Study On Mechanics Characteristics Of Airspring By Simulation And Test

With the development of high-speed railway and the raising speed of train, more and more rail vehicles adopt airsprings in recent years The higher the speed of vehicle is, the higher requirements of dynamics performance of locomotive will be, however, the dynamics performance of locomotive depends on structures and parameters of the vehicle suspension system. Airspring acts as a key component of vehicle suspension system, so it is necessary to further study its performance.Adopting numerical simulation for characteristic parameters of airspring, it not only save costs but also reduce risk. Although many scholars have been studied the characteristics of airspring by the theoretical inference and simulation analysis.The analysis are more or less simplified due to the relatively complex operating condition of airspring, so the accuracy of the calculation results and simulation datas are low. Therefore, it is necessary to establish a more accurate model to analyze characteristics of airspring.The classifications and characteristics of airspring are elaborated, and the stiffness and damping characteristics of the airspring are theoretically analyzed and the factors that affecting characteristics of airspring are obtained.The nonlinear characteristics of airspring, the gasbag vulcanization, the fluid-structure coupling and large deformation problems are considered in order to establish a more accurate model. Based on ABAQUS finite element software, axisymmetric model with an auxiliary air chamber and three-dimensional model of an airspring are established, and several aspects including the initial pressure, high standard, auxiliary air chamber, cord parameters are analyzed about the influence of vertical static stiffness and the lateral static stiffness, the influence of cord spacing, cord angle and cord layer is analyzed on the stress of cord about caculating vertical static stiffness.Dynamic stiffness of the airspring is obtained by the fluid-solid coupling method, The air flow in the airspring is numerically simulated by using co-simulation with ABAQUS and STAR-CCM+, initial pressure, frequency and amplitude on the vertical dynamic stiffness of airspring are analyzed.In order to verify the validity of the simulation analysis, the airspring product in the simulation analysis is targeted to design experiment study in terms of the stiffness and damping characteristics.