轨道参数对无缝线路稳定性影响的敏感性分析

以不等波长无缝线路稳定性计算公式作为系统数学模型,采用单参数敏感性分析方法,分析轨道参数对允许温升和轨道变形波长的影响,计算各自的敏感度系数。结果表明,轨道原始弯曲矢长比、轨道横移值对允许温差的敏感度系数影响很大,属于敏感参数,而钢轨扣件的阻矩系数H的敏感度系数相对较小,但仍在较敏感范围。对变形波长来说,轨道横移值是敏感参数,轨道原始弯曲矢长比、钢轨扣件阻矩系数H较敏感参数。计算结果表明,对不同的参数基准值,敏感度系数也不同。忽略轨道原始弯曲矢长比对变形波长的影响,计算的允许温差,其结果与变形波长随轨道原始弯曲矢长比变化时的允许温差相差甚微。

Analysis of Track Parameter Sensitivity to CWR Stability

Based on the calculation formula of CWR stability with the rail initial deformation wavelength unequal to the rail elastic distortion wavelength and using the single parameter sensitivity analysis method, the paper analyzes the relationship between the rail elastic distortion wavelength, the range of allowable temperature variation of CWR, the ratio of the rail initial deformation offset and its wavelength, the offset of rail elastic distortion and the rail fastening resistance moment coefficient H in a variable range. At the same time, the sensitive coefficient of the rail elastic distortion wavelength and the range of the allowable temperature variation to these three coefficients are calculated with single-parameter sensitivity analysis method. The results show that the ratio of rail initial deformation offset, its wavelength and rail elastic distortion offset are more sensitive parameters than others while the rail fastening resistance moment coefficient H is less sensitive to the allowable temperature variation of CWR. The rail initial deformation offset is a sensitive parameter but the other two are comparatively sensitive parameters in influencing the rail elastic distortion wavelength. The analysis also shows that the sensitivity coefficient varies with the parameter benchmark value. When the ratio of the initial rail deformation offset and its wavelength is neglected in influencing the rail elastic distortion wavelength, the calculated allowable temperature variation is not different from that when the ratio is considered.