关键词: 动刚度, 附加气室, 空气弹簧, 连接管路, 试验台

Abstract: In view of work process complexity of the air spring with auxiliary chamber connected with pipe and its special non-linear, characteristics, a test-platform for the air spring with auxiliary chamber is developed. The characteristics of air spring with different chamber or different pipe are tested. And test software based on LabView is developed. Spring force, displacement and internal air pressure can be measured with data acquisition systems. The dynamic characteristics of air spring with 4 different volume chambers, 4 different connecting pipe diameters and 4 different pressures inside air spring in exciting frequency range of 0.5～10.0 Hz are tested. An experimental analysis is carried out to find out the influence of the involved factors on the characteristics of the spring, and the influencing mechanism is analyzed. The experimental results show that testing variables have different influence on characteristics of air spring: As the volume of the auxiliary chamber and diameter of the connecting pipe increase, the spring dynamic stiffness will decrease accordingly, however, when the auxiliary volume differs, how much can it influence the spring dynamic stiffness still depends on the volume rate between the air spring and the auxiliary chamber; and the spring dynamic stiffness will rise with the initial pressure in the air spring and the excitation frequency increase. So the bench test can provide a basis for the design and the application of air spring with auxiliary chamber.

Key words: Air spring, Auxiliary chamber, Connecting pipe, Dynamic stiffness, Test-platform