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Experimental study on gasification spring of maglev train
The SYS630 air spring is designed with high adaptability, allowing users to adjust its performance by modifying the angle of the upper cover, the number of rubber layers, and the hardness of the material—without altering the rubber bladder itself. This flexibility enables it to meet various stiffness requirements while maintaining the same working height and installation dimensions as the original air spring. Additionally, its vertical stiffness closely matches that of the original, making it a suitable replacement.
The SYS630 has been successfully implemented in long-distance double-decker buses manufactured by Changchun Bus Factory for Urumqi Bureau, where it replaced the original air springs. However, since the bolsters of the original bogie were not modified, the system still uses fixed orifices in practical applications.
In terms of characteristic calculations, the vertical stiffness values of the SYS130A and SYS130B air springs are presented in the data. At an internal pressure of 0.4MPa and an additional air chamber volume of 1.875L, the calculated vertical stiffness values are approximately 24N/mm for the SYS130A and 110N/mm for the SYS130B. The vertical stiffness of the maglev train air spring suspension is estimated to be around 67N/mm, resulting in a vertical self-vibration frequency of about 1.27Hz, which meets the design requirements (reference <1>).
Regarding the vertical stiffness calculation results and test outcomes, both the SYS130A and SYS130B types are analyzed. It's important to note that calculating lateral stiffness is more complex, as it depends not only on structural parameters but also on the bladder’s characteristics, such as cord material and arrangement. Currently, there is no precise formula for lateral stiffness, so it is typically estimated through design experience and confirmed via testing.
Performance tests were conducted on both the SYS130A and SYS130B air springs, following the "Air Spring Technical Regulations (Provisional)" and other technical standards. These tests included assessments of air tightness, stiffness characteristics, and compressive strength. The results show good agreement between the calculated and measured vertical stiffness values, and the lateral stiffness results align with each model’s structural features. This confirms that both air springs exhibit excellent air tightness, sufficient compressive and fatigue strength, and meet the required stiffness specifications (reference <2>).
In conclusion, the design and testing of the SYS130A and SYS130B air springs for the maglev train bogies developed by Sifang have demonstrated their reliability. They offer good airtightness, strong compressive and fatigue resistance, and appropriate vertical and lateral stiffness. The use of central suspension with these air springs significantly enhances ride comfort and plays a key role in advancing the practical application of maglev trains in China.