Dynamics Modeling and Sensitivity Analysis of Throttling Pipe Air Damping Air Spring under Turbulent Flow Effect

doi:10.3901/JME.2024.23.205

Abstract

Abstract: Takeing the throttling pipe air damping air spring as the research object,and establishes the main and auxiliary chamber models of the air spring based on thermodynamics and fluid mechanics; Considering the nonlinear characteristics of compressed air flow inside the throttling damping pipe during the operation of the throttling pipe air damping air spring, the turbulence model of the throttling damping pipe is built. The compressed air flow exchange model inside system is jointly constructed. Then, Coulomb friction model and fractional derivative Kelvin Voigt model are used to describe the amplitude-frequency characteristics of the rubber bellows of the PADAS. As well as combining with the compressed air flow exchange model, the dynamic model of the throttling pipe air damping air spring is proposed. The dynamic model is linearized near the working equilibrium point of the system and the quantitative indexes of the dynamic characteristic of the system are proposed. On this basis,the effects of the turbulent flow effect of the throttling damping pipe and the mechanical characteristics of the rubber bellows on the dynamic characteristics of the PADAS system are analyzed, showing that the established model can effectively describe the amplitude frequency characteristics of the PADAS system, and the effectiveness and accuracy of the model are verified; Moreover, the further research is conducted on the influence of the key design parameters of throttling damping pipe on the quantitative index of system.The research results provide the theoretical guidance for the industrialization of air damping air spring in the intelligent chassis of new energy vehicles.

Key words: air damping air spring, rubber bellows, turbulent flow effect, dynamic characteristic, sensitivity analysis

CLC Number:

U463

CHEN Junjie, LIU Chen, QIU Guangqi. Dynamics Modeling and Sensitivity Analysis of Throttling Pipe Air Damping Air Spring under Turbulent Flow Effect[J]. Journal of Mechanical Engineering, 2024, 60(23): 205-215.

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