# Design and Testing of a Measurement Device for High-Speed Bearing Evaluation
## 3 Results
### Measurement of High-Frequency Vibrations  
Measurement of high-frequency vibrations is the process of obtaining quantitative data on vibrations that have high frequencies. Measuring high-frequency vibrations is important for diagnosing faults, monitoring conditions, and preventing failures in these systems. Measurement of high-frequency vibrations is one of the subsequent stages of the overall measurement and is carried out at 110,000 RPM. These are the maximum speeds at which the measurement is conducted. This value is not common in the use of bearings, but it allows us to test the bearings under increased load. At steady high speeds (110,000 RPM of the rotor), further measurements were carried out to evaluate additional parameters. Were measured:  
* A total of 5 different high-frequency parameters commonly used for assessing the condition of textile bearings. From these, the overall average parameter AVG5 (g) was calculated. * Acoustic emissions (AE). Each bearing was measured at stable speeds twice: once when reaching the desired speed of 110,000 RPM, and then after another continuous 5 min of operation to assess any changes in the operational parameters of the bearings under extended load. During the measurement of high-frequency vibrations, values were recorded and documented, subsequently processed, and included in Tables 2 and 3. These tables contain detailed data on the dynamic responses of the bearings to high-frequency vibrations under the same settings and conditions. Based on this measured data, the average values of these dynamic responses were calculated, which serve as the basis for further analysis and comparisons. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Bearing** & **L019.6** & **L026.6** & **L027.6** & **L028.6** & **L081** & **L083** & **L084** & **L087** & **Avg.** \\ \hline AVG5 110 k rpm (0 min) & 3.68 & 2.08 & 1.98 & 3.87 & 2.61 & 2.79 & 1.44 & 1.97 & 2.55 \\
110 k rpm (5 min) & 3.82 & 3.51 & 2.24 & 4.28 & 1.69 & 2.82 & 1.78 & 2.39 & 2.82 \\ \hline \end{tabular}
\end{table} 
Table 2: High-frequency vibrations—parameter AVG5 (g)—Group A. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Bearing** & **L088** & **L091** & **L093** & **L094** & **L098** & **L099** & **L100** & **L338** & **Avg.** \\ \hline AVG5 110 k rpm (0 min) & 1.74 & 2.95 & 3.01 & 2.54 & 1.87 & 1.69 & 2.51 & 2.61 & 2.37 \\
110 k rpm (5 min) & 2.26 & 2.12 & 3.15 & 3.16 & 2.36 & 2.17 & 1.55 & 3.28 & 2.51 \\ \hline \end{tabular}
\end{table} 
Table 3: High-frequency vibrations—parameter AVG5 (g)—Group B. The graphical representation of these measured values and average characteristics was performed in the form of a bar chart shown in Figure 11 for group A and in Figure 12 for group B. This chart clearly illustrates the mutual comparison and displays the differences in dynamic responses between different bearings. These visually presented data serve as an important tool for obtaining a better understanding of the impact of various lubricants on the dynamic characteristics of bearings. \[\overline{AVGS_{A11}}=\frac{\sum_{i=1}^{n}AVGS_{A11i}}{n}=\frac{3.68+2.08+1.98+3. 87+2.61+2.79+1.44+1.97}{8}=2.55 \tag{1}\]  
These measured values and their graphical representations play key roles in the analysis of the impact of relubrication with the original lubricant and the lubricant with the addition of nanoparticle additives. These data allow us to quantitatively compare the effects of these changes in terms pf the impact of lubricant configuration on dynamic responses and contribute to broader research results analysis. Similarly, the impact of relubrication upon reaching 110,000 rpm (Figure 13) and after 5 min of operation at 110,000 rpm (Figure 14) were analyzed using FFP (fast Fourier transform) spectra. Frequency analysis (FFP) is an important tool in the diagnosis and condition monitoring of bearings.