## 3 Numerical Simulations and Discussion
### Application of Adjustment Point
#### 3.3.1 Results of the First Kind of Simulation
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline Relative error & k1.xx & k2.xx & c1.xx & c2.xx & k1.yy & k2.yy & c1.yy & c2.yy \\ (\%) & 4.94 \(\times\) 10\({}^{-7}\) & 1.85 \(\times\) 10\({}^{-7}\) & 0.00472 & 0.000425 & 2.22 \(\times\) 10\({}^{-7}\) & 9.48 \(\times\) 10\({}^{-8}\) & 0.00278 & 0.00170 \\ Identified absolute & k1.xy & k2.xy & c1.xy & c2.xy & k1.yx & k2.yx & c1.yx & c2.yx \\ value & 0.0210 & 0.00870 & 0.0154 & 0.00145 & 0.0108 & 0.00762 & 0.00480 & 0.000967 \\ \hline \end{tabular}
\end{table} 
Table 10: The biggest relative identification error of main coefficients and the maximum identified absolute value of cross-coupled coefficients using g1.4. \begin{table}
\begin{tabular}{c c c c c c c c} \hline Relative error & k1.xx & k2.xx & k1.yy & k2.yy & k1.xy & k2.xy & k1.yx & k2.yx \\ (\%) & 0.00435 & 0.00350 & 0.00537 & 0.0118 & 0.0324 & 0.0218 & 0.00346 & 0.00633 \\ Relative error & c1.xx & c2.xx & c1.yy & c2.yy & c1.xy & c2.xy & c1.yx & c2.yx \\ (\%) & 1.56 \(\times\) 10\({}^{-5}\) & 0.000229 & 2.45 \(\times\) 10\({}^{-5}\) & 0.000204 & 0.000416 & 0.000188 & 9.41 \(\times\) 10\({}^{-5}\) & 0.000190 \\ \hline \end{tabular}
\end{table} 
Table 11: The biggest relative identification error using h1.1. For g4.4, according to Figure 4, the maximum relative errors of k1.xx, k2.xx,..., k8.xx are almost equal to zero. They are only \(5.75\times 10^{-7}\%\), \(2.84\times 10^{-6}\%\), \(7.88\times 10^{-6}\%\), \(5.59\times 10^{-6}\%\), \(5.03\times 10^{-5}\%\), \(8.03\times 10^{-6}\%\), \(5.28\times 10^{-6}\%\) and \(1.91\times 10^{-7}\%\), respectively. The maximum relative errors of c1.xx, c2.xx,..., c8.xx, which are only 0.0882%, 0.436%, 0.495%, 0.503%, 1.60%, 0.332%, 0.223% and 0.00755%, respectively, are bigger than that of the main stiffness coefficients in the x direction. However, they are quite small. Moreover, the maximum relative errors of k1.yy, k2.yy,..., k8.yy are only \(9.74\times 10^{-8}\%\), \(7.08\times 10^{-6}\%\), \(7.43\times 10^{-7}\%\), \(6.70\times 10^{-6}\%\), \(2.16\times 10^{-5}\%\), \(8.19\times 10^{-6}\%\), \(7.84\times 10^{-6}\%\) and \(5.98\times 10^{-8}\%\), respectively. They are also almost equal to zero. The maximum relative errors of c1.yy, c2.yy,..., c8.yy are very small, but are bigger than that of the stiffness coefficients in the y direction. They are only 0.00795%, 0.161%, 0.948%, 0.0455%, 3.52%, 0.540%, 0.0215% and 0.000922%, respectively. Tables 13 and 14, which represent the maximum identified relative errors of each bearing's main coefficients, are obtained in the second kind simulations of g1.4 and g1.1. The nodes in Tables 3 and 4 are used as adjustment points. Similar rules  
According to Figure 5, for the main coefficients, the maximum relative errors of k1.xx, k2.xx,..., k8.xx are almost equal to zero. They are only 6.89 \(\times\) 10\({}^{-7\%}\), 3.41 \(\times\) 10\({}^{-6\%}\), 9.38 \(\times\) 10\({}^{-6\%}\), 6.71 \(\times\) 10\({}^{-6\%}\), 6.04 \(\times\) 10\({}^{-5\%}\), 9.65 \(\times\) 10\({}^{-6\%}\), 6.33 \(\times\) 10\({}^{-6\%}\) and 2.39 \(\times\) 10\({}^{-7\%}\), respectively. The maximum relative errors of c1.xx, c2.xx,..., c8.xx are bigger than that of the stiffness coefficients. They are 0.0179%, 0.0869%, 0.0963%, 0.0967%, 0.3099%, 0.0734%, 0.0437% and 0.00145%, respectively, and are quite small. In the y direction, the maximum relative errors of k1.yy, k2.yy,..., k8.yy are only 2.12 \(\times\) 10\({}^{-7\%}\), 8.49 \(\times\) 10\({}^{-6\%}\), 1.28 \(\times\) 10\({}^{-6\%}\), 8.03 \(\times\) 10\({}^{-6\%}\), 2.59 \(\times\) 10\({}^{-5\%}\), 9.80 \(\times\) 10\({}^{-6\%}\), 9.38 \(\times\) 10\({}^{-6\%}\) and 1.60 \(\times\) 10\({}^{-7\%}\), respectively. The maximum relative errors of the identified c1.yy, c2.yy,..., c8.yy, which are only 0.00130%, 0.0273%, 0.187%, 0.0211%, 0.680%, 0.107%, 0.00685% and 0.000174%, respectively, are also very small; though, they are bigger than that of the stiffness coefficients.