Table 12 Box-Behnken experiment design and results.
From: Research on coal rock parameter calibration based on discrete element method
Test number | Encoding level | Relative error(%) | |||
|---|---|---|---|---|---|
A | B | C | D | ||
1 | 0 | 0 | 1 | 1 | 24.01 |
2 |  − 1 | 1 | 0 | 0 | 16.47 |
3 |  − 1 |  − 1 | 0 | 0 | 7.21 |
4 | 0 | 1 |  − 1 | 0 | 10.84 |
5 | 1 | 1 | 0 | 0 | 21.05 |
6 | 0 | 1 | 0 |  − 1 | 14.21 |
7 |  − 1 | 0 |  − 1 | 0 | 4.25 |
8 | 1 |  − 1 | 0 | 0 | 9.54 |
9 | 1 | 0 | 0 |  − 1 | 10.81 |
10 | 0 |  − 1 | 0 | 1 | 11.25 |
11 |  − 1 | 0 | 0 | 1 | 16.02 |
12 | 0 |  − 1 |  − 1 | 0 | 3.91 |
13 | 0 | 0 | 0 | 0 | 13.25 |
14 | 1 | 0 | 1 | 0 | 20.14 |
15 | 0 | 0 |  − 1 |  − 1 | 2.91 |
16 | 0 | 1 | 0 | 1 | 23.54 |
17 | 0 | 1 | 1 | 0 | 26.14 |
18 | 0 |  − 1 | 0 |  − 1 | 5.14 |
19 | 0 | 0 | 0 | 0 | 12.84 |
20 | 0 |  − 1 | 1 | 0 | 14.25 |
21 | 0 | 0 |  − 1 | 1 | 10.54 |
22 |  − 1 | 0 | 1 | 0 | 17.25 |
23 | 0 | 0 | 1 |  − 1 | 14.25 |
24 |  − 1 | 0 | 0 |  − 1 | 10.54 |
25 | 0 | 0 | 0 | 0 | 12.08 |
26 | 1 | 0 | 0 | 1 | 17.25 |
27 | 1 | 0 |  − 1 | 0 | 7.09 |
