## 4 Experiment Results
### Experiment Environment  
The process flow in the experimental environment is shown in the Figure 2, and the material demand of the process flows involved in the experiment scenario setting is shown in the Table 2. The material demand shown in the Table 2 is derived from the abstraction and analysis of historical data obtained through our on-site investigation at COMAC Shanghai Aircraft Manufacturing Co., Ltd.  
Due to the management of 22 materials in the scenario, the cooperation among totaling 23 agents, including 22 suppliers and one main manufacturer, is considered in the environment as mentioned in the section Model Assumptions. The parameters of the scenario used in the experiments are shown in Table 3. The information about the network in the model mentioned in our proposed method is shown in Table 4.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Assembling Process** & **Material Category** & **Demand Mean** & **Demand Std** \\ \hline \multirow{3}{*}{assembling the center wing} & structural component & 25 & 2 \\  & system component & 150 & 5 \\  & standard component A & 1500 & 50 \\ \hline \multirow{3}{*}{assembling the center fuselage} & structural component & 50 & 2 \\  & system component & 300 & 5 \\  & standard component B & 2000 & 50 \\ \hline \multirow{3}{*}{assembling the aft fuselage} & structural component & 50 & 2 \\  & system component & 300 & 5 \\  & system component & 300 & 5 \\  & standard component A & 2000 & 50 \\ \hline \multirow{3}{*}{assembling the nose} & structural component & 50 & 2 \\  & system component & 300 & 5 \\  & standard component B & 2000 & 50 \\ \hline \multirow{3}{*}{joining the fuselage} & structural component & 40 & 2 \\  & system component & 500 & 5 \\  & standard component A & 3000 & 50 \\ \hline \multirow{3}{*}{assembling the tailfin} & structural component & 25 & 2 \\  & system component & 150 & 5 \\  & standard component B & 1500 & 50 \\ \hline \multirow{3}{*}{installing the wing stabilizer} & structural component & 25 & 2 \\  & system component & 150 & 5 \\  & standard component A & 1500 & 50 \\ \hline \multirow{3}{*}{joining the entire aircraft} & structural component & 40 & 2 \\  & system component & 100 & 5 \\  & standard component B & 2000 & 50 \\ \hline \multirow{3}{*}{installing system components} & structural component & 25 & 2 \\  & system component & 200 & 5 \\  & standard component A & 1000 & 50 \\ \hline \multirow{3}{*}{installing engines} & structural component & 20 & 2 \\  & system component & 150 & 5 \\ \cline{1-1}  & standard component B & 2000 & 50 \\ \hline \hline \end{tabular}
\end{table}
Table 2: The table of parameters about material demand.  
\begin{table}
\begin{tabular}{c c} \hline \hline
**Parameters** & **Value** \\ \hline number of agents & 23 \\ length of trajectories & 400 \\ number of PPO epoch & 10 \\ learning rate & \(7\times 10^{-4}\) \\ discount factor \(\gamma\) & 0.99 \\ clip \(\epsilon\) & 0.2 \\ clip \(\xi\) & 0.2 \\ clip \(\zeta\) & 0.2 \\ GAE \(\lambda\) & 0.95 \\ KL coefficient \(\alpha\) in \(J(\theta^{i})\) & \(0.0\to 1.0\) \\ KL coefficient \(\beta\) in \(J(\theta^{i})\) & \(1.0\to 0.0\) \\ \hline \hline \end{tabular}
\end{table}
Table 3: The table of parameters about the scenario.