# Research on a Comprehensive Evaluation Method of Train Anti-Slip System Performance
## 4 Construction of a Comprehensive Test Platform for Anti-Slip Evaluation
### Verification of Comprehensive Test Platform for Anti-Slip System  
According to the performance requirements of EN 15595 [1] for anti-slip simulation devices, it is necessary to adjust the parameters of the vehicle and wheel-rail model, reproduce the actual vehicle slipping test conditions on the platform, and compare the actual vehicle test data to verify the accuracy and effectiveness of the platform test in simulating the actual train slipping conditions. The dry rail test simulated the high adhesion conditions of the wheel-rail when the vehicle does not slip during normal braking. The actual speed, deceleration, braking distance, etc., obtained from the platform simulation test were compared and verified with the data obtained from the actual vehicle test or theoretical data obtained from the design parameters of the anti-slip controller. The test requirement was to simulate the braking distance under different initial speeds, and the error between the theoretical braking distance calculated based on the target deceleration plus 0.5 s of idle time was not to exceed 5%. The test results are shown in Table 10. The test results show that the error between the simulated braking distance and the theoretical braking distance under all conditions was less than 5%, and the performance met the requirements. The selected conditions for the actual vehicle test data were as follows. The initial speed of T vehicle collecting data was 150 km/h, and the initial speed of M vehicle collecting data was 117 km/h. The braking level was fast braking, with low adhesion conditions created by spraying antifreeze on the rail. By selecting appropriate vehicle parameters and virtual rail model parameters, the actual vehicle anti-slip test process was reproduced on the anti-slip test platform, and the simulation results were compared and verified with the actual vehicle test results according to the above three requirements. Due to the inconsistency in the collection time points of the actual vehicle test data for T and M vehicles, the simulation values of T and M vehicles were compared and verified with the actual vehicle test values. According to the requirements of the relevant chapters in the EN 15595 on the performance verification of anti-slip simulation devices, the comparison of actual vehicle test data should be conducted under wet rail conditions. The comparison items include braking distance, speed curve, and slip rate distribution. The calculation method is detailed in the EN 15595. The test results are shown in Table 11. The test results showed that the error between the simulated braking distance and the theoretical braking distance under all conditions was less than 5%, and the performance met the requirements. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Brake Level** & **Initial Braking Speed (km/h)** & \begin{tabular}{c} **Simulated Braking** \\ **Distance (m)** \\ \end{tabular} & \begin{tabular}{c} **Theoretical Braking** \\ **Distance (m)** \\ \end{tabular} & \
\begin{tabular}{c} **Error (\%)** \\ \end{tabular} \\ \hline \multirow{3}{*}{
\begin{tabular}{c} Maximum service \\ braking \\ \end{tabular} } & 100 & 550.51 & 542.463 & 1.48 \\  & 200 & 2612.66 & 2603.54 & 0.35 \\  & 300 & 7072.84 & 7139.20 & 0.93 \\ \hline \multirow{3}{*}{Fast braking} & 100 & 314.33 & 301.52 & 4.25 \\  & 200 & 1403.87 & 1367.57 & 2.65 \\  & 300 & 4015.98 & 3951.21 & 1.64 \\ \hline \multirow{3}{*}{Emergency braking} & 100 & 412.66 & 399.70 & 3.24 \\  & 200 & 1619.55 & 1582.68 & 2.33 \\ \cline{1-1}  & 300 & 4078.72 & 4015.48 & 1.58 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Parameter values of adhesion model under different working conditions.