Study of Influence Factors on Ejection Impact Performance of Air Spring

Based on the nonlinear characteristics of air spring, a fluid-structure coupled ejection model is established, and the accuracy of the model is verified by ejection impact test system. Based on this model, the influence of initial pressure and compression displacement on the ejection impact performance of air spring is studied, and the phenomenon of reciprocating oscillation of air spring in the ejection process is reproduced. It is shown that the ejection impact performance of air spring can be significantly improved by adjusting the initial pressure and the compression displacement. Furthermore, the influence of cord angle, cord layer, cord spacing, cord diameter and distance from the middle surface on the air spring ejection performance is analyzed by changing the parameters of the rebar model. The results show that the influence of cord parameters on ejection impact performance is limited, but the increase of cord layers can improve the stability of air spring effectively. The analysis results are helpful to broaden the engineering application of air spring, promote the development of relevant crash test and improve the passive safety performance of vehicles.