## 3 System Test and Application
### System Application  
Taking Chengdu Metro Line 6 as the test train line for the DTRCMS application, the noise measurement module was applied between Wangcongci Station and Shuxin Avenue Station; the vibration of standing posture was measured between Shuxin Avenue Station and Xipu Station, and the vibration of sitting posture was measured between Tianyu Road Station and Wangcongci station. The test roadmap is shown in Figure 7. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Horizontal Sperling**} & \multirow{2}{*}{**Relative Tolerance**} & \multirow{2}{*}{**No.**} & \multicolumn{3}{c}{**Vertical Sperling**} & \multirow{2}{*}{**Relative Tolerance**} \\ \cline{2-2} \cline{4-7} \cline{8-8} No. & **Mobile Phone** & & & & **Mobile Phone** & & **Professional Equipment** \\ \hline
1 & 2.40 & 2.37 & 1.14\% & 1 & 2.56 & 2.58 & 0.66\% \\
2 & 2.41 & 2.39 & 0.96\% & 2 & 2.45 & 2.49 & 1.67\% \\
3 & 3.64 & 3.49 & 4.41\% & 3 & 3.28 & 3.35 & 2.12\% \\
4 & 3.49 & 3.54 & 1.24\% & 4 & 3.23 & 3.23 & 0.03\% \\
5 & 3.91 & 3.79 & 3.35\% & 5 & 3.26 & 3.35 & 2.66\% \\
6 & 3.44 & 3.50 & 1.66\% & 6 & 2.97 & 2.93 & 1.19\% \\
7 & 3.11 & 2.97 & 4.71\% & 7 & 2.94 & 2.86 & 2.62\% \\
8 & 3.06 & 2.99 & 2.14\% & 8 & 3.08 & 3.10 & 0.49\% \\
9 & 3.03 & 2.96 & 2.43\% & 9 & 3.08 & 3.10 & 0.87\% \\
10 & 3.11 & 3.15 & 1.07\% & 10 & 3.05 & 2.99 & 1.97\% \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Comparison of Sperling index values of mobile phone/professional instrument. The sound pressure levels during the noise measurement process are shown in Figure 8. The data basically remained between 65 and 75 decibels. The decibel value of the running train was in the range of 70 to 75 decibels. When the train stops and starts, the noise can reach 80 decibels. According to the GB14892-2006 (Urban Rail Transit Vehicle Noise Limits and Measurement Methods) issued by China, the noise limit of subway passenger compartments is 83 decibels, and the noise measured by DTRCMS did not exceed this limit in the whole test process. In the application of the vibration measurement module, the mobile phone was placed horizontally on the seat and the floor to simulate the two passenger states of sitting and standing, respectively. The x-axis direction of the mobile phone points towards the front of the train, as shown in Figure 9.  
Figure 8: Decibels in the test process. Figure 7: Test roadmap. Figure 9: Application site of vibration measurement: (**a**) the mobile phone placed on the seat; (**b**) the mobile phone placed on the floor. The measurement time of the standing posture vibration measurement process was 12 min; the measurement time of the sitting posture vibration measurement process was 15 min. Its three-axis acceleration curve is shown in Figure 10. The acceleration fluctuations of the two states were similar. In the subway operation stage, the acceleration fluctuations of the three axes were obvious, and they were all in the range of \(-\)0.5\(-\)0.5 m/s\({}^{2}\). When the subway stopped and started, the x-axis acceleration increased sharply, and the maximum value reached 1.5 m/s\({}^{2}\). During the stop phase of the subway, the three-direction acceleration changed smoothly. Horizontal and vertical Sperling indicators corresponding to the two states are shown in Figure 11, where the value of the vertical Sperling indicator fluctuated between 1.5 and 2, and the value of the horizontal Sperling index fluctuated around 3 (the value was around 3.5 during subway operation and around 1.5 during the stops). According to the Sperling rating table of locomotives and rolling stock in China, during the whole measurement process, for the horizontal Sperling index value, the subway operation stage is scored as \"pass\" or \"good\", due to the more obvious vibration in individual periods, and in the stop phase, the score is \"excellent\". For the vertical Sperling index value, the whole process is relatively stable, and the score is \"excellent\". The measured data of the two states are roughly consistent with actual human experience.