## 5 Conducting Measurements of Characteristic Properties of Bearing Reducers during Their Trial Run
### Bearing Reducer Trial Run--Configuration A
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**No.** & **Type BR/Serial** & \begin{tabular}{c} **Content** \\ **Fe (ppm)** \\ **after 8 h** \\ \end{tabular} & \begin{tabular}{c} **Content** \\ **Fe (ppm)** \\ **after 24 h** \\ \end{tabular} & \
\begin{tabular}{c} **Content** \\ **Fe (ppm)** \\ **after 32 h** \\ \end{tabular} &
\begin{tabular}{c} **Content** \\ **Fe (ppm)** \\ **after 48 h** \\ \end{tabular} \\ \hline
1. & TS 050 s/n.1901 & 7 & 10 & 12 & 14 & 16 \\
2. & TS 050 s/n.1902 & 8 & 12 & 13 & 15 & 16 \\
3. & TS 050 s/n.1903 & 9 & 11 & 14 & 16 & 17 \\
4. & TS 050 s/n.1904 & 10 & 13 & 16 & 18 & 18 \\
5. & TS 050 s/n.1905 & 9 & 12 & 15 & 17 & 18 \\
6. & TS 050 s/n.1906 & 11 & 12 & 14 & 16 & 17 \\
7. & TS 050 s/n.1907 & 8 & 11 & 13 & 15 & 16 \\
8. & TS 050 s/n.1908 & 12 & 13 & 16 & 18 & 19 \\
9. & TS 050 s/n.1909 & 9 & 14 & 16 & 17 & 17 \\
10. & TS 050 s/n.1910 & 10 & 13 & 14 & 16 & 17 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Values of solid abrasive particles during 48 h of the BR TS 050 trial run. Based on the conducted measurements, we can state that the natural frequency in the radial direction ranges between 820 \(\pm\) 10 rpm. At the same time, it can be stated that the natural frequency (critical speed) in the axial direction ranges between 1260 \(\pm\) 50 rpm. The starting torque (Rm) BR TS 050-63, s/n.1901 before the trial run of CW direction is shown in Figure 9, and that for CWW direction is in Figure 10. \begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**No.**} & **Type BR/Serial** & **Natural Frequency** & **Natural Frequency** \\  & **No** & **Radial—Torsional [RPM/Hz]** & **Axially—Tipping [RPM/Hz]** \\ \hline
1. & TS 050 s/n.1901 & 840/14.0 & 1260/21.0 \\
2. & TS 050 s/n.1902 & 825/13.0 & 1210/20.0 \\
3. & TS 050 s/n.1903 & 831/12.5 & 1245/21.0 \\
4. & TS 050 s/n.1904 & 844/14.0 & 1270/20.0 \\
5. & TS 050 s/n.1905 & 837/13.0 & 1233/19.0 \\
6. & TS 050 s/n.1906 & 833/12.0 & 1250/18.5 \\
7. & TS 050 s/n.1907 & 842/14.0 & 1280/21.0 \\
8. & TS 050 s/n.1908 & 830/13.0 & 1310/22.0 \\
9. & TS 050 s/n.1909 & 820/11.0 & 1240/19.0 \\
10. & TS 050 s/n.1910 & 835/11.5 & 1260/20.0 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Values of natural BR TS 050 frequencies measured after the trial run (configuration A). Figure 8: Graphical display of the courses of the temperature on the surface of the BR TS 050 support body during the trial run. Figure 9: Starting torque (Rm) BR TS 050-63, s/n.1901—CW direction (before the trial run). Summary of partial results from the application of MDS during the trial run of the TS 050 bearing reducer--weight load (mechanical weight at the end of the arm) applied during the trial run:  
Measurements were conducted on 10 BR 050-63 samples. Before the trial run, we performed a series of measurements on the samples to identify the factual state of BR. After an initial 48 h trial run with a load factor of 9 Nm at the output, there was a decrease in the starting torque in both directions, i.e., the CW, CCW, which can be attributed to the starting of kinematic pairs during mechanical transmission. After the trial run, the parameters, such as lost motion (LM), remained unchanged. In the case of the hysteresis parameter (H), there was a slight growth in the increase in value, but the value of the difference itself is so small that no significant effect needs to be attributed thereto. The range of change is 0.03 to 0.09 arcmin (Table 6). Figure 12: Starting torque BS TS 050-63, s/n.1901—CCW direction (after the trial run). Figure 13: Course of hysteresis curve BR TS 050-63, s/n.1901 after 48 h-long trial run. From the course of the temperature values measured on the support body after the initial temperature rise to 47 \({}^{\circ}\)C, it is apparent that the temperatures stabilized at 36 \({}^{\circ}\)C after about 35 h. The maximum degree of contamination of the PG TTI lubricant with Fe solid particles was 19 ppm Fe.