| At present, China’s High-speed Rail technology is of a rapid development period and thecomfort requirement of the high speed train is also rising. The air springs which can improvethe running quality of EMU in high speed operation and enhance the comfort of passengersare the key parts in the suspension system of EMU vehicles. Therefore, the air springs arewidely used in high speed passenger trains, quasi high speed passenger trains and subwayvehicles. We select CRH2EMU air spring as the object of study in this thesis. First of all, weestablish the3D modeling of CRH2air spring by the three-dimensional modeling software—Solidworks. Then, we establish the finite element modeling of CRH2air spring in theABAQUS analysis software. By using the finite element method, the static mechanical isanalyzed. We also analyze the static mechanics performance of the air spring by using thefinite element method. Many nonlinear problems such as the complex mechanism and thespecial material appear when we carry on the simulation analysis. The improvement in thecalculation through many methods derives a set of processing the nonlinear problem. In theprocess of analyzing the air spring with ABAQUS analysis software, we obtain a set of waysto deal with the nonlinear problems. In this thesis we obtain a series of result curves underdifferent parameters of the CRH2EMU air spring by calculating the mechanical properties ofthe air spring in various working conditions. We get the following conclusions in this thesis.1.When the air spring is in the working height of200mm, the carrying capacity of bothvertical and horizontal will be improved if we increase the pressure of the compressed air. Inaddition, the vertical and lateral stiffness of the air spring have been also improved.2.There is an increase in the stiffness and a reduction in the vertical stiffness when thecord angle increases. When we reduce the density of the cord, the stiffness of vertical andlateral will have a reduction.3.The volume of the additional air chamber has a greatly influence on verticalmechanical properties, but little influence on the transverse mechanical properties.4.The edge angle of air spring cover board has both influence on vertical and lateralstiffness, but the influence on the vertical stiffness is small. When we increase the edge angle,the lateral stiffness of air spring is also increased.5.The Rubber heap on the air spring has a ratio of5.8%on vertical stiffness, and a ratioof17.6%on the lateral stiffness.Finally, we analyze the damping characteristics of the air spring after establishing themathematical model of the air spring. The curves of the inner pressure, vibration frequency,and vibration amplitude on damping coefficient have been gotten. The results show that thedamping coefficient of the air spring system increases as the initial inner pressure and vibration amplitude increase, but decreases as the excitation frequency increases. |
