## 4 Simulation of Seed Discharge Tray Perturbation
### Simulation Results and Analysis  
According to the previous theoretical analysis, it is known that enhancing the initial velocity of the seed population in the seed-filling stage can reduce the value of the negative pressure that needs to be provided by the air chamber under the same working conditions. It reduces the power consumption of the blower and at the same time, facilitates the accurate adsorption of the cabbage seeds by the type of holes. So here, in conjunction with the literature, the fluctuation frequency, average speed, and average kinetic energy of the seed population are chosen as indicators for evaluating the seed-disturbing performance of seed displacement trays. The fluctuation frequency and average speed reflect the overall mobility strength of the population in the seed-filling chamber, and the average kinetic energy reflects the instantaneous mobility strength of the people in the seed-filling section. Figure 8 shows the change of the average speed of the population in 3-10 s when the rotation speed of the seed discharge disk is 40 rpm. From the figure, it can be seen that there is a big difference in the average speed change of the population under the action of different seed disk rotation structures. There is no seed disturbance structure on the plane disk, which mainly relies on the contact friction between the seed disk and the seed to realize the disturbance of the source in the working process. Thus, both the fluctuation frequency and the degree of fluctuation of the seed population under the action of the plane disk is smaller than that under the movement of the circular arc-type serrated disk and the linear-type serrated disk. From Figure 8,, it can be seen that the population's fluctuation frequency under the action of the linear serrated disk is more significant than that under the circular arc serrated disk. From the EDEM post-processing, it was obtained that the average velocity of the population fluctuated between 7.3 \(\times\) 10\({}^{-4}\)-2.1 \(\times\) 10\({}^{-2}\) m/s under the action of the circular arc serrated disk and between 7.0 \(\times\) 10\({}^{-4}\)-2.3 \(\times\) 10\({}^{-2}\) m/s under the movement of the linear serrated disk, a comparison of which showed the degree of fluctuation of the population was more intense under the action of the linear serrated disk. From Figure 9, the average speed of the people under the act of plane disk rotation was 3.89 \(\times\) 10\({}^{-5}\) m/s, the average rate of the population under the action of the circular sawtooth disk rotation was 1.19 \(\times\) 10\({}^{-3}\) m/s, and the average speed of the people under the act of linear sawtooth disk rotation was 1.26 \(\times\) 10\({}^{-3}\) m/s. From this, it can be seen that the population under the action of the linear sawtooth disk was more significant than that under the act of the plane disk and circular sawtooth disk in terms of the frequency of fluctuation, fluctuation degree, and the average speed. It is also greater than the flat disk and the arc-type seed discharge disk. It is quantitatively concluded that the linear serrated disk has the best auxiliary disturbance ability to the seed population in the seed-filling stage, and the seed expeller obtains the best seed-filling performance at this time. \begin{table}
\begin{tabular}{c c c} \hline
**Contact Material** & **Parameter Name** & **Numerical Value** \\ \hline \multirow{3}{*}{Cabbage seed—ABS resin} & coefficient of restitution & 0.75 \\  & coefficient of static friction & 0.30 \\  & coefficient of rolling friction & 0.01 \\ \hline \multirow{3}{*}{Cabbage seeds—stainless steel} & coefficient of restitution & 0.64 \\  & coefficient of static friction & 0.26 \\  & coefficient of rolling friction & 0.05 \\ \hline \multirow{3}{*}{Cabbage seeds—cabbage seeds} & coefficient of restitution & 0.58 \\  & coefficient of static friction & 0.52 \\ \cline{1-1}  & coefficient of rolling friction & 0.01 \\ \hline \end{tabular}
\end{table} 
Table 2: Mechanical parameters of materials used for simulation.