## 3 Numerical Simulations and Discussion
### Finding of Adjustment Point
#### 3.2.1 Results
\begin{array}{cccccccc}&\#1B&\#2B&\#3B&\#4B&\#5B&\#6B& \#7B&\#8B\\ \#14P&0.00795&5.25&40.9&2761&8824&190712&358496&924266\\ \#29P&0.150&0.161&0.888&115&472&5714&993&28609\\ \#33P&0.366&1.19&0.948&74.8&238&4857&9290&21915\\ \#49P&38.7&3.36&27.5&0.0455&13.1&43.8&215&456\\ \#53P&420&91.7&163&1.07&3.52&65.8&71.3&158\\ \#69P&2235&462&570&3.79&15.5&0.534&0.274&1.99\\ \#73P&42741&7580&6283&298&513&5.05&0.0215&1.01\\ \#91P&10846&8473&5519&392&674&5.86&0.916&0.000922\\ \end{array} \right] \tag{22}\]  
where \(A1-Kxx_{g44}\), \(A1-Kyy_{g44}\), \(A1-Cxx_{g44}\) and \(A1-Cyy_{g44}\) are the matrices of the maximum identification error of the main stiffness coefficient in the x direction, the main stiffness coefficient in the y direction, the main damping coefficient in the x direction and the main damping coefficient in the y direction of #1 to #8 bearings under different last measuring point conditions in the simulation of g4.4 using Algorithm I; the red numbers show the best identification results when the last measuring point is changed. The First Kind of Simulation Based on Algorithm II  
(1) Results of the computational example g4.4. Equations (23)-(30) can be obtained using the computational example g4.4 when the points #14, #29, #33, #49, #53, #69, #73 and #91 points are used as the last measuring point, respectively. It shows the maximum relative errors of each bearing's main coefficients and the maximum absolute value of each bearing's cross-coupled coefficients. The nodes, where the bearings and discs are located, are used as the m + n measuring points. According to the first rows of the matrix in Equations (23)-(30), the identification error of #1 bearing coefficients is the smallest among the eight bearings when #14 point is used. For the identified main coefficients, the maximum relative errors of k1.xx and k1.yy, which are only 6.89 \(\times\) 10\({}^{-7}\)% and 2.13 \(\times\) 10\({}^{-7}\)%, respectively, almost equal zero. Moreover, the maximum relative errors of c1.xx and c1.yy are also almost equal to zero; although, they are bigger than that of k1.xx and k1.yy. They are only 0.0179% and 0.0945%, respectively. While for the cross-coupled coefficients, the identification errors of cross-coupled damping coefficients are bigger than those of cross-coupled stiffness coefficients; although, they are almost equal to zero (the setting value). The maximum absolute values of k1.xy and k1.yx are 0.0945 and 0.135, respectively. The maximum absolute values of c1.xy and c1.yx are 0.0210 and 0.00298, respectively. However, the identification error becomes bigger for some other bearings. For the main stiffness coefficient in the x direction, the biggest of the eight maximum errors, which is 2.67%, occurs at #8 bearing. For the main stiffness coefficient in the y direction, the biggest of the maximum errors occurs at #8 bearing and is 9.53%. While for the four main damping coefficients in the x and y directions, the biggest values of the maximum errors are much bigger. They occur at #8 bearing and are 76,824% and 183,620%, respectively. For the cross-coupled coefficients, the biggest values of the maximum errors, which are 369,059, 325,011, 12,758 and 143,445, occur at #8, #7, #8 and #8 bearing, respectively. By changing the last measuring point to #29, #33, #49, #53, #69, #73 and #91 points, respectively, similar results can be obtained according to the other rows of the matrices in Equations (23)-(30). \[A2-Kxx_{g44}=\left[