Table 4 Orthogonal rotation combination test coding table.

From: Discrete element simulation optimization design and testing of low-damage flexible drum threshing elements suitable for high-quality seed harvesting

Code

Drum speed z1 (rmp)

Feed rate z2 (kg/s)

Threshing gap z3 (mm)

1.682

500

3

10

1

581.08

3.81

16.08

0

700

5

25

− 1

818.92

6.19

33.92

− 1.682

900

7

40

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