Here，to further reduce vertical stiffness of air spring, improve the effect of medium and high frequency vibration isolation, and appropriately reduce lateral stiffness to attenuate vibration transmission in this direction, a compound structure air spring (CSAS) was designed and proposed. A hard elastic layer was connected in series at the lower end of the original air spring to form a laminated structure. Static and dynamic tests of the isolator were conducted. Furthermore, static and dynamic stiffnesses of the isolator were calculated using the polynomial fitting method and the ellipse method, respectively. The test results showed that the linear relationship between air spring pressure and load does not change after the hard elastic layer is connected in series to the bag; the isolator’s vertical dynamic stiffness and static one as well as its natural frequency decrease slightly, while its lateral dynamic stiffness and static one drop largely.
Key words
air spring; compound structure /
load-bearing /
stiffness
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