Table 3 Coding of factors and levels for the second group.

From: Operating parameter optimization and experiment of spiral outer grooved wheel seed metering device based on discrete element method

Coding

Factors

Groove rotation speed

x1 (r/min)

Lead Angle

x2 (°)

Groove number

x3

− 1

30

5

12

0

40

10

14

1

50

15

16

Back to article page