基于小波变弦模型的轨道平顺性评价研究

Research of Track Regularity Based on Model of Variable Chord and Wavelet Analysis

本文提出由中点弦测法和小波分析相结合的变弦模型,模型在多分辨率分析框架下,采用Coif4作为小波基函数对轨道不平顺数据进行离散小波分解,再根据小波尺度对应的中心频率确定拉弦弦长,最后利用模拟的轨道不平顺性数据进行评价分析,结果表明小波分量绝对值与对应的评价值之间相关系数平均值大于0.93,该评价模型能准确地反映轨道各层分量的不平顺位置和幅值情况,能较好地反映轨道不平顺状况。

This paper proposes a kind of variable chord model which based on wavelet decomposition.The model is premised on a multi-resolution analysis framework,initially,using Coif4 as the wavelet basis to decompose the track irregularity data,then according to the related center frequency of the wavelet scale and the relationship between wavelength and chord length in midpoint chord measurement method to determine the string chord length,In the end,using simulated data to evaluate the track irregularity.The results show great evaluation effect that the correlation coefficients between the absolute values of wavelet components and the corresponding evaluation values are great than 0. 93,which means the evaluation model can accurately reflect the irregularity position and amplitude of component in each level of the track.