论文部分内容阅读
根据非线性振动理论和赫兹理论,分析了钢轨波磨与轮轨纵向自激振动幅值和接触椭圆纵向轴长的关系.分析表明,钢轨波磨产生的机理是轮对自激振动幅值大于接触椭圆纵向轴长;对于实际的轮轨系统,波磨产生的条件是轮对横移量大于临界值.据此,对波磨形成的过程进行了仿真计算并设计了再现试验。计算结果表明,在轮对横移量为8mm时,接触表面产生短波长(16~20mm)波磨.再现试验用机车轮对在滚动振动试验台上进行.当横移量为8和11mm时,均产生波磨.前者波长均匀,约20mm;后者波长不均匀,在18~27mm之间.横移量为6mm时无明显波磨.仿真计算和试验均支持关于波磨产生的机理和条件的结论.
According to nonlinear vibration theory and Hertz theory, the relationship between rail waviness and longitudinal self-excited vibration amplitude of wheel rail and longitudinal axis of contact ellipse is analyzed. The analysis shows that the mechanism of rail wavling is that the amplitude of self-excited vibration of wheelset is greater than And the length of the contact ellipse is the same as the longitudinal axis of the ellipse.For the actual wheel and rail system, the condition of corrugation is that the wheelset traverse is greater than the critical value.Accordingly, the process of corrugation formation is simulated and the reproduction experiment is designed. The results show that when the wheelset traverse amount is 8mm, the shortwave (16 ~ 20mm) ripples are generated on the contact surface, and the test wheels for the reproduction test are carried out on the rolling vibration test rig.When the horizontal displacement is 8mm and 11mm , The first wave is generated, the former wavelength is uniform, about 20mm; the latter wavelength is not uniform, between 18 ~ 27mm .Transfer amount of 6mm no significant wave mill. Simulation calculations and tests are supported on the wave mill mechanism and Conclusion of the conditions.