The Mechanism of Rail Corrugation Generation and Development – Variation of Difference between Wheel and Rail Receptances
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摘要: 通过研究轨道系统不连续支承钢轨柔度的变化及轮轨系统动柔度关系,提出了“轮轨柔度差变”机理,该机理能有效地描述钢轨波浪磨耗产生和发展的原因,通过轨道动柔度理论计算和实验验证及运营条件下实际钢轨波浪磨耗现象的比较,得出一致的结论,从而充分证明了轮轨柔度差变和钢轨不连续支承及轨道支承刚度变化是钢轨波浪磨耗形成的主要原因之一,根据本文提出的钢轨波浪磨耗产生和发展机理,降低轮轨柔度差变及控制钢轨振动能够有效抑制钢轨波浪磨耗的形成与发展。通过在线对采用低刚度谐振动力阻尼隔振扣件的线路与原有普通线路上采用刚度较高扣件的轨道线路上钢轨粗糙度在不同时间间隔进行的测试比较,结果表明,在普通线路上采用刚度较高扣件的轨道线路上钢轨的粗糙度较高,而在安装低刚度谐振动力阻尼隔振扣件的线路上钢轨粗糙度反而有所下降,同时其钢轨本身在垂直方向及横向振动水平也有所下降。Abstract: Through the study of variation on rail dynamics of a discrete support track and the relationship between the wheel and rail receptances, it was found that the difference of wheel and rail receptance and its variation is one of main factors of rail corrugation generation and development. Theoretical prediction and site measurement of the receptance have demonstrated a good agreement. Based on the mechanism of rail corrugation generation discussed in this paper, it is concluded that the key means to slow down the corrugation growth is to reduce the difference of rail receptance and control the rail vibration. Test on a normal slab track with lower stiffness fastenings and tuned vibration dampers has shown that the rail corrugation and rail vibration levels measured on the rails in both vertical and lateral directions are all lower compared to the track with standard rail fastenings.
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Keywords:
- corrugation /
- rail vibration /
- receptance /
- discrete rail support /
- roughness /
- stiffness /
- noise /
- tuned damper
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