## 5 Conducting Measurements of Characteristic Properties of Bearing Reducers during Their Trial Run  
### Bearing Reducer Trial Run--Configuration A  
The measurement was performed in a type A configuration, i.e., the load was applied onto the arm by means of a mechanical weight. The measurements of the examined object were performed on 10 samples with a load of 50% TR at a constant rotational input frequency of 1000 rpm over 48 h. During the trial run mode, the temperature on the surface of the BR support body was measured and logged. Abrason particle measurements were taken at eight-hour intervals throughout the BR trial run period. Bearing reducer TS 050 parameters measured before the trial run in configuration A are shown in Table 2.  
A measurement of the starting BR TS 050 torque values was performed under the following parameters:  
* Input rotation speed: 10 rpm. * Number of output flange revolutions completed: 1 revolution. * Number of shaft revolutions completed: 63 revolutions. * Sensor sampling frequency: 200 smps/s. * Sensor resolution: 1:1. * Ambient temperature: 21 \({}^{\circ}\)C \(\pm\) 2. * Test cycle:
* Torsional moment M\({}_{\rm t}\) (m = 4.0 kg on the arm of 0.425 m). * When measuring M\({}_{\rm t}\) loaded to tipping moment Mc = 44 Nm. * Average cycle torque T\({}_{\rm ave}\) = 16 Nm. * Average input speed n\({}_{\rm ave}\) = 2054 rpm. * No cycle pause \(\geq\) load factor Z = 100%. * Acceleration time to 1000 rpm t\({}_{\rm acc}\) = 0.5 s.
* Reverse cycle S8. The measurement of the Fe solids' concentration was carried out during the entire BR trial run in the (mechanical) weight application configuration, according to the conditions set out in Table 3. The measurement of temperature changes on the surface of the BR support body was performed using a sensor with a built-in magnet of the Alnico type, which is suitable for measuring the surface temperature of steel surfaces. The sensor was attached with a magnet. Temperature measurements were performed during the entire period (48 h) of the trial run at 1 h intervals. During the measurement, the alarm value was set at 60 \({}^{\circ}\)C, which is the maximum permissible value set by the manufacturer on the BR support body. The summary values of the surface temperatures BR are shown in Figure 8.  
After 48 h of the continuous trial run mode, diagnostics were performed by means of the so-called bump test. The aim of the test was to determine the natural frequencies of the measured BR 050 system in the torsional and tipping direction. The vibration sensor of the triaxial accelerometer PBC 356B18 was glued to the support body in the vertical direction. The accelerometer was mounted on a mechanical arm. The summary of the natural frequency values measured in the axial and radial direction for the individual BR samples is shown in Table 4. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**No.** & **Type BR/Serial No** & \begin{tabular}{c} **Lost Motion** \\ **[arcmin]** \\ \end{tabular} & \begin{tabular}{c} **Hysteresis** \\ **[arcmin]** \\ \end{tabular} & \
\begin{tabular}{c} **Rm (CW)** \\ **[Nm]** \\ \end{tabular} &
\begin{tabular}{c} **Rm (CCW)** \\ **[Nm]** \\ \end{tabular} \\ \hline
1. & TS 050 s/n.1901 & 0.57 & 0.42 & 0.030 & 0.036 \\
2. & TS 050 s/n.1902 & 0.64 & 0.55 & 0.031 & 0.023 \\
3. & TS 050 s/n.1903 & 0.57 & 0.44 & 0.027 & 0.021 \\
4. & TS 050 s/n.1904 & 0.52 & 0.55 & 0.024 & 0.017 \\
5. & TS 050 s/n.1905 & 0.53 & 0.45 & 0.027 & 0.033 \\
6. & TS 050 s/n.1906 & 0.55 & 0.42 & 0.032 & 0.024 \\
7. & TS 050 s/n.1907 & 0.69 & 0.41 & 0.039 & 0.044 \\
8. & TS 050 s/n.1908 & 0.55 & 0.53 & 0.030 & 0.027 \\
9. & TS 050 s/n.1909 & 0.51 & 0.52 & 0.039 & 0.044 \\
10. & TS 050 s/n.1910 & 0.64 & 0.44 & 0.037 & 0.043 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Bearing reducer TS 050 parameters measured before the trial run (configuration A).