The SYS630 air spring has strong adaptability and can be adjusted by changing the angle of the upper cover, the number of rubber layers and the hardness of the rubber, without changing the rubber bladder, to meet different stiffness requirements. Its working height and installation size are the same as those of the original air spring, and its vertical stiffness is similar, so it can be used instead of the original air spring.
The application of SYS630 air spring SYS630 air spring has been successfully applied to the long-distance double-decker bus produced by Changchun Bus Factory for Urumqi Bureau, replacing the original air spring. Since the bolsters of the original bogie have not been modified accordingly, the air springs still use fixed orifices in practical applications.
Characteristic calculations The calculation results of the vertical stiffness of the SYS130A and SYS130B air springs are shown in . It can be seen from the figure that when the internal pressure is 0.4MPa and the additional air chamber volume is 1.875L, the calculated vertical stiffness values ​​of the SYS130A and SYS130B air springs are about 24N/mm and 110N/mm, respectively. The vertical stiffness is 67N/mm, and the vertical self-vibration frequency of the maglev train air spring suspension can be calculated to be about 1.27Hz according to the sprung mass, which basically meets the design requirements <1>.
Air spring vertical stiffness calculation results and test results (a) SYS130A type; (b) SYS130B type. It should be pointed out that due to the complicated calculation method of the lateral stiffness of the air spring, it is not only related to the structural parameters of the air spring, but also has a great relationship with the characteristics of the bladder itself (such as cord material, cord arrangement, etc.). At present, there is no accurate calculation method of lateral stiffness, so after estimating according to design experience, it is mainly determined by experiments.
The performance test is to test the performance of two types of air springs, SYS130A and SYS130B. According to the Air Spring Technical Regulations (Provisional) and related technical requirements, the Quartet includes air tightness, stiffness characteristics and compressive strength. Characteristic test inside. For comparison, the results of the vertical stiffness test are also shown in the test results of the lateral stiffness. It can be seen that there is a good agreement between the vertical stiffness test results of the two air springs and their calculation results, and the lateral stiffness test results are consistent with their respective structural characteristics. It shows that both air springs have good airtight performance and sufficient compressive strength and fatigue strength, and their vertical and lateral stiffness characteristics can also meet the design requirements <2>.
Conclusion The design calculation and test results show that the air springs for the SY130A and SYS130B maglev train magnetic bogies developed by Sifang have good airtight performance, sufficient compressive strength and fatigue strength, and their vertical and lateral stiffness characteristics. Can meet the relevant design requirements of the maglev train. The adoption of the air spring central suspension will significantly improve the ride comfort of the maglev train and play an active role in promoting the practical application of the maglev train in China.
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