# Design and Performance Evaluation of a Cherry Tomato Calyx Remover
## 3 Results and Discussion
### Analysis of the Effect of Control Factors on the Removal of Cherry Tomato Calyx
The brush diameter is 1.2 mm as controllable design conditions when removing the circular-shaped cherry tomato calyx. However, through the delta ranking of the removal and damage S/N ratio, the removal S/N ratio damages the brush diameter and length as each priority design factor. Therefore, the optimal design conditions for the cherry tomato calyx remover designed by comparing the removal and damage S/N ratio delta rank are conveyor feed speed of 210 mm/s, brush length of 70 mm, brush clearance of 24 mm, and brush diameter of 1.0 mm. The contribution rate of each design factor affecting the damage rate of circular-shaped cherry tomatoes was 29.21% for conveyor transport speed, 28.04% for brush clearance, 27.81% for brush diameter, and 14.92% for brush length. The difference in the contribution rate between the first, second, and third influence ranks showed a slight difference of 1.17-1.4% (Table 6). The calyx removal S/N ratio was the most influential factor with brush clearance in juibube-shaped cherry tomatoes, followed by the brush diameter, transport velocity, and brush length. Additionally, the transport velocity is 350 mm/s, brush length is 70 mm, brush clearance is 20 mm, and brush diameter is 1.0 mm when the juibube-shaped cherry tomato calyx was removed. The contribution rate of each design factor affecting the removal rate of juibube-shaped cherry tomatoes was the highest at 72.63% for brush clearance, 10.81% for brush diameter, 10.02% for transport velocity, and 6.52% for brush length. The contribution rates of the second, third, and fourth ranks of influence showed a \begin{table}
\begin{tabular}{c c c c c} \hline
**Level** & **Transport Velocity** & **Brush Length** & **Brush Clearance** & **Brush Diameter** \\ \hline
1 & \(-\)21.05 & \(-\)32.18 & \(-\)30.91 & \(-\)23.87 \\
2 & \(-\)27.82 & \(-\)20.80 & \(-\)33.07 & \(-\)35.25 \\
3 & \(-\)36.97 & \(-\)27.46 & \(-\)19.84 & \(-\)21.59 \\ Delta & 15.91 & 11.38 & 13.22 & 13.66 \\ SS & 304.20 & 155.40 & 292.00 & 289.60 \\ Contribution rate & 29.21 & 14.92 & 28.04 & 27.81 \\ Rank & 1 & 4 & 3 & 2 \\ \hline \end{tabular}
\end{table} 
Table 6: Response table for damage S/N ratios of circular-shaped cherry tomato. \begin{table}
\begin{tabular}{c c c c c} \hline
**Level** & **Transport Velocity** & **Brush Length** & **Brush Clearance** & **Brush Diameter** \\ \hline
1 & 19.98 & 26.64 & 22.11 & 16.75 \\
2 & 24.72 & 20.03 & 22.13 & 29.69 \\
3 & 18.17 & 16.19 & 18.62 & 16.42 \\ Delta & 6.54 & 10.45 & 3.51 & 13.27 \\ SS & 68.55 & 167.70 & 24.42 & 343.50 \\ Contribution rate & 11.34 & 27.75 & 4.04 & 56.85 \\ Rank & 3 & 2 & 4 & 1 \\ \hline \end{tabular}
\end{table} 
Table 5: Response table for elimination S/N ratios of circular-shaped cherry tomato. slight difference, and the brush clearance contribution rates were 72.63% and 61.82-66.11%, showing a significant difference (Table 7). Like circular-shaped cherry tomatoes, the damaged S/N ratio increases in proportion to the removed S/N ratio when the calyx of the jujube-shaped cherry tomatoes was removed. Therefore, it is necessary to find an appropriate optimal performance interval by comparing the removal rate and damage S/N ratio. It was analyzed that the damage S/N ratio of jujube cherry tomatoes is the factor that has the most significant influence on brush clearance, and it affects the brush diameter, brush length, and conveyor transport speed. Additionally, like the optimal condition for reducing the damage S/N ratio of circular-shaped cherry tomatoes, it is the optimal condition to minimize the damage S/N ratio when the conveyor transport speed was 210 mm/s, brush length was 80 mm, brush clearance was 24 mm, and brush diameter was 1.2 mm (Table 8). For the removed and damaged S/N ratios of jujube-shaped cherry tomatoes, the first and second places in the delta were identical to the original ones. Therefore, priority was given to the design conditions of the removal S/N ratio, which showed a significant difference in delta values.