## 4 Discussion  
In this paper, a standardized planting parameter-based approach suitable for the mechanized harvesting of GLVs is methodically proposed. Combined with the requirements of in-soil cutting operation in planting parameters, a reciprocating in-soil cutting device in a GLV orderly harvester is designed, and the structural design and kinematics analyses of the cutting are performed. The field test proves that the cutting device designed in this paper could properly solve the problem that the existing harvester's double-blade cutting device  
Figure 19: Field validation test of the harvester: (**a**) Field test, (**b**) The ridge surface condition after harvester; (**c**) The operation effect of the cutting device, (**d**) The cutting effect of a single GLV. \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**Experimental Factors**} & \multicolumn{3}{c}{**Repeated-Cutting Rate/(\%)**} & \multicolumn{3}{c}{**Miss-Cutting Rate/(\%)**} \\
**Parameter** & **Crank** & **Crank** & **Forward** & **Model** & **Simulation** & **Error** & **Model** & **Simulation** & **Experiment** & **Experiment** \\
**Combination** & **Length** & **Speed** & **/(km/h)** & **Prediction** & **Value** & & **Prediction** & **Value** & **Value** & **Value** & **Error** \\ \hline
1 & 19.8 & 653.333 & 0.547 & 27.297 & 27.472 & \(-0.64\) & 1.796 & 1.646 & 9.11 \\
2 & 19 & 650 & 0.5 & 28.503 & 28.633 & \(-0.45\) & 1.519 & 1.364 & 11.36 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Model prediction results and simulation experiment results. could not carry out the soil operation. Additionally, comparing this with the double-blade cutting device reveals that the proposed approach has the characteristics of simple structure, convenient installation and adjustment, and low processing and trial production cost. This investigation represents a pioneering research work in performing kinematics analysis, cutting rate calculation, and parameter optimization for the reciprocating single-acting cutter with curved teeth. It should be noted that this approach is obviously different from the existing ones developed for examining the reciprocating trapezoidal-teeth double cutter. The design research and optimization analysis method adopted in the present investigation is capable of reducing the cost of device trial production and shortening the test cycle. First of all, the virtual prototype simulation model of the cutting device is constructed based on mechanical system dynamics analysis software in this paper. Through the simulation test, it is observed that the movement trajectories of multiple neighboring markers are almost overlapped, which indicates that the cutting device has repeated cutting in the process of the cutting operation. According to the cutting direction of the cutter edge in reciprocating operation, and the cutting diagram drawing method of the reciprocating trapezoid-teeth moving and fixed double-blade operation of the rice-wheat combine harvester, the drawing method of the cutting diagram and the calculation method of the cutting rate of the reciprocating curved-tooth single-acting cutter operation designed in this paper are established. Three factors affecting the cutting rate of the device are preliminarily determined, which are the forward speed, crank rotation speed, and crank length. Then, combined with the constructed virtual simulation model of the cutting device, the single-factor simulation test and the quadratic regression orthogonal combination simulation test are carried out with the forward speed, crank rotation speed, and crank length as the test factors, while the repeated-cutting rate and the miss-cutting rate are set as the target indexes. The cutting diagram and the bar diagram of the results of the single-factor simulation test are indicative of the fact that the area of repeated cutting increases for very low levels of the forward speed, and the energy consumption of the harvester and plant damage rate also grows.