[3] Lei Y, Tian X Y, Qi F L, et al. Vertical track irregularity influence on the wheel high-frequency vibration in wheel-rail system[J]. Mathematical Problems in Engineering, 2016, 2016: 5082319.

[5] Perrin G, Duhamel D, Soize C, et al. Quantification of the influ-ence of the track geometry variability on the train dynamics[J]. Mechanical Systems and Signal Processing, 2015, 60–61: 945–957.

[6] Shah M. Automated visual inspection/detection of railroad track[R]. Orlando: University of Central Florida, 2010.

[13] Zhang Z F, Feng Q B, Gao Z, et al. A new laser displacement sensor based on triangulation for gauge real-time measure-ment[J]. Optics & Laser Technology, 2008, 40(2): 252–255.