## 5 Case Study
### Construction of the Digital Expression Model of the Pre-Connected Module Interface
For example, the row (\(k\)) in the matrix \(A\) represents the coordinate location of the pre-connected structural component numbered (\(k\)). At the same time, the row (\(k\)) in the matrix \(B\) reflects the acceptable range of the pre-connected structural component numbered (\(k\)). Figure 11: Schematic diagram of the rear interface node network of the front suspension frame module; the node numbers are referred to in Table 2.  
Figure 10: Digital expression model of the front interface of the middle frame module. \[A_{1}=\left( \begin{array}{ccc}x&y&z\end{array} \right) =\left( \begin{array}{ccc}x_{L}&y_{L}&z_{L}\end{array} \right)+\left( \begin{array}{ccc}0&y_{R}&0\end{array} \right)=\left( \begin{array}{ccc}x_{L}&y_{ L}+y_{R}&z_{L}\end{array} \right)\] \[=\left( \begin{array}{ccc}x_{L}&y_{L}+y_{Rmin}&z_{L}\\ \vdots&\vdots&\vdots\\ x_{L}&y_{L}+y_{Rmax}&z_{L}\end{array} \right) \tag{3}\] \[B_{1}=A+\left( \begin{array}{ccc}0&0&z_{R}\end{array} \right)= \left[ \begin{array}{ccc}x_{L}&y_{L}+y_{Rmin}&z_{L}+z_{Rmin}\\ \vdots&\vdots&\vdots\\ x_{L}&y_{L}+y_{Rmax}&z_{L}+z_{Rmax}\end{array} \right]\] (4) \[A=\left[ \begin{array}{c}A_{1}\\ \vdots\\ A_{n}\end{array} \right] B=\left[ \begin{array}{c}B_{1}\\ \vdots\\ B_{n}\end{array} \right] \tag{5}\]  
Confirmation of the Matching Relationship of the Module Connection and Reconfiguration Based on the Connectivity Criteria  
Once the digital expression model for the module interfaces is complete, the connection matching assessment and the reconfiguration of the retrieved module and its pre-connected module are carried out. According to the proposed method, the specific operational steps are as follows:  
1. Retrieve the front suspension frame module: The user's needs are analyzed, and the front suspension frame module that meets the functions and performance requirements is retrieved from the module database. 2. Check and reconfigure the design of the type of module interface: The type of the interface of the front suspension frame module and the interface of the middle frame \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Node**} & \multirow{2}{*}{**Numbering**} & \multirow{2}{*}{**Layerout**} & \multicolumn{3}{c}{**Whether It Is**} & \multicolumn{3}{c}{**Location of Structural Components**} & \multirow{2}{*}{**Relative Acceptable Range of Structural Components**} \\  & & **Direction** & & **Ajostable** & & & & & & & \\ \cline{3-10}  & **Structural** & **y** & **z** & **x** & **y** & **z** & & & & & \\ \cline{3-10}  & **Direction** & **Direction** & **Direction** & **Direction** & **Direction** & & & & & & \\ \hline \multirow{2}{*}{1} & Parallel to the & & & & & & & & & & & \\ \cline{3-10}  & & Y & N & 0 & \(-\)800 & 500 & Direction & \multirow{2}{*}{\(-\)400} & y & \multirow{2}{*}{400} & \multirow{2}{*}{\(-\)25} & \multirow{2}{*}{25} \\  & & & & & & Range value & & & & & & \\ \cline{3-10}  & & Y & N & 0 & 800 & 500 & Direction & \multirow{2}{*}{\(-\)400} & y & \multirow{2}{*}{400} & \multirow{2}{*}{\(-\)25} & \multirow{2}{*}{25} \\  & & & & & Range value & & & & & & \\ \cline{3-10}  & & Y & 0 & 0 & 165 & \multirow{2}{*}{\(-\)1200} & y & \multirow{2}{*}{\(-\)25} & \multirow{2}{*}{25} \\  & & & & & & Range value & & & & & \\ \hline \multirow{2}{*}{4} & Parallel to the & & & & & & & & & & & \\ \cline{3-10}  & & Y & 0 & 0 & 25 & \multirow{2}{*}{\(-\)1200} & y & \multirow{2}{*}{\(-\)25} & \multirow{2}{*}{25} \\  & & & & & & Range value & & & & & \\ \cline{3-10}  & & Y & 0 & 0 & 25 & \multirow{2}{*}{\(-\)1200} & y & \multirow{2}{*}{\(-\)25} & \multirow{2}{*}{25} \\ \cline{3-10}  & & & & & & Range value & & & & & \\ \cline{3-10}  & & & & & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Information for the rear interface of the front suspension frame module (mm). Figure 12: Digital expression model of the rear interface node network of the middle frame module. module is checked.