Design and Optimization of Working Parts of Vertical Spiral Ditching Machine Based on Milling Force and BP Neural Network Model

Table 2

Test factor level.

Level	Factor
	(rad/s)	(m)	(m/s)
1	16.33	0.30	0.12
2	18.01	0.32	0.29
3	20.16	0.35	0.46