Table 2 Coding of factors and levels for the first 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

0

10

0

40

5

12

1

50

10

14

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