Test results analysis

In the above test conditions, the excitation frequency is taken 1 and 1 respectively. 5, 2, 2. 5 and 3 Hz, the amplitude is 5, 7. 5 and 10 mm, initial work pressure respectively take 1, 1. 5, 2, 2. 5 and 3 KGF (1 KGF = 9. 8 kN. Calculate dynamic stiffness according to the above experimental principle. Figure 3 shows the effect of initial air pressure on the dynamic stiffness of air spring. It can be seen from the figure that the dynamic stiffness of air springs increases correspondingly as the working pressure increases. It's basically linear. The dynamic stiffness value of air springs is generally small, and it is said that the model air spring is suitable for the vibration isolation of the internal stretcher and other equipment in the carriage of the health technology vehicle. At the same time, with the increase of amplitude, the dynamic stiffness decreases slightly.

FIG. 4 the influence of excitation frequency on the vertical dynamic stiffness of air spring. As can be seen from the figure 4, when the initial pressure must be with the increase of vibration frequency, the dynamic stiffness of air is slightly lower, and the different initial pressure of three basic parallel curve, showed that after the initial pressure change, dynamic stiffness change with vibration frequency in the same rule.

conclusion

In this paper, experimental study on the mechanics performance of the air spring, through analysis, the parameters such as type air spring stiffness and bearing capacity to suit jacket equipment such as emergency vehicles stretcher bracket vibration isolation requirements: dynamic stiffness of air spring and the corresponding increase with the increase of initial pressure, the basic linear relationship; The dynamic stiffness of air spring decreases with the increase of excitation frequency, and decreases with the increase of amplitude. The change of excitation signal does not affect the change of dynamic stiffness when the initial pressure changes.