LAUSR

A coupling effect of lateral deformation and rolling moment occurs when an air spring is under the influence of crosswind. This paper proposes a novel lateral stiffness modellingmethod. The lateral stiffness and torsional stiffness of an air spring are derived by thermodynamics, hydrodynamics and Newton mechanics, and uncertain parameters are identified by a numerical fitting method. Furthermore, a full-scale laboratory air spring test bench is constructed to verify the accuracy of the proposedmodel, and the impact of the lateral displacement, internal pressure, and roll angle on the lateral stiffness is discussed through sensitivity analysis. The proposedmodel is compared with the quadratic function lateral stiffness derived based on the finite element method to verify its advantages. The results show that the proposed lateral stiffness model agrees with experimental data and more precise than the FEM model. Overall, it provides better lateral stiffness characteristics of the air spring system than the FEMmodel. ARTICLE HISTORY Received 5 June 2019 Revised 6 January 2020 Accepted 1 February 2020