Abstract
Establishing a correct and reliable vertical stiffness model has an important significance on reproducing the characteristics of an air spring system. In this paper, a dynamic vertical stiffness model is developed based on thermodynamics and fluid dynamics, and geometric parameters are identified by an approximate analytical method. Meanwhile, experimental tests are performed to verify the accuracy and reliability of the proposed model. Furthermore, the impact of geometric parameters on the vertical stiffness characteristics is discussed through a sensitivity analysis. The conclusions show that the dynamic vertical stiffness model can well characterize the dynamic characteristics of the air spring system, which provides a theoretical basis for the optimal design of air spring parameters and the study of mechanical properties.
Highlights
With significant advantages of vibration isolation performance, air spring suspension systems have been extensively applied in urban rail vehicles, high-speed trains, and commercial vehicles [1]. e air spring effectively attenuates harmful vibration and improves the running stability and ride comfort of vehicles
A research conclusion showed that the dynamic vertical stiffness model can accurately predict the mechanical characteristics of the air spring system, and some valuable suggestions were obtained, which can provide guidance for air spring parameter optimization design and mechanical performance improvement
A dynamic vertical stiffness model for free membrane-type air spring was constructed based on thermodynamics and fluid dynamics, and the geometric parameters were processed with an approximate analytical method
Summary
With significant advantages of vibration isolation performance, air spring suspension systems have been extensively applied in urban rail vehicles, high-speed trains, and commercial vehicles [1]. e air spring effectively attenuates harmful vibration and improves the running stability and ride comfort of vehicles. E air spring effectively attenuates harmful vibration and improves the running stability and ride comfort of vehicles. Establishing a correct and reliable model has an important significance on reproducing the characteristics of the air spring system and improving the stability and ride comfort of vehicles. Erefore, establishing a precise vertical model is the key to investigate the characteristics of the air spring system and analyze the influence of geometric parameters on the stiffness performance and vehicle ride comfort. Enormous efforts have been devoted by many scholars to the vertical stiffness modeling and geometric parameter optimization analysis of the air spring system. Alonso et al [2] established a test bench to describe the characteristics of the air spring system and explored the relationship between the geometric parameters and ride comfort. Docquier et al [11] presented several models of the bellow-pipe-tank pneumatic suspension subsystem, and each element was analyzed to produce a global model for Mathematical Problems in Engineering
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