A new dynamic stiffness model with hysteresis of air springs based on thermodynamics. (17th March 2022)

• Record Type: Journal Article
• Authors: Wu, M.Y.; Yin, H.; Li, X.B.; Lv, J.C.; Liang, G.Q.; Wei, Y.T.
• Is Part Of: Journal of sound and vibration. Volume 521(2022)
• Publication Date: 2022-03-17
• Subjects: Thermodynamics -- Complex stiffness -- Hysteretic characteristics -- Parameter identification -- Indicator experiment; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2021.116693
• Languages: English
• ISSNs: 0022-460X

Abstract

Highlights: Hysteresis characteristics of air springs cannot be ignored. A new dynamic model for air springs is proposed. Hysteresis characteristics of air springs is frequency-dependant. Nonlinear parameter prediction method can guide accurate modelling for air springs. Abstract: A new theoretical model of the dynamic stiffness of air springs based on thermodynamics is proposed for determining the precise algorithm for air suspension control systems. The complex stiffness formula comprehensively considers the external heat exchange equivalent damping characteristics and air spring stiffness and damping characteristics with clear physical meaning and precise mathematical expressions for each contribution. Compared with the traditional air spring model, this model is universal because it does not restrict the gas change process inside air springs. Based on the new model, a set of identification methods for key nonlinear parameters are given. The indicator experiment was carried out to validate the dynamic stiffness model and parameter identification methods under various frequencies and strokes. Finally, the influence of key parameters and their dynamic characteristics are analysed. This theory and experiment identify air spring nonlinear parameter frequency dependence and change characteristics.