On-line monitoring of vertical long wavelength track irregularities using bogie pitch rate

摘要

Long wavelength track irregularities are the key factors which influence vehicle stability and comfort.An on-line monitoring method is proposed to detect the vertical long wavelength track irregularities based on bogie pitch rate.Firstly, the principle of on-line monitoring method based on bogie pitch rate was presented.Secondly, to process bogie pitch rate,a mix-filtering approach which contains double integration, baseline correction and RLS(Recursive Least Squares) adaptive compensation filter was proposed.Thirdly, a coupling dynamics model of vertical vehicle-track interactions was developed to obtain bogie pitch rate.The obtained bogie pitch rate was then filtered with the mix-filtering approach.When the processed result compares with the actual irregularities, the Standard Deviation is 0.327 mm and the Normalized Mean Square Error is-9.1495.The experimental result shows that the proposed on-line monitoring method based on bogie pitch rate and signal processing approach are capable of monitoring the long wavelength track irregularities accurately and effectively.