Analysis of Dynamic Stiffness Effect of Primary Suspension Helical Springs on Railway Vehicle Vibration

13th International Conference on Motion and Vibration Control; 12th International Conference on Recent Advances in Structural Dynamics

Sun, W.^1,2 ; Thompson, D.J.^3 ; Zhou, J.^2 ; Gong, D.^2

School of Mechanical Engineering, Tongji University, Shanghai

201804, China^1

Institute of Rail Transit, Tongji University, Shanghai

201804, China^2

Institute of Sound and Vibration Research, University of Southampton, Southampton

SO17 1BJ, United Kingdom^3

关键词: Dynamic stiffness matrix;    High speed train (HST);    Stiffness properties;    Vehicle dynamic model;    Vehicle-track coupled dynamics;    Vibration amplitude;    Vibration isolations;    Vibration transmissibility;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/744/1/012149/pdf
DOI  :  10.1088/1742-6596/744/1/012149

来源: IOP

【 摘 要 】

Helical springs within the primary suspension are critical components for isolating the whole vehicle system from vibration generated at the wheel/rail contact. As train speeds increase, the frequency region of excitation becomes larger, and a simplified static stiffness can no longer represent the real stiffness property in a vehicle dynamic model. Coil springs in particular exhibit strong internal resonances, which lead to high vibration amplitudes within the spring itself as well as degradation of the vibration isolation. In this paper, the dynamic stiffness matrix method is used to determine the dynamic stiffness of a helical spring from a vehicle primary suspension. Results are confirmed with a finite element analysis. Then the spring dynamic stiffness is included within a vehicle-track coupled dynamic model of a high speed train and the effect of the dynamic stiffening of the spring on the vehicle vibration is investigated. It is shown that, for frequencies above about 50 Hz, the dynamic stiffness of the helical spring changes sharply. Due to this effect, the vibration transmissibility increases considerably which results in poor vibration isolation of the primary suspension. Introducing a rubber layer in series with the coil spring can attenuate this effect.