## 4 Results and Discussion
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Bearings** & \multicolumn{2}{c}{\(\varepsilon\)**=0.2**} & \multicolumn{2}{c}{\(\varepsilon\)**=0.432**} \\ \cline{2-5}
**Characteristics** & **Present Study** & **Ref. [45]** & **Present Study** & **Ref. [45]** \\ \hline \(\varphi\) & 90.41 & 90.37 & 70.93 & 69.69 \\ \hline \(S_{XX}\) & 0.59 & 0.58 & 1.37 & 1.34 \\ \hline \(S_{XY}\) & \(-4.68\) & \(-4.79\) & \(-0.17\) & \(-0.16\) \\ \hline \(S_{YX}\) & 5.49 & 5.58 & 3.54 & 3.60 \\ \hline \(S_{YY}\) & 8.78 & 8.93 & 5.22 & 5.36 \\ \hline \(B_{XX}\) & 4.86 & 4.82 & 1.43 & 1.42 \\ \hline \(B_{XY}=B_{YX}\) & \(-4.39\) & \(-4.5\) & 1.36 & 1.34 \\ \hline \(B_{YY}\) & 17.82 & 17.99 & 7.81 & 7.67 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Effect of rotor eccentricity ratio \(\left(\varepsilon\right)\) on attitude angle \(\left(\phi_{0}\right)\), stiffness \(\left(\text{S}\right)\), and damping \(\left(\text{B}\right)\) coefficients in two-lobe journal bearings with Newtonian lubricant, \(\delta=0.5\), \(\text{L/D}=1\). \begin{table}
\begin{tabular}{c c c} \hline \hline
**Parameter** & **Definition** & \begin{tabular}{c} **Number and Magnitude** \\ **(Dimensionless)** \\ \end{tabular}  \\ \hline \(N_{xD}\) & \begin{tabular}{c} The number of textures in the \\ circumferential direction \\ Number of textures in the \\ longitudinal direction \\ Dimensionless radius of textures in the \\ circumferential direction \\ Dimensionless radius of textures in the \\ longitudinal direction \\ \(\varepsilon\) \\ The starting point of the texture in the \\ longitudinal direction \\ \(z_{1}\) \\ \(z_{2}\) \\ \end{tabular}  & \ \begin{tabular}{c} 5 \\ 10 \\ 0.047619 \\ Dimensionless radius of textures in the \\ longitudinal direction \\ The starting point of the texture in the \\ longitudinal direction \\ \(\varepsilon\) \\ \end{tabular}  \\ \(z_{1}\) &
\begin{tabular}{c} The analysis results examining both static and dynamic performance parameters of two-lobe bearings are presented subsequently. To facilitate direct comparison with actual operational data, Tables A1 and A2 in the Appendix A detail the specifications of a reference rotor-bearing system and provide the necessary conversion coefficients for dimensional scaling of the bearing performance characteristics. Figure 9 displays the three-dimensional profiles of both lubricant film thickness \(\left(\overline{\text{h}}_{n}\right)\) and corresponding pressure distribution \(\left(\overline{\text{P}}\right)\) in a two-lobe journal bearing, incorporating cubic, cylindrical, and semi-ellipsoidal surface textures within circumferential angular  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Bearings** & \multicolumn{2}{c}{\(\varepsilon\)**=0.2**} & \multicolumn{2}{c}{\(\varepsilon\)**=0.432**} \\ \cline{2-5}
**Characteristics** & **Present Study** & **Ref. [45]** & **Present Study** & **Ref. [45]** \\ \hline \(\varphi\) & 90.41 & 90.37 & 70.93 & 69.69 \\ \hline \(S_{XX}\) & 0.59 & 0.58 & 1.37 & 1.34 \\ \hline \(S_{XY}\) & \(-4.68\) & \(-4.79\) & \(-0.17\) & \(-0.16\) \\ \hline \(S_{YX}\) & 5.49 & 5.58 & 3.54 & 3.60 \\ \hline \(S_{YYsectors of 270-300\({}^{\circ}\) and 300-330\({}^{\circ}\) at a dimensionless depth of 0.5, along with comparative results for a conventional plain journal bearing. Pressure distribution comparisons clearly demonstrate that surface texturing within the bearing's maximum pressure zone (270-300\({}^{\circ}\)) elevates peak pressure values compared to untextured bearings. Among the texture geometries examined, cubic patterns produce the most substantial pressure enhancement in this angular region, with cylindrical and semi-ellipsoidal variants following in descending order of effectiveness.