Development of Railway Ride Comfort Prediction Model: Incorporating Track Geometry and Rolling Stock Conditions

Development of train ride comfort prediction model for railway slab track system

“…stands for the damping ratio of primary suspension system, and are the damping and stiffness of primary suspension system and stands for the mass of bogie. In equation 13, stands for the damping ratio of secondary suspension system, and are the damping and stiffness of secondary suspension system, and stands for the mass of carbody (Dumitriu 2012, Dumitriu 2013, Dumitriu and Gheţi 2018, Dumitriu and Stănică 2019, Sadeghi et al 2020. The effects of damping ratios on the TRC were investigated through a parametric study.…”

“…Comparison of the results shows that damping ratio of secondary suspension system has a greater impact on the TRC. This is due to the fact that the bogie mass is between the primary suspension system and the carbody which reduces damping efficiency of primary suspension system (Dumitriu 2012, Dumitriu 2013, Dumitriu and Gheţi 2018, Dumitriu and Stănică 2019, Sadeghi et al 2020. The changes in damping ratio of primary suspension can cause a maximum of 16% difference in the TRC.…”

“…For this purpose, the percentages of decrease or increase in damping ratio of suspension systems against variation percentages of the TRC were calculated (for the vehicle speed of 100 km/h). The results are presented in Figure 18 where the values in the horizontal axes in Figures 18(a) and 18(b) were obtained from (� 1.23 � − 1) × 100 and (� 0.67 � − 1) × 100, respectively (Sadeghi et al 2020). The level of TRC is 2.17 for the speed of 100 km/h (refer to Figure 11), therefore the values in the vertical axes were obtained from (� 2.17 � − 1) × 100.…”

“…The best fit was used to compute the vehicle coefficient for other types of railway vehicles. This was led to an equation for the vehicle function ( ) (Sadeghi et al 2020). Subsequently, the factors of primary and secondary suspension systems were obtained as follows: = �3 × 10 −11 ∅ 6 + 1 × 10 −10 ∅ 5 − 1 × 10 −7 ∅ 4 − 3 × 10 −6 ∅ 3 + 0.0001∅ 2 + 0.0484∅ − 0.0633� 100 ⁄…”

“…The TRC (obtained from measurements or prediction models) is required for making decisions in operation and maintenance of railways. Although, some TRC prediction models have been developed for the ballasted tracks (Sadeghi et al 2020), no model is available for the slab tracks. Since properties of ballasted tracks are very different from those of slab tracks, there is a need to develop a new TRC prediction model for slab track systems.…”