Table 2 The Plackett − Burman test parameters.

From: Experimental study on DEM parameters calibration for organic fertilizer by the particle swarm optimization − backpropagation neural networks

NO.

Test parameters

Encoding

Low(-1)

Middle(0)

Hight(+ 1)

CORO−O

Recovery coefficient between organic fertilizer particles and organic fertilizer particles

0.2

0.4

0.6

CORO−p

Recovery coefficient between organic fertilizer particles and PVC plate

0.1

0.45

0.8

COSO−O

Static friction coefficient between organic fertilizer particles and organic fertilizer particles

0.46

0.49

0.52

COSO−p

Static friction coefficient between organic fertilizer particles and PVC plate

0.27

0.30

0.33

CODO−O

Rolling friction coefficient between organic fertilizer particles and organic fertilizer particles

0.36

0.39

0.42

CODO−p

Rolling friction coefficient between organic fertilizer particles and PVC plate

0.16

0.18

0.20

NSCO−O

Normal stiffness coefficient (MN/m3)

1

15.5

30

TSCO−O

Tangential stiffness coefficient (MN/m3)

5

12.5

20

NCSO−O

Normal critical stress (MPa)

0.04

0.07

0.1

TCSO−O

Tangential critical stress (MPa)

0.025

0.053

0.08

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