| As the replacement for leaf spring and helical spring, air spring has been widely used in the suspension on high-speed trains , automobiles and even on some tractors in foreign countries for its ascendant characteristics. In order to match the air spring better with vehicles, it is necessary for us to know the unique characteristics of the air spring better. In this article an air spring with auxiliary chamber is designed based on 1T15M-2 type air spring made by Firestone Industrial Products Company. And a variable size throttle orifice is set between air spring and the auxiliary chamber. Because the characteristics of air spring are related to the non-linear material, non-linear geometry and aerodynamics, it is difficult to calculate the stiffness accurately, which is the main characteristic of air spring. In practice, the stiffness is always obtained by test. So, in this article, the author researched the dynamic characteristics of the air spring by test. The air spring with auxiliary chamber was tested on a mechanical vibration generator. The effect of the size of the on the dynamic characteristics is studied.The result showed that the dynamic characteristics of the air spring with auxiliary chamber are interrelated observably to the size of the throttle orifice. Under the same inner pressure, for every tested throttle orifice, at each frequency the dynamic ratio of the air spring decreases as the size of throttle orifice increases, and it keeps the same when the throttle orifice is greater than about 25mm. The damping of the air spring increases at first. And then decreases as the size of throttle orifice increases. When the throttle orifice is greater than about 15mm, the damping is as the same as that without auxiliary chamber.This article has probed into the dynamic characteristic of the air spring with auxiliary chamber. The research results could be reference and guide for further study in the future.
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