关键词: 振动与波, 空气弹簧, 节流孔直径, 动力学试验, 空气弹簧试验, 垂向平稳性

Abstract:

To address the problem that second suspension systems transform from damper to orifice. The dynamics model is established on the dynamics experiments and the dynamic characteristic experiments of air spring from a certain high-speed EMUs. The vertical stability and vibration acceleration were analyzed to elect the orifice diameter of air spring. Results show that the orifice of air spring exerts influences on both vertical damping and vertical stiffness. Analyzing the vertical stability, the stiffness and damping with 0.7Hz could be equivalent with its no-linear characteristic. After dislodging vertical damper, the orifice could effectively decrease vertical vibration RMS (Root Mean Square). When the running speed outnumber 150km/h, the advisable damping ranges of vertical damper is from 10Ns/mm to20Ns/mm, in addition, the apt orifice diameter of orifice is from 12mm to 16mm. After compering the two ways, it is recommended to select the orifice to provide damping.