## 4 Design and Functional Verification
### Functional Verification  
According to the comprehensive evaluation results of the multi-wing deployment mechanism configuration, configuration (o) is further developed, resulting in the multi-wing deployment mechanism presented in Figure 13. The drive source propels the slider upward along the upper rail, causing the upper, left, and right connecting links to move accordingly. This movement, in turn, drives the upper, left, and right cranks to rotate around the frame, enabling the corresponding folding wings attached to each crank to rotate and unfold.  
To verify the functional feasibility of the designed mechanism, a kinematic simulation analysis is conducted on the multi-wing unfolding mechanism using ADAMS, as depicted in Figure 14. The simulation model depicts how the slider applies an upward driving force to facilitate the unfolding of three sets of folding wings. The motion process of the single-drive, three-folding-wings deployable mechanism is shown in Figure 15. The resulting angular displacements for each wing during the unfolding process are shown in Figure 16.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**No.** & **O1 (max)** & **O10 (min)** & **C1 (max)** & **C7 (min)** & **E1 (max)** & **E10 (min)** \\ \hline \(\eta\) & 0.866 & 0.858 & 0.846 & 0.788 & 0.819 & 0.784 \\ \hline \hline \end{tabular}
\end{table}
Table 7: Dimensional parameters and transmission efficiency of configuration (c).  
Figure 13: Sketch of the multi-wing deployment mechanism.  
The kinematic simulation indicates that the three sets of folding wings can be unfolded simultaneously at different angles using the same slider drive. Therefore, the designed multi-wing unfolding mechanism is deemed feasible.  
As detailed in Figure 17, a prototype of the multi-wing deployment mechanism was fabricated and assembled, informed by the designed parameters, followed by experimental testing. The multi-wing deployment mechanism is made of an aluminum alloy, and the folding wing control surface is made of 3D-printed resin. The multi-wing deployment mechanism is fixed onto the experimental platform. An electric push cylinder serves as the drive source to move the slider upward, thereby facilitating the unfolding of the wings. Targets are attached to the crank connected to the folded wing, and a high-speed camera captures the motion information of the targets, transmitting the data to the data acquisition system. To ensure optimal performance of the high-speed camera, a lighting fixture is arranged to enhance the illumination. The measured changes in the angular displacement of each unfolding wing are presented in Figure 18.  
Figure 16: Kinematic simulation results.  
Figure 14: Simulation model of multi-wing deployment mechanism.  
Figure 15: The motion process of the single-drive, three-wing deployable mechanism.  
The experimental data in Figure 18 demonstrate that the multi-wing deployment mechanism can unfold rapidly in under one second. Additionally, the folding wings operate without interference during the unfolding process, enabling different wings to rotate at varying angles under the same driving force. Although there is a slight discrepancy in the displacement of the left and right folding wings compared to the ideal state, this can be attributed to gaps present during the prototype assembly. Consequently, the multi-wing deployment mechanism designed in this study is deemed feasible.