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根据高速铁路轨道几何不平顺毛刺异常值突然变化的特性,设计了改进模糊消刺方法,将差分突然增大或变小的点定义为毛刺异常值的起点,将与起点相近的差分反向突然变化的点定义为毛刺异常值的终点,选取包含毛刺异常值的最小区间的两个端点为插值点,用其近似线性插值代替原来的毛刺异常值。按照单位分解原理构造隶属度函数,并通过增加预判断,避免数据点正常时计算向前差分、规则激发度量函数和模糊基函数。计算结果表明:改进方法的计算精度与原模糊滤波方法相同,但当计算长度大于500km时,计算时间小于原来的1/300,它更适合在线实现;利用改进方法对包含毛刺异常值的模拟轨道几何不平顺信号进行消刺处理,滤波后的信号与解析信号的误差小于10-3;利用改进方法不但能准确识别毛刺异常值的位置并自动修复,而且能完整保留道岔处大轨距和大轨向等有用信息。
According to the abrupt change of abrupt burr irregularities in high-speed railway track, an improved fuzzy ablation method is designed. The point where abrupt increase or decrease suddenly increases is defined as the starting point of abnormal abrupt value. The change point is defined as the end point of the abnormal value of the burr. The two end points of the minimum interval containing the abnormal value of the burr are selected as the interpolation points, and the approximate linear interpolation is used to replace the original abnormal value of the burr. According to the unit decomposition principle, the membership function is constructed, and the forward difference, the rule excitation measurement function and the fuzzy basis function are avoided by adding the pre-judgment to avoid the data point being normal. The calculation results show that the calculation accuracy of the improved method is the same as that of the original fuzzy filtering method. However, when the calculated length is more than 500km, the calculation time is less than 1/300, which is more suitable for on-line implementation. The improved method is applied to the simulated orbit Geometric irregular signal to eliminate spikes processing, the filtered signal and the analytic signal error is less than 10-3; using improved methods can not only accurately identify the location of burr outliers and automatically repair, and can fully retain the large gauge and turnout large Rail and other useful information.