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介绍了用于动车组车体和牵引变压器振动评定的两种指标,建立了车体-变压器有限元模型。改变车体与牵引变压器之间的连接参数——吊挂刚度,并在变压器及车体空簧处施加不同速度级下的对应实测振动信号,提取车体端部及变压器上部和底部振动响应,计算车体平稳性及变压器振动烈度。结果表明:当在350 km/h速度级下时,车体平稳性随着牵引变压器垂向吊挂刚度的增大而减小,在385 km/h速度级下时平稳性则随着垂向吊挂刚度的增大先减小后增大;车体平稳性随着横向吊挂刚度的增大则不发生明显改变;牵引变压器的振动烈度随着其吊挂刚度的增大也不发生明显改变。可得结论:牵引变压器自身的振动受吊挂刚度变化的影响较小;牵引变压器的垂向吊挂刚度较横向吊挂刚度对车体平稳性指标的影响程度更为显著。
The two indexes for vibration assessment of EMU car body and traction transformer are introduced. The body-transformer finite element model is established. Changing the connection parameter between the vehicle body and the traction transformer, the rigidity of the suspension, applying the corresponding measured vibration signals at different speed levels to the transformer and the body hollow spring, extracting the vibration responses at the ends of the vehicle body and the upper and the bottom of the transformer, Calculation of car body stability and transformer vibration intensity. The results show that the body stability decreases with the vertical suspension stiffness of traction transformer at 350 km / h, and the stability at the 385 km / h speed level decreases with the vertical The stiffness of the suspension increases first and then increases; the stability of the vehicle body does not change obviously with the increase of the transverse suspension stiffness; the vibration intensity of the traction transformer does not change significantly with the increase of its suspension stiffness change. It can be concluded that the vibration of the traction transformer itself is less affected by the variation of the stiffness of the suspension; the vertical suspension stiffness of the traction transformer has more significant influence on the vehicle body stability index than the transverse suspension stiffness.