have put forward higher requirements for the comfort of long-distance driving.The traditional commercial vehicle cab suspension system adopts rubber suspension and coil spring,which has poor vibration isolation effect and cannot meet people’s requirements.Compared with rubber mounts,air springs have excellent elastic properties and vibration isolation effects,and have significant advantages in improving the riding comfort of commercial vehicle cabs.In the future development process,the application of air springs in commercial vehicles will become more and more more extensive.However,there is currently a lack of detailed research on the change law of the spring stiffness of the air spring piston structural parameters,the number of cord layers and other factors.Therefore,it is of great significance to study the static and dynamic stiffness performance of the air spring and apply it to the cab suspension system.In order to more accurately predict the stiffness performance of the air spring in the cab,different air-solid coupling methods are used to simulate and analyze it.Influence law of static and dynamic stiffness of air spring.The gas-solid coupling simulation model of the air spring is established by using the solid element and virtual element methods respectively,and the static and dynamic stiffness of the air spring under different methods is analyzed.The simulation analysis results are compared with the experimental results to verify the correctness of the gas-solid coupling model.The stiffness curve,convergence and efficiency of the air spring under the two simulation methods are compared,and the virtual element is finally adopted as the analysis method in this paper.Due to the large number of research objects and many repetitive operations in the simulation analysis process,in order to improve the analysis efficiency,this paper uses Python language in Abaqus to carry out the secondary development of the air spring static and dynamic stiffness simulation analysis process.The functions of continuous execution,batch processing,stiffness value calculation and storage of multiple simulations are realized.The GUI simulation results are compared with the script simulation results to verify the correctness of script writing.In order to improve the efficiency of the simulation,the script simulation method is used to study the influence of different structural parameters on the static and dynamic stiffness of the air spring.The sensitivity of different structural parameters to the air spring stiffness is analyzed,and finally the structural parameters with greater sensitivity are selected,and the influence of these single structural parameters and the initial internal pressure on the air spring stiffness is analyzed.Finally,combining the initial internal pressure,the structural parameters of the piston and the structural parameters with less sensitivity,the influence of the three influencing factors on the stiffness characteristics is analyzed.The research shows that the piston truncated truncated angle has a great influence on the static and dynamic stiffness of the air spring,especially on the dynamic stiffness,and there is a strong coupling effect on the static and dynamic stiffness when the piston structural parameters and the initial internal pressure work together.The stiffness curve of the air spring can be better optimized by adjusting the structural parameters of the piston,which provides a theoretical basis for the structural design of the air spring.